please help

By serguei Date 06-21-2004 12:46

If anyone could give me a tip on mild steel welding with use of TIG. I've purchased used Lincoln Square Wave TIG 250. I tried 2% thoriated tungsten electrode 1/16" diameter, added material is also 1/16" diameter mild steel. Gas: 75% argon, 25% CO2, 15CFH pressure. Regardless of different settings I've tried: 2-step, 4-step, with pulser or without, all DC(-) - my results are pathetic so far. I'm trying to weld "T" from 1/4" diameter mild steel rods and it is my first experience with TIG. Please help with settings (gas type, pressure, amperage, etc.)

By pipewelder_1999 (****)

Date 06-21-2004 13:15

Wrong Gas. Use Pure Argon

By TigSculptor Date 06-21-2004 19:28

Exactly what type of results are you getting?? Is
the resulting weld "dirty"?? Is the weld not strong
enough?? Ditto on the comment about gas type.
100% argon seems to work fine on 1/4" mild steel
for me. Also make sure that the joint is clean
before welding. Lasty, what current are you using??

Victor