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Back in the day some almost 50 years ago before MIG welding we used to braze up headers for stock cars .Bend the sweeps up on a tubing bender and braze them together . Well you know rough and stumble stock cars they got knocked off but other than that I don't recall any melting apart including...

Brass melts at around 16-1700 degrees F so it's unlikely a saw muffler would get that hot .That's bright orange ,300 degrees hotter than the point where tool steel becomes non magnetic. More times than not it's more the technique rather than the braze that fails .You about need a lap joint of...