FIELD: construction industry. SUBSTANCE: flat strip of metal is passed through cold-rolling mill to form wall and hollow shoulders arranged along opposite sides of wall. Then free edges of hollow shoulders are welded by electric high-frequency welding. In this case mentioned free edges of hollow shoulders are welded with the use of induction resistance welding to plane of wall near proper joints between wall and hollow shoulders to form integral butt joint between metal of free edges of hollow shoulder and metal of wall. EFFECT: enhanced functional efficiency and reliability of process. 7 cl, 20 dwg
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