Welding Rod Amperage Chart: Stick Rod Amps by Size

A welding rod amperage chart provides the operating current range for stick electrodes based on core diameter, flux coating, and welding position. Setting the right amperage balances arc stability, penetration, and puddle control so you avoid sticking the electrode or burning through the steel. For home, farm, and repair work, matching electrode size to machine output keeps beads sound and spatter low. This guide covers recommended stick rod amps by size, explains how flux type and polarity change heat input, and shows how to set your machine for clean welds.

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The amperage range in summary

Stick welding current melts both the metal core wire and the surrounding flux coating to create the molten puddle and protective gas shield. If current is set below the stated range of the electrode, the arc stumbles, the rod sticks to the plate, and cold lap leaves weak joints. If current exceeds the upper limit, the rod overheats before finishing, flux flakes away, spatter covers the workpiece, and arc force blows holes through thinner steel. Choosing the right setting within the manufacturer range provides smooth metal transfer and complete root fusion.

Side by side

Electrode classification	Core diameter	Stated amperage range	Current and polarity	Reference listing
E6013 mild steel	1/16 inch	20-40 A	AC or DC	Hot Max 22075
E6013 mild steel	3/32 inch	45A-90A	AC or DC	SALI E6013
E7018 low hydrogen	3/32 inch	70A-100A	AC or DC reverse polarity	YESWELDER E7018
E4043 aluminum	3/32 inch	35-80A	AC or DC+	ALGESBPO E4043
E6013 mild steel	1/8 inch	80A-130A	AC or DC	YESWELDER E6013
E4043 aluminum	1/8 inch	80-120A	AC or DC+	ALGESBPO E4043
E4043 aluminum	5/32 inch	120-160A	AC or DC+	ALGESBPO E4043
E6010 carbon steel	3/32 inch or 1/8 inch	Not stated	DC+	ATLAS WELDER E6010
Hardfacing	5/32 inch	Not stated	Not stated	Forney 42401

Manufacturer amperage ranges published on packaging represent typical starting points on carbon steel or aluminum base metals. Operating conditions, joint fit-up, machine calibration, and welding orientation will shift where your machine runs best within each stated window. Always verify the specifications printed on your electrode box and consult your machine manual before striking an arc.

Welding rod amperage chart

The relationship between rod diameter and operating current is straightforward: larger core diameters carry higher amperage to melt more filler metal and penetrate deeper joints. When working with common mild steel electrodes such as E6013, maker specifications show how amperage scales with size. For 1/16-inch E6013, Hot Max lists 20-40 A for thin sheet and light repair work. Moving up to 3/32-inch diameter, SALI lists 45A-90A for its E6013 electrodes. For 1/8-inch E6013, YESWELDER lists 80A-130A. Different electrode compositions also require different current levels at the same diameter; for example, YESWELDER lists 70A-100A for 3/32-inch E7018 low-hydrogen electrodes. For specialty aluminum stick welding, ALGESBPO lists 35-80A for 3/32-inch, 80-120A for 1/8-inch, and 120-160A for 5/32-inch E4043 electrodes on base metal with minimum 3/32-inch thickness. Readers selecting equipment for these rods can review our guide to stick welders.

When smaller rod diameters are the better choice

• Thin sheet and light tubing. A 1/16-inch or 3/32-inch electrode maintains a stable arc at low current with minimal heat input, reducing the chance of blowing holes through thin sections.
• Vertical and overhead joints. Smaller molten puddles freeze faster against gravity, making 3/32-inch rods easier to control on out-of-position welds.
• Low-output stick welders. Smaller rods run reliably on portable household machines that cannot sustain continuous high current.
• Root passes on open joints. Thin rods slip into bevel roots and bridge poor fit-up gaps without excessive heat buildup.

For heavy maintenance projects on gates and equipment, our guide to the best stick welder for farm use covers machines designed to burn these rods in shop and field environments.

When larger rod diameters are the better choice

• Thick plate and heavy structural steel. Electrodes measuring 1/8-inch and 5/32-inch carry higher current to penetrate deep into heavy bevels and structural angles.
• High deposition filling passes. A thicker core wire deposits more filler metal per minute, filling heavy weld grooves in fewer passes.
• Surface buildup and hardfacing. Large rods cover worn steel surfaces rapidly; for example, Forney lists 5/32-inch Supercote hardfacing rods with RC 52-58 hardness for rebuilding machinery parts.
• Flat fillet welds. In gravity-assisted positions, a large molten puddle can spread smoothly into a wide, uniform bead.

