Originally posted by warmonger:
Also, you can hammer your pipes when just warm to fit the shape of your flanges as it makes it easier to work with. Work hardening from hammering will make the metal a bit tougher, but when you weld it the stress will relax anyway as it cools in ambient air temps. Saves some time.

After cold working the metal, I stress releaved it by warming and then letting room cool.

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