I'm welding up an exhaust down pipe for a friend out of stainless and I'm having a hard time getting nice golden brown welds. Most of the time their dark grey or black and appear to be scaling. I'm purging the pipe and the back side looks good. I think my problem is heat. The pipe is 14 gauge and the plate is 3/8" so I'm having to put a lot of heat into the weld to get good penetration on the 3/8". I've turned up the gas flow and I'm still seeing the scaling.
Any suggestions.
Kevin