View Full Version : can i tig weld mild steel on ac?

11-21-2006, 10:48 PM
Hi I wanted to buy a cheap stick welder and upgrade it to a Tig. I will mainly be welding mild steel and sometimes aluminum under 1/8 inch. I was looking at the:

Deca welding inverter 100 amp,75 amp ac/dc

Deca primus ac/dc variable 230 ac amps/ 140dc amps

Now these are both at princess auto and i will have 2 get the Tig torch attachment in order to convrt them. I would like to know if i can Tig weld mild steel on the ac function (please give insite im a noob and a simple NO will not cut it). Also if i get pure argon can i weld steel with it? Can I use Co2? How long will the tank last me?

Also, where can i find the welding charts to match the plate thickness 2 ampracge ratio?

Thanks for the help.

Mike W
11-21-2006, 11:29 PM
I have welded steel with AC tig. Argon is what you use, CO2 won't work. It is not inert. The argon cylinder will go down faster than you might think. Don't try to get by with a small cylinder.

11-22-2006, 05:59 AM
Don't forget to get a freq box. The arc of AC on tig is not stable enough to work alone. The HF will stablize the arc.