Abstract
Corten A588 grade steel is a weathering with low carbon content less than 0.2%. It is a high strength low alloy steel with exceptional corrosion resistant property. Hence Corten A588 grade steel is used in various applications like construction of bridges, roof and side walls of buildings, shipping containers, rail wagons etc. During fabrication work, when the Corten A588 steel is welded, it gets exposed to very high temperatures. Due to these few elements having low melting point in the Corten A588 steel base metal gets vaporized, thereby changing the crystalline nature and phases i.e. metallurgy of the steel. The effects of GTAW (Gas Tungsten Arc Welding), GMAW (Gas Metal Arc Welding), LBW (Laser Beam Welding) and AGTAW (Autogenous Gas Tungsten Arc Welding) based on the heat input and various other welding parameters are investigated analysed and compared. In this research GTAW, GMAW, LBW and AGTAW Corten A588 grade steel weldments were prepared and XRD test is performed to investigate the crystalline structure of the weldments. The d-spacing, phase identification, full width at half maximum (FWHM), crystalline size is studied and a comparative analysis of all the four different weld which meliorates the mechanical, corrosion and metallurgical nature of the Corten A588 is made.
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