Nothing frustrates a stick weld faster than running the wrong amperage. I’ve watched rods stick to the plate, puddles blow straight through thin steel, and weld beads pile up cold because the machine wasn’t dialed in correctly.
That’s exactly why a reliable Stick Welding Amperage Chart becomes one of the most important references in any welding shop — especially when you’re switching rod sizes, metal thicknesses, or positions during a job.
The tricky part is that amperage isn’t just about getting the rod to burn. Too low, and you’ll fight poor penetration, slag inclusions, and weak fusion.
Too high, and the arc gets aggressive, spatter increases, and the weld can lose control fast.I learned early on that even a small adjustment of 10–15 amps can completely change how a weld feels and performs.
I’ve used amperage charts for everything from light repair work with 6013 rods to heavy structural passes using 7018 and 6010. Having the right settings nearby saves time, reduces wasted rods, and helps produce cleaner, stronger welds without endless trial and error.
I’ll break down the amperage ranges that actually work in real-world welding situations, explain how different electrodes behave, and share practical tips for tuning your machine with confidence. Here’s the chart and setup advice that makes stick welding a whole lot easier.
Image by simpleweld
Why Amperage Matters More Than Most Welders Admit
Amperage is the heat engine in SMAW (Shielded Metal Arc Welding). It determines how quickly the electrode melts, how deep the arc digs into the base metal, and how fluid the puddle becomes. On a typical US inverter or transformer welder like a Miller or Lincoln, you adjust amps directly, but the “feel” comes from experience.
In practice, correct amperage prevents common headaches: excessive distortion on thin mild steel, lack of penetration on thicker plates, rod sticking, and porous welds from unstable arcs.
It also affects your travel speed and overall productivity—especially important when you’re on a deadline or charging by the job.
I’ve seen beginners crank amps way up thinking more heat equals better welds, only to end up with slag inclusions and undercut. Pros know it’s about balance: enough heat for good fusion without cooking the rod or the metal.
Understanding Stick Welding Electrodes and Their Markings
Before jumping into the charts, let’s break down what those numbers on the rod mean. A typical AWS classification like E7018 tells you everything you need:
- E: Electrode
- 70: Minimum tensile strength of 70,000 psi
- 1: All-position capable
- 8: Low-hydrogen potassium coating with iron powder, suitable for AC or DCEP
Different coatings change everything. Cellulosic rods like 6010 and 6011 dig deep and run fast with lots of arc force—great for root passes. Rutile rods like 6013 are forgiving for beginners with easy slag release. Low-hydrogen 7018s produce tough, ductile welds but demand clean metal and proper storage.
Electrode diameter is your starting point for amperage. A good rule of thumb many old-timers use: roughly 40 amps per 1/32″ of rod diameter as a baseline, then adjust for position, material thickness, and joint type.
Stick Welding Amperage Chart by Electrode Type and Size
Here are practical ranges compiled from shop experience and manufacturer guidelines. These are starting points—always test on scrap.
6010 / 6011 (Deep Penetration, Fast-Freezing)
- 3/32″: 40-85 amps
- 1/8″: 75-125 amps
- 5/32″: 110-165 amps
- 3/16″: 140-210 amps
- 1/4″: 210-315 amps
These cellulose rods love DCEP and excel on dirty or rusty metal. Use higher end for flat position, lower for vertical/uphill.
6013 (Easy, Versatile, Beginner-Friendly)
- 1/16″: 20-40 amps
- 3/32″: 40-90 amps
- 1/8″: 80-130 amps
- 5/32″: 105-180 amps
- 3/16″: 150-230 amps
Great for sheet metal and light fabrication. Runs well on AC or DC. Lower amps help prevent burn-through on thin stuff.
7018 (Low-Hydrogen, Structural Strength)
- 3/32″: 65-100 amps
- 1/8″: 110-165 amps (often 90-140 sweet spot)
- 5/32″: 150-220 amps
- 3/16″: 200-275 amps
Keep these rods dry. They run smoother with a slight drag technique. Excellent for critical welds on A36 plate or pressure vessels.
Other Common Rods
- 7014: Similar to 7018 but easier slag, slightly higher amps possible.
- 6012: General purpose, good for bridging gaps.
Adjust down 10-20% for vertical or overhead to control the puddle. Increase slightly for flat or horizontal.
Matching Amperage to Material Thickness
Rod size and amps should roughly match thickness:
- Up to 1/8″ thick: 3/32″ or 1/8″ rods at lower amperage ranges.
- 1/4″ plate: 1/8″ or 5/32″ rods.
- Over 3/8″: Larger rods and higher amps, often multiple passes.
For example, on 1/4″ mild steel with 1/8″ 7018, I usually start around 115-130 amps in flat position. Watch the puddle—if it’s too cold and doesn’t wet in nicely, bump it up 5-10 amps.
How to Set Amperage on Your Welder Step-by-Step
- Select your rod and note the recommended range.
- Set polarity — most modern rods prefer DCEP for better penetration.
- Start in the middle of the range.
- Strike an arc on scrap of the same thickness and joint type.
- Observe:
- Smooth crackling sound = good.
- Loud hissing or popping = too high.
- Sticking or weak arc = too low.
- Fine-tune while welding. Listen and watch the puddle.
On inverter machines common in US shops, the digital display makes this easy. Older transformers have more feel involved.
Joint Preparation and Technique Tips That Affect Amperage Needs
Clean metal is non-negotiable, especially for 7018. Grind or wire brush mill scale, rust, and paint. Bevel thick plates for better access and fusion.
Maintain a short arc—about the diameter of the rod. Long arcs waste heat and cause spatter. Travel speed matters: too slow with high amps creates wide, shallow beads and potential burn-through. Too fast leaves narrow, ropey beads with poor penetration.
For vertical uphill, drop amps 10-15% and use a weave or whip technique to let the puddle cool slightly.
Common Mistakes with Amperage and How to Avoid Them
Running too hot: Causes undercut, excessive spatter, and warped parts. Fix: Lower amps, faster travel, or smaller rod.
Running too cold: Leads to lack of fusion, convex beads, and slag inclusions. Fix: Increase amps slightly or slow down.
Ignoring position: Vertical welds need control. Many pros run the lower third of the range.
Not accounting for machine type: Some older AC-only machines need slight adjustments compared to DC inverters.
Forgetting rod storage: Low-hydrogen rods pick up moisture and act unpredictably even at correct amps.
Safety Considerations Every Welder Must Know
Proper amperage helps stability, but always wear quality PPE: helmet with proper shade (10-12 typically), gloves, jacket, and boots. Stick welding produces intense UV and plenty of fumes—work in ventilated areas.
Be aware of arc blow on DC with magnetic fields. Ground clamps matter—poor grounding can make amperage feel inconsistent.
Comparing Electrode Types: Pros, Cons, and Best Uses
6010/6011: Pros — deep penetration, works on dirty metal, fast-freezing slag. Cons — more spatter, rougher bead. Best for — root passes, pipe, field repairs.
6013: Pros — easy arc, forgiving, nice appearance. Cons — less penetration. Best for — thin metal, hobby projects, tacks.
7018: Pros — strong, ductile welds, low hydrogen. Cons — needs clean metal and dry storage. Best for — structural steel, critical repairs, code work.
In a real shop, I often reach for 6010 for the root and 7018 for fill and cap on important joints.
Real-World Examples from the Shop Floor
Repairing a cracked loader bucket (1/2″ thick steel): 5/32″ 7018 at 170-190 amps, multiple passes, preheated slightly.
Fabricating a trailer hitch: 1/8″ 7018 on 3/8″ plate around 120-140 amps. Prepped edges with 30° bevel.
Thin auto body patch: 3/32″ 6013 at 60-75 amps to avoid burn-through.
These aren’t textbook—they’re what works day in, day out.
Advanced Tips for Consistent Results
- Whipping technique for 6010: Forward, pause, back slightly to control puddle.
- Drag technique for 7018: Keep the coating touching the plate lightly.
- Amperage and heat input: On thicker material, more amps allow faster travel and better productivity without sacrificing quality.
- Test bends or break test coupons when possible, especially for learning.
Pay attention to how the slag releases and the bead profile. A slightly convex bead is usually stronger than concave.
Building Your Own Reference System
Print a chart and laminate it for your toolbox. Over time, you’ll develop personal notes like “1/8″ 7018 flat on my Miller = 125A” that account for your specific machine and style.
Taking Your Stick Welding Skills Further
Mastering amperage turns stick welding from frustrating to reliable. You now understand not just the numbers but why they matter in real fabrication and repair work.
The next time you’re facing a tricky joint or unfamiliar material, you’ll have the confidence to select the right rod, set proper amps, prep the joint, and lay down a weld you can trust.
Always run a couple test beads on scrap matching your job before welding the actual piece. Ten seconds of testing saves hours of grinding out bad welds. Feel the arc, watch the puddle, and listen to the sound—that experience is what separates good welders from great ones.
FAQ
What amperage should I use for 1/8″ 7018 stick welding?
Start at 110-130 amps for most flat position work on 1/4″ material. Drop to 100-115 for vertical. Adjust based on puddle fluidity and penetration.
How do I know if my amperage is too high or too low?
Too high: Undercut, lots of spatter, puddle too fluid, rod burns fast. Too low: Rod sticks, poor fusion, narrow convex bead, hard to maintain arc.
Can I use the same settings for AC and DC?
DC usually gives better penetration and arc stability. On AC, you may need to increase amps slightly and expect more spatter with some rods.
What’s the best rod for beginners learning stick welding?
3/32″ or 1/8″ 6013. It’s very forgiving with easy starts and slag release, letting you focus on arc length and travel speed.
Does material type change amperage much?
Mild steel is straightforward. Stainless or cast iron may need adjustments—often lower amps and specific rods to control heat and prevent cracking. Always match filler to base metal.
