Study on the Shear and Tensile Mechanical Properties of Q350EWR1 Weathering Steel Plug Welding Joints for Carbody

doi:10.3901/JME.260114

Abstract

Abstract: In order to investigate the performance problem of the plug-welded joints of the new generation of high-corrosion resistant weathering steel Q350EWR1 for the carbody of rail vehicles, six kinds of plug-welded joint specimens were designed, and the metallographic, hardness and monotonic tensile shear tests were carried out, and the effects of plate thickness, weld hole diameter, solder joint arrangement and the number of solder joints on the shear tensile properties of the joints were analyzed according to the test results. The results show that the tensile failure forms of single-point welding specimens are mainly typical interface fracture, pull-out fracture and mixed fracture, while the multi-point welding specimens change with the increase of the number of solder joints and the change of solder joint arrangement, mainly including the ductile fracture of the base metal along the 45° angle and the pull-out of the solder joint. The tensile load of the specimen increases with the increase of the hole diameter of the plug weld, and the failure modes of the specimens do not show obvious changes compared with those of the small plug weld specimens, with pull-out fracture being the main failure mode. With the increase of the number of solder joints, the failure mode changes from solder joint failure to base metal failure, and the tensile load of the sample also increases. The plate thickness has little effect on the shear tensile properties of the plug welded joint. As for the multi-joint arrangement, the failure mode of the solder joint arranged perpendicular to the force direction is close to that of single-point welding, but the tensile load is about 2 times that of single-point welding, and the specimen breaks at the solder joint, while the specimen with the solder joint arranged parallel to the stress direction has a significantly higher stiffness, and the specimen breaks at the base metal. The results of this study can serve as a reference for the design and implementation of Q350EWR1 plug welding structure and welding process of rail vehicles.

Key words: Q350EWR1, plug welding, tensile shear performance, F-δ curve, pulling and cutting damage

CLC Number:

U260
TG115

AN Xiao, WANG Yuanzhi, XIAO Shoune, YANG Bing, YANG Long, YANG Guangwu, ZHU Tao. Study on the Shear and Tensile Mechanical Properties of Q350EWR1 Weathering Steel Plug Welding Joints for Carbody[J]. Journal of Mechanical Engineering, 2026, 62(4): 157-167.

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