5/32 E7018 Amperage: Settings, Polarity & Technique

It was a Tuesday afternoon at the fabrication shop, and I still remember the exact moment I swapped my trusty 1/8-inch rods for a 5/32 E7018. We had a heavy structural header beam to weld, the kind the inspector would X-ray, and my little 1/8 rod was taking forever. My foreman, a wiry old welder with forty years under his hood, just handed me a 5/32 rod and said, “Turn the machine up past 170, run it hot, and keep a short arc.” The difference was night and day. The fill went in twice as fast, the bead was smooth and flat, and the X-rays came back clean. Now I want to share everything I know about 5/32 E7018 amperage so you can get the same results the first time around.

If you have ever stood in front of a welder with a fresh can of 5/32 E7018 rods and wondered what amperage to dial in, you have come to the right place. This guide covers the full 5/32 E7018 amperage picture: the exact ranges manufacturers publish, what those numbers mean for each welding position, the polarity you should use, and the technique that turns a decent bead into a certified weld. We will dig into rod storage and hydrogen control too, because with a low-hydrogen electrode like E7018, the amp setting is only half the battle.

The Quick Answer: 5/32 E7018 Amperage at a Glance

Here is the short version, with the numbers you will actually use. For a 5/32-inch E7018 electrode running on DC electrode positive, which is the preferred polarity, the amperage range is roughly 110 to 230 amps. In flat position, most welders settle into the 150 to 190 amp range and find it easiest to control. When you move out of position, drop the amperage by about 15 percent, which puts you around 110 to 165 amps for vertical-up and overhead work. A modern utility welder capable of DC output handles this easily, while old-school AC machines run the same rod a little hotter at the equivalent range.

5/32 E7018 Amperage Quick Reference Table

Those numbers might look wide, and they are, on purpose. Different manufacturers publish slightly different windows for the same rod. Washington Alloy lists 5/32 E7018 at 130 to 200 amps for flat work. Pinnacle Alloys shows 110 to 230 amps with an optimum of 170 amps. Hobart Brothers quotes 125 to 220 amps for its 7018 products with an optimum around 170 to 180 amps. And the Lincoln Electric 7018 AC data shows DC positive at 120 to 185 amps and AC at 130 to 200 amps. Notice how “optimum” keeps landing near 170 amps. That is your anchor point.

Decoding the Name: What “5/32 E7018” Actually Means

Before we tune amps, it helps to know what you are holding. The “5/32” is the diameter of the steel core wire, four millimeters in metric terms. That makes it the middle-large stick in the E7018 lineup, bigger than the 1/8-inch workhorse rod but smaller than the heavy 3/16 and 7/32 production rods. The “E” means it is an electrode for shielded metal arc welding, what most of us call stick welding. The “70” stands for 70,000 pounds per square inch minimum tensile strength in the as-welded deposit, which is why E7018 is the default for structural steel where the print calls out minimum strength. The “18” describes the flux covering, and it carries two pieces of information: the “1” tells you the rod is usable in all positions, and the “8” tells you the covering is a low-hydrogen, iron-powder flux with the characteristics of a “EXX18” classification.

That low-hydrogen covering is the whole personality of this rod. The flux is rich in limestone and other minerals that keep moisture, and therefore hydrogen, out of the weld metal. Hydrogen is the enemy of a sound structural weld because it can cause delayed cracking, sometimes hours after the joint has been completed and even after it has cooled to room temperature. The trade-off for all that crack resistance is that the flux demands careful storage, which we will cover in depth later in this guide.

Because the covering is loaded with iron powder, E7018 melts into a fairly fluid puddle and lays down a smooth, finely rippled bead with a slightly convex face in fillets. The arc is quiet, running with low spatter and medium penetration, and the slag is thick, glassy, and generally easy to chip away. That iron powder also bumps up deposition efficiency, which is exactly why a bigger rod like the 5/32 exists: you trade a little bit of finesse for a lot of speed on the fill passes.

Why the 5/32 Size Exists at All

Welding rod manufacturers sell 5/32 E7018 because heavy structural work demands high deposition rates. A 5/32 rod in flat position deposits roughly 3.8 to 4 pounds of weld metal per hour at optimum settings, versus about 2.6 to 2.9 pounds for a 1/8 rod running at its optimum. When you are filling a deep, wide groove on a bridge girder or a heavy base plate weld, that extra deposition rate is the difference between a few hours of welding and a full day of welding. The 5/32 rod is the fill and cap rod of choice for heavy plate and large structural joints, and it also shines for large horizontal fillet welds where you can drag a lot of metal into the joint.

