WU Chaomei, LIU Fei, CHEN Tao.Study on Microstructure and Mechanical Properties of Copper/Tungsten Dissimilar Metal Cold Welded Joint[J].Electric Welding Machine, 2023, 53(6): 55-61.
WU Chaomei, LIU Fei, CHEN Tao.Study on Microstructure and Mechanical Properties of Copper/Tungsten Dissimilar Metal Cold Welded Joint[J].Electric Welding Machine, 2023, 53(6): 55-61. DOI: 10.7512/j.issn.1001-2303.2023.06.09.
Study on Microstructure and Mechanical Properties of Copper/Tungsten Dissimilar Metal Cold Welded Joint
With increasing requirements for the strength of metal materials, the performance of single metal materials has great limitations, and it is difficult to meet the growing needs of people. In recent years, the connection of Cu/W dissimilar metals has played an increasingly important role in the welding field. In this paper, Cu/W dissimilar metal welded joints are produced by cold welding technology. The results show that the cold welding current has an obvious influence on the forming of the joint. At 160 A, there are many holes and unwelded defects at the interface, and the fracture occurs at the interface junction. Undercut appears at 170 A, and pores gather near the fusion line in the weld, where the fracture occurs. At 180 A, the weld seam is formed more evenly, the interface bonding is compact, the diffusion degree of Cu and W is the largest, the joint strength is the highest, and the fracture occurs on the tungsten base metal. At 190 A, solder joints overlap and the connection area changes greatly. There are large pores at the interface and weld, and the quality of the weld is unstable. The joint strength first increases and then decreases with the increase of current, reaching a peak value of 77.78 MPa at 180 A, and the quality of the welded joint is the best. The hardness of tungsten side after welding is not significantly different from that before welding, and the hardness of weld is extremely low. The hardness of heat affected zone is between copper base metal and weld, and the hardness of interface decreases with the increase of current. Except for 170 A, the joint has no obvious softening zone under other current parameters.
关键词
铜/钨异种金属冷焊接头微观组织力学性能
Keywords
Cu/Wdissimilar metalscold weldingmicrostructure of welded jointmechanical property
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