Anyone have any ideas as to why the part towards me fuses fine with no filler and doesn’t leave any cracks 8/10, whereas the part on the far side leaves a crack every single time with no filler, seems just about the same clearances/tolerances, really odd. Any input would be appreciated. Trying to weld both in the same program rather than setting up a chuck to center a part at a time and using filler.
Tig Weld Crack (no filler)
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Chase -
June 23, 2021 at 7:08 AM -
Thread is marked as Resolved.
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Here’s the part with no crack
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Here’s the part with a crack every time.
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I suspect they may be just two dissimilar metals that don’t want to join. Even mig welded by hand and tig welded by hand leave a crack after grinded down slightly.
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Dissimilar metals seem to cool at different rates. Pre and post heat may help. You may have to add filler designed for this type of application.
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If you want some help, you need to give more infos. Which materials?
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Well, one is a tube, and the other appears to be a solid rod. That rod will suck up more of the heat than a tube. You have different heat input dynamics. Could be dissimilar metals as well.
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Thanks everyone for the help! We took all the pieces to our metallurgist, sure enough the rod had a high lead content, meant for being machined easy, not welded. The tube came back as a low carbon content steel, which is why that had a much easier time fusing to the base plate. The rods registered as 12L14, which are going to be replaced by low carbon steel rods. Thanks again