What Does Dig Do When Welding Using the SMAW Process? A Complete Guide

Introduction: Understanding Dig in the SMAW Process

Shielded Metal Arc Welding (SMAW), better known as stick welding, is one of the oldest, most forgiving arc processes in the trade. A flux-coated electrode carries the current, its coating burns off to shield the molten pool, and the welder feeds the rod by hand. That last detail matters more than most beginners realize, because in SMAW the human hand sets the arc length, and arc length directly drives voltage.

Picture a welder driving a 6010 rod into an open root, arc short and crackling, the puddle pushing through the gap. That aggressive, digging arc is the setting at work. Beginners often meet dig from the other side, as the culprit behind a rod that grabs the plate and refuses to strike, or the mystery knob they never touch. It is one of those settings that separates a fighting arc from a controlled one.

SMAW is a constant current (CC) process. That means the power source holds amperage roughly steady while voltage rises and falls with arc length. Hold a long arc and voltage climbs, spreading heat over a wider area. Push the rod in close and voltage falls, tightening the arc and concentrating heat. Manage that balance poorly and the electrode stutters, sticks, or snuffs out.

This is where dig enters the picture. Dig, also called arc force or arc control, is an adjustable feature that changes how the power source behaves when the arc gets short. When voltage drops below a set point, the machine momentarily boosts output current to keep the arc alive and the puddle fluid. That surge is exactly what stops a rutile or cellulosic electrode from welding itself to the plate. On many machines you can dial the response up or down, so you control how aggressive that boost feels.

The terminology here can trip people up, so it helps to lean on official language. The AWS A3.0 standard defines arc force as a feature of constant-current power sources that temporarily raises output current when arc voltage falls. In plain terms, dig is a controlled, deliberate voltage sag response.

Manufacturers rarely agree on a single name for the same knob. Miller labels it “Dig,” Lincoln Electric often uses “Arc Force,” and other brands call it “Arc Control” or “Dynamics.” Esab, Fronius, and Hobart all have their own spins on the feature, and Hobart’s own guide to SMAW lingo makes the same point. Whatever the badge says, the underlying physics is the same: it is the machine’s response to a short arc.

Dig matters because it solves two everyday problems at once. It fights electrode sticking, the bane of open-root and low-amperage work, and it stabilizes the arc when you dip the rod close to tight fit-ups. That is why dig earns its keep on root passes, vertical-up welds, and any joint where the rod has to stay tight to the metal. Get it right, and welds penetrate cleanly with fewer restarts. Get it wrong, and you fight spatter, undercut, or a rod that welds itself in place.

This guide unpacks dig from the ground up. We cover the science of voltage, current, and arc force; untangle the naming mess between dig, arc force, and arc control; and show how dig shapes penetration, arc stability, and overall weld quality. From there, you will find recommended settings by electrode type, common mistakes and fixes, safety context, and advanced looks at inverters and waveform control.

Whether you are teaching yourself on scrap plate or refining production beads, understanding this one dial will sharpen your stick work fast. If you are still building fundamentals, our guide to welding practice is a smart place to start before you tune the machine. Many of the same arc-control instincts also translate across processes, from TIG polarity choices to wire-feed setups like gasless MIG welding. Dig is small on the panel but huge in the weld.

The Science Behind Dig: Voltage, Current, and Arc Force

At its core, stick welding runs on a constant current (CC) power source. In CC mode the machine holds amperage roughly steady while voltage floats with arc length. Push the electrode closer and the arc shortens, voltage falls, and current creeps upward. Pull away and the opposite happens. That push-and-pull relationship is captured by a volt-ampere (V-A) curve, the graph that describes how any power source behaves as load changes. As the AWS welding handbook explains, reading that curve is the key to understanding every arc control on the front panel.

Open circuit voltage (OCV) is the voltage present before the arc starts, typically 60 to 80 volts on a stick machine. Once the arc is struck, arc voltage drops to roughly 20 to 30 volts depending on arc length and electrode type. The gap between OCV and arc voltage is what lets the machine re-establish the arc after every dip and transfer.

What Happens During a Short Circuit

When molten metal bridges the gap between electrode and workpiece, the arc momentarily disappears and voltage collapses toward zero. Without correction, that short would weld the rod to the plate. This is where dig earns its keep. When voltage drops below a set threshold, dig signals the machine to ramp up current hard and fast, blasting the bridge apart and restoring the arc.

