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I recently acquired a Campbell Hausfeld mig-flux 80 I am trying to weld 22ga sheet steel using a .030m flux core wire but I get blow throughs and alot of spattering even at low settings and at almost any feed speed. Some welds are fine but the very next one using the same setting blows right through.Should I keep trying trial and error or are there other seetings on this machine I need to try?Heres a pic:Allthough the other button welds look bad they get decent penetration with out blwoing through bu the one next to it suddenly blows right through.thanks in advance.
Reply:Infortunately 22 ga is a little too thin for the .030 flux. You really need to be running .025 solid wire with gas. flux burns hoter than solid at equal wire dia. More to it, there is not a flux smaller than .03 Good luckIF it Catches...Let it Burn
Reply:You could try clamping a non-ferrous heat sink on the backside of where your welding. When I was learning to MIG on auto body sheet metal, I found that. along with a heat sink, if I made very short welds (when I say short, I mean that I let the trigger go a split second after the arc started), I was able to turn my voltage up a notch. This made a better weld and ultimately put less heat to the surrounding metal.There are no small projects
Reply:You dont mention it, but from the picture it looks like you are welding galvanized.If so, this is part of your problem.Galvanized welds poorly, no matter what. The zinc has such a lower melting point from the steel that it liquefies, boils, vaporizes, and generally screws up your weld.Old timers soldered galvanized, this will work, but its not quick and easy like mig welding.I sometimes tig weld galvanized with a silicon bronze rod- this works pretty well, with much less bubble bubble toil and trouble. But a decent welder to do this runs 3 to 6 times as much money as your little mig machine.
Reply:even if I ran a grinder over it to remove the zinc? I did that on all four sides.
Reply:That might be why you are getting burnthrough in some places and not others. The grinding might not have been perfectly uniform across the sheet and some spots may be thinner than others...so, you arent actually welding the same thickness each time. If that's the case, having uniform settings for each weld wont matter...you don't have uniform metal.Smithboy...if it ain't broke, you ain't tryin'.
Reply:That makes sense, thanks smithboy. Does not having gas also make a difference?I am planning to get a 25/75 co2 argon 40cf tank and using .025m solid wire rather than the .030 flux core.what should I use to remove the zinc galvanize? I am assuming that I need to remove the galvinization in ordere to minimize the toxic fumes and produce a better weld, is this true?
Reply:You need to go old school.... Muriatic acid to wash the seams, and lead solder that crap up with mapp gas.
Reply:I weld alot of 22 gauge sheetmetal with my millermatic passport machine using 023 wire and c25 gas mix 75 argon 25 co2 and it works beautiful.I use a wire wheel to remove the zinc and start welding.It is better for uniformity then a grinding wheel.Trick is not too big of welds and your done.Nobody moves nobody gets hurt(safety first)millematic passportmiller 375 plasmacutter |
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发表于 2021-9-1 01:00:22