Enjoying my PM 205. Tig welding is new to me but so far I am happy with the welder. My question today is regarding a brown haze that was surounding an area I was doing a fillet weld. I was welding 1/8th wall thickness mild steel tubing. I am not sure if the brown haze, kind of a powder around the weld area is a sign of problems with argon flow, dirty steel or tungsten contamination. I did rework the area a bit after initial pass as my penetration was not right. Thanks in Advance ............Wayne.