Reduction of valve scrap in plasma transferred ARC welding

Abstract

Welding processes often appear to consume greater fractions of the product cost and to create more of the production difficulties than might be expected. The plasma transferred arc welding is used to weld the head of the exhaust valve. Due to this welding deposit crack and deposit unfill occurs in the exhaust valve. In PTA machine some parameters occurs like power rate, torch angle, gas flow.The main scope is to identify the major reason for rejections that occurred in Plasma Arc Welding of IC engine valve components. By controlling the runout in PTA machine input job and by changing the parameter in PTA machine the scrap is reduced from 10.3% to 2.1% in deposit crack and from 10% to 0.81% in deposit unfill.