Who Invented Welding? A Complete History From Ancient Forge Fires to Modern Arcs

In a workshop with no forge hot enough to heat a plate of steel, a Greek-descended inventor named Nikolay Benardos touched a carbon rod to a battery lead and watched two edges of metal melt into one. That single spark in 1881 did more than fix a broken part — it quietly ended the age of the rivet and gave the modern world its bridges, pipelines, cars, and ships. The story of who invented welding is really the story of how humanity learned to make separate pieces of metal become a single, permanent whole.

The Day Welding Was Invented: A Spark in an 1881 Workshop

Picture a quiet estate workshop at Privolnoe, in what is now southern Ukraine, late 1870s. A Greek-descended inventor named Nikolay Benardos hunches over a battery bank, dragging a thin carbon rod toward a seam between two plates of scrap metal. The rod flares violet-white, spitting light across his face, and the metal beneath it goes soft and liquid. When he pulls the arc away, the two pieces are no longer two pieces. They have become one.

That is the moment the modern answer to an old question begins. So let’s give the answer up front, before the story unfolds:

From Estate Workshop to Paris Demonstration

Benardos had been studying the electric arc for years, working through Moscow, St. Petersburg, and Kineshma, chasing a practical use for a phenomenon that most scientists still treated as a laboratory curiosity. The breakthrough was almost accidental: he noticed that holding the arc against metal for a prolonged period didn’t just scar the surface, it melted the edges together into what he called a monolithic seal. Prolonged arc exposure could fuse metal, not merely damage it.

He took the idea to Paris in 1881 and demonstrated it publicly at the laboratory of the journal Electricité, letting spectators watch steel edges flow into a single continuous bead. The method impressed enough people that Benardos and Olszewski turned it into a formal patent run: filings in France, Britain, Belgium, Germany, Sweden, Russia, and finally the United States. Benardos’s U.S. patent No. 363320, “Process of and Apparatus for Working Metals by Direct Application of the Electric Current,” was granted on May 17, 1887 (source). You can read a fuller account of the carbon arc process itself at Carbon arc welding.

The name he chose tells you how he saw it. Elektrogefest fused “electric” with Hephaestus, the lame smith-god who forged Achilles’ shield in a volcanic forge. Benardos was claiming, quite deliberately, that the arc was the new forge fire.

Why This Mattered: The World Before Welding

To understand why a single spark in a workshop mattered, you have to picture what joining metal looked like the day before. For most of human history there were really only three options:

• Forge welding — heat small pieces in a charcoal fire until they are plastic, then hammer them together. Effective, ancient, and completely dependent on a strong pair of arms.
• Riveting — drill holes, heat rivets, hammer them flat. Strong, but heavy, and every hole is a stress concentration where a crack can start.
• Bolting — practical and reversible, but again limited by fastener size, weight, and the need to drill the base metal.

None of these could turn two thick steel plates into one continuous, watertight, full-strength member. Riveted lap joints added weight to bridges and ships, needed thousands of fasteners installed by hand, and still leaked. The gas industry’s early pipelines were joined by processes that leaked constantly. As the historical record of the period shows, large-scale metal construction was capped by the fastener, not by the imagination of engineers (Welding history, 1800s).

Welding removed that ceiling. For the first time, a seam could be as strong as the plate itself, with no added hardware, no drilled holes, and no weight penalty. That single capability is what eventually made skyscrapers, pressure vessels, transcontinental pipelines, and modern car bodies possible.

What This Article Covers

The rest of this piece follows the full lineage, not just the famous spark. We’ll define what welding actually is (and what it isn’t), walk back through 5,000 years of forge work, examine the science — the electric arc, oxygen, acetylene — that had to exist before Benardos could use it, and profile the inventors themselves. From there: the parallel invention of the oxy-acetylene torch and resistance welding, welding’s explosive role in both world wars, the modern process family tree from stick to laser, the myths and disputes that still circulate about who deserves credit, and where the industry stands today as a mature, multi-billion-dollar global trade.

Benardos didn’t invent every kind of welding — humans had been joining metal with fire and hammer for millennia. What he invented was the first process that could fuse large pieces of metal electrically, on demand, anywhere a battery could be carried. That is the answer to “who invented welding,” and it is only the beginning of the story.

What Welding Actually Means (and What It Does Not)

When most people hear the question, “who invented welding?”, they are not looking for a philosophical answer. They are looking for three things: a date, an inventor, and the process lineage that led to the method in question. Before we can answer any of those points, however, we first need to know exactly what welding is. Without that definition, it becomes far too easy to credit the wrong person, or to lump in methods that were never welding to begin with.

The Core Definition: Coalescence

At its simplest, welding is the act of joining two or more pieces of metal so that they become one continuous piece. The American Welding Society (AWS) defines it as the coalescence of metals produced by heat or pressure, or both. The word “coalescence” is key here, as it means the atoms of the base metals bond together, rather than being held in place by an outside clamp or an adhesive layer. In many fusion processes, a filler metal is also added to help bridge the joint, but the bond itself comes from the base metals fusing together. This is the line that separates welding from its closest relatives, and it is the reason that the carbon arc can be so revolutionary, as it can exceed 3,000°C to melt thick sections of steel that a blacksmith’s fire simply could not.

