期刊
8TH INTERNATIONAL CONFERENCE ON LASER ASSISTED NET SHAPE ENGINEERING (LANE 2014)
卷 56, 期 -, 页码 515-524出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.phpro.2014.08.006
关键词
laser beam welding; electromagnetic weld pool support; Hartmann effect; electromagnetic rectification
资金
- DFG (Bonn, Germany) [DFG GU 1211/2-1]
- German Allianz Industrie Forschung (AiF) [17.265N]
The objective of this study was to investigate the influence of externally applied magnetic fields on the weld quality in laser beam welding. The optimization of the process parameters was performed using the results of computer simulations. Welding tests were performed with up to 20 kW laser beam power. It was shown that the AC magnet with 3 kW power supply allows for a prevention of the gravity drop-out for full penetration welding of 20 mm thick stainless steel plates. For partial penetration welding it was shown that an 0.5 T DC magnetic field is enough for a suppression of convective flows in the weld pool. Partial penetration welding tests with 4 kW beam power showed that the application of AC magnetic fields can reduce weld porosity by a factor of 10 compared to the reference joints. The weld surface roughness was improved by 50 %. (C) 2014 Published by Elsevier B.V.
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