copper contamination vs bronze contamination when welding brviouls brazed maerial
copper contamination vs bronze contamination when welding brviouls brazed maerial
(OP)
thread330-293785: Copper Cracking of Welds talked some about copper contamination.
I've damaged some mild steel parts by welding, when the parts were previously bronze welded using commercilly available oxy acetylen brazing rod. It seemed like the old bronze diffused into the steel, and after oxy acetylene welding the steel became quite brittle and sometimes even cracked when cooling.
I think I'd read something long ago about "not welding previoiusl brazed parts" perhaps in one of the late great Carrol Smith "X to win" books
I was thinking that since OA rods are often copper plated it is probably NOT the copper that gave me the problem, but something else in the bronze recipe.
Articles like this one seem to focus on copper as a problem.
http://files.aws.org/wj/supplement/WJ_1982_03_s075...
I've damaged some mild steel parts by welding, when the parts were previously bronze welded using commercilly available oxy acetylen brazing rod. It seemed like the old bronze diffused into the steel, and after oxy acetylene welding the steel became quite brittle and sometimes even cracked when cooling.
I think I'd read something long ago about "not welding previoiusl brazed parts" perhaps in one of the late great Carrol Smith "X to win" books
I was thinking that since OA rods are often copper plated it is probably NOT the copper that gave me the problem, but something else in the bronze recipe.
Articles like this one seem to focus on copper as a problem.
http://files.aws.org/wj/supplement/WJ_1982_03_s075...





RE: copper contamination vs bronze contamination when welding brviouls brazed maerial
RE: copper contamination vs bronze contamination when welding brviouls brazed maerial
RE: copper contamination vs bronze contamination when welding brviouls brazed maerial
Depending on the alloys involved the problem may not be in the weld itself, but in the HAZ where it got hot enough to melt the second alloy. This is often where LME cracking will show up.
I have seen this in miss-handled SS tubes where they had some surface Cu (or brass) contamination prior to annealing. After annealing there were small through wall cracks.
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