Pitting corrosion behavior in laser weld metals of 2205 DSS with continuous heat treatment was investigated by cyclic polarization tests in a 3.5%NaCl solution at room temperature. The results indicated their excellent pitting corrosion resistances in this chloride solution and wide passive regions were observed for all the welds tested. The results demonstrated that laser continuous heat treatment can decrease the problems such as excessive ferrite and intermetallic phases by controlling secondary austenite microstructure. The effects of varying higher heat input on microstructure, mechanical properties and pitting corrosion resistance also were discussed.
Non-penetration laser welding of lap joints in austenitic stainless steel sheets is commonly preferred in fields where the surface quality is of utmost importance. However, the application of non-penetration welded austenitic stainless steel parts is limited owing to the micro bulging distortion that occurs on the back surface of the partial penetration side. In this study, non-penetration lap laser welding experiments, were conducted on galvanized and SUS304 austenitic stainless steel plates using a fiber laser, to investigate the mechanism of bulging distortion. A comparative experiment of DC01 galvanized steel-Q235 carbon steel lap laser welding was carried out, and the deflection and distortion profile of partially penetrated side of the sheets were measured using a non-contact laser interferometer. In addition, the cold-rolled SUS304 was subjected to heat holding at different temperatures and water quenching after bending to characterize its microstructure under tensile and compressive stress. The results show that, during the heating stage of the thermal cycle of laser lap welding, the partial penetration side of the SUS304 steel sheet generates compressive stress, which extrudes the material in the heat-affected zone to the outside of the back of the SUS304 steel sheet, thereby forming a bulge. The findings of these experiments can be of great value for controlling the distortion of the partial penetrated side of austenitic stainless steel sheet during laser non-penetration lap welding.
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