i used to use 15% silver brazing rod, i started with this company they supply us with 5% rod. for some reason the other day i was sweating 1-5/8" copper line for some reason when the joint starts to cool i get these fine little pin hole in the joint. even if i load it up, but i think it even happened on a 7/8" copper pipe.
im trying to figure out why. is it because im over heating and causing it to burnm the solder rod material and break down??? but i dont think so because the pipe wasnt red hot if so then ill agree with over heating,, any input?