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. Abstract The newly developed super ductile duplex stainless steel (SDSS) has good strength and ductility, and itcan be used to reduce weight and improve the fabrication efficiency of a carbody of a rolling stock. In this study,spot weldability tests were conducted to take advantage of SDDSS in a carbody for an intermodal tram. Specimensof various thickness (0.4 to 5.0 mm) were prepared to find the proper welding conditions, and tensile load tests wereconducted to evaluate the tensile-shear strength of spot welded joints. Then, nugget diameters were measured to verify the quality. The tensile-shear strength was found to be proportional to the heat parameter. It was verified that thetensile-shear strengths and nugget sizes of the joints satisfy the standard requirements. The overall weldability testsconfirmed that SDDSS can be used effectively for the carbody of an intermodal tram.Keywords : Carbody, Nugget Diameter, Spot Welding, Super Ductile Duplex Stainless Steel, Tensile-shear strength, Tram, Weight reduction

A study on the applicability of newly developed stainless steel for weight reduction of carbody of intermodal tram