Using my 88amp mig welder for?

you failed on the SS because you used Argon.

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Im make a cart now and the flux-core is working fine. And im

yes , but this time get a C25 argon- Co mix

not true, your machine does not have the amprage to do aluminum, also it is very hard to push a thin alu wire thru a 10' mig gun. copper ? I don't think so.

stick with mild steel on that machine it wil do just fine for hobby stuff arond the house, with flux core or solid wire. I built a picket fence around my yard with a lincoln pro mig 135 using flux core wire. never any trouble with it, Nice little prtable unit, I wish I wold still have one laying around.

would you STOP saying ARGON with your MIG. !!!!

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and then get a TIG machine for Al and SS & Cu or shld i

if you want to do alu, stainless and copper, you will need a different machine altogether , A TIG would be nice. But if I were you I would get good with the machine you got now practicing on mild steel.

Look..... I am not trying to be rude, but you need to stop asking the samething over and over, a bunch of us told you...... many times..... that your MIG and argon will not work on stainless , at least not the way you want it. just because one person (dimond jim ) said "yes it wil work" and that is what you wanted to hear ......it does not make it so.

learning it the "hard hard way " is not always bad

good luck