[Clevohead]

Hi

I am just starting out with a "unimig" 140amp DC invertor with lift TIG function. I am atempting to weld 20 guage(0.9mm) sheet metal for automotive repairs. The problem I am having is that it appears to be too hot and I am getting burn through, the welder is set at 10A(lowest it will go, and I have a flow of 10L/min argon/co2, I am using 1.6mm electrodes sharpened to 30 degrees. I have the torch attached to the negative, and my clamp is in the positve.

What am I doing wrong?

Is my welder too big? Do I need a high frequency unit?

I will be getting some clean scrap to practice on and will be percivering until I get it down pat.

Any help you guys can offer in the meantime would be greatly appreciated.

Kind Regards
Ben

[admin]

Ben, get some straight argon for your tig welding. the ar/c02 mix is only for mig and sounds like your main problem.
10 amps should be plenty low enough to weld without holes on 20 ga.

thanks,

jody

[CHEMA CARDENAS]

i agree with admin. you should think about your tungsten electrode. i think you should try out the .040 mm red point for low amperage. and you should be fine, do 100%argon too.

best of luck you´ll get there. i love body work too.

mainly offroad

[Clevohead]

Thanks for the help, i am getting the gas exchanged today.