The flip side is that a bigger rod needs more current to melt properly, and more current means a bigger, hotter, more fluid puddle. That is precisely why position control matters so much with this size. In flat and horizontal work, the puddle is your friend, settling into the joint by gravity. In vertical and overhead work, that same gravity turns against you, so you step the amperage down and adjust your technique, which we will get to in a moment.

The Full 5/32 E7018 Amperage Picture, By the Numbers

Let us take a closer look at the published data so you understand where the 110 to 230 amp window comes from and how to translate it to your own machine. Below is a comparison of what several reputable electrode manufacturers specify for a 5/32 E7018 running in flat position.

Manufacturer Amperage Ranges for 5/32 E7018

Take a minute and notice what all of these data sheets agree on. Every single manufacturer supports DCEP, and nobody recommends DCEN as the primary setting for the standard 7018 rod. The arc is characteristically soft and spatters little when you keep it short, which suits the low-hydrogen chemistry. The voltage figures cluster in the 26 to 31 volt band, which tells you the arc runs a touch on the long side at higher travel speeds only if you let it, and that holding a tight arc is the trick to clean results on this rod.

How Amperage Changes What the Weld Looks Like

Amperage sets the heat input and the burn-off rate of the rod. Too low, and the electrode will not melt fast enough to keep a stable puddle. You will see slag entrapment, porosity from a weak arc, and a bead that sits up like toothpaste because the puddle is not hot enough to flow out flat. Too high, and the rod burns aggressively, spatter increases, the puddle becomes watery and hard to hold on the plate, and you risk undercut along the toes of the weld. The sweet spot is the current where the puddle flows evenly, the slag peels back cleanly, and the toes wash in without undercutting. On 5/32 E7018, that is almost always somewhere in the 150 to 190 amp band for flat welding, and it is worth your time to run a quick test bead on scrap to find your machine’s exact landing zone.

A practical way to spot the right heat: watch the size of the droplet and the sound of the arc. At the right amperage, E7018 crackles steady and even, like bacon frying at a consistent sizzle. If the sound is irregular and the arc is spitting and popping, your current is likely too low or your arc is too long. If it hums loudly with heavy spatter spray, you have gone too hot. Both conditions feel different in the hood, and a few minutes of practice will teach you to recognize them.

Why the Hobart Number Range Looks Different From the Others

You might notice that Hobart’s simplest quick-reference chart shows 110 to 230 amps for 5/32 7018 during AC welding, while its individual data sheets show 125 to 220 amps. Both are correct for different product lines. The broader 110 to 230 range covers the entire family of 7018-style products at AC polarity, where some rods run a little hotter to maintain a stable arc on alternating current. The tighter 125 to 220 figures describe specific products like the 718MC on their optimum settings. None of this changes your practical approach: anchor near 170 amps on DCEP and adjust by feel.

Polarity for 5/32 E7018: DCEP, AC, and Why It Matters

Polarity decides how the arc behaves and where the heat lands, and with E7018 the choice is not arbitrary. The standard recommendation for a 5/32 E7018 is direct current electrode positive, commonly called DCEP, or DC reverse polarity on older machines. In DCEP, the electrode is connected to the positive terminal and the work lead is on the negative terminal. This puts about two-thirds of the arc heat into the base metal and one-third into the electrode, which produces the deep, well-fused root penetration and the smooth, stable arc that E7018 is known for. It also happens to be the polarity that keeps the low-hydrogen covering behaving predictably.

Alternating current, or AC, is the third option. Many of the modern E7018 rods, including the ones marketed as “7018 AC,” are engineered to run well on AC machines, which is a blessing for hobbyists and small shops that own a basic AC tombstone welder. The AC arc is a touch less stable and can spatter a little more than DCEP, but a properly designed AC 7018 runs smoothly and is perfectly acceptable for structural work when it meets the specification. Note that not every E7018 is an AC rod; check the particular product data sheet before you assume.

Direct current electrode negative, or DCEN, is the least common choice. Some manufacturers list it as usable on their AC-capable products, and a few operators use it for thin material to reduce penetration because the heat pattern flips, driving more heat into the electrode and less into the plate. But DCEN is not the standard setup for structural E7018 and will not give you the same penetration profile that most procedures assume. Unless a qualified welding procedure specifically calls for it, run DCEP.

Polarity Comparison Table

One more wrinkle: if you are welding in the field on a generator welder or an engine-driven machine, confirm which terminal is actually positive. Lead markings wear off, and a reversed lead on a DC machine flips you into the wrong polarity without any obvious visual warning until your welds start failing inspection. A cheap polarity tester or a quick arc test on scrap will save you a lot of grief.

Arc Length and Technique for 5/32 E7018

E7018 wants a short arc. Every manufacturer’s data sheet repeats this because the low-hydrogen covering depends on the arc gases shielding the molten pool closely. Hobart describes the ideal arc length as “very short, less than half the diameter of the electrode.” On a 5/32 rod, that means you are holding the rod tip within roughly a sixteenth of an inch of the molten puddle, essentially dragging the coating right at the surface. If you lift the electrode to “see better,” you pump air and moisture into the arc and invite porosity, so resist that urge.

The recommended flat-position technique with E7018 is a slight drag, angling the electrode about 10 to 15 degrees from vertical, tilted in the direction of travel. That backhand drag pushes the puddle and lets the slag float to the top. Some operators use a very light push angle on certain joints, but the drag is the standard taught in structural training. Keep your travel speed steady so the bead width and crown stay consistent; a herky-jerky travel speed is one of the fastest ways to create a wavy, inconsistent bead that draws the inspector’s eye.

Striking and Restriking the Arc

E7018 is a little fussier to start than a 6010 or 6011 because the iron-powder flux does not conduct as readily when it is cold. The best technique is a quick tap or a short scratch, then immediately pull a very short arc, letting the rod heat up. Many welders restrike by tapping the rod right at the leading edge of the crater and moving forward immediately. If you struggle with cold starts, particularly on AC, look for a rod with an “H8” or good restrike rating, and make sure the amperage is at least in the middle of the range. Running the rod too cold is the most common cause of sticking and hard restarts.

Avoid long-arcing to restrike. A long arc on restart causes porosity right at the start of the joint and leaves a nice little inspection flag. Break the arc at the end of a pass with a quick backward-and-lift motion, then restart just ahead of the crater on the next pass and work back into it. This little habit keeps your tie-ins clean and helps the weld pass radiographic testing.

Travel Angle, Work Angle, and Bead Control

Two angles govern your bead: the travel angle, which is the tilt of the electrode fore and aft relative to the direction of travel, and the work angle, which is the tilt side to side relative to the joint. For a flat butt or groove weld, keep the travel angle around 10 to 15 degrees of drag and the work angle square to the joint. For a horizontal fillet, tilt the rod about 45 degrees between the two plates and lead slightly. For a vertical-up weld, hold the rod roughly perpendicular to the plate with a slight upward tilt and use a small weave or a series of quick pauses at the sides to control the puddle.

Remember that a 5/32 rod lays down a wide bead, so your weave amplitude and step distance are larger than with the 1/8 you may be used to. If you try to run a 5/32 rod with the tight manipulations you used on a smaller rod, you will get a narrow, crowned, ropey bead. Give the puddle time to wet out, and use a smooth side-to-side motion that pauses briefly at each edge to let the toes fuse and to prevent undercut.

Welding Positions With 5/32 E7018

E7018 is an all-position rod, and the 5/32 size follows that rule, but the amperage and technique must change as you rotate around the joint. Let us walk through each position.

Flat Position (1G and 1F)

Flat is where the 5/32 E7018 is happiest. Gravity holds the puddle in the joint, you can run the hottest and fastest settings, and deposition rate peaks. Use the full 150 to 190 amp band, drag with a slight backhand angle, and let the iron-powder puddle flow out. For a groove weld you can fill with stringer beads side by side or a slight weave, depending on the width. This is the position where a 5/32 rod clearly beats a 1/8 rod on productivity.

Horizontal Position (2G and 2F)

In horizontal fillets and horizontal groove welds, the challenge is that gravity wants to sag the puddle downward. Drop the amperage a little from your flat setting, keep the arc short, and use a faster travel speed so the puddle freezes before it drips. Hold the work angle around 45 degrees between the vertical and horizontal members for a fillet, with the arc directed slightly more toward the vertical plate because the bottom plate pulls heat away faster. Watch the top toe of the fillet for undercut, and if you see it forming, either slow down slightly or reduce your travel angle.

Vertical Up (3G and 3F)

Vertical-up welding with 5/32 E7018 is the position that humbles beginners. The metal wants to run down the plate, so you must reduce amperage by about 15 percent or more, often landing between 110 and 150 amps, and control the puddle with a deliberate weave. The classic technique is a “Christmas tree” or inverted V weave: move up one side, pause, cross over and pause the other side, then step up in the center. That pause at each side lets the edges fuse while the center cools enough to hold. Keep the arc short and your rod angle perpendicular or tilted slightly upward. Vertical-up gives excellent penetration and bead appearance once you get the rhythm, which is exactly why so many structural procedure tests use it.