That threshold is the trigger voltage, and the extra amperage is the short-clearing current. Both are temporary. Arc force is a momentary current increase during low-voltage conditions, not a permanent amperage change, so your base heat setting stays where you dialed it.

Droopers vs. Inverters: Two Ways to Get the Same Job Done

Traditional transformer machines are “droopers.” Their V-A curve slopes downward steeply, so when arc length shortens and voltage falls, amperage rises naturally. Old-school welders could bury a 6010 and let the machine’s own droop clear the short. The tradeoff is limited control; the boost is baked into the design.

Inverter machines behave differently. They hold a flatter, steeper V-A curve and keep current more constant, which gives a smoother, more stable arc at normal lengths. There’s a downside, though: with less natural droop, a short can hang on and stick the rod. Dig solves that by mimicking drooper behavior digitally, adding a controlled current boost only when voltage drops. It’s essentially a software stand-in for the physical droop of an old transformer.

Think of the V-A curve as a contract between the machine and the arc. A steeply drooping curve says, “I’ll hand over extra current the moment you short.” A vertical inverter curve says, “I’ll hold steady until told otherwise.” Dig is the clause that lets an inverter add an exception at low voltage without rewriting the whole agreement.

Getting either machine to behave takes practice. Building consistent technique is covered in this guide to welding practice.

Finding the Balance

Short-clearing current is a Goldilocks setting.

• Too little: the short lingers, the rod sticks, and the arc stutters.
• Too much: the bridge explodes violently, throwing large spatter. Welders call this “unloading.”
• Just right: the short clears crisply with a tight crackle and minimal mess.

Those globs of molten metal aren’t just cosmetic; excessive spatter means extra cleanup and can signal you’re running too aggressive a dig setting for the electrode. As welding educator Jody Collier’s team notes in this guide to arc control, the right setting is judged by ear and by watching the puddle, not by a single universal number. For a broader look at how arc characteristics change across processes, see how polarity and current type shape results in TIG welding polarity.

Understand these electrical fundamentals and the dig knob stops being a mystery. It’s simply a controlled response to one specific electrical event: low voltage from a shorted arc.

Dig vs Arc Force vs Arc Control: Terminology and Manufacturer Differences

If you’ve spent any time shopping for a stick welder or reading a manual, you’ve probably noticed that manufacturers can’t seem to agree on what to call the same feature. Miller prints “Dig” on the panel. Lincoln and several other brands call it “Arc Force.” You’ll also see “Arc Control,” “Arc Force/Dig,” and a handful of other variations. This inconsistency confuses a lot of welders, but here’s the reassuring truth: in the context of SMAW, these knobs all do essentially the same job.

The Standard Term: Arc Force

According to AWS A3.0, the Standard Welding Terms and Definitions, the correct technical term for this behavior is arc force. It’s defined as the temporary increase in welding current that a constant-current (CC) power source delivers when arc voltage drops. In plain language, when the arc gets short and the voltage sags, the machine pushes extra amperage to keep the arc alive and prevent the electrode from freezing to the plate.

“Dig” is a nonstandard, colloquial term that became popular largely because of Miller’s front-panel labeling. It describes the same phenomenon. The terminology breakdowns in welding trade publications often note that “dig,” “arc force,” and “arc control” are used interchangeably in everyday shop talk, even though only “arc force” appears in the formal standard.

How Manufacturers Use the Terms

Different brands attach different names, and sometimes slightly different behaviors, to the same core idea:

• Miller: Labels the knob “Dig.” Increasing it makes the arc more forceful at low voltage, which helps with open-root work and 6010 electrodes.
• Lincoln Electric and many others: Use “Arc Force” or sometimes “Arc Control.” The effect is the same, though the factory default and adjustment range can vary.
• Multi-process inverters: Often expose “Arc Force” in a digital menu alongside hot start and anti-stick, sometimes with per-process defaults.

This is why you can’t just copy a setting from a YouTube video and expect it to transfer perfectly. A “5” on one machine may behave like a “3” on another. As the welders on community forums like WeldingWeb frequently point out, the dial’s actual effect depends entirely on the machine’s internal curve design.

Engine-Driven Machines vs Inverters

Here’s where it gets more interesting. On traditional engine-driven machines, such as the classic Lincoln SA series, the “arc force” or “dig” control often manipulates the open-circuit voltage (OCV) and the shape of the volt-amp curve directly. Turn it up and the machine literally runs hotter and stiffer at low arc voltage, because you’re altering how the generator’s excitation and output respond to the arc load.