How It Differs From Soldering, Brazing, Riveting, and Fastening

With the bond defined, the distinctions become much clearer. Soldering uses a filler metal with a melting point far below that of the base metals, and it relies heavily on surface wetting, not the coalescence of the base metals themselves. Brazing works in a similar way, using capillary action to draw a molten filler into the joint, but at a higher temperature than solder. In both cases, the parts being joined remain solid. Riveting and other mechanical fasteners (such as bolts or pins) take an entirely different route, creating a physical interlock or friction to hold parts together. None of these require the base metal to melt or plastically bond at an atomic level, which is precisely why welding creates a continuous, load-bearing path through the metal itself. For an overview of these allied processes, the NIOSH Health and Safety topics for welders, cutters, solderers, and brazers offers a useful, standards-aligned breakdown.

The Four Broad Families of Welding

Rather than a single method, welding is a large family of processes. Most industry sources, including historical surveys from WeldingHistory.org and the AWS Welding Encyclopedia, break them down into four broad categories:

• Forge and solid-state welding: The oldest family. These processes join metals without fully melting the base, often through heat and immense pressure. Blacksmith hammer-welding falls into this category, as do many modern friction and diffusion processes.
• Fusion welding: The family that most people think of. It uses heat (from an arc, a flame, a laser, or an electron beam) to melt the base metals, and often a filler, to form a coalesced pool that solidifies into one piece. Carbon arc welding is a classic example of this, capable of exceeding 3,000°C.
• Resistance welding: Heat is generated by the electrical resistance of the metal as current passes through it, while pressure is applied to forge the bond. These processes are exceptionally fast, which is why they became staples of mass production.
• Brazing and soldering: While technically “allied processes”, not fusion welding, they are often grouped under the broader joining umbrella. As noted above, they do not fuse the base metals, which is why they remain distinct from true welding.

Why This Matters When Asking “Welding Invented”

For readers searching for when welding was invented, this precision is everything. If you count hammer-forge welds, the answer stretches back millennia. If you count true fusion arc welding, the timeline narrows dramatically. It is for this reason that historians focus on the 19th-century breakthroughs, most notably the work of Nikolay Benardos and Stanisław Olszewski, which gave rise to practical arc welding and its lineage of processes that we still use to this day. Keeping that distinction in mind is what allows us to separate myth from fact, and to give credit where it is truly due for the invention of modern welding.

Before the Arc: 5,000 Years of Joining Metal

Ask most people when welding was invented, and they picture a dark shop, a buzzing electrode, and a shower of sparks. But that answer only reaches back to 1881. Metalworkers had been joining metal for thousands of years before anyone struck an electric arc — they simply did it with fire, hammers, and remarkable patience.

According to research published by the National Institutes of Health, welding of metals has origins in prehistory: at least 5,000 years ago, metal was welded by heating and hammering overlapping pieces until they bonded into a single mass. That technique, now called forge welding, is the great-grandfather of every modern process. Chromium, Nickel and Welding — NCBI Bookshelf

The Oldest Joints: Hammer, Heat, and Human Hands

The earliest welders worked with copper, gold, and bronze — metals soft enough to be persuaded into unity by heat and blows. Bronze Age artisans hammered overlapping pieces at red heat until the surfaces blurred together at the boundary. Around 1000 BCE, Egyptian metalworkers were joining copper plates by cold hammering, pressure alone with no furnace at all, and even fashioned wrought-iron tensors, tensioning rods embedded in stone assemblies, proof that iron could be drawn out and put to structural work.

By the Middle Ages, blacksmiths across Europe and Asia had turned fire welding into a genuine craft. A smith heated two pieces of iron in a charcoal forge until they glowed bright yellow, sprinkled a flux of sand or borax to eat away surface scale, laid one piece over the other, and hammered them on the anvil until the surfaces became one. Sword makers, farriers, toolmakers, and hinge smiths relied on this daily. It produced horseshoes, ploughshares, knife blades, and cathedral hardware — but almost nothing large.

Why Forge Welding Never Built a Skyscraper

Forge welding has a fundamental ceiling. It joins metal in a solid state — the pieces never actually melt, they are plasticized and pressed together. That imposes four hard limits:

• Size. A human arm and a hammer deliver only so much force. Only small cross-sections could be bonded, and the smith could only heat short lengths at a time.
• Oxidation. Steel forms scale almost instantly at welding heat. Unless the flux worked perfectly, the oxide layer sat between the two surfaces and blocked bonding.
• No thick plate. There was simply no way to fuse two heavy plates edge-to-edge. Large structures had to be built from many small forged pieces, or not at all.
• No repeatability. The result depended entirely on the smith’s eye, timing, and strength — no two joints were identical, and quality could not be specified in a contract.

So how were boilers, bridges, and ships assembled before 1881? Cold mechanical joints. Hot rivets, bolts, and clinched fastenings held the industrial age together. The first major iron bridge (1779) and the great Victorian structures were riveted assemblies, not welded ones. In fact, riveting remained the principal method of joining metal plates in buildings, bridges, ships and armaments until the late 1930s.

