I used to work with a guy that build dragster chassis. First his technique was really good so he never put too much heat into any one weld. Being consistent he just moved from side-to-side and top to bottom as he welded on the chassis. You could see tubes pull away from the table but when he went to the other side it would pull back in alignment. I suspect he occasionally had to use a torch to straighten out a little warpage, but overall his consistency and balance side-to-side was all that it took. It also helped that the fit was very good and consistent. Obviously if one tube had a large gap it would pull differently than a tube with a perfect gap.
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