Tig Aluminum...Yellow powder on cup??

admin

Hi People,Just wanted to know if anyone has experienced a yellow powder looking substance on the gas cup when welding aluminum??  My setup is with a Syncrowave on AC, 15 to 20 cfm on the pure Argon, 2% Thor. tung. welding on boat outdrives / lower units. I do know about the contamination issues.These units usually have hairline cracks in them. I grind them out to a V shape, clean all areas with a SS brush, then wipe with Acetone before welding. I suspect that it is something in the base aluminum.Thanks for your helpKell
Reply:The yellow powder is from contamination....usually on the tungsten side.Are you dipping the tungsten into the work accidentally?How far do you have the tungsten sticking out from the cup?- Paulhttp://all-a-cart.comWelding Cart Kits and accessories