How polarity and flux coating change heat input

Electrode classification numbers and machine polarity directly influence how much heat reaches the workpiece at a given amperage dial setting:

• DCEP (Direct Current Electrode Positive). Reverse polarity is widely used for structural carbon steel stick welding, producing deep joint penetration and a stable arc. YESWELDER lists DC reverse polarity as well as AC for its E7018 electrodes.
• DCEN (Direct Current Electrode Negative). Straight polarity produces higher electrode melt-off rates with shallower penetration into the base metal, which helps avoid burn-through on lighter sections. For specialty aluminum stick welding, KAZAKA recommends DCEN power sources for its 1/8-inch E4043 rods.
• Alternating Current (AC). Alternating current switches polarity continuously, which prevents arc blow when welding near magnetic fields, tack welds, or heavy plate corners. SALI and Buelkmag list AC and DC capability for E6013 electrodes.
• Flux coating types. Rutile E6013 rods provide a soft arc with light penetration, low spatter, and easy slag release. Cellulose E6010 rods produce a forceful, deep-penetrating arc on DC+, as noted on ATLAS WELDER listings for root pass and pipeline work. Iron powder in E7018 increases deposition efficiency for structural fabrications.

For a detailed breakdown of current types, read our comparison of stick welder AC vs DC.

How to adjust amperage for welding position

The amperage span printed on an electrode package provides an overall operating window for all stated positions. Because gravity pulls on the molten pool during out-of-position welding, machine output must be adjusted within that window based on joint orientation:

• Flat position. Run in the middle to upper portion of the stated amperage window. For example, running a YESWELDER 1/8-inch E6013 rod toward the upper part of its 80A-130A span creates a fluid puddle that washes smoothly into both edges of the joint.
• Vertical-up position. Set current toward the lower end of the stated range. A cooler, smaller puddle freezes before sagging, allowing the operator to build a solid shelf step by step.
• Overhead position. Lower amperage keeps the puddle small and prevents molten filler metal from dripping out of the joint.
• Joint fit-up gaps. Open roots and uneven fit-up require running near the bottom of the recommended amperage range to avoid burn-through, whereas tight joints permit higher current for thorough penetration.

For operational practice and striking guidance, see our walkthrough on how to use a stick welder.

Stick welding safety and slag hazards. Stick welding generates intense ultraviolet radiation, sparks, and hot slag that can pop off the bead during cooling or chipping. Always wear a shade-appropriate welding helmet, flame-resistant leather gloves, and safety glasses beneath the hood when deslagging welds. Provide adequate shop ventilation or work outdoors to keep your breathing zone clear of electrode fumes. Keep a fire extinguisher nearby, clear dry vegetation and flammable materials from the work area, and inspect ground connections before striking an arc. Consult our guide to welding safety gear for essential personal protective equipment.

Frequently Asked Questions

How do I know if my stick welding amperage is set correctly?

A correct setting produces a crisp, steady crackling sound without excessive spatter or arc wandering. The molten puddle remains easy to guide, and the bead surface cools with uniform ripples and good tie-in at the edges. Slag peels off cleanly without sticking hard to the face of the bead.

Why do vertical-up welds require lower amperage than flat welds?

When welding vertical-up, gravity pulls the molten pool downward. Setting machine current toward the lower end of the electrode range creates a smaller, cooler puddle that freezes quickly into a supporting shelf. Excessive heat in a vertical-up progression causes molten steel to spill, resulting in sagging beads and undercut along the toes.

Can I run E7018 rods on an AC stick welder?

Standard E7018 electrodes run best on DCEP reverse polarity, but maker listings indicate they can operate on AC current when the machine open-circuit voltage is sufficient. If arc stability is inconsistent on basic AC equipment, an AC-specific variant or an E6013 rod provides smoother re-striking.

What electrode diameter should a beginner start with?

A 3/32-inch electrode is widely regarded as a manageable size for new operators because it strikes easily and runs well on modest amperage. It requires less machine power than a 1/8-inch rod while providing better penetration and arc stability than very thin electrodes.

Why does my welding rod stick to the steel when striking?

Electrodes stick when the machine current is set below the starting range or when the rod is held in contact with the workpiece for too long. Increasing amperage slightly within the maker window provides sufficient arc energy to maintain a continuous plasma column upon contact.

Related: how to use a stick welder, best stick welder for farm use, best welding rods for mild steel, best welding rods for AC welder, and the stick welders hub. Also see our guide to welding consumables.

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