METHOD OF MANUFACTURING ARC WELDING BAR WIRE

摘要

The method improves drawability of wire rods for CO2 gas arc welding electrodes without annealing treatment by controlling the amound of bainite and martensite. The method comprises; (A) hot rolling a billet with 0.07-0.1% C, 0.85-0.95% Si, 1.45-1.65% Mn, after homogenization treatment at 1050-1100 deg.C for 2 hours; (B) quenching to 820-840 deg.C by water injecting; (C) coiling and cooling to 760 deg.C with cooling rate of 2.3 deg.C per second; (D) slow cooling to 635 deg.C with cooling rate of 0.74 deg.C per second; and (E) air cooling to room temperature.