Abstract: The present invention relates to a stretch controlled forming mechanism and method for preventing uncontrolled stretching, wrinkling, or splitting of welded blanks. Specifically, a stretch controlled forming mechanism is provided that, in accordance with the present invention, locks the welded blank between opposed die surfaces along the seams where the different gauge materials of the blank are welded together. Such locking prevents continued flow of material in the welded areas during the remainder of the formation process. Thus, with the jointed areas restricted from further material flow, the portion of the welded blank not previously formed can be formed between opposed dies, without damage to the welded seams or the lower gauge material of the welded blank.