Inverter-based machines handle it differently. Instead of reshaping a generator’s physical output, the inverter uses fast digital control loops to sense voltage drop and inject current within microseconds. The transition from transformer and engine-driven sources to inverters changed how responsive and precise these adjustments feel. That’s why an inverter’s arc force can feel snappier and more consistent than the same-named control on an old engine drive.

Why This Matters in Practice

Understanding machine-specific behavior is critical. Two welders running identical settings on different machines can get completely different results because the labels don’t standardize the actual response. Before you dial in a root pass or fine-tune a vertical-up joint, read your machine’s manual and test the control’s range on scrap. Consistency in your own setup matters far more than matching someone else’s numbers. If you’re still building fundamentals, a structured approach like this guide to welding practice will help you learn how each control feels on your specific equipment.

The takeaway is simple: dig, arc force, and arc control are three names for one adjustable characteristic. Learn to recognize it whatever the panel says, and you’ll stop being confused by the jargon.

How Dig Affects Penetration, Arc Stability, and Weld Quality

Dig isn’t just a comfort knob you fiddle with when a rod keeps sticking. It reshapes how the arc behaves, and that changes nearly everything about the finished weld: how deep it bites, how the bead sits, how much spatter rains down, and whether you can hold a puddle in a vertical or overhead position. Master these effects and you stop fighting your machine and start working with it.

Penetration and Bead Profile

Turn dig up and the machine boosts short-clearing current the instant arc voltage drops, which happens when you push the rod tight into the joint. That surge creates a stiffer arc with real drive, and a driven arc typically cuts deeper. The payoff is deeper penetration, a more pronounced finger profile, and a bead that ties in aggressively at both toes. In practical terms, dig is the dial that decides whether your arc whispers across the surface or bites into it.

Turn dig down and the arc softens. It wanders less forcefully into the plate and lays a wider, flatter, gentler bead that blends smoothly across the surface. That’s exactly why low-hydrogen electrodes like 7018 run best with a modest dig setting—too much drive on a low-hydrogen rod tends to gouge and leave an undercut-prone bead instead of a clean, stacked one.

Arc Stability and Spatter

A moderate dig keeps the arc lit through those split-second moments when the electrode crowds the puddle. That matters, because it lets you run a tight arc length for better control without the rod freezing to the plate. That tolerance is a big part of why operators describe dig as an anti-stick feature. With too little dig, the arc feels lazy and snuffs out whenever you push in.

Crank dig too high, though, and you pay for it. Excessive dig can cause arc instability, a harsh, raspy crackle, and a shower of spatter that sticks to everything within a foot of the puddle. On thin material or in awkward positions, that aggressive arc becomes genuinely hard to control.

Puddle Fluidity and Out-of-Position Control

Dig also changes how fluid the molten puddle feels. A stiffer, more driven arc shoves the puddle around with force—great for driving metal into a root, terrible when gravity is already tugging it downward. For vertical-up and overhead work, welders often dial dig back just enough to keep the puddle manageable, because a hot, watery puddle invites sagging, excess reinforcement, and defects such as overlap. Building that feel takes deliberate repetition; a structured welding practice routine is the fastest way to train your hand to read the puddle.

Keyhole Behavior and Gap Bridging in Open Roots

In open-root pipe and plate welds, dig is what lets you form and hold a keyhole—that small window of molten metal you push along the root as the arc cuts through. A high-dig, stiff arc, like the one you get from a 6010 or 6011, blasts through the gap, clears it, and leaves a controllable keyhole behind. Because the puddle stays fluid and driven, you can work rod angle and travel speed to keep that keyhole a consistent size, which sets the foundation for full root penetration. When the root gap widens or fit-up is sloppy, that same drive keeps the arc from blowing through and helps bridge the opening by pushing molten metal across it.

The takeaway is simple: dig tunes arc character, it isn’t a brute-force power boost. Match a stiff, penetrating arc to work that demands it, and a soft, stable arc to work that rewards cleanliness and control.

Recommended Dig Settings by Electrode Type and Application

There is no single “correct” dig number that works for every rod, position, and joint. Dig is a fine-tuning control, and the right setting depends on three things: the electrode you’re running, where you’re welding, and how much penetration the joint demands. Treat the guidance below as a starting point, then dial it in on scrap before you touch the actual workpiece.

