期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 240, 期 -, 页码 217-222出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2016.10.001
关键词
Laser arc hybrid welding; Aluminum alloy; Porosity; Melt pool
资金
- National Natural Science Foundation of China [51275186, 51475183, 51429501]
- Postdoctoral Science Foundation of China [2015M572138]
Effects of welding parameters on the porosity of laser arc hybrid welded AA6082 aluminum alloy were investigated. The percent porosity was examined by X-ray non-destructive testing. The pool shapes were characterized by weld transverse and longitudinal profiles, which were observed by optical and scanning electron microscopes with elemental tracer technique, respectively. Under optimized welding parameters, the weld porosity could be reduced to less than 0.5%. It was found that the pool shape characteristics were closely relative to weld porosity. A volume characteristic coefficient, Phi was then proposed by pool profiles to predict the percent porosity of hybrid welds. The higher the Phi, the easier the bubble escaping away the pool, and the lower the weld percent porosity. When the Phi was larger than 0.52, the weld percent porosity was less than 0.5%, which is the criterion of first grade weld. (C) 2016 Elsevier B.V. All rights reserved.
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