FIELD: technological processes.
SUBSTANCE: group of inventions can be used in production of weld joints of steel sheets, one or more of which is high-strength steel sheet with tensile strength of 750–2,500 MPa and carbon equivalent Ceq of which is 0.20–0.55 wt%. In square area with side of 30 mcm located in zone of thermal influence in high-strength steel sheet S1, which is the main material, value of width of blocks consisting of rack martensite is limited. During welding electric current is passed through superimposed steel sheets by means of welding electrodes and steel sheets are heated with maintenance of heating temperature of high-strength steel sheet S1 corresponding to temperature Ms or more. Heating of the sheets to be welded is controlled to maintain the preset temperature in the said square area.
EFFECT: weld joint produced by spot welding has high strength at transverse tension.
4 cl, 9 dwg, 2 tbl, 1 ex
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