Dig Settings by Electrode Type

Cellulosic rods (E6010, E6011). These fast-freeze electrodes are the ones that actually reward higher dig. They use a thin flux and a forceful, digging arc to push through open roots and hold control in vertical and overhead work. On most inverters, run dig in the upper half of the range so the arc keeps driving into the puddle instead of stubbing out. The trade-off is more spatter and a rougher, more aggressive arc, which is normal for these rods.

Low-hydrogen rods (E7018, E7018-1). E7018 wants a smoother, more stable arc. Keep dig low to moderate. Crank it up and you’ll fight excess spatter, an unstable transfer, and a puddle that’s harder to read. If you’re running larger sizes like 3/16″, pair a modest dig setting with correct amperage and polarity details from our guide to 3/16 E7018 amperage.

Rutile and general-purpose rods (E6013, E7014). These are forgiving, easy-striking electrodes for light fabrication. Run a low to medium dig. You want a soft, stable arc for clean beads on thinner material, not an aggressive dig that risks burn-through.

Iron-powder drag rods (E7024). Designed for high deposition at high current in flat and horizontal fillets, E7024 is happiest with low dig. It’s a drag rod, so you want a smooth, self-regulating arc rather than a digging one.

Position and Joint Type Change the Recipe

Position matters as much as electrode choice. In flat and horizontal positions, you can usually run lower dig because gravity helps the puddle and you don’t need extra force to control it. As you move to vertical-up and overhead, bump dig up slightly to keep the arc from stubbing and the puddle from sagging.

• Open root joints: reach for higher dig. You need the arc to keyhole and penetrate the root face cleanly, especially with E6010.
• Fillet welds: low to medium dig gives a smoother, more consistent leg and less spatter cleanup.
• Groove welds: match dig to the pass. Roots want bite; fill passes want stability.
• Thin material: keep dig low to avoid blowing through the plate.

Pipe Welding: Root vs. Fill and Cap

Pipe work is where dig earns its keep. On the root pass, a cellulosic rod with higher dig produces the penetration and internal reinforcement inspectors look for. Once the root is in, switch to a low-hydrogen fill and cap and lower the dig. That combination keeps the puddle controllable around the pipe and leaves a clean, uniform cap. The reasoning echoes what you’ll see with other arc processes: matching force to the job, much as described in our polarity for flux core welding breakdown.

Test on Scrap, Then Commit

Before running production or structural work, burn a few test beads. Bump dig up until the rod stops stubbing, then back it off until spatter and arc harshness settle down. That sweet spot is your setting. Building that feel takes repetition, and our welding practice guide is a good companion for structured drills.

Finally, treat dig as one part of a safe setup. Wear proper eye and body protection for the process, as outlined in our protective eyewear guide, and follow the safety guidance from OSHA’s welding safety publication and the servicability and qualification rules in AWS A3.0. Good settings mean nothing without good safety habits.

Common Mistakes, Troubleshooting, and Solutions

Dig is a small knob with big consequences, and most of the trouble welders run into comes from treating it as a set-and-forget dial or, worse, as a stand-in for amperage. Here are the mistakes we see most often, along with fixes that actually work on the bench.

Mistake 1: Maxing Out Dig With 7018

Low-hydrogen electrodes like 7018 transfer metal in a globular mode, and they do not need aggressive arc force. Crank dig to maximum and the extra push slams into the molten droplet during the brief short-circuit clearing phase, causing what many welders call “unloading” spatter. The bead comes out rough, the base plate gets peppered, and you gain nothing. Keep dig modest, typically 20 to 40 percent of the machine’s range, and let the rod work. If you are dialing in a specific rod, our 3/16 E7018 amperage guide covers the settings that matter.

Mistake 2: Confusing Dig With Amperage

This is the most common conceptual error. Dig shapes how the machine reacts to arc-length changes, while amperage controls penetration and deposition rate. The AWS A3.0 standard defines arc force in formal terms, but the practical rule is simple: no amount of dig will turn a cold, underpenetrated weld into a proper one. If the root is not burning in, raise the amperage first and treat dig as a fine-tuning control, not a power booster.

