Yeah that's if you get it too hot too fast. Learned this from a guy that made a living modifying straight trucks for a living, stretching frames or shortening them as well. Many, if not all, 2 ton trucks have a lengthened frame which always involves welding the frame. As long as the frame doesnt get too hot, it doesnt affect the tempering one bit. I've welded on several frames without any issues, welded the frame on my old '80 4x4, on the rear bolt of the front leaf spring where Chevys always bust. Over 3 years later and it's still running strong.
Your way too by the book, bear.
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