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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Odd behaviour of brazed joint
Silver-soldered to be precise.
One of the bars of the stainless steel BBQ grill detached itself at one end from the stringer (I hope I am making myself clear, not too sure about the correct terminology). The spot weld simply gave way. I silver-soldered it back into place using Extra-Easy. On first inspection a good joint, could not force it apart. After several BBQ uses during which the grill is subjected to far less stress than when I was testing the joint, the latter gave way. I cleaned the whole thing with Dremel using a wire brush and sanding drum. I re-soldered the joint. Same wire, same flux, both work fine elsewhere. On testing the joint was fine but gave way again after 3 or 4 BBQ uses (the heaviest pressure on the grill is when cleaning it). I had a good look this time with a magnifying glass: The joint gave way on the bar, there seemed good adhesion on the stringer. I re-cleaned etc. and re-soldered with particular attention on heating the strut preferentially. I am waiting to see if I am third time lucky. What puzzles me that the joint would deteriorate with relatively light use. The BBQ temp does not reach anywhere near the melting point of Extra Easy (1150F). Is this a case of repeating heating and cooling cycles which stress the joint? Has anyone seen this elsewhere? Michael Koblic, Campbell River, BC |
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