Overhead (4G and 4F)

Overhead welding is the mirror image of vertical-up in terms of gravity, except now the puddle wants to rain down on you. Run the same reduced amperage as vertical, keep the arc as short as you can without sticking, and use a slight circular or side-to-side weave to distribute heat and keep the puddle small. Push slightly into the joint to drive penetration and keep the puddle from dropping. A common mistake in overhead is running too long an arc to keep the heat off your hand; that only creates spatter and porosity. Keep the electrode dry, keep the arc tight, and if the puddle gets too heavy, stop and let it cool rather than fighting it.

Multi-Pass and Fill Welding With 5/32 E7018

Here is the real reason the 5/32 rod exists: filling large joints fast. When you weld heavy plate, a deep groove, or a big multi-pass structural T-joint, the root is usually welded with a smaller rod, often a 1/8 E7018 or a cellulosic 6010, and then the fill and cap are laid down with bigger rods. The 5/32 E7018 is the fill workhorse in that sequence. Understanding how to stack passes correctly is what separates a clean, code-quality weld from a sloppy pile of metal.

Bead Sequencing and Staggering

When you fill a groove with multiple passes, each bead should overlap the previous one by about 30 to 50 percent, and the passes should be staggered so the tie-in seams do not stack directly on top of each other. Staggering spreads the heat, reduces distortion, and prevents a line of slag inclusions running straight up through the weld cross section. Clean every pass thoroughly before you run the next one. E7018 slag is usually easy to chip, but a thin residue left in a crevice can create a cold lap that an X-ray will catch.

Weave vs Stringer Beads

For the fill passes, you can use stringer beads, which are straight beads with no weaving, or a slight weave. Stringers are easier to control and give more consistent penetration, and on thick material you simply run more of them to fill the joint. Weaving covers more area per pass and can speed up the fill, but a wide weave at high amperage on a big rod risks slag entrapment at the edges and a wandering puddle. A good compromise is a limited weave, roughly two to three times the rod diameter in width, with definite pauses at the edges. Save the wide weaves for the cap pass, where appearance matters most and the joint is nearly filled.

Managing Heat Input Between Passes

Every pass you lay down adds heat to the base metal, and with a hot, high-deposition 5/32 rod you can build up interpass temperatures quickly. For most carbon steels, keep the interpass temperature under roughly 400 to 450 degrees Fahrenheit unless a procedure says otherwise, and let thick sections cool between passes if they are getting hot. Too much interpass heat can reduce mechanical properties and increase distortion. Your hand on the plate tells you a lot: if you cannot hold your bare hand near the joint for a moment, you may want to wait or work a different area. On high-strength or alloy steels, always follow the qualified procedure’s interpass limits.

Depositing the Cap Pass

The cap is the finished face of the weld, and with a 5/32 rod you can produce a smooth, wide cap if you control your weave and travel speed. Keep the arc short, maintain a consistent weave rhythm, and watch that the fusion line on each side is filled without undercut. A slight weave that pauses at the edges and moves quickly across the center gives the classic stacked, rippled appearance that inspectors like. Do not run the cap too hot or too fast; a hurried cap leaves a rough, convex, undercut-prone face. A slightly lower amperage than your fill passes, run with a steady hand, gives the best cap appearance.

Storage and Rod Ovens: The Hydrogen Control Nobody Skips Twice

If there is one lesson every E7018 welder learns the hard way, it is that this rod is only low-hydrogen when it is dry. The whole reason the 5/32 E7018 covering is designed the way it is, is to keep hydrogen out of the weld. But that same flux acts like a sponge if you leave it sitting in a damp shop overnight. The moisture it absorbs rides into the arc, hydrogen dissolves into the molten weld metal, and then, after the weld cools, that hydrogen can migrate to the heat-affected zone and cause delayed cracking, sometimes days later. On thick sections, high-strength steel, or cold-weather work, this is not a minor issue; it is the difference between a safe structure and a failure.

The fix is straightforward but must be followed consistently. Store your unopened 5/32 E7018 rods in their sealed cans or plastic packaging until you are ready to weld. Once you open a can, you either use it quickly or you keep the rods in a holding oven. A holding oven maintains a temperature of roughly 250 to 300 degrees Fahrenheit to keep the rods dry and ready. Every manufacturer’s data sheet lists these storage temperatures because the low-hydrogen classification depends on it. If a rod has been exposed to the atmosphere for a long period, it can be reconditioned by baking: place it in an oven at 250 degrees Fahrenheit and slowly bring it up to about 600 degrees Fahrenheit, then hold it at 600 for roughly an hour to drive off the absorbed moisture.