The “Dawn of Science” That Changed Everything: 1700–1875

Historians of welding usually carve the record into five chapters: joining in early cultures (5000 B.C.–1200 A.D.), the dawn of science (1700–1875), the appearance of the major welding processes (1877–1903), welding as a repair method (1903–1919), and welding as a construction method (1919–1951). The American Welding Society historical record

That second chapter matters more than its modest name suggests. During those 175 years, chemistry and physics produced the ingredients welding would need: gases isolated and named, combustion understood as a chemical reaction rather than a mystical release, batteries and generators making continuous electric current practical, and arc lamps demonstrating that electricity could sustain a stable plasma between two conductors. Nothing was joinable yet — but every missing piece was being laid on the workbench.

And the ancient craft never truly died. The forge principle survives wherever pressure and heat bond clean surfaces without melting them. Modern friction stir welding drives a rotating tool into a joint and generates heat purely through friction, forging two aluminum plates together in the solid state — a 1991 process with the same physics as a blacksmith’s hammer. Tool steel is still forge-welded by makers of pattern-welded and damascus blades, often on a power hammer in a shop recognisable to a medieval smith.

The lesson welding’s long childhood teaches is simple and useful: the arc did not solve the problem of joining metal — it solved the problem of joining metal at scale, at temperature, and on demand. The next chapter is about where the heat itself came from.

The Science That Made Welding Possible: Arc, Oxygen, and Acetylene

Nikolay Benardos’ 1881 carbon arc demonstration may have made headlines, but it wasn’t born in a vacuum. The ability to fuse metal permanently was the result of decades of scientific work. Electricity, fuel chemistry and industrial gas production all had to reach maturity before welding could leave the lab and step onto a jobsite.

This timeline is what truly answers how welding came to be. The arc provided the heat, gas chemistry provided a controllable flame, and only after those pieces were in place could someone combine them to create a viable process.

The Electric Arc: 1800 to 1802

It all began with electricity. Between 1800 and 1801, British chemist Sir Humphry Davy demonstrated the electric arc by striking a current between two carbon electrodes connected to a battery. The resulting discharge produced temperatures no furnace of the era could match, proving that electricity alone could melt metal. At the time, however, it was little more than a laboratory curiosity.

In 1802, Russian physicist Vasily Petrov independently demonstrated the arc using a large battery array. He went a step further by proposing practical uses for it, including joining metals together. Historians credit him with sketching the idea of arc welding decades before it could be carried out (American Welding Society historical records). The concept existed, but the technology to hold a steady arc, feed a filler rod and protect a molten puddle simply did not.

Oxy-Hydrogen: Deville’s Blowpipe, 1853

While the arc laid the groundwork for electric welding, a separate branch of chemistry was working towards a flame-based alternative. In 1853, French chemist Henri Sainte-Claire Deville invented the oxygen-hydrogen blowpipe. Originally designed for melting platinum and producing enamel work, it was finicky, expensive and dangerous. Still, it proved a key point: combining pure oxygen with a fuel gas could create a flame far hotter than any air-fed forge.

That principle would go on to shape the entire oxy-fuel industry, but it needed the right fuel to become truly practical.

Acetylene: From Lab Accident to Fuel Gas

The fuel that would fill that gap took nearly three decades to be recognized. In 1836, British chemist Edmund Davy produced acetylene while researching alkali metals, but no practical use was found for it at the time. In 1862, French chemist Marcellin Berthelot determined its correct molecular formula, C₂H₂, and demonstrated its high reactivity with oxygen. Later, German chemist Friedrich Wöhler showed that acetylene could be produced by dripping water onto calcium carbide, a reaction that would power the gas welding industry for years to come.

Building on these findings, German chemist Henri-Louis LeChatelier studied oxy-acetylene combustion and mapped how oxygen-to-fuel ratios affected flame temperature. Together, these discoveries made the oxy-acetylene torch possible: a portable flame reaching roughly 3,100°C, hot enough to both cut and weld steel.

Bottled Oxygen: The Last Piece, Around 1895

Even the hottest torch is useless without a reliable supply of pure oxygen. That supply did not exist commercially until around 1895, when air-liquefaction plants began producing bottled oxygen at an industrial scale. As the welding history records for 1900 and beyond show, this single advancement is what turned gas welding from a chemist’s demonstration into a tradesman’s tool.

How the Discoveries Converged

The arc provided the means to melt metal with electricity. The gas chemists provided a flame hot enough to do the same without a battery array. And the rise of bottled oxygen gave welders the portability to take both to a jobsite. Benardos’ contribution in 1881 was not inventing the arc, but combining these scientific building blocks to prove that it could permanently fuse two pieces of metal.

This lineage is well-documented, and as the historical scholarship on welding technology makes clear, those attributions matter far more than any single name. The science had to come first for welding to become a reality.

Nikolay Benardos and Stanisław Olszewski: The Inventors of Arc Welding

Ask ten people who invented arc welding and you will get ten confident answers, because the honest truth is that credit here is layered rather than clean. The name most attached to it is Nikolay Benardos, a Ukrainian inventor of Greek descent who lived from 1842 to 1905. But the story only makes sense once you meet his partner, Stanisław Olszewski, and the two earlier experimenters who touched the arc before either of them.

