FIELD: metal processing.
SUBSTANCE: invention relates to metal forming and can be used in producing complex large-size seamless parts. Prior to forming blank form three sheets of various nominal thickness and grades is welded along vertical, horizontal or inclined to horizontal two straight or curved lines. Wherein strength of the first sheet from which most strained section of part is stamped, is more than strength of the second and third sheets from which less strained sections of part are stamped. Welding line location shall correspond to calculated and experimentally obtained requirements for strength, rigidity and possibility of drawing on given depth without destruction of three sections of part surface, which are stamped from these three welded sheets.
EFFECT: higher quality of parts made of welded blanks.
9 cl, 7 dwg
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