I"m starting with clean steel without any scale and have even tried cleaning very well with acatone and a clean stainless brush before welding. I don't seem to have any problems with any other types of steel ie: stainless or mild steel. The only time I run into a perosity issues is when I'm try...

I'm having a hard time welding carbon steels without getting alot of porosity and pittiing in my welds. No problems w/mild steel. Using 2% thorated tungston. Same problem with or without filler rod. Does anyone have any tips to remedy my problems?