Effect of Powder Interlayer on Copper Alloy Lap Joint by Laser Welding
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ORIGINAL ARTICLE
Effect of Powder Interlayer on Copper Alloy Lap Joint by Laser Welding Banglong Yu1,2 • Jun Dai1,3
•
Li Yang1 • Zili Liu3 • Baojun Wang1 • Paul K. Chu4,5,6
Received: 5 November 2019 / Accepted: 7 August 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract In this paper, the lap joint of H62 copper alloy was carried out by pulsed laser welding. The effects of different powder interlayers on the microstructure, shear properties and corrosion properties of H62 copper alloy lap joints were studied. The results show that the welding joints with proper powder interlayer have achieved good welding forming. There are no defects such as pore and crack in the welding joints. The welding joints are fully penetrated with different powder interlayers except Ni powder interlayer. The grain size of weld is smaller than that of base metal. The maximum polar density of base metal is 6.46 in (001) [0–10] cubic texture, and there are two weaker (112) [111] Cu textures and (111) [1–21] textures. The maximum polar density of the weld is 5.39. The maximum position deflects, and (001) [0–10] cubic & Jun Dai [email protected] 1
School of Automotive Engineering, Changshu Institute of Technology, Changshu 215500, Jiangsu, People’s Republic of China
2
School of Mechanical and Electric Engineering, Soochow University, Suzhou 215021, People’s Republic of China
3
School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, People’s Republic of China
4
Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
5
Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
6
Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People’s Republic of China
texture disappears. The weld is confused compared with the base metal, and the grain distribution is basically of random orientation. The addition of Zn powder reduces the welding stress. The shear strength of welding joints with Zn powder interlayer is the best, 82.27 MPa, which is 18% higher than that of welding joints without powder. The corrosion resistance of welding joints with different powder interlayers is as follows: no addition [ Ni Powder [ Zn Powder [ Sn powder. Keywords Laser welding Copper alloys Microstructure Corrosion property EBSD
1 Introduction Copper and copper alloys are widely used in refrigeration, electric power, national defense and other industrial fields because of their excellent comprehensive properties [1, 2]. High-quality copper alloy welded joints are required [3, 4]. At present, the main welding methods of copper and copper alloys are arc welding, brazing, friction stir welding, cold press welding, etc. [5–8]. During the arc welding process, the joint properties of the copper alloy are reduced due to the occurrence of coarse grains and wide heat-affected zones [9, 10]. The brazing f
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