Welding SS exhaust pipe
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Fleet Mechanic
Joined: Jan 2004
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From: Mendon, Massachusetts
Welding SS exhaust pipe
Can I use my MIG welder, that is set up with .035 mild steel, to weld SS exhaust pipe? Any Issues besides rust forming on the weld joint that would be a concern?
Fleet Mechanic
Joined: Nov 2006
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From: Northwest
Without more info I'm going to say... No, you can't use your MIG welder.
In general, stainless steel must be welded with some form of "shielding gas", preferably argon that keeps oxygen away from the weld puddle. Now, under very good conditions you can weld stainless steel with a MIG set up if you are pushing stainless steel filler wire and shielding with argon.
A good question.
Hobo
In general, stainless steel must be welded with some form of "shielding gas", preferably argon that keeps oxygen away from the weld puddle. Now, under very good conditions you can weld stainless steel with a MIG set up if you are pushing stainless steel filler wire and shielding with argon.
A good question.
Hobo
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Fleet Mechanic
Joined: Jan 2004
Posts: 1,682
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From: Mendon, Massachusetts
The wire in the welder now is copper coated 0.35, I'll check the spool tag but I'm sure the wire is for mild steel applications. The shielding gas is 75Argon / 25CO2.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Your all set, it will weld just fine.
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Fleet Mechanic
Joined: Jan 2004
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From: Mendon, Massachusetts
I got some scrap 2-1/2" SS pipe......will lay a few tacks down and see how they look. Thanks for your input guy's.
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5th Wheeling
Joined: Apr 2019
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As mentioned it will weld just fine with mild steel wire and c25 but will rust at the weld. You can get stainless wire and trimix at the welding store but be ready for some sticker shock.
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Fleet Mechanic
Joined: Jan 2004
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From: Mendon, Massachusetts
Finally got around to welding up a steel to SS pipe......worked out fine using .035 steel wire IMO. Would definitely get the SS wire if I was to weld up a big project with SS material.
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I had some powdered brazing flux "laying around here"... just used a stainless steel brush, sprinkled a bit on the pipe & the end of the rod and we were good!
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