Mistake 3: Too Little Dig and the Electrode Sticks

When the rod freezes to the plate, the instinct is to yank harder. The smarter fix is to look at dig. A slight increase in arc force helps the machine re-strike and clears the short circuit faster. Also check your arc length and amperage: too long an arc and too low a current both make sticking worse. A dirty or loose ground clamp is a frequent hidden culprit. Adjust one variable at a time so you know what actually solved it.

Mistake 4: Blaming Dig for Arc Blow

Magnetic arc blow makes the arc wander, hiss, and sputter, and it can even push the rod into sticking. Those symptoms look like a dig problem, but they are not. The cure is technique and setup: move the work clamp so the current path is balanced, keep the arc short, and angle the rod toward the weld puddle. On long seams, stitch welding or wrapping the lead around the workpiece helps. Adjusting dig while arc blow is active just masks the real issue.

Mistake 5: Forgetting Position and Thickness

Settings that work on flat plate do not transfer to vertical-up or overhead work. Out-of-position welds need a tighter, more controlled puddle, so a lower dig setting helps the puddle freeze faster. On thick, dirty, or rusty base metal, a little extra dig helps the arc bore through surface contamination. Re-check your setting every time the joint changes.

If a weld goes wrong, run through this checklist before touching the dig knob:

Most dig-related defects are preventable once you stop treating the knob as a mystery. The same discipline applies to other processes: judging a weld’s quality honestly is a skill, and our guide to good and bad MIG welds shows how visual cues translate across processes. And if you spot a bead that rolls over at the toes instead of blending in, that is overlap, a defect often linked to exactly the kind of puddle-control problems described above.

Dig in Context: Comparisons, Safety, and Practical Tips

Dig doesn’t exist in a vacuum. It’s one part of how a constant-current (CC) stick machine manages the arc, and understanding how it differs from arc controls in other processes helps you appreciate what it actually does. Once you know the theory, the practical side matters just as much: safe habits and deliberate practice turn a confusing knob into a second-nature tool.

How Dig Compares to Arc Control in Other Processes

SMAW dig is specific to the constant-current (CC) arc response of stick welding, a quirk of the process detailed in Hobart’s SMAW lingo guide. In CC welding, the machine adjusts voltage to hold current steady as arc length changes, and dig determines how aggressively that voltage spikes when the electrode shorts to the puddle. Tick the knob up and the machine pushes more current through the short to clear it fast, which is why 6010 open-root work benefits so much.

Other processes solve the same problem differently:

• GMAW (short-circuit transfer): The power source uses inductance or a “short-circuit response” setting to control how quickly current rises during each short. More inductance softens the pinch and reduces spatter; less makes the arc crisper. It’s a wire-feed control, not an operator arc-length dance.
• FCAW: Flux-cored welding runs on CV (constant voltage) with its own arc-force-like trims on some machines, and polarity matters a lot. If you’re sorting out which lead goes where, see Polarity for Flux Core Welding: DCEN vs DCEP and Gasless MIG Welding: The Complete Guide to Flux-Cored Welding Without Gas.
• TIG: No dig at all. TIG relies on a stable, non-consumable arc where the operator controls heat with a pedal, not a short-clearing boost.

The takeaway: dig is a CC stick tool. When you move to wire or TIG, you’re using different mechanisms to shape the arc.

Safety First: Fumes, Spatter, and Electrical Hazards

Turning up dig means a more aggressive, crackling arc, and that generally means more spatter and fumes. Stick welding already produces significant fume, and the OSHA guidance on welding safety stresses ventilation and fume control. NIOSH recommends capturing fumes at the source, especially with manganese-bearing electrodes.

Don’t skip the basics:

• Eye and face protection: Use the correct shade for the amperage and keep a spare lens handy. Our guide to Protective Eyewear for Welding covers the right shade and fit.
• Ventilation and fume extraction: Weld in a well-ventilated area or use a fume extractor. Never weld galvanized or coated metal without proper protection.
• Electrical safety: Inspect stinger and ground leads, keep them dry, and work on a dry surface. A well-planned welding facility makes this easier.
• PPE: Leather gloves, jacket, and a respirator when fumes warrant it.

Practical Tips for Building Dig Skills

Like any welding skill, dig control comes from repetition with intent. Start with clean scrap and controlled parameters, then change one variable at a time.

1. Set a baseline. Pick a rod and amperage, run beads at dig zero, then step up in increments.
2. Watch the arc. Note how the sound and spatter change as dig rises.
3. Practice on clean scrap. Rust and mill scale add variables that hide the effect.
4. Keep arc length steady. Let dig handle accidental shorts, not sloppy travel.
5. Log your settings. Record rod, amperage, and dig so you can repeat good results.

