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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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