Microstructure and Mechanical Properties of Thin-walled H65 Brass Pipe Welded Joint by High Frequency Induction
CAI Yan1,2, ZHOU Lei1,2,YE Feng1,2, ZHANG Yanyu1,2, XIE Zhixiong1,2,*, DONG Shijie1,2,3, TAN Fenfang3, XIE Jianying4
1 Hubei Key Laboratory of Green Light Industrial Materials, Hubei University of Technology, Wuhan 430068, China 2 Hubei Longzhong Laboratory, Xiangyang 441000, Hubei, China 3 School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China 4 Wuhan Botal New Materials Technology Co., Ltd., Wuhan 430058, China
Abstract: The microstructures and mechanical properties of high-frequency induction welded joints of thin-walled H65 brass pipe were studied. The results show that high frequency induction welding technology used to weld H65 brass pipe can obtain well-formed welds on the surface and achieve high-quality welding. The fusion zone and heat affected zone of the welded joint are shaped like a waist drum, which with a narrow waist. The width of the welded joint and the fusion zone is about 173 μm and 15 μm, respectively. The microstructure of the fusion zone is composed of numerous small equiaxed grains and a small amount of strip grains. The grains in the fusion zone and heat affected zone are refined compared with the base metal. The tensile strength of the welded joint is 400 MPa, which is 97.6% of the tensile strength of the base metal. The increase of the strength of the welded joint is due to the dislocation deformation hindered by the refinement of grains and the interaction of dislocations promoted by the phase orientation difference between grains in the process of tensile deformation. The fracture of welded joint occurs in the heat affected zone due to the offset between work hardening during welding and anneal softening after welding, and the fracture mode of welded joint is mainly ductile fracture. The microhardness of the welded joint shows a ‘ʌ’ shape distribution. The average hardness values of the fusion zone, the heat affected zone and the base metal is 145HV, 137HV and 129HV, respectively. The hardness of the fusion zone is increased by 16% compared with that of the base metal. The increase of the strength of the fusion zone is caused by the work hardening generated during welding.
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2024, Vol. 38 
