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can i tig weld mild steel on ac?

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  • can i tig weld mild steel on ac?

    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.

  • #2
    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.
    What do I know I am just an electronics technician.


    • #3
      But wait there is more..................

      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.

      XMT 300CC/CV (yes it still works)
      Bobcat 225, Hobart Hefty CC/CV wire feeder, Profax spool gun,Victor & Smith O/A, Lincoln Tombstone(sold), Airco HF box (old Miller) MM175, IR 4KW gen set,all paid for, all work. My newest addition MM130 salvaged from a Kitrina flood area. Cleaned up and works great. . Just added a Miller Thunderbolt AC/DC, total cost to repair both less than $200.00, they both work great...another Katrina cast off.