Benardos: The Man Who Stared at an Arc Too Long

Benardos was a restless, self-funded experimenter who spent years investigating the electric arc across Moscow, St. Petersburg, and Kineshma. He was not initially trying to join metal. He was trying to make bright, usable light — carbon arc lamps were the era’s street lighting experiment. Working with a battery-powered arc, he noticed something he had not planned: when the arc stayed on a piece of metal long enough, the edges didn’t just glow, they melted together and fused into a single continuous mass, a monolithic seal that could not be pulled apart without tearing the parent metal.

That accidental observation is the moment arc welding becomes technically real. According to Benardos’s own account, repeated exposure to the arc produced a bond stronger than the surrounding material. He pivoted from lighting to joining, and the modern process was born in a workshop rather than a laboratory.

Olszewski: The Engineer With the Patent Money

Inventors without backers produce journals, not patents. In 1885 Benardos struck a sponsorship agreement with Polish engineer Stanisław Olszewski, who put up the money and legal muscle to protect the method internationally. The pair filed in France first — patent No. 171596, granted October 10, 1885 — then ran a remarkable patent campaign through 1886 and 1887 covering Britain, Belgium, Germany, Sweden, Russia, and the United States. They branded the system “Elektrogefest.”

The Two Men Who Got There First

Honest history has to give credit backwards. Two earlier documented efforts sit ahead of Benardos:

• Henry Wilde, 1866. The Englishman patented a method titled “Producing and applying electricity” in Britain, and welding historians at times call this the first arc-welding-related patent — nearly two decades before Benardos’s experiments.
• Auguste de Meritens, 1881. Working at the National Electric Lamp Works in Paris, de Meritens used the electric arc to fuse lead accumulator plates. It is widely regarded as the first fully documented application of the arc for welding purposes.

Neither man built a complete, commercially viable process the way Benardos and Olszewski did. Wilde’s patent was about electricity generation as much as joining, and de Meritens solved a narrow battery-manufacturing problem. What made the 1885 patent historically decisive was that it described a system: controlled arc, clamped workpiece, filler handling, portable apparatus, and a reproducible method that anyone could build and operate.

So Who Really Invented Welding?

The nuanced answer, and the one supported by the record, has three layers:

1. Arc joining — demonstrated by de Meritens in 1881 and conceptually patented by Wilde in 1866.
2. Arc welding as a documented, patented process — Benardos and Olszewski, 1885–1887.
3. Welding as a broader craft — thousands of unnamed smiths reaching back five millennia.

If someone asks “who invented welding” and expects one name, Benardos is the defensible answer for arc welding specifically, with Olszewski as the co-inventor whose fingerprints are on the legal and commercial framework. De Meritens and Wilde deserve credit as precursors, not competitors.

Why the Attribution Still Matters

Citing this history correctly sounds academic, but it changes how you read the industry today. The gap between de Meritens’s 1881 battery experiment and Benardos’s 1885 patent was only four years, yet it took that gap to turn a lab curiosity into something a shipyard could buy. The same pattern repeats later with gas welding and resistance welding, which we will cover next. Discoveries are rarely the hard part; packaging them into a repeatable, protectable, sellable process is where inventors become history.

Note: When you cite welding’s origins in professional content, name the year, the patent, and the country. “Benardos and Olszewski patented carbon arc welding in France in 1885” is verifiable. “Welding was invented in the 1880s” is vague enough to be challenged — and skeptical readers always check.

The Second Invention: Oxy-Acetylene Torch and Resistance Welding

Benardos gave the world an electric way to melt metal together. But almost as soon as his carbon arc patents spread across Europe, inventors on two other fronts were racing toward the same goal by completely different routes. One group asked a simple question: instead of an electric arc, what if we made a flame hot enough to melt steel? Another asked something stranger: what if we used no flame at all, and simply forced electricity through the metal until the joint glowed white-hot?

Within roughly twenty years of Benardos’s 1881 spark, three major joining technologies were in development. That is why historians of welding rarely credit a single inventor. There was not one invention. There was a wave.

Thomas Fletcher and the Blowpipe That Could Melt Steel

The gas-welding story starts in England with Thomas Fletcher, an engineer who reasoned that if a mixture of oxygen and fuel gas could cut through metal, the same heat, carefully controlled, ought to be able to join it. Fletcher built blowpipes burning hydrogen or coal gas with oxygen and demonstrated that a torch flame could fuse metal edges together. His work in the 1880s and 1890s proved the concept, but the flame was still limited. Hydrogen and coal gas simply did not burn hot enough to make steel welding routine and reliable.

The missing ingredient was acetylene. The gas had been discovered back in 1836 by Edmund Davy, and its correct chemical formula, C₂H₂, was worked out by Marcellin Berthelot in 1862. For decades it remained a laboratory curiosity, expensive to make and dangerous to store. That changed when Friedrich Wöhler showed it could be produced from calcium carbide, and by the early 1900s carbide-fed acetylene generators were common in workshops for lighting and cutting.