Recommended Storage and Reconditioning Temperatures

Keeping Rods Dry in the Field

On a jobsite without power for ovens, you have a few options. Portable rod ovens run on mains power where available. Some crews use insulated quivers or heated holders to keep a working supply warm through a shift, pulling rods from a sealed can only as needed. When the weather is cold or humid, the risk of moisture pickup climbs, so limit how many rods you expose at once and keep the rest sealed. A simple rule: if the rod has been out of the oven or the sealed can for more than a couple of hours in a humid environment, treat it as suspect and either rebake it or set it aside for non-critical work. The people who take hydrogen control seriously are the ones whose welds pass and stay sound for decades.

There is also an important reading on the products themselves. Many 5/32 E7018 rods carry an “H8,” “H4,” or “H4R” suffix, which describes the diffusible hydrogen level in milliliters per hundred grams of weld metal and, in the case of the “R” suffix, moisture resistance of the coating. Hobart’s 718MC, for instance, meets E7018 H4R, meaning it produces no more than 4 milliliters per hundred grams of diffusible hydrogen when properly handled, and the “R” indicates it resists moisture pickup for a period even without an oven. If you are working a critical joint, choose a rod with a low hydrogen designation and back it up with a real storage plan. To understand how hydrogen and weld quality fit into a broader safe shop setup, see our guide on how to plan and set up a safe welding shop.

5/32 vs 3/32 vs 1/8 E7018: When to Reach for Which

The 5/32 rod is not always the right choice. Each diameter has a job it does best, and experienced welders keep several sizes on hand, switching as the work dictates. Here is how the common E7018 sizes compare.

Size Comparison Table

The 3/32 rod is the finesse size. It runs cool, fits into narrow joints, and gives you the control you want on thin material, small fillets, and difficult out-of-position work. It is also a great root-pass rod on pipe and plate where a smaller puddle helps you avoid burn-through. If you are welding sheet metal or thin-wall tube, this is your rod.

The 1/8 rod is the jack of all trades. It handles everything from short structural welds to repair work, runs comfortably on a wide range of machines, and is the size most home welders learn on. If you only keep one E7018 size in the shop, it will be the 1/8.

The 5/32 rod is the production fill machine. It lays down nearly twice the metal per hour of a 3/32 rod, which is why it dominates the fill passes on heavy structural joints. Choose it when you have a deep groove to fill, a large fillet to run, or a lot of weld metal to deposit in flat or horizontal position, and when your machine can deliver the 150-plus amps it needs to run well.

The 3/16 and larger rods go even further, but they demand serious current and are really flat and horizontal position friends only. They are strictly for heavy production where the base metal is thick enough to absorb the heat. To see how the amperage picture shifts for a neighboring size, our breakdown of 3/16 E7018 amperage, settings, and polarity makes a useful companion to this article.

Common Mistakes With 5/32 E7018 and How to Fix Them

Most problems with this rod trace back to a handful of repeatable errors. Here is what to watch for and how to correct each one.

Running Too Cold

The single most common mistake is running the 5/32 rod too low on amperage. At low current the rod stubs out, the arc is weak and sputtery, the puddle is sluggish, and you get a high-crowned bead with cold-lap fusion defects and slag that is hard to remove. If the rod keeps sticking and the bead sits up like a rope, turn the amps up. On a 5/32 E7018, that usually means climbing toward 160 to 180 amps for flat work.

Running Too Hot

The opposite error shows up as a watery, hard-to-manage puddle, heavy spatter, and undercut at the toes. If the puddle is running away from you and the bead edges are washing out, back the amps down. Overshooting the current also flattens the bead profile and can increase the risk of burn-through on thinner sections, so find the balance rather than maxing the dial.

Long Arcing

E7018 punishes a long arc more than almost any other rod. Lifting the electrode to see better pulls in air and moisture, and because this is a low-hydrogen rod, that moisture defeats the whole point of the classification. The result is porosity and a rough surface. Keep the arc at half the electrode diameter or less, drag the coating close to the puddle, and let the slag shield do its job.

Letting Rods Get Damp

Leaving 5/32 E7018 rods out in a humid shop, on a cold floor, or in an open can overnight introduces moisture and invites porosity and under-bead cracking. Use a rod oven or keep the rods in sealed packaging, and rebake any rod that has been exposed too long.

