Influence of process parameter on Lack of Fusion in T.I.G. welding of S.S. 304 – A Review

Abstract

 The T.I.G. welding or gas tungsten arc welding (GTAW) process is widely used in many appliances because of its versatility in industry. For GTAW process, metals like carbon steel, stainless steel, aluminium, copper, low-alloy steel and non-metal also are widely used in all positions. Butt joint, lap joint, T-joint, edge joint, corner joint are the common types of joints used in welding. The incompletely fused spots like porosity that occurs after welding is known as lack of fusion that leads to undesirable results and to overcome this, it requires change in welding techniques and parameters within the limits. A large number of resources are used now a day for reworking the welds. But it causes higher cost of production and delay for completing the work. Higher amount of rejection of product may generate if the lack of fusion is not to be controlled physically during welding. This work is aimed to predict and reduce lack of fusion with TIG welding process parameters. Using various designs of experiments methods, straight and indirect effects of the process parameters can be determined and process parameters can be optimized.