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Proceedings Paper

Effects of gap width on droplet transfer behavior in ultra-narrow gap laser welding of high strength aluminum alloys
Author(s): Chaoqun Song; Shiyun Dong; Shixing Yan; Jiawu He; Binshi Xu; Peng He
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Paper Abstract

Ultra-narrow gap laser welding is a novel method for thick high strength aluminum alloy plate for its lower heat input, less deformation and higher efficiency. To obtain a perfect welding quality, it is vital to control the more complex droplet transfer behavior under the influence of ultra-narrow gap groove. This paper reports the effects of gