How to weld sq tube together and keep it square

by tim

I am trying to weld two pieces of 2 inch sq tube 1/8 thick, at a 90 % angle. I square them tack them and then weld. When I finish they are out of line. Is it the heat that throws them out? Please help...


remember that the metal shrinks when it solidifies and cools. the joint will always try to draw inward. so either tack it with that in mind or weld in a direction that prevents drawing inward.

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