I can't answer for The Roadster Shop.... but I will say there are several things to take into consideration when welding almost anything. CLAMPING is critical... and all welding EXPANDS first - then shrinks / moves as it cools.... if you know this then you can weld in such a way as to pull the metal back into shape. Take a T weld -- you weld on one side - it pulls - you weld on the other side - it pulls back... Obviously this is oversimplification. CLAMPING - Then Tacking - Then skipping around so that you have counter forces working to help you.
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