Well, this is my first post, but likely won't be my last. I have more questions than answers, so running across this message board while looking at the Miller site was a pleasant find.
I'm using my old 330AB/P to weld up some 4130 tubing, mostly .058 wall thickness. I had been cleaning the tubing with lacquer thinner, but some of the welds had not been as clean as I would like. Just noticed a recommendation elsewhere on the miller site to use isopropyl alcohol or acetone to preclean, and plan to try both.
My question (finally) is whether 4130 requires cleaning with sandpaper or other mechanical cleaning process prior to TIG welding? I'm using 2% thoriated 3/32 tungsten, 15 cf/h argon, and 50 amps.
By the way, any of you know what my old welder might be worth if I get to trade it in on one of the new pulse machines?
Rob
I'm using my old 330AB/P to weld up some 4130 tubing, mostly .058 wall thickness. I had been cleaning the tubing with lacquer thinner, but some of the welds had not been as clean as I would like. Just noticed a recommendation elsewhere on the miller site to use isopropyl alcohol or acetone to preclean, and plan to try both.
My question (finally) is whether 4130 requires cleaning with sandpaper or other mechanical cleaning process prior to TIG welding? I'm using 2% thoriated 3/32 tungsten, 15 cf/h argon, and 50 amps.
By the way, any of you know what my old welder might be worth if I get to trade it in on one of the new pulse machines?
Rob
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