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.)