Fouch and Picard: The Oxy-Acetylene Torch, Around 1903

The breakthrough came in Paris. Working around 1903, French engineers Edmond Fouch and Charles Picard developed a torch that burned acetylene with pure oxygen rather than ordinary air. The difference was dramatic. Preheating the mixture and feeding it through a two-hose torch pushed flame temperatures above 3,000°C, hot enough to melt steel cleanly and quickly. Their design is the direct ancestor of the oxy-fuel torches still hanging on workshop racks today, with the familiar twin-hose setup of fuel and oxygen regulators.

Commercial oxy-acetylene welding followed fast, spreading through Europe and North America by the 1910s. For the first time, a welder could join thick sections with a portable flame, no heavy generator or battery bank required. You can follow the full timeline in the American Welding Society’s welding history records for the 1900s.

Elihu Thomson’s Resistance Welding: Heat From the Metal Itself

Meanwhile, in the United States, a different idea was taking shape. Elihu Thomson, one of the great electrical inventors of the age, discovered that passing a large electric current through two overlapping metal pieces created intense heat exactly at the contact point, because electrical resistance is highest where the surfaces touch. Clamp two sheets between copper electrodes, squeeze them, hit them with current, and they fuse at the interface without any arc, flame, or filler metal.

Thomson patented his low-pressure resistance welding machine in the mid-1880s, around 1885 to 1886, and the process was initially called incandescent welding. His machines produced a characteristic expulsion of sparks as the joint formed, which made early demonstrations almost theatrical. More importantly, the process was fast, repeatable, and easily mechanized.

Why the Automobile Made Resistance Welding a Cornerstone

Thomson could hardly have picked a better moment to invent. When automobile manufacturing moved from hand-built carriages to assembly lines, factories needed to join hundreds of thin steel panels per car, quickly and with minimal skilled labor. Spot welding and seam welding, both resistance processes, delivered exactly that. A pedestal welder could place a spot weld in a fraction of a second, and dozens could be chained along a production line. Resistance welding became a cornerstone of mass production, and a typical car body still contains several thousand spot welds.

Hans Goldschmidt and Thermit Welding, 1895

A fourth path opened in Essen, Germany, where chemist Hans Goldschmidt developed Thermit welding in 1895. Thermit is an exothermic reaction between aluminum powder and a metal oxide, usually iron oxide. Ignited, it burns at well above 2,000°C and produces molten iron, with the aluminum taking the place of the iron in the oxide. Goldschmidt originally patented the process for refining metals, but engineers realized the superheated molten iron could be poured into a mold around two railroad rail ends, fusing them into one continuous rail. Thermit welding remains the standard method for joining heavy rail in the field, where an arc welder or resistance machine cannot handle the mass.

Why So Many Inventions at Nearly the Same Moment?

Gas welding, resistance welding, and Thermit all arrived within about twenty years of arc welding. The answer is convergence. By the 1880s, three enabling technologies matured at once:

• Electrical science — the arc had been studied since Humphry Davy’s demonstrations in 1800, and generating currents was now routine.
• Gas chemistry — acetylene, oxygen, and blowpipe concepts all had published research behind them.
• Industrial demand — railways, shipyards, boilers, and soon automobiles needed stronger, cheaper joints than rivets could provide.

When demand, science, and manufacturing capacity all line up, invention stops being a matter of “who” and becomes a matter of “when.” As the AWS 1800s history archive documents, the decades around 1900 produced an explosion of joining processes precisely because industry was finally ready for them.

By 1910, a welder could choose an arc, a flame, a resistance machine, or a Thermit crucible. The next chapter of the story was not invention at all. It was proving, under the pressure of two world wars, that any of these methods could build, not just repair, the modern world.

From Repair Shop to Revolution: Welding in Two World Wars

For its first few decades, welding was mostly a repair tool. It patched broken castings, sealed boiler seams, and saved factories the cost of a replacement part. Then two world wars arrived and forced the industry to answer a question nobody had seriously asked: could you actually build an entire ship, pipeline, or tank out of welded steel? The answer took some brutal trial and error.

World War I: A Government Discovers the Arc

When the United States entered the First World War in 1917, it faced a shipping crisis. German U-boats were sinking Allied tonnage faster than yards could replace it, and most shipbuilders still joined plate steel with rivets — slow, heavy work that demanded thousands of workers per hull. Facing that bottleneck, President Woodrow Wilson established the United States Wartime Welding Committee of the Emergency Fleet Corporation, putting Dr. Comfort Avery Adams, a Harvard engineering professor, in charge of pushing arc welding into shipyard production.

Adams did something more durable than any single wartime weld. On January 3, 1919, he called a meeting of engineers and industry figures to organize a permanent technical society; the group’s constitution was approved on March 27 of that year, and the American Welding Society was born. Almost every standard, certification, and career pathway that welders rely on today traces back to that committee’s wartime work.

The war also produced the first economic proof of scale. Pipelines built during this era showed welded construction beating threaded and fitted assemblies on cost as well as speed. A standout example was a 140-mile, 8-inch crude oil line running from Mexico to Jacksboro, Texas, welded by the Prairie Pipeline Company. Welded joints cost roughly $2.00 each against far pricier fittings, delivering a 35 percent saving across the project — numbers that turned skeptics into customers.

