FLASH BUTT WELDING METHOD

摘要

PURPOSE:To obtain a weld zone of high quality small in deterioration of toughness of the weld zone by maintaining high current density at the time of upsetting and performing upsetting while melting the whole end faces to be joined. CONSTITUTION:A steel material in which temperature near the end face to be joined is T0 deg.C is flashed and upset to form a joint. When final flashing speed is V(mm./sec), current density I(A/mm.<2>) at the time of upsetting is made greater than the value solution shown in the equation, and the platen is displaced at an average speed higher than 50mm./sec while melting the end face of the member to to joined. Final upsetting at the time of cutting off of upset current is performed at low pressing force of <=5kg/mm.<2> while discharging only the molten metal in which forming is in progress.