Abstract
Most of the steel and aluminium based alloys can be welded by MIG welding process as it gives better mechanical properties and microstructure at optimized input parameters. Various researchers experimentally analysed the suitability of MIG welding for joining of wide range of alloys used in various applications. Process parameters of MIG welding are the important factors that influence the quality of the weld. The purpose of this review paper is to summarize the published literature related to different variants of MIG welding and to observe the influence of various input process parameters of MIG welding on microstructure, hardness, tensile strength and impact strength of the weldment. Results revealed that change in value of any of the parameters can significantly affect the weld properties. Welding current and welding speed are the most important among the principal input welding parameters. Lower welding voltage and gas flow rate and higher welding speed and wire feed rate results maximum ultimate tensile strength of the weldment. Better mechanical properties and reduced residual stresses obtained during Pulsed MIG as compared to conventional MIG or MAG welding. There is a better scope of research on mechanism of residual stresses and their correlation with microstructure and mechanical properties to improve the weld quality.
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