World War II: Liberty Ships and a Brittle Fracture Lesson

Two decades later, welding became the backbone of the Allied buildout. The Liberty ship program welded entire 441-foot cargo hulls in record time — some were assembled in under two weeks — and the Sherman tank’s hull and the naval vessels that crowded every yard relied on arc processes rather than rivets. The 1936 patent on submerged arc welding arrived just in time to handle the thick plate and long continuous seams these designs demanded.

It nearly went wrong. Early welded ships suffered catastrophic brittle fractures: the SS Schenectady split nearly in two at the dock in 1943, and cracks spread through hulls that should have been ductile. Investigation traced the failure to hydrogen embrittlement, where moisture in conventional electrode coatings introduced hydrogen into the weld metal, making it glass-brittle in cold water. The fix was metallurgical: basic low-hydrogen MMA electrodes developed in the early 1940s, which is precisely why low-hydrogen consumables (E7018 and its descendants) remain the default for structural work. The National Academies’ account of the Liberty ship failures remains one of the clearest engineering case studies ever written.

What the Wars Actually Changed

By 1945, three shifts were locked in, and none of them were reversible:

• Welding became primary construction. It moved from patching parts to holding entire structures together, at a scale no riveting crew could match.
• Failure analysis matured. Brittle fractures taught the industry that welding metallurgy — hydrogen control, preheat, electrode chemistry — mattered as much as the arc itself.
• Standards and institutions followed. AWS grew from a wartime committee into the body writing the codes that still govern structural welding, while the historical record of the period is preserved by resources such as the Welding History website’s 1900s timeline.

Wars compressed decades of gradual adoption into a few frantic years. Rivets did not disappear overnight, but after the Liberty ships and the Prairie Pipeline, no one seriously argued that a welded structure was inherently weaker. The repair shop had become a revolution — and the next challenge would be figuring out which welding process to actually use.

The Modern Process Family Tree: SMAW, MIG, TIG, Submerged Arc, and Beyond

The spark Nikolay Benardos created in 1881 took more than half a century to mature into the array of processes fabricators use today. For decades arc welding remained a crude, unpredictable repair method. Only in the 20th century did engineers refine it enough to build skyscrapers, pipelines, warships and aircraft. Every step was driven by the same goal: stronger, cleaner, faster welds with less waste.

Manual Metal Arc Welding (SMAW)

The biggest leap came from a small change: the coated electrode. Bare carbon or metal rods absorbed oxygen and nitrogen from the air and produced brittle welds. As documented by The Welding History Project, American inventor Reuben Smith patented a paper-coated electrode around 1919, laying the groundwork for Shielded Metal Arc Welding (SMAW), better known as stick welding.

By about 1930 the modern coated rod was in place, and the process became known as manual metal arc or shielded metal arc welding. The coating released a shielding gas and a layer of slag that protected the molten puddle from atmospheric contamination. Its simplicity, affordability and portability have let it endure: today it remains one of the most widely taught and used processes in the world.

The Rise of Alternating Current and Atomic Hydrogen

As demand grew, so did the need for cheaper, more efficient power. Engineer C.J. Holslag helped popularize AC welding, which allowed larger, less expensive transformers to replace costly DC generators. That slashed equipment prices and put welding machines into far more workshops.

In the 1930s Nobel laureate Irving Langmuir pushed further with atomic hydrogen welding. Passing hydrogen through an arc between tungsten electrodes produced extremely high temperatures and exceptionally clean, ductile welds. Rarely used in modern fabrication, the process proved that shielding gases could control the arc, an idea that would soon revolutionize the field.

Submerged Arc Welding (SAW)

Speed and automation were the next hurdles. Submerged arc welding, patented in the United States in 1936, buried the arc beneath a blanket of granular flux, shielding it from the air while suppressing sparks, fumes and ultraviolet radiation.

Its high deposition rate and consistent quality suited heavy fabrication. Submerged arc welding was used extensively to manufacture tanks in the final years of World War II, demonstrating that thick plate could be joined at a scale previously unachievable.

Gas-Shielded Precision: TIG and MIG

Inert shielding gases marked the largest refinement for non-ferrous metals. TIG (gas tungsten arc welding), the first successful gas-shielded process, was introduced in 1943 for assembling aluminum and magnesium aircraft frames. A non-consumable tungsten electrode and argon shielding gave welders unmatched precision, albeit at a slower pace.

That precision was soon balanced with speed. MIG, the first gas-shielded process with a consumable metal electrode, was put into use in 1948. Growing from the 1926 wire-feed patent of Hobart and Devers, Gas Metal Arc Welding (GMAW) fed wire continuously, creating longer, cleaner welds with far less downtime. Adding CO2 and other active gases for Metal Active Gas (MAG) welding in the early 1950s cut costs further, solidifying MIG as a staple for production work.

Beyond the Classics: New Frontiers

The latter half of the 20th century branched the family tree even further. Flux-cored arc welding offered the portability of stick with the speed of MIG, while plasma arc welding in the late 1960s allowed far tighter, more concentrated heat control. From the 1970s onward these processes merged with automation, paving the way for robotic welding, and laser welding let fabricators join materials with pinpoint accuracy, minimal distortion and unprecedented repeatability.

