The writings I've looked at (in over 40 years of playing with torches and tubes) all say pretty much the same thing concerning cooling. Draft free space. Open air with no water/oil bath.


I've always felt that it's the initial drop off from brazing temps that is most critical for the steel's retaining it's intended grain and characteristics. I've also been told that it's a differential of temp that produces the stresses that distort tubes. One reason that hearth brazing was considered best by some as it heats a large area with rather even temps through out the joint. Andy