STUDIES ON THE LASER SPOT WELDING OF STEEL/MAGNET DISSIMILIAR MATERIALS
The paper studies the laser spot welding of SPCC steel and NdFeB permanent magnet. Results show that during welding process the two metals quickly melt, mix and then solidify to form a weld that joins two specimens together. The hardness in the joint is not uniform: the heat affected zone (HAZ) has a lower hardness than NdFeB base metal; within the nugget, the region adjacent to the fusion line has the highest hardness while the middle part of nugget has the lowest hardness in the joint. Hot cracks are apt to occur at the interface between nugget and magnet base metal, whereat the cracks propagate and lead to joint failure during shear tests. The fracture is intergrannular and is a typical brittle fracture. To increase the joint strength and prolong the service life of welded components, it is necessary to take some metallurgical and technological measures to improve the bonding quality between nugget and magnet base metal.
NdFeB magnets laser spot welding dissimilar materials hot crack brittle fracture
Baohua Chang Shaojun Bai Xiaogang Li Yuquan Ding Hua Zhang Dong Du Yunhong Zhou
Department of Mechanical Engineering, Key Laboratory for Advanced Materials Processing Technology, T Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
国际会议
第三届太平洋国际激光与光学应用会议(PICALO 2008)
北京
英文
169-172
2008-04-16（万方平台首次上网日期，不代表论文的发表时间）