期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 166, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.120759
关键词
Full penetration laser welding; Magnetic field support; Thermal fluid flow; Weld root hump suppression; multiple reflection
资金
- National Natural Science Foundation of China [51875353]
This study investigated the influence of alternating magnetic field on thermal fluid flow and weld root hump suppression in full penetration laser welding of aluminum alloy. Experimental and numerical analysis revealed that appropriate magnetic field parameters can effectively suppress the weld root hump and improve welding quality.
In this work, the influence mechanism of alternating magnetic field on the thermal fluid flow and weld root hump suppression in full penetration laser welding of aluminum alloy was studied. A novel three dimensional transient numerical model was developed, in which a multiple reflection laser beam model, a varied metallic vapor force model and an electromagnetic model including Lorentz force and Joule heat were considered. The experimental results indicated that when the effective magnetic flux density was 57 mT and its alternating frequency was 400 Hz, a sound weld bead for 10 mm plate could be obtained. The numerical analysis showed that the periodically varied electromagnetic force exerted an upward support to the weld pool, making its geometry and flow pattern stable. The keyhole collapse at upper and middle region was enhanced and the higher laser absorption was attributed to the decreased occurrence frequency of through-keyhole. The weld root sagging formation was instantaneous, while its suppression was a persistent process. The effect of weld root hump suppression depended on the dynamic competition among the electromagnetic force and the forces that promote the weld root sagging generation in the welding process. (C) 2020 Elsevier Ltd. All rights reserved.
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