Abstract
Metal Inert Gas welding is a fast, reliable and cost effective technique for joining of different ferrous materials and steels used in the construction of large structures like Fe410WA, IS2062, SS304, AISI1040 and AISI316 etc. To obtain better quality and performance of the steel welded joints, parameter optimisation of metal inert gas welding procedure and weld heat treatment process is carried out. In optimization work and studies, variables of GMAW process like welding voltage and current, speed of welding, WFR (rate of wire feed), GFR (rate of gas flow), type of gas used and effect of heat treatments are kept changing to get best combinations of input parameters for best quality of welded parts. The quality of welds is evaluated in terms of mechanical properties of welded joints like ultimate tensile and yield strength, elongation, microstructure, heat affected zone and defect free weld joints etc. Model and experimental studies are done in different combinations to get best combination of input parameters for steels. Studies by authors have identified the significance of input parameters in ascending order and some of them also quantified the optimal values of the input parameters. Pre and post weld heat treatment of structures is beneficial in improvement of mechanical and fatigue properties.
Highlights
MIGW and its synonyms like GMAW or metal active gas welding (MAG Welding) was developed around late 1940's
MIGW is comparatively easy for adjustment with robotic application and automation too, MIGW became a major element in industry nowadays
GMAW is inappropriate for outdoors for the reason that the flow of the adjoining atmospheric air will disperse the protecting inert gas flow and this will make process complicated, while diminishing the welding quality
Summary
MIGW and its synonyms like GMAW or metal active gas welding (MAG Welding) was developed around late 1940's This process was evolved to accelerate welding process that was carried out by the Tungsten inert gas (TIG) Welding. GMAW is inappropriate for outdoors for the reason that the flow of the adjoining atmospheric air will disperse the protecting inert gas flow and this will make process complicated, while diminishing the welding quality . This concern can be eliminated or minimized by escalating the shielding gas flow making process costlier. This paper is an overview on the experimental and simulated optimization [1] of welding parameters performed with steel material
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