Which Welding Rod for Exhaust Pipe Repair
Top pick: E6013, starting at 40-90A on AC/DCEP/DCEN. 4 rods compared with settings for this application.
Exhaust pipe is thin-wall tubing, usually 16-18 gauge mild steel or stainless. The challenge is welding thin material without burn-through while getting enough penetration to hold under vibration and heat cycling. The right rod depends on the pipe material, your welding process, and whether you are repairing or fabricating.
Best Rods for Exhaust Pipe
E6013
Best stick rod for mild steel exhaust. Light penetration and smooth arc minimize burn-through on thin pipe. Use 3/32 inch diameter at 40-50 amps.
ER70S-6
Best MIG wire for mild steel exhaust. Use 0.023 or 0.030 inch wire with 75/25 Ar/CO2. MIG gives the most control on thin material.
ER308L
Best TIG/MIG wire for 304 stainless exhaust. Use 100% argon for TIG, 98/2 Ar/CO2 for MIG. Back purge stainless tubing during TIG welding.
ER309L
For stainless-to-mild-steel joints at flanges and adapters. Compensates for carbon steel dilution to maintain corrosion resistance at the joint.
Quick Amperage Reference for Exhaust Pipe
| Electrode | Polarity | Common Size | Amps | Full Chart |
|---|---|---|---|---|
| E6013 | AC / DCEP / DCEN | 1/8" | 70-120A | E6013 chart |
| ER70S-6 | DCEP | 0.035" | 50-220A | ER70S-6 chart |
| ER308L | DCEP / DCEN | .035" | 60-200A | ER308L chart |
| ER309L | DCEP / DCEN | 0.035" | 60-200A | ER309L chart |
Exhaust Pipe Welding Tips
Keep heat low. Tack every 1-2 inches before running full beads. Weld downhill on vertical sections for speed and reduced heat input. If stick welding, use the smallest diameter rod available. Whip technique helps control heat on thin material. For stainless, do not over-weld. One pass with proper penetration beats multiple passes that overheat the material.
Which Rod for Your Situation
Equipment You Need
Any welder works for mild steel exhaust. For stainless, TIG is preferred because it minimizes heat input and produces the cleanest bead. A 200A TIG with AC/DC covers both steel and aluminum exhaust. A foot pedal is important for heat control on thin tubing.
Mistakes to Avoid With Exhaust Pipe
Using E6011 or E6010 on exhaust pipe. These rods have aggressive, deep-penetrating arcs that blow through thin tubing. Using 75/25 Ar/CO2 on stainless exhaust causes carbon pickup and reduces corrosion resistance. Welding over heavy rust without cleaning traps contaminants in the weld.
What Goes Wrong
A shop welded a stainless exhaust manifold with ER308L but used 75/25 Ar/CO2 shielding gas instead of pure argon. The CO2 caused carbon pickup in the weld, reducing corrosion resistance. Within 6 months the welds turned brown and pitted. The entire manifold was scrapped. Pure argon was the only change needed.
Exhaust Pipe: Common Questions
What is the best rod for welding exhaust pipe?
E6013 in 3/32 inch diameter for mild steel exhaust with a stick welder. Its light penetration prevents burn-through on thin wall tubing (16-18 gauge). For MIG, ER70S-6 in 0.023 or 0.030 inch with short circuit transfer. For stainless exhaust, ER308L with TIG and 100% argon. See the E6013 amperage chart for per-diameter settings on thin material. For stainless exhaust details, see the ER308L specifications.
What amps for welding exhaust pipe?
40-50A with 3/32 inch E6013 on mild steel exhaust. Keep heat as low as possible while maintaining fusion. For MIG, 30-60A with 0.023 inch ER70S-6 wire. Tack every 1-2 inches before running continuous beads to control warping.
Can you stick weld a stainless exhaust?
Technically yes with E308L-16 electrodes, but TIG produces far better results on thin stainless tubing. Stick deposits more heat and creates more spatter. TIG with ER308L filler and pure argon gives the cleanest bead and preserves corrosion resistance. Back purge the inside of the tube to prevent oxidation. If stick is your only option, see the E308L-16 specifications for settings. For gas selection and technique details, read the stainless steel welding basics.
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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.