A Process For Every Problem

There is no single “best” method. Each process solved a bottleneck its predecessors could not.

From a paper-coated rod to fully robotic laser cells, every modern process stems from the same root: Benardos’ arc. What began as a spark in 1881 has branched into a family of methods able to join just about anything, anywhere, turning welding from a repair-shop curiosity into the backbone of modern industry.

Common Myths, Mistakes, and Disputes About Welding’s Invention

Ask ten people who invented welding and you’ll get ten confident answers, most of them wrong. The truth is messier and far more interesting: no single date or person invented welding. The modern processes emerged over a concentrated window from roughly 1877 to 1903, with arc welding patents filed between 1881 and 1887. If you’re writing about welding’s history, planning a trade-school essay, or just settling a shop-floor argument, it pays to know which claims hold up and which collapse under a little scrutiny.

The Attribution Problem: Benardos, Olszewski, and Everyone Else

The most common dispute is over who gets credit for arc welding. The usual short answer — “Nikolay Benardos in 1881” — is correct but incomplete, and the details matter:

• Benardos alone obtained Russia’s first arc welding patent in 1885.
• Foreign patents issued jointly to Benardos and Polish engineer Stanisław Olszewski, who financed and coordinated the international filings from 1885 to 1887 across France, Britain, Belgium, Germany, Sweden, Russia, and the United States.
• Earlier arc-joining work exists on record: Henry Wilde’s British patent of 1866 and Auguste de Meritens’s 1881 experiment joining lead battery plates with an arc.
• Elihu Thomson developed low-resistance welding independently in 1885–1886, a parallel lineage that leads to resistance welding rather than arc welding.

The historical community has wrestled with this openly. A 1985 session in London marking the centenary of the invention of arc welding featured a paper dedicated specifically to Olszewski’s role as co-owner of the patents, an acknowledgment that the solo-genius story was never the whole story. You can read more on the documented arc-welding record in the Welding History resources covering the 1800s and their companion coverage of the 1900s.

Myth vs. Fact: The Claims That Keep Circulating

Myth: Welding was invented in a single eureka moment.
Fact: Modern welding processes matured across the 1877–1903 period. Arc welding came first, oxy-acetylene torches arrived around 1903, and resistance welding developed alongside both. Welding was an era, not an event.

Myth: Welding was invented for the automobile industry.
Fact: Cars popularized and scaled welding, especially resistance welding in assembly plants, but the processes predate mass automotive production by decades.

Myth: Arc welding is “about 100 years old.”
Fact: As of 2026, arc welding is more than 140 years old, dating from Benardos’s 1881 experiments. This off-by-four-decades error still appears in otherwise reputable copy, and it’s the easiest mistake to fix.

Myth: Welding, brazing, and soldering are basically the same thing.
Fact: Welding fuses the base metals themselves. Brazing and soldering melt a separate filler metal at lower temperatures without melting the base. The distinction comes down to temperature and coalescence — a difference that matters legally and structurally, not just academically. For a rigorous definition, see the NCBI’s occupational welding overview.

Myth: Carbon arc welding is still the industry standard.
Fact: Carbon arc welding was the first arc welding process developed, but it has been displaced in most applications by later variations. It survives in niche cutting and gouging work. Background: carbon arc welding’s history and decline.

Mistakes Hobbyists Make When Citing Welding History

Three errors show up constantly in forums, video scripts, and blog posts:

1. Confusing discovery with commercialization. Benardos demonstrated the arc in 1881, but patents ran 1885–1887, and industrial adoption came later. Dates of demonstration, patent, and widespread use are three different things.
2. Citing a secondary source as primary. Repeating a number without a traceable citation is how myths survive. Anchor claims to peer-reviewed welding history papers, published historical records, or primary biographies such as Kyiv Polytechnic’s profile of Benardos and the documented Benardos biography.
3. Treating one country’s patent as “the” invention. Patents were territorial. What happened in a Russian workshop, a British office, and a Paris laboratory were overlapping claims, not a single global event.

Handled honestly, these disputes don’t weaken the story of welding’s invention. They strengthen it, showing a technology built by patient experimenters, financiers, and competing laboratories rather than a lone genius with a lightning bolt.

Welding Today: Why a 145-Year-Old Invention Still Runs the World

That spark Benardos struck in 1881 never went out. Nearly 145 years later, welding is a multi-billion-dollar global industry and one of the most reliable skilled trades in the United States. The numbers tell a surprisingly clear story.

The Welding Workforce by the Numbers

According to the U.S. Bureau of Labor Statistics Occupational Outlook Handbook, welders, cutters, solderers, and brazers held about 437,700 jobs in 2025, with a median annual wage of $53,750. The BLS projects roughly 40,300 openings each year from 2025 to 2035 — most of them not new jobs, but replacements for workers retiring or leaving the trade.

The American Welding Society puts the picture even more sharply. AWS estimates the U.S. welding workforce at 771,000 professionals in 2024, with more than 157,000 nearing retirement, as detailed in Where Are the Welders? in Welding Digest.

