FIELD: flash-butt welding of parts with large cross section.
SUBSTANCE: method comprises steps of measuring during flashing off and upsetting, relative motion current values of welded parts, welding electric current and welding voltage; performing upsetting during two stages; at first stage upsetting at supplying voltage; at second stage upsetting without supplying voltage; at termination of flashing process calculating mean value of welding electric current or mean value of electric power as result of multiplication of calculated mean values of welding electric current and welding voltage; lowering voltage from time moment of beginning first stage of upsetting till time moment of beginning second stage of upsetting in such a way that to provide current value of welding electric current or current value of electric power as result of multiplication of current values of welding electric current by welding voltage in range 0.8 - 1.0 of calculated mean value of welding electric current or mean value of electric power at time moment of termination of flashing off.
EFFECT: improved quality of welded joints, lowered designed power of welding equipment.
3 dwg, 2 tbl
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