A REVIEW ON WELDING CHARACTERISTICS OF Cr–Mn AUSTENITIC STAINLESS-STEEL USING SMAW AND GMAW WELDING PROCESSES

1)               Tensile strength decrease with increase in welding speed in both GMAW and SMAW on Ultra Low Nickel Cr-Mn ASS (ULASS). The Tensile strength is found highest in SMAW at Low Welding Speed (LWS) of 3mm/s.The Ferritscope test reveals that ferrite Content in the Weld Metal is increasing with the increase in welding speed. SMAW posses higher ferrite content then GMAW. 2)               Microstructure examination of weld zone shows dendrites of δ ferrite in both the processes. The Heat Affected Zone (HAZ) is decreasing with the increase in welding speed.    3)               The impact Values decreases with the increase in welding speed in both GMAW and SMAW on Ultra Low Nickel Cr-Mn ASS (ULASS). At Low Welding Speed (LWS) the Impact values are highest. 4)               The DLEPR results reveal that SMAW and GMAW welded joint are susceptible to Intergranular corrosion of welded joints. Welding of Ultra low nickel Cr-Mn Austenitic stainless steel (ULNASS) with GMAW is more susceptible to intergranular corrosion attack as compared to SMAW. Sensitization decreases with increase in welding speed. However, both SMAW and GMAW are more susceptible to IGC as compared to Base Metal. 5)               The hardness is decreasing with the increase in welding speed in both the SMAW and GMAW. The Hardness at Heat Affected Zone (HAZ) is increasing with decrease in welding speed. In both the processes the hardness at the weld zone is less than the hardness at the base metal.

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