A STUDY ON THE WELD BEAD CHARECTERISTICS IN PULSED GAS METAL ARC WELDING WITH ROTATING ARC

摘要

Pulsed Gas Metal Arc Welding is widely used in industries because of its high productivity. The bead geometry obtained in welding steel is far from ideal and needs to be improved. It is experimentally observed that the beads are either convex or the penetration is deep and narrow. Both these conditions are undesirable. Proper selection of pulse parameters can improve the wetting, but the penetration remains finger type penetration. An arc rotation mechanism is developed which can be adapted to any conventional GMA welding torch. The beads deposited with rotating arc are flat and the penetration is semi-circular. It is observed that the penetration is maximum only at a particular rotating arc speed.