Effect of external magnetic field on resistance spot welding of aluminum alloy AA6061-T6

被引：45

作者：

Huang, Ming ^{[1
]}

Zhang, Qingxin ^{[1
]}

Qi, Lin ^{[1
]}

Deng, Lin ^{[1
]}

Li, Yongbing ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Digital Manufacture Thin Walled, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, State Key Lab Mech Syst & Vibrat, Shanghai 200240, Peoples R China

来源：

JOURNAL OF MANUFACTURING PROCESSES | 2020年 / 50卷

基金：

中国国家自然科学基金;

关键词：

External magnetic field; Resistance spot welding (RSW); Aluminum alloy; Electromagnetic stirring (EMS); Microstructure evolution; Mechanical performance; QUANTITATIVE-EVALUATION; ELECTRODE; MICROSTRUCTURE; NUGGET; POOL;

D O I：

10.1016/j.jmapro.2020.01.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An external magnetic field is applied in resistance spot welding (RSW) of 3 mm thick AA 6061-T6 sheets to improve the weld quality. Under the action of the external magnetic field, an additional circumferential flow is generated, resulting in the reduction of cooling rate and the change of solidification mode, and it finally influences the nugget profiles, microstructural evolutions, and mechanical properties. The profile of the magnetically assisted resistance spot welding (MA-RSW) nugget became more regular and freer of defects, e.g., the internal shrinkage defects and eyelash-like hot cracks. Moreover, a double-layered columnar grain zone and a nearly single-structured equiaxed grain zone were finally obtained. The tensile properties of the MA-RSW welds were significantly improved by increasing nugget diameter, eliminating defects, and complicating the crack propagation path. As a result, the application of the external magnetic field could achieve an energy-saving effect.

引用

页码：456 / 466

页数：11