MIG Thickness Setting

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Hi, I'm new to the forum. Been stick welding for years and recently bought a MIG welder for an ongoing project. So far test welds have been good,. Now I have question regarding heat/wire feed settings. There's plenty of info for mig weld settings for various thicknesses of steel, but how about welding different thickness together? For example: Welding a 1/2" bung to 14gauge sheet metal, or 1/4" flat bar to .125 thick tubing? (see photos) My guess is to set up for the thick metal and concentrate most of the heat there. My fear is burning through the thin metal or going too fast an not getting good penetration.



Reply:Burn a hole in it like the rest of us, fill it.www.urkafarms.com
Reply:Not much different than stick welding thin material to thick, you keep the arc on the thicker piece. The nice thing with Mig is you can turn the heat off by letting go of the trigger. You can do a bunch of tacks as well like is used for autobody work.
Reply:most machine have amp and wire speeds setting inside a door.   Id set it for 3/16 steel.We've done so much, for so long, with so little. Were now qualified to do anything with nothing !
Reply:In both of your cases, go with an in-between setting. For the bung to 14 ga I'd probably go with a hot 1/8" T joint setting. With the 1/4" to 1/8" you might be able to get away with a hot 1/8" T joint setting too. By hot I mean 140 - 150 amp range.