期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 255, 期 -, 页码 841-852出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2018.01.041
关键词
Dual-spot laser welding; Single-spot laser welding; Keyhole stability; Melt flow dynamics; Computational fluid dynamics; Experimental validation
资金
- National Key Research and Development Program of China [2016YFB1102100]
- National Natural Science Foundation of China [51675129]
The keyhole is unstable with the presence of humps at the keyhole walls during single-spot laser welding (SSLW). The keyhole stability is improved and the presence of humps is reduced during dual-spot laser welding (DSLW). The vortices present at the rear keyhole wall during SSLW disappear during DSLW. There is an upward motion of the melt flow at the rear keyhole wall and the melt flow velocity is higher along the width of the molten pool during DSLW. A sandwich specimen is constructed to investigate the effect of keyhole and melt flow dynamics on the final shape of the weld seam. The results show that DSLW produces smoother, more regular weld beads due to higher stability of the keyhole and molten pool. DSLW produces a weld seam with fewer porosities and a more homogeneous nickel distribution due to the upward motion and absence of vortices in the melt flow. DSLW produces a wider molten pool due to the higher melt flow velocity along the width of the molten pool.
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