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<blockquote data-quote="CedarRiverScooter" data-source="post: 451455" data-attributes="member: 15465"><p>Your weldor friends are correct, the local distortion is a sign of a good weld.</p><p></p><p>Th physics of this are that aluminum expands greatly when heated, & during welding it gets heated to about 1500 degrees - but just a zone about 1/4 inch wide. So that zone expands more than the surrounding material. Something has to move! Add to that the extra rigidity of the member being attached. That will pull in a different way when this is all cooling off.</p><p></p><p>I had welds (I made) look great & just pop apart due to trying to not let get hot. Doesn't work!</p></blockquote><p></p>
[QUOTE="CedarRiverScooter, post: 451455, member: 15465"] Your weldor friends are correct, the local distortion is a sign of a good weld. Th physics of this are that aluminum expands greatly when heated, & during welding it gets heated to about 1500 degrees - but just a zone about 1/4 inch wide. So that zone expands more than the surrounding material. Something has to move! Add to that the extra rigidity of the member being attached. That will pull in a different way when this is all cooling off. I had welds (I made) look great & just pop apart due to trying to not let get hot. Doesn't work! [/QUOTE]
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