EFFECT OF PROCESS PARAMETERS ON ANGULAR DISTORTION OF GMAW WELDED C45 PLATES

Rishav Kumar Jha, Ajay Kumar, Anubhav Chakraborty, Pradeep Khanna

Abstract: Gas Metal Arc welding process is one of the most expensively used arc welding process because of many advantages it offers like capability of welding a large variety of materials, adaptability to automation and versatility to weld out of position welds. Distortions in welded structures is inhabitable because of fast heating and cooling cycles resulting in non-uniform distribution of stresses which cause distortion. Out of different type of distortion angular distortion is the most prominent and results in dimensional change, mis match in the assembly and poor appearance. An investigation is thus carried out to analysis its generation under different combination of independently controllable input parameters. The input parameters found of importance are welding current, voltage, nozzle to plate distance and welding speed. Statistical technique of design of matrix was used to decide the no. of experiments. Design expert was in use to carry out the ANOVA analysis and to develop a mathematical model. Significance of model was tested and closeness of predicted and actual value by using a develop model were investigated by using scattered diagram. Response surface methodology was used to optimize the design.

Keywords: Angular distortion, design of experiments, ANOVA, Mathematical model

DOI: https://doi.org/10.15623/ijret.2018.0707022