Not too much info on this.
I need help. I've tried everything except going down to .023 wire size, which I don't expect will help all that much from .025.
I can't keep from burning through the sheet metal (as well as some good warpage). I've done about 40 practice welds now trying various combinations.
What I've done so far: heat sink putty beneath the weld, heat sink putty on either side of the weld, aluminum tape beneath the weld, flattened copper pipe beneath the weld, fiberglass and aluminum tape beneath the weld, increased wire and travel speed, drag/push angle adjustment, used an extension cord to try and reduce the voltage. Right now my best welds have been single tacks along the whole joint. I've also switched the gun to DCEN polarity, but that doesn't fully penetrate enough and leaves me with a Mt. Everest of a weld bead. If i do get the puddle hot enough to flatten out a bit with DCEN...BURN THROUGH!
Any veterans out there with an idea of what else i can do?
P.S. I'm practicing on both a slightly rust pitted old panel and clean sheet.
My Equipment:
Lincoln 100 buzz box (mig/flux)
75%Ar25%CO2 @15-30CFH
yes i like TIG, too, but I have what I have
