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Old Today, 06:05 AM   #1
Strangler
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Default MIG welding stainless???

I have to weld some stainless to repair a friends boat lift. There is enough welding to be done that I don't want to bother someone with a TIG, and I don't own one. Before Google tells me what to do, I will ask you guys.
Is 80/20 shielding gas ok? Similar diameter wire to what I would use for mild steel? Same tips? Any precautions? This will be a structural part- any thoughts on imbrittlement? 3/16" plate to 3/16" 2x3 box tube. Thanks in advance.
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Old Today, 06:23 AM   #2
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I'm not an expert, however I know you need to use a different shielding gas. We just went through this a month ago. For the life of me I can't remember what it was that we bought though. Outside of that and obviously wire we didn't change anything and it worked just fine.
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Old Today, 06:24 AM   #3
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Argon, it was argon gas.
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Old Today, 06:50 AM   #4
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I don't know much about welding SS, but I've done a little research into it for welding on my brewing shit and Argon was what everyone talked about using.
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Old Today, 07:00 AM   #5
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I've always used the same gas for steel or stainless. Works the same. Had the welds certified too. I use 95% argon 5% oxygen.
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Old Today, 07:02 AM   #6
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Should be nothing to worry about. I would think your 80/20 mix would be fine too. Try it, as long as you don't get porosity you should be good to go.
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Old Today, 07:40 AM   #7
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Argon and in my experience you have have to crank up the settings just a little bit.
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Old Today, 08:04 AM   #8
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Umm.....helium so your welds look like money.
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Old Today, 08:48 AM   #9
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Go to Harbor Freight and get the flux core stainless wire.
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Old Today, 09:25 AM   #10
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In non cosmetic projects, I've just used er70s-6 mild steel wire with regular shielding gas. I'm not sure if this would meet your needs in a marine application but it will permanently attach two pieces of stainless together. If I want pretty welds I Always TIG. I've used shielded stainless wire before with pretty good results but I think you have to use a different polarity than mild wire. It's been a while I'm not sure.
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