does this go bad over time (almost 2 years old)..my welds are looking shittie..grant it im know pro but before my accident they werre alot better lookin than now...after i tack theres a black smut (SOOT)around the tack..then if i try to run a bead theres whiteish yellowish flacky look around the weld...but im more concered with the black smut(SOOT) cause im welding sheet metal...any ideas...and it dont seem like its pentatrating either .. also whats the best mixture.. for sheet metal ..i think i have 75/25 now
Yellow tells me it's most likely galvanized, white smoke and headaches afterwards. Don't weld galvanized metal without a good clean personal air supply, or a fan blowing in your favor along with a spare bottle of welding gas because your cfm's will be a lot higher to make up for the offending fan. If 75/25 can go bad, I was told they separate at under 500 psi, but won't compromise a weld either way. If I'm wrong, please advise.
It sounds like it's the metal you're using. I get metal from a local guy that is used for stamping parts. It's got a thin coating on it sort of like galvanized but not quite, it's the same anti corrosion panels new cars use. Can't remember what it's called now though, but it makes the white powder and is harder to weld, I just grind off the coating where I'll be welding and it's fine.
If that metal is Terneplate (sp.?) it is coated with lead. This is for lubrication when punched or drawn........
If you get Zinc poisoning, Drink plain white whole milk. It counteracts the zinc oxide and will clear your system of zinc.
Nay-Terneplate has been the material of choice for gas tanks for many, many years. And I guarentee that the lead was not sufficient to act as a drawing lubricant-we still had to lube up our draw dies.
If the surface was ground clean before welding check to make sure you really do have gas flow. "Low or No" gas flow will make even non-galvinized steel turn black/sooty and sometimes have gray or yellow from a contaminant... the gas doesn't go bad.
agree, sounds like galv steel ....never had gas go bad either. I could be off base but the black around the weld and poor penetrations sounds like your gas is getting interrupted or not getting to the nozzle......
Dude you said your welds had black SMUT. I already found a picture of "Black Tail" magazine was ready to post it but I held back. I didn't want to get kicked off my favorite site. Anyway I think you mean soot.
not unless a 39 chevy was galvanised ...but it doesnt matter were i weld if its welding up the relief cuts or old roof skin to new sheet metal ribbon piece..same sheet metal that had for all my patch panels (4x10 sheet)
What's the possibility of welding into an old lead filled area that wasn't cleaned good enough? What smoke color/leftover tracks on the welded metal would you have? The possible offending metal would leave a "dusting" on the metal what would look different. Not sure how to describe what I'm picturing.
i guess we were both right ..smut and soot is the same thing ''transitive verb make something dirty: to mark or dirty something with smuts''
no chance at all ..ive grinded off paint to bare metal...this is happening where ever i tack..dead center of roof ,drip rails, anywhere i pull the trigger
same tanks that have not been refilled? same metal you used before? all metal ground clean? what does that leave?? the wire. same wire? did the wire get contaminated somehow? maybe the cat peed on it. your symyoms sound like galvanized like everyone else said. try it out on another piece of metal and see what happens. weird. let us know what you find out and we'll all learn something
Sounds like the gas is not turned on :to trouble shoot turn the gas off at the bottle .My bet is same results.Ask me how I know that. if same results repair welder.
Turn gas off at the bottle. if same results fix welder. You are not getting gas flow when the welding starts. Ask me how I know that one
My gas supplier once told me the gas cannot work right if the tank has been sitting unused for a long time. The theory was that the two gases separated from sitting there so long without movement. He said to lay the tank on it's side, and roll it back and forth on the ground, to mix the gasses back together. I have no idea if he was handing me a line or what since I'm not a professional welder. When I have that kind of trouble I usually bring the tank in and have them check it.
Is the welder setup for both polarities (for welding flux core wire)? Maybe the leads got switched to the wrong polarity? Even if the gases separated, it shouldn't cause too much trouble with straight argon or CO2.
Gasses seperating... That is likely the most bullshit thing I have ever read. The guy who sold you that line is ignorant of molecular gas dynamics. That bottle could sit around until the next ice age and never show the slightest separation between the constituant gasses. That would be a violotion of the second law of thermodynamics. And the gasses will never go bad. ever.
yep ,did it just changed the wire to .23 from .35 thinking it might be ..plus i like 23..no cat,39 chevy roof not galv...have tried another peice same ....anyone know of a way to check psi from welding gun/?..bottle reads about 97 98 lbs tooks gauges off put my hand over the bottle neck turned the gas on and it had plenty of pressure (hard to hold my hand over it )..i think i might just say fuckit and go change the bottle out just for shits and giggles
I'd try a weld on just some scrap crap - to validate that it isn't the material or prep. If you only have 98 lbs in the bottle, it is dang near empty anyway . . . might as well get a new one.
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