A $27 Billion Industry Still Growing

The market itself keeps expanding. Fortune Business Insights values the global welding market at USD 27.11 billion in 2025, projected to reach USD 40.99 billion by 2034 at a 4.70% CAGR.

Tellingly, arc welding alone held about 55.4% of the market in 2025 — the direct descendant of Benardos’s carbon rod remains the dominant method. Growth is concentrated in Asia-Pacific, with North America and Europe strong in aerospace, automotive, energy, and infrastructure spending.

The Labor Shortage and the Rise of the Robot

The retirement wave has created a genuine skills gap. Employers across shipbuilding, pipeline, and construction report difficulty filling certified positions, which is pushing the industry in two directions at once: better training and apprenticeship pipelines, and increased automation. Robotic and collaborative welding cells now handle repetitive production work, while human welders move toward the harder jobs — positional, field, and high-specification work where a robot still struggles.

Automation hasn’t replaced the welder so much as raised the floor. A welder who can program, maintain, and troubleshoot a cell is worth far more than one who only runs beads.

Safety and Standards: The Quiet Infrastructure

None of this would be trusted without standards. AWS’s D1.1 Structural Welding Code, now in its decade-spanning lineage of revisions, remains the reference for steel construction in the U.S., alongside AWS certification programs and OSHA’s welding, cutting, and brazing standards covering ventilation, fire watch, and electrical safety. The fume, arc-flash, and hydrogen-embrittlement lessons learned the hard way in the 1940s are now written into code.

Three Practical Takeaways From Welding’s History

• Choosing a process: Match the method to the material and scale. Forge welding taught us small pieces; arc welding taught us thick plate; oxy-acetylene taught us repair and cutting. The history is really a decision tree.
• Evaluating a career: With 40,300 annual openings, a $53,750 median wage, and 157,000 retirees to replace, welding remains a defensible path — especially for those who stack certifications.
• Writing or citing credibly: Go to primary sources. The 1800s and 1900s AWS historical records, the original Benardos patent documentation, and the Journal of the AWS archives beat a dozen recycled blog posts.

Strip away the statistics and the story ends where it began: two pieces of metal, becoming one. In 1881, a Greek-descended inventor in a quiet workshop touched carbon to current and changed what structures could exist. Today, that same principle holds up skyscrapers, welds rail joints in the middle of the night, and seals hulls that cross oceans. The fire never went out. It just got better controlled — and there is still a shortage of hands to hold the torch.

Frequently Asked Questions

Who invented welding and in what year?

Nikolay Benardos and Stanisław Olszewski invented the first practical arc welding process in 1881-1882, naming it Elektrogefest and patenting it in France in 1885 and the United States in 1887. Earlier documented arc-joining work by Henry Wilde (1866 patent) and Auguste de Meritens (1881) also contributed to the lineage.

Was welding invented before the electric arc was discovered?

No. Forge welding by heat and hammering existed for over 5,000 years, but modern fusion welding required the electric arc, first demonstrated by Humphry Davy around 1800 and studied by Vasily Petrov in 1802. Practical arc welding only followed once generators and electrodes could sustain a stable arc.

What does the name Elektrogefest mean?

Elektrogefest means ‘Electric Hephaestus,’ honoring Hephaestus, the Greek god of fire and metalworking (the Roman equivalent is Vulcan). Benardos chose the name for his carbon arc welding method patented in 1885-1887.

When was oxy-acetylene welding invented?

Edmond Fouch and Charles Picard developed the oxyacetylene torch in Paris around 1903, after Thomas Fletcher built earlier hydrogen and coal-gas blowpipes. Commercial availability of bottled oxygen from about 1895 and calcium carbide acetylene made the process practical.

How did the world wars change welding?

World War I turned welding from a repair technique into a shipbuilding and armament process, prompting Dr. Comfort Avery Adams to found the American Welding Society in 1919. World War II drove mass adoption of shielded metal arc welding, low-hydrogen electrodes, and submerged arc welding for tanks, ships, and airframes.

What is the difference between welding, brazing, and soldering?

Welding fuses the base metals themselves, with or without filler, using heat or pressure. Brazing and soldering join metals with a filler that melts below the base metal’s melting point, so the base metals are never fused.

How big is the welding industry today?

The global welding market was valued at about USD 27.11 billion in 2025 and is projected to reach USD 40.99 billion by 2034. Arc welding accounts for the largest share at roughly 55%, and the U.S. welding workforce is estimated at around 771,000 professionals.

Are there still enough welders for modern demand?

No — a skilled-welder shortage is a recognized industry constraint. AWS-linked estimates project roughly 320,500 new welders needed in the U.S. by 2029, while more than 157,000 experienced welders are approaching retirement.

Which welding process was invented first?

Carbon arc welding was the first arc welding process, developed by Benardos and Olszewski. Resistance welding followed in the 1880s with Elihu Thomson, and oxy-acetylene welding arrived around 1903.

Is welding still based on the same principles invented in the 1880s?

Yes. Modern MIG, TIG, stick, and flux-cored welding still rely on an electric arc melting metal, the core idea Benardos patented. What changed is shielding, wire feed, power sources, and automation — the electrode clamp, ground clamp, and cable layout he and Olszewski designed remain recognizable today.