Relationship between pool characteristic and weld porosity in laser arc hybrid welding of AA6082 aluminum alloy

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• 作者：Chen Zhang^a ; ^b ; Ming Gao^b ; ^{mgao@mail.hust.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{zhangchentm@163.com" class="auth_mail" title="E-mail the corresponding author} ; Dengzhi Wang^b ; Jie Yin^b ; Xiaoyan Zeng^b
• 关键词：Laser arc hybrid welding ; Aluminum alloy ; Porosity ; Melt pool
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：217-222
• 全文大小：2370 K

文摘

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, Φ was then proposed by pool profiles to predict the percent porosity of hybrid welds. The higher the Φ, the easier the bubble escaping away the pool, and the lower the weld percent porosity. When the Φ was larger than 0.52, the weld percent porosity was less than 0.5%, which is the criterion of first grade weld.