Which Welding Rod for Auto Body Panels
Top pick: ER70S-6, starting at 30-90A on DCEP. 2 rods compared with settings for this application.
Auto body welding is thin-metal work where warping and burn-through are constant threats. MIG dominates because it puts down the least heat in the most controlled way. Stick welding has almost no place in modern auto body repair.
Best Rods for Auto Body Panels
ER70S-6
The standard for auto body MIG welding. Use 0.023 inch wire with 75/25 argon/CO2. Short circuit transfer gives the most control on 18-22 gauge sheet metal.
ER70S-2
TIG filler for precision panel work and visible welds. Triple-deoxidized for the cleanest welds on thin mild steel.
Quick Amperage Reference for Auto Body Panels
| Electrode | Polarity | Common Size | Amps | Full Chart |
|---|---|---|---|---|
| ER70S-6 | DCEP | 0.035" | 50-220A | ER70S-6 chart |
| ER70S-2 | DCEN | 1/16" | 40-90A | ER70S-2 chart |
Auto Body Welding Technique
Stitch weld, do not run continuous beads. Weld 1/2 to 3/4 inch, skip 1-2 inches, weld again. Let each stitch cool. Continuous beads cause warping.
Clamp everything. Use Cleco fasteners or locking pliers every 3-4 inches.
Use the smallest wire possible. 0.023 inch wire at the lowest voltage that gives a stable arc.
Which Rod for Your Situation
Equipment You Need
A 140A MIG welder with 0.023 inch wire capability is the minimum. A spot weld kit replicates factory spot welds on panel flanges.
Mistakes to Avoid With Auto Body Panels
Running a continuous bead on sheet metal. The heat warps the panel. Always stitch weld.
Using 0.035 inch MIG wire. Too aggressive for body panels. 0.023 inch is the body shop standard.
Welding over paint or undercoating. Strip all coatings to bare metal in the weld zone.
What Goes Wrong
A DIY restorer welded quarter panels using 0.035 inch MIG wire with continuous beads. The panels warped badly. Switching to 0.023 inch wire with stitch technique laid flat with minimal filler needed.
Auto Body Panels: Common Questions
What is the best welder for auto body work?
A 140A MIG welder with 0.023 inch wire capability. Key features: short circuit transfer mode, infinite voltage adjustment, and smooth wire feed. For a full process comparison, see the MIG vs TIG vs Stick comparison.
Can you stick weld car body panels?
Not practically. Even the smallest rod (3/32 inch E6013 at 40A) puts in too much heat for 18-22 gauge sheet metal. MIG is the correct process. For broader thin-metal guidance, see welding rod for sheet metal.
What gas for auto body MIG welding?
75/25 argon/CO2 for mild steel panels. For aluminum body panels, use 100% argon with a spool gun. For gas selection across materials, see the shielding gas selection guide.
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Reference data only. Verify all settings against manufacturer documentation and the applicable welding code before use. Amperage ranges are starting points that vary by position, fit-up, and material. Welding involves serious injury risks including burns, electric shock, fume exposure, and fire. This site does not replace proper training, certification, or employer safety procedures. See full terms of use.