The IUP Journal of Mechanical Engineering
Optimization of Process Parameters Influencing Lack of Fusion Defect in TIG Welding of SS 304 Thin Sheet

Article Details
Pub. Date : Nov, 2020
Product Name : The IUP Journal of Mechanical Engineering
Product Type : Article
Product Code : IJME11120
Author Name : Sumit D Bhatt, Sagarkumar I Shah and G D Acharya
Availability : YES
Subject/Domain : Engineering
Download Format : PDF Format
No. of Pages : 16



Tungsten Inert Gas (TIG) welding or Gas Tungsten Arc Welding (GTAW) process is widely used in many appliances due to its versatility in industry. For GTAW process, metal like stainless steel is widely used in all positions. Butt joint, lap joint, T-joint, edge joint and corner joint are the common types of joints used in welding. The incompletely fused spot ike porosity that occurs after welding is known as lack of fusion that leads to undesirable results, and to overcome this, changes in welding techniques and parameters within the limits are required. Nowadays, a large number of resources are used for reworking the welds. But it causes higher cost of production and delay in completing the work. Higher amount of rejection of product may occur if lack of fusion is not controlled physically during welding. The paper aims at predicting and reducing lack of fusion with TIG welding process parameters. Using design of experiment method, straight and indirect effects of the process parameters can be determined and process parameters can be optimized.


Tungsten Inert Gas (TIG) or Gas Tungsten Arc Welding (GTAW) process is most commonly used in industry, which uses a nonconsumable tungsten electrode. It is protected by inert gases like argon or helium gas. Inert gas is used for arc shielding in order to prevent air from contaminating the weld. This shielding gas prevents oxidation of the tungsten electrode, the molten weld puddle and the heat affected zone adjacent to the weld bead. Mostly, argon gas is used as inert gas by industry because it is less costly than helium gas. TIG welding is very useful to weld thin sheets of metallic and nonmetallic material.


TIG welding, SS 304, Lack of fusion, Process parameter, Design Of Experiment (DOE)