MATHEMATICAL MODELING FOR PREDICTING ANGULAR DISTORTION IN TIG WELDING OF STAINLESS STEEL 409L BUTT WELDS

Ishika Aggarwal, Nimeshka Faujdar , Anusua Das , Pradeep Khanna

Abstract: TIG welding process has increasingly been used in the fabrication of ferrous and non-ferrous materials alike owing to its adaptability and ease of welding any known weldable material. The process also lends itself to automation, making it ideal for mass manufacturing industries. When automated, it can successfully weld autogenous joints. The process is largely used to weld thin gauge sheets. The present work is aimed to investigate the effects of controllable input parameters like welding current, welding speed and torch angle on the response parameters which is angular distortion of the resulting weldments in this case. An attempt has also been made to develop a mathematical equation relating input parameters to the response so that an optimized setting of these parameters can be obtained to have minimum possible angular distortion. Central composite face centered technique has been used to developed the mathematical model, whose adequacy has been tested by ANOVA analysis. Significance of the regression coefficients has been tested by t-test. Response Surface Methodology has been used for optimization of the developed model

Keywords: Autogenous, automation, response surface methodology, optimization, mathematical modeling

DOI: https://doi.org/10.15623/ijret.2018.0706013