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Old 21-04-2017, 07:20 PM   #1
Goldfeesh
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Default Mig welding stainless

Hi,

I've been thinking about welding myself an exhaust at some point. I can weld mild steel but fancied doing the exhaust in stainless. What are people's thoughts on mig welding stainless? Anyone done it? What are the results like?

I know id need the right wire/gas.

Is it worth just making an exhaust out of mild steel, attempting to mig stainless or should I try a different type of welding?
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Old 21-04-2017, 08:27 PM   #2
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With the right wire and gas ( pure argon) mig welding stainless is pretty easy - not much different to mild steel, worth getting a stainless wire brush to clean any welds up with as using a normal steel brush will contaminate the weld and cause rust.
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Old 22-04-2017, 02:54 AM   #3
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Cheers Alex il give it a go. What's the worst that can happen lol.
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Old 22-04-2017, 07:49 PM   #4
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Ideally you want to fill the inside with argon when you weld it. Cap both ends off and run a tube from the argon regulator. Open the regulator a fraction and wait a minute before you start welding.
It may seem a faf but if you don't the inside of the weld will oxidize and it will be a weak weld.
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Old 23-04-2017, 05:28 PM   #5
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And watch out for the slag pinging off everywhere
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Old 23-04-2017, 06:03 PM   #6
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Argon mix M12 / M13 is recommended for Lincoln MAG 316lsi wire. No flux so no need to avoid slag.
Check what gas you have already to save cost as it may be fine.
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Old 24-04-2017, 11:19 AM   #7
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I found welding stainless was much hotter than mild steel...

Easy enough though
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Old 07-05-2017, 08:14 PM   #8
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You can restore the corrosion resistant nature of the stainless after welding by using a good quality pickling paste, like Antox.
I weld food-grade stainless (6G Coding) at work, and would recommend using a TiG rather than a MiG if you can afford it. Much less contamination and as stainless distorts for fun, the level of distortion can be controlled a little bit easier.
What the other guys said about Argon is spot on, especially in regard to back-purging and sugaring.
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Old 07-05-2017, 11:05 PM   #9
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Quote:
Originally Posted by Raph View Post
You can restore the corrosion resistant nature of the stainless after welding by using a good quality pickling paste, like Antox.
I weld food-grade stainless (6G Coding) at work, and would recommend using a TiG rather than a MiG if you can afford it. Much less contamination and as stainless distorts for fun, the level of distortion can be controlled a little bit easier.
What the other guys said about Argon is spot on, especially in regard to back-purging and sugaring.
Again the OP is looking at MAG welding. Pure argon is not required. Argon mix is fine. I have WPQR to prove this.
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Old 08-05-2017, 06:26 PM   #10
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Mass production car exhausts that are stainless (although low quality stainless) are MIG welded without any back purging. Even the bits that are sometimes good quality stainless such as tailpipes are MIG welded.

It depends on the quality and service life that you are looking for but if you choose to you can just crack on with the MIG without much special prep.
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