The microstructures and mechanical properties of dissimilar laser welding of copper and 316L stainless steel with Ni interlayer. (September 2021)

• Record Type: Journal Article
• Authors: Xin, Jijun; Zhang, Hengcheng; Sun, Wenjun; Huang, Chuanjun; Wang, Shanlin; Wei, Jing; Wang, Wei; Fang, Zhichun; Wu, Dong; Li, Laifeng
• Is Part Of: Cryogenics. Volume 118(2021)
• Publication Date: 2021-09
• Subjects: Dissimilar welding -- Interlayer -- Microstructure -- Mechanical properties; Low temperature engineering -- Periodicals; Low temperature research -- Periodicals; 536.56
• DOI: 10.1016/j.cryogenics.2021.103344
• Languages: English
• ISSNs: 0011-2275

Abstract

Highlights: The sound welded joint was obtained with Ni interlayer for 316L/Cu dissimilar laser welding joint. No welding defects and spherical particles were formed in the fusion zone. The average tensile strength of dissimilar welded joint is 408 MPa at 77 K. Abstract: To improve the quality of welded joints between copper and 316L stainless steel, laser welding with Ni interlayer was carried out. A sound welded joint was obtained and the microstructures as well as mechanical properties were investigated. Results indicate that no welding defects or spherical particles were formed in the fusion zone. The microstructures in the fusion zone were characterized as dendritic grains, and no macroscopic segregation was observed. The welded joint failed at copper base material with an average tensile strength of 408 MPa at 77 K, and ductile fracture mode with dimples on the fracture surface were presented. Moreover, the addition of Ni interlayer prevents formation of welding defects and spherical particles and improves mechanical properties of the joint.