Double pulse welding method for twin-wire pulsed MIG welding

To improve the forming quality of twin-wire pulsed MIG welding, double pulse welding method for twin-wire pulsed MIG welding was proposed. A DSP based double pulse digital anti-phase synergic control system was constructed, with which surfacing welding experiments of single pulse and double pulse twin-wire pulsed MIG welding were conducted. Experimental results indicated that the process of double pulse welding was stably achieved on the constructed twin-wire pulse MIG welding system, and the weld seam formation was decent. By using metallographic analysis of the weld seams of single and double pulse test, it could be concluded that double pulse features a great stirring effect on the welding pool, and that as pillar dendrite crystal vanished, the crystal grain size of welding seam of double pulsed welding was smaller than that of single pulsed welding, demonstrating that the application of double pulse to twin-wire pulsed MIG welding brought about notable optimization.