Wrong Polarity

Connecting the leads backward on a DC machine reverses your polarity and changes the arc behavior and penetration. The weld may still look acceptable while failing on penetration criteria. Verify polarity on the machine and follow the procedure, and run a test bead whenever you are unsure.

Poor Joint Cleaning Between Passes

Skipping the chipping and brushing between passes traps slag and creates inclusions that show up on radiographs or cause cracking later. Even E7018’s easily removable slag must be removed completely before the next pass. A wire brush and a chipping hammer are not optional on a critical joint.

5/32 E7018 Compared to Other Electrodes

Understanding where E7018 sits relative to other rods helps you choose intelligently. Here is how it stacks up against the common alternatives.

E7018 vs E6010 and E6011

The 6010 and 6011 are cellulosic rods with a forceful, digging arc and deep penetration. They are the classic root-pass rods and prep workhorses, and they handle dirty, rusty, or galvanized steel better than E7018. Their weakness is hydrogen and poor ductility compared with low-hydrogen rods. E7018 produces a much tougher, cleaner deposit with higher tolerance for cracking, which is why structural codes prefer it for fill and cap. Many procedure-qualified welds use 6010 for the root and E7018 for the fill and cap, combining the two strengths.

E7018 vs E7014 and E6013

The 7014 and 6013 are “easy strike” rods with smooth, low-penetration arcs, popular with beginners and on thin material. They are not true low-hydrogen electrodes, so they are not the first choice for critical structural work or thick section welds. E7018 sits well above them in strength and hydrogen control, at the cost of requiring an oven and a bit more technique.

E7018 vs E7024

The 7024 is a high-iron-powder, high-deposition rod with a very fluid puddle and excellent deposition in flat and horizontal positions, but it is not an all-position rod. E7018 trades a little deposition rate for all-position capability and low hydrogen. On heavy flat work where deposition speed rules and positions are easy, a 7024 can outrun a 7018; everywhere else, the 7018 wins on versatility.

E7018 vs E7018M and E7018-1

E7018M is a variant with tighter chemistry and mechanical property limits, designed for stricter requirements, often used where toughness matters. E7018-1 has improved impact toughness at low temperatures, meeting a minimum Charpy value at minus 50 degrees Fahrenheit. Both run on the same basic amperage ranges as standard E7018, so your 5/32 settings carry over, but the mechanical properties differ, and a procedure may specify one over the others. Always match the rod suffix to the job.

Pro Tips for Better 5/32 E7018 Welds

• Anchor near 170 amps on DCEP for flat work, then tune by feel. That number appears as the optimum across multiple manufacturers’ data sheets.
• Keep every rod in an oven. Hydrogen control is the defining feature of this rod, so protect it.
• Use a short arc, always. Think of dragging the flux coating right at the puddle surface.
• Drop 15 percent for out-of-position. Vertical-up and overhead need less heat to keep the puddle controllable.
• Clean between passes. Chip and brush every bead; do not let slag ride into the next pass.
• Stagger your fill passes. Offset the tie-in seams so defects cannot line up through the weld.
• Test on scrap first. A minute of test welding on the same thickness material saves hours of rework.
• Match the procedure. If a WPS calls out polarity, amperage, and rod type, follow it exactly, and keep your electrode box so lot traceability stays intact.

Safety and Protective Equipment

Working with a hot, high-deposition rod like the 5/32 E7018 means more spatter, more arc intensity, and more heat than a smaller rod, so your personal protective equipment matters even more. A proper welding helmet with a shade appropriate for the amperage, typically shade 10 to 13 for the currents this rod runs, protects your eyes and face. For guidance on choosing eye and face protection that meets current standards, see our overview of protective eyewear for welding. Wear leather gloves, a flame-resistant jacket, and if you are welding overhead, a leather cape and sleeves to shed the molten metal.

Ventilation is critical with E7018. The flux produces welding fume, and the gases from high-current arc welding must be controlled. Work in a well-ventilated area or use fume extraction, and follow the exposure limits in the relevant standards. Keep a fire extinguisher handy, keep the work area clear of flammables, and never weld in a confined space without proper ventilation and a helper. For the full regulatory picture, the OSHA welding standard and the ANSI Z49.1 safety standard are the references to know.

Frequently Asked Questions About 5/32 E7018 Amperage

What is the best amperage for 5/32 E7018?

For flat position work, the widely recommended optimum is around 170 amps on DCEP, with an acceptable range of roughly 110 to 230 amps depending on manufacturer and joint. In vertical-up and overhead positions, reduce that by about 15 percent, landing near 110 to 150 amps.