Structured drills are the fastest route to muscle memory. Our Welding Practice guide walks through exactly how to build those reps. Repeat the drill weekly, and vary rod type once the basics feel natural, so you learn how dig behaves with 6010, 6011, and low-hydrogen rods alike. When you can feel the machine respond as the arc shortens, dig has stopped being a mystery knob and become a tool.

Advanced Considerations: Inverters, Waveform Control, and Modern Power Sources

Walk up to an old transformer stick welder and you’ll find a heavy machine with a dig setting that feels more like a suggestion than a command. Modern inverter power sources tell a very different story. Inside that lightweight box, a microprocessor samples the arc thousands of times per second and adjusts output on the fly, which means dig is no longer a vague “high or low” toggle. It becomes a precise, repeatable value you can dial in and trust.

How Inverters Implement Dig Digitally

An inverter first rectifies incoming AC to DC, then switches it at high frequency through power electronics before stepping it down to welding voltage. Because the output stage is controlled electronically rather than by iron and copper alone, the machine can detect a dip in arc voltage the instant the electrode gets close to the puddle and boost current in response. That responsiveness is the heart of digital dig.

What you gain in practice:

• Repeatability: a dig setting behaves the same on one job as the next, unlike a mechanical tap that can drift with heat.
• Finer adjustment: many inverters split dig across a 0-10 scale instead of three coarse positions.
• Consistent arc starts: the same instant-response circuitry that manages dig also smooths the transition from open-circuit voltage to a live arc.

Brands disagree on names and ranges, so a “5” on one machine may behave like a “7” on another. That is why the manual matters more than the number. Machine documentation is the only reliable map for how far the dig control actually travels and what each increment changes. This is also where reading your welding practice routine helps — you learn your own machine’s language faster by burning rods deliberately.

Hot Start and Anti-Stick: Dig’s Teammates

Dig never works alone on a modern inverter. Hot start and anti-stick are complementary features that improve arc starting and prevent sticking, and together the three form a start-run-finish toolkit.

Hot start briefly pumps extra current at the moment the electrode touches down, warming the rod tip and establishing the arc before settling to your set amperage. Anti-stick does the opposite job at the other end: if the electrode shorts to the workpiece and voltage collapses, the machine cuts current to a trickle so the rod doesn’t fuse itself to the plate. Dig sits between them, shaping how the arc behaves once it’s running and you’re pushing into the joint.

Some welders crank dig up hoping to cure sticking, when anti-stick is the feature designed for it. Others lower dig to fix a rough start they should be solving with hot start. Knowing which knob does what saves a lot of frustration and plenty of ruined 6010 rods. If you’re coming from wire-feed work, it helps to compare how these controls differ from the settings you already know, something covered in guides to MIG and flux-core fundamentals.

Waveform Control and the AWS Context

Waveform-controlled welding is where modern power sources get genuinely interesting. Instead of a simple sine or square wave, inverters can sculpt the output shape to favor penetration, reduce spatter, or stabilize a specific electrode. Much of this technology matured first in TIG and advanced pulsed processes, and the AWS handbook literature continues to document how waveform parameters interact with arc physics.

Here’s the important part for stick welders: even as waveform control evolves, dig remains fundamental for SMAW. Manual welding depends on the operator controlling arc length by hand, and dig is the machine’s way of compensating when the arc length shrinks. No waveform trick removes that need for 6010, 6011, or a tight 7018 root.

That’s also why the inverter conversion trend has reshaped shop floors: lighter machines, tighter control, better efficiency, and more fabricators running modern units. Whatever the box, the rule holds — understand your documentation and your dig setting will do exactly what you ask.

Conclusion: Mastering Dig for Better SMAW Welds

Here’s the short version. Dig — also called arc force or arc control — is the setting that decides how your machine responds when the arc gets short. As voltage drops, dig boosts current to keep the arc lit, the puddle fluid, and the rod from freezing to the plate. Get it right and stick welding feels smooth and controlled: the rod wets in, the toes tie cleanly, and you barely notice you’re managing an arc. Get it wrong and you’re grinding out cold lap or fighting a rod that won’t stop sticking.

