What pressure do you use for your MIG gas setup. I read something about to much pressure being as much of a problem as to little. Do you change the pressure for welding different materials? Is there a way to dial the pressure in?
MIG Welding Gas Pressure
Steve Johnson
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What pressure do you use for your MIG gas setup. I read something about to much pressure being as much of a problem as to little. Do you change the pressure for welding different materials? Is there a way to dial the pressure in?
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Oh, ok. Thanks. First thing I'll be doing is new floor pans. After that, no idea. I'd like to attempt body panels, but I think I'm better off leaving that to a professional
ok - gas flow is dependant upon orifice size (cup).
I use 15-20 CFH for a small mig gun and 30-45 CFH for a bigger cup (especially if it is a code weld). However, for a hobbiest with a small gun, the 15 to 20 is probably acceptable.
If the flow is too high, a vortexial flow will propogate causing porosity( from sucking in ambient air into the weld ). ALso too much gas flow =waste..
gas type- most modern welding gas blends are the 75%/25% (argon/CO2). even if the argon/co2 blend was a 80/20 would not be bad as we use it alot in the automated pipe welding industry.
I would suggest to you to not try a 100% blend of argon or 100% co2 as the weld pool will be harder to control.
100% CO2 will make alot of spatter (read BBs and a lot of grinding/sanding afterward).
I use 15-20 CFH for a small mig gun and 30-45 CFH for a bigger cup (especially if it is a code weld). However, for a hobbiest with a small gun, the 15 to 20 is probably acceptable.
If the flow is too high, a vortexial flow will propogate causing porosity( from sucking in ambient air into the weld ). ALso too much gas flow =waste..
gas type- most modern welding gas blends are the 75%/25% (argon/CO2). even if the argon/co2 blend was a 80/20 would not be bad as we use it alot in the automated pipe welding industry.
I would suggest to you to not try a 100% blend of argon or 100% co2 as the weld pool will be harder to control.
100% CO2 will make alot of spatter (read BBs and a lot of grinding/sanding afterward).
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I guess I would be the hobbiest catagory
Just bought the Lincoln 140C. First time I've ever welded in my life. So far I've repaired my metal garage and made myself a welding cart (with the flux core wire).I'm anxious to see how much better the welds look with the cooling gas, because the welds I've done so far sure wouldn't win any awards! lol
I'll be sure to let them know I need the 75/25 or 80/20 when I get the tank filled
Thanks
Bill,
Just wanted to clarify for you ... the gas is not for cooling, it is a "shielding" gas to keep atmospheric contamination out of the weld. It serves the same purpose as the flux on your coated wire, but you dont have to chip it off when you are done welding.
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Bill. When I bought my MiG welder, I taught myself to weld. I used the flux wire for about a year. I finally went out and bought a bottle. Let me tell you, Everything you thing you know won't mean squat. Using the gas is a different animal. The welds look 100% better but the style is totally different. You will need a little more heat and a faster feed for the same guage metal than the flux wire needed. Practice on some scrap metal to get the feel of it. I run my gas at about 17psi. I seem to get the best results there.
Good luck.
Good luck.
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