Can you run 5/32 E7018 on AC?

Yes, if the specific rod is rated for AC. Many E7018 electrodes, including dedicated “7018 AC” products, run well on AC machines, typically needing around 130 to 200 amps for the 5/32 size. Check the data sheet for the exact product to confirm AC capability.

What polarity does 5/32 E7018 use?

DCEP, direct current electrode positive, is the preferred and standard polarity. AC is an acceptable alternative for AC-rated rods. DCEN is uncommon and used only for specific thin-material or special procedures.

How many amps for 5/32 E7018 vertical up?

Reduce your flat setting by about 15 percent. If you run 170 amps flat, start around 145 amps vertical-up and adjust down further if the puddle runs too fluidly. Most welders settle between 110 and 150 amps for out-of-position work.

How thick is 5/32 E7018 in millimeters?

Five thirty-seconds of an inch equals four millimeters. It is the fourth size in the common E7018 lineup, after 3/32, and 1/8, and before 3/16, 7/32, and 1/4 inch.

Why does my 5/32 E7018 keep sticking?

Sticking is almost always a sign of too little amperage or too long an arc, especially on cold starts. Increase the current toward the middle of the range and use a quick tap or scratch start, then immediately establish a short arc. Damp rods can also contribute, so check your storage.

Can I use 5/32 E7018 for the root pass?

It is possible on heavy material in flat position, but the 5/32 rod is usually reserved for fill and cap because its large puddle and high heat make burn-through and wandering root beads more likely. Smaller rods like 1/8 or 3/32 E7018, or a cellulosic 6010, are the more common root choices.

How many 5/32 E7018 rods are in a pound?

Roughly nine rods per pound, depending on length. Standard 5/32 electrodes are typically 14 inches long, so a five-pound package holds around forty-five rods.

Wrapping Up: Dialing In Your 5/32 E7018

The 5/32 E7018 is one of the most powerful tools in a stick welder’s kit once you understand its amperage window and its habits. Anchor near 170 amps on DCEP for flat work, drop about 15 percent for out-of-position joints, keep your arc short, and treat the rod’s low-hydrogen coating with the care it demands by storing it properly. Do those things and this rod will reward you with fast fill rates, clean X-ray-quality deposits, and beads that look every bit as good as they weld. Whether you are filling a heavy structural groove or laying a big horizontal fillet, the 5/32 E7018 will carry the load.

Choosing the Right Machine and Dialing In Your Exact Setting

Your welder has a lot to say about where your 5/32 E7018 sweet spot lands. A DC inverter welder with arc-force and hot-start features will run this rod differently from a transformer-based machine or a basic AC tombstone. An inverter’s steady arc and adjustable hot start make restrikes easier and the puddle easier to read, so you may find your optimum sitting comfortably in the lower half of the 150 to 190 band. A transformer machine tends to run a touch softer and may ask you to compensate with a few extra amps and a meticulously short arc. The humble AC machine needs the most current and the most patience, since the arc extinguishes and restrikes sixty times a second in most parts of the world.

Warm up the machine before you fuss with exact numbers. Run a practice bead long enough to bring the equipment and technique up to operating temperature, then start the dial at the midpoint of your position band: roughly 170 amps flat, 145 amps out of position. Lay a test bead on material the same thickness as your job and look at the weld. If the bead is flat, the toes are fused with no undercut, the slag peels freely, and the arc is a steady crackle, you are essentially there. If anything sits off, move the dial in small five-amp steps rather than big jumps, and always watch the visible results rather than trusting the knob alone. A machine’s amperage readout is often accurate, but the joint is a better judge than the dial.

How Base Metal Thickness Changes Your Starting Point

The same rod on different plate thicknesses wants different current. On thick, heavy plate, the base metal soaks up heat and you want to be at the upper part of the range, near 180 to 200 amps, to guarantee fusion into the joint root. On thinner material, the plate cannot absorb heat the same way, so you drop toward the lower end or even below 140 amps to avoid burn-through. The 5/32 rod is fundamentally a heavy-plate tool, and if you find yourself constantly trying to run it cool on thin sheet, you are probably reaching for the wrong size. That is the moment to switch down to a 1/8 or 3/32 rod rather than fight your equipment. Choosing the right rod for the metal is a mark of experience, and few experiences are more telling than watching someone burn a hole through a thin plate with a rod that was always too big.