The Takeaways That Matter Most

Everything in this guide boils down to a few durable principles:

• Dig is essential for preventing electrode sticking and achieving proper penetration in SMAW.
• Amperage and dig do different jobs. Amperage sets your baseline heat input; dig controls how the arc reacts to short arc lengths.
• There is no universal “best” number. Optimal settings depend on electrode type, welding position, and joint configuration.
• Fast-freeze rods want more dig, low-hydrogen rods want less. Crank it up for 6010 and 6011, ease it back for 7018.

Match Dig to the Electrode, Position, and Joint

Think of dig as one part in a system, not a standalone fix. A 6010 running an open root on pipe needs aggressive dig to drive that keyhole and bite through mill scale. Switch to a 3/16 E7018 on a flat fillet, and that same aggressive setting can whip the puddle and cause undercut or an overlap defect. Position matters too: vertical-up and overhead welds often benefit from a touch more dig, while flat and horizontal welds usually run cleaner with less.

The machine itself also shapes your baseline. If your welder only offers a simple dig knob, you’re adjusting the arc’s short-circuit response. If it layers in hot start and adjustable arc control, you have more tools — but more knobs to keep in balance. Manufacturers use different names for similar ideas, so the practical move is to learn your machine’s lingo and test what each control actually does. Your manual is the fastest way to decode it; a few minutes with the spec sheet saves hours of guessing.

Practice, Test, and Let the Bead Talk

Mastery comes from understanding principles and then practicing on scrap with deliberate adjustments. Don’t chase a magic setting from a forum. Instead, run a coupon, change one variable at a time, and break the weld or cut it to see what actually happened. Mark the numbers on the coupon with a paint marker so future you knows what worked. Cut-and-etch tests tell you more about penetration than any online number ever will. When you’re building those habits, a structured approach to welding practice will get you there faster than random beads.

Safety Still Comes First

No setting matters if you’re not protecting yourself. Stick welding throws sparks, spatter, and intense UV, so keep your helmet, gloves, and protective eyewear in place every time. Arc welding also produces fumes that demand ventilation, a point OSHA emphasizes in its welding safety guidance. Good airflow and a clean work area aren’t optional, and if you’re building a home setup, plan it properly from the start with a guide to setting up a safe welding shop. A few minutes of prep beats a lifetime of “I wish I had.”

So here’s your action plan: pick the right rod, set a sensible amperage, then dial dig to match the job. Start on scrap, tune it in by feel and by cut-and-etch, and keep notes on what works. The welders who produce consistently good beads aren’t lucky — they treat every setting change as a small experiment and learn from the result. Do that, and dig stops being the confusing knob you avoid — it becomes the tool that makes your stick welds strong, clean, and predictable.

FAQs Recap and Practical Next Steps

You’ve traveled a long way from that first confusing knob. Dig, or arc force, is simply your machine’s way of deciding how aggressively to respond when the arc gets short. Crank it up for a forceful, digging arc that resists sticking and drives penetration in open-root work; dial it back for a softer, smoother arc on fill and cap passes. Everything else — the terminology differences between brands, the effect on penetration, and the settings by electrode — flows from that one idea.

Here are the questions we hear most, answered in one place, followed by the steps that turn reading into skill.

Quick Answers to the Most Common Dig Questions

• Does dig increase amperage or voltage? Effectively, it temporarily raises current when arc length shortens, keeping the electrode from freezing to the plate. It’s a dynamic response, not a fixed setting.
• Do I always need dig? No. On smooth-running electrodes like E7018, a low dig setting is often best. For E6010 and E6011 open-root work, higher dig keeps the arc crisp and the puddle controllable.
• Is dig the same as hot start? Not quite. Hot start boosts current only at the instant you strike. Dig acts throughout the weld, whenever the arc shortens.
• Can too much dig hurt? Yes. Excessive arc force can blow through thin material, widen the puddle, and create spatter, so dial it in for the job.

The full science, terminology, and electrode-specific settings live in the earlier sections, so revisit those if a specific number or brand name is nagging you.

Turn Knowledge Into Skill: Your Next Steps

The fastest way to lock in what you’ve learned is deliberate, repetitive practice. Grab scrap plate, set a moderate dig, then weld the same joint three times — once low, once mid, once high — and write down what each felt like. Continued welding practice paired with parameter documentation builds proficiency faster than any single session because you build a personal reference you can trust.

