Investigation of welding parameters effect on welding distortion of conventional gas metal arc welding (GMAW) and cold arc

Azman, Syarmine Afiqah (2018) Investigation of welding parameters effect on welding distortion of conventional gas metal arc welding (GMAW) and cold arc. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study deals with the arc welding operation of thin plate with different thickness. The aim of this study is to determine the suitable welding process to be applied in automotive industry by comparing the effect of welding parameters on the tensile properties and macrostructure of welded specimen of Gas Metal Arc Welding (GMAW) and cold arc process. At the same time, the design and fabrication of welding jigs also involve clamping workpiece with the thickness up to 0.8 mm. Clamping design and common welding jigs material was studied in order to design and generate concept for the GMA W welding jigs. On the other hand, a planning matrix of the welding parameters which is arc current, arc voltage and welding speed was developed by Response Surface Method (RSM). RSM is chosen to give the best optimization parameters and a clear link between parameters and response. The length of welding distortion of the welded specimen which is cut with required dimension for both processes were measured by using CNC Coordinate Measuring Machine. The distortion length is useful to investigate the strength of bonding of the material between GMAW operation with or without the use of low arc current.

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