Heat Input, Distortion, and Welding Sequence

A high-deposition rod like the 5/32 E7018 puts heat into the joint fast, and heat means distortion on a long weld. The classic remedy is not a cooler machine setting but a smarter sequence. Distortion management is partly a matter of how you lay the passes, not just how hot you run them. On a long seam, consider back-stepping, alternating directions between sections, or balancing welds on opposite sides of the weldment so the contractions pull against each other. Clamping stiffens the joint and holds alignment during the weld, and pre-setting the joint to anticipate the shrinkage is a skill the veterans use on pipe and plate alike. When the material allows, welding from the center outward, rather than from one end to the other, spreads the heat and limits bowing.

All that heat also affects the steel’s structure. On carbon steel, keeping interpass temperatures in check preserves the fine grain and the toughness the design assumed. If you are welding lengths of groove continuously at 180 amps with a big weave, you can push the interpass temperature past what the procedure allows before you reach the end of a pass. Stop, check, and let things cool. Patience between passes is cheaper than rework, and rework is far cheaper than a failed test plate. On alloy or quenched-and-tempered steels, obey the qualified procedure’s interpass and heat-input limits without exception, because those materials respond badly to overzealous amperage.

Reading the Weld: What a Good 5/32 E7018 Bead Looks Like

Your eyes and ears are the best instruments you have for fine-tuning amperage, and after a few practice beads the pattern becomes unmistakable. A correctly set 5/32 E7018 produces a bead with gentle, even ripples, a crown that is neither humped nor hollow, and toes that wash smoothly into the base plate without undercut or cold lap. The arc sounds steady and sizzling, and the slag lifts away in a single, clean ribbon after it cools. If the bead looks like a row of stacked dimes, you have the travel speed and amperage in harmony. If the ripples are coarse and uneven, suspect your amperage and travel rhythm together.

When the amperage is too low, the bead crowns up high and narrow, the ripples look muddy, and slag is stubborn. At the high end, the bead flattens out, the toes dig or undercut, and spatter sprinkles the plate around the weld. A long arc adds a rough, frosty surface and porosity in the trail of the slag. Learn to interpret these signs on the surface, because by the time an inspector reads them, the weld’s mechanical fate is already decided below the surface.

When Not to Use 5/32 E7018 At All

An honest guide to amperage should also say when to put the rod down. The 5/32 E7018 is not for thin sheet, light gauge tube, or fine repair work where a cold, controllable puddle matters more than speed. It is not your first choice for positions other than flat and horizontal unless you are comfortable dropping the amps and slowing your rhythm. It should not be used on steel that is visibly rusted, oiled, painted, or wet, because the low-hydrogen coating assumes a clean, dry base metal and degrades fast on contamination. And it should never be used on unknown or hardenable alloy steels without a qualified procedure, because the heat input and hydrogen balance become critical. For those corner cases, a smaller rod, a different classification, or a different process altogether is the professional answer; forcing a 5/32 E7018 into the wrong job costs time and risks the weld.

Authoritative Sources (Outbound References)

• Washington Alloy — E7018 Coated Electrode Technical Data Sheet (amperage, voltage, polarity): https://www.washingtonalloy.com/wp-content/uploads/2020/12/7018-TDS-2020.pdf
• Hobart Brothers — Learn the Basics of Welding: 7018 Welding Rod Amperage: https://www.hobartbrothers.com/resources/technical-articles/7018-welding-rod-amperage
• Hobart Brothers — 718MC Low-Hydrogen Electrode Data Sheet (H4R, operating parameters): https://www.hobartbrothers.com/wp-content/uploads/hobart-catalog/datasheets/Hobart718MC.pdf
• Lincoln Electric — 7018 AC Stick Electrode Catalog Data (AC and DC+ current ranges): https://images.thdstatic.com/catalog/pdfImages/15/1594d9c9-168d-454f-b891-b7e4d3f300c9.pdf
• Pinnacle Alloys — E7018/E7018-1 Data Sheet (amperage, deposition, AWS class): https://www.pinnaclealloys.com/wp/wp-content/uploads/2015/11/E7018-E7018-1-3.18.20.pdf
• AWS A5.1/A5.1M — Specification for Carbon Steel Electrodes for Shielded Metal Arc Welding (electrode classification and storage/drying conditions): https://dl.gasplus.ir/standard-ha/Standard-AWS/AWS-A5.1-A5.1M-2004.pdf
• OSHA — Welding, Cutting, and Brazing, 29 CFR 1910.252 (safety requirements): https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.252
• ESAB — Atom Arc 7018 Low Hydrogen Electrode Information (AWS A5.1/A5.5 classification): https://employees.delta.edu/facilities/_safety-data-sheets/atom-arc-7018-esab-group.pdf