I was looking at my new frame and since it's painted black I can't see the welds completely. After watching that new mike laird video it got me thinking about the different frames that failed on me at the welds and was wondering if my new frame had good welding on it. When I look down the seat tube, I can see rust forming on the inside wall in the shape of where the welds are for the right seat stay and the left side of the top tube. I was wondering why the rust only started on those welds and not the others, and was wondering if that was a sign of burnt welds. Any info is greatly appreciated. Thanks!