Static Performance and Fracture Numerical Analysis of 301L/Q235B Dissimilar Steel Resistance Spot Welded Joints |
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Authors: | Changkun Wang Huiyu Liu Jiafei Fan Yinlong Zuo Liguo Hu |
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Affiliation: | School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China ;China Railway Shanghai Design Institute Group Co., LTD., Shanghai 200070, China;CRRC Tang Shan Co., LTD., Tangshan 063000, China; CRRC Chang Chun Railway Vehicles Co., LTD., Changchun 130062, China |
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Abstract: | This paper presents an experimental study on the static tensile test of resistance spot welding between 2.0 mm thick dissimilar 301L-DLT and Q235B in tensile-shear specimens with different welding nugget diameters. Force-displacement curves of the specimens were compared with simulation curves by the finite element software. The stress-strain distribution and fracture evolution process during the tensile process were analyzed. The hardness of the nugget was higher than that of the base material and the heat affected zone. Under static tensile load, the stress and strain in the spot welded joints increased exponentially with the increase of displacement, and the maximum stress was located at the nugget edge of the 301L plate loading side. The static tensile strength and plastic deformation of the spot welded joint failure by the nugget pulled-out fracture mode was better than that by the interface fracture mode. The critical nugget diameter of Q235B for the transition from nugget interfacial fracture to the pull-out fracture was 7.12 mm, and that of 301L was 7.81 mm, which was about 5t. |
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Keywords: | 301L/Q235B dissimilar resistance spot welding static mechanical properties fracture mode finite element analysis |
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