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Old 10-28-2020, 08:31 AM   #1
crossy
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MIG welding with stanless or Aluminum,COVER(shield) GAS

I am well versed at nearly all types of materials that can be welded. HAD Nuclear and ASME quals in my heyday. That said, I had only used my home MIG machine for LIGHT fabrication and rust repair on carbon steel(LOTS of it,lol). I just bought a small spool of 304L stainless and want to TRY it on stainless exhaust. The Lincoln website(my new Machine is good,230v Hobart) recommends a tri gas mix with 90% Helium, their plan ‘B’ is a dual mix with 98% Argon. I have pure Argon already here for my portable, Chinese TIG machine. Has anyone tried 100% Argon on their MIG with stainless???, I understand that the Helium helps flatten the puddle, but I am not real concerned with a raised bead on the exhaust, only that it actually weklds the two pieces together, and doesn’t rust. how about Aluminum in the MIG like a 4043? Thanx- Crossy
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Old 10-28-2020, 09:55 AM   #2
richard2717
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Re: MIG welding with stanless or Aluminum,COVER(shield) GAS

I Use 100% argon with no issues on occasion
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Old 10-29-2020, 08:06 PM   #3
PGSigns
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Re: MIG welding with stanless or Aluminum,COVER(shield) GAS

I used to do a lot of stainless welding up oyster shucking tables. The tri mix does a lot better job. See if your local welding supply has a smaller bottle.
Jimmy
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