Next, round out the picture around dig. Polarity and process choice shape your arc just as much as arc force does, so understanding TIG welding polarity: DCEN, DCEP, and AC sharpens your instinct for how current and heat behave. If you work with wire feeders, the same logic applies through polarity for flux core welding: DCEN vs DCEP, since the wrong hookup undoes good technique. Welders who move between processes often compare setups, so is flux core the same as MIG? is worth a look when you’re deciding which machine to reach for on the next job.

Safety never takes a back seat to settings. Proper protective eyewear for welding and other PPE, sound ventilation, and a well-planned workspace are non-negotiable before you strike an arc. OSHA’s guidance on welding safety and health and NIOSH’s work on welding fume controls are practical, free references that clarify hazard controls. Building a proper shop from the start pays off, so see how to plan and set up a safe welding space before your next upgrade.

For ongoing education, lean on authoritative sources rather than random forum posts. The American Welding Society maintains technical handbooks and a current AWS A3.0M/A3.0 standard on welding terms that settle terminology debates for good. When you want the manufacturer’s plain-language take, resources like the Hobart Brothers SMAW lingo guide are genuinely useful.

Bringing It All Together

Dig is a small adjustment with an outsized effect. Master it, and sticking electrodes and cold, shallow fusion become predictable problems you can fix rather than mysteries you fight. Combine that with clean polarity habits, honest parameter records, and airtight safety discipline, and you’ll notice your stick welds improve steadily — not by luck, but by design.

Keep your notebook close, keep practicing on scrap, and treat every confusing arc as data. That’s the difference between a welder who guesses and one who knows.

Frequently Asked Questions

What does ‘dig’ mean in SMAW welding?

‘Dig’ (also called arc force or arc control) is a feature on constant-current SMAW power sources that temporarily increases amperage when arc voltage drops due to a short arc length. This boost helps prevent electrode sticking and provides additional drive for penetration.

Is dig the same as amperage?

No. Amperage is the primary heat setting you select for the electrode and thickness. Dig is a temporary current boost that activates only when voltage drops below a threshold (during short arc conditions), not a permanent increase in welding current.

Should I use high or low dig for 7018 electrodes?

Generally, use lower dig settings for E7018. These electrodes have a globular transfer and high short-clearing current can cause excessive spatter. A softer arc with lower dig typically produces cleaner, smoother beads.

What dig setting is best for 6010 or 6011?

Higher dig settings are often preferred for E6010/E6011, especially for open root joints, out-of-position welding, and gap bridging. The increased arc force provides better penetration and helps maintain arc stability during tight arc lengths.

Why does high dig cause more spatter?

When the electrode shorts to the puddle, voltage drops and dig delivers a large short-clearing current. This sudden surge can violently separate molten metal, creating larger spatter (often called ‘unloading’). Lower dig limits this surge.

Does dig work the same on all welders?

No. Older transformer ‘drooper’ machines change the entire V-A curve shape, while inverters use digital controls to provide controlled boost below a trigger voltage. Engine-driven machines may behave differently than plug-in inverters, so always consult your machine manual.

Can dig fix poor technique?

Dig helps compensate for unintentional short arc lengths, but it cannot replace proper technique. Consistent arc length, travel speed, work angle, and correct amperage selection remain essential for quality welds.

What is the difference between dig, arc force, and arc control?

They are functionally the same in SMAW: all refer to temporarily increasing current during low-voltage conditions. ‘Arc force’ is the term used in AWS A3.0, while ‘dig’ and ‘arc control’ are manufacturer/colloquial terms.

Authoritative Sources & Further Reading

• https://pubs.aws.org/Download_PDFS/AWS_A3.0M_A3.0_2025_PV.pdf
• https://www.aws.org/standards-and-publications/codes-and-standards/a30m/
• https://www.thefabricator.com/thewelder/article/arcwelding/smaw-the-lowdown-on-the-lingo
• https://www.hobartbrothers.com/resources/technical-articles/smaw-the-low-down-on-the-lingo/
• https://weldmongerstore.com/blogs/weldingtipsandtricks/arc-control-setting-for-stick-welding
• https://www.weldingweb.com/threads/can-someone-explain-dig.717495/
• https://www.canadianmetalworking.com/canadianfabricatingandwelding/article/welding/inverter-conversion
• https://www.osha.gov/sites/default/files/publications/osha3132.pdf
• https://www.cdc.gov/niosh/docs/2004-146/default.html
• https://www.aws.org/standards-and-publications/handbooks/