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Old 03-10-2005, 12:16 PM
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Welds: water or nat. cool=less shrinkage?

I was wondering IF it make's ANY difference in the amount of shrinkage if you cool a weld in a panel with a wet rag vs. just letting it cool on it's own?
We use a rag for shrinking and such and was curious as to it's "effect" on a panel weld sucking up more.

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Old 03-10-2005, 01:21 PM
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I never cool a weld with water. My impression is that it makes the panel a little more difficult to hammer and dolly, and certainly does not stop shrinkage...it seems to make the metal contract faster than natural cooling...there is no advantage in this.

John www.ghiaspecialties.com
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Old 03-10-2005, 01:43 PM
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Water cooling is a good way to crack a weld..Might not show up until the paint is on resulting in a callback..

OMT
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Old 03-11-2005, 05:52 AM
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When you heat something it expands, the rate at which it cools will determine how much it shrinks. It you want to harden something it needs to be cooled quickly. You're best off not quenching your welds if you want to keep them workable/soft. I sometimes use compressed air around the weld area but not directly on the welds, or attach a heatsink near the weld to absorb the heat while welding. JMO
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Old 03-11-2005, 07:35 AM
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Oh, I understand the effect of water on a weld.

I was "experimenting" on some scrap cooling with a DAMP rag to see if I could speed things up some and noticed that the panel did suck together more and had more concave warpage to it than the one that cooled naturally.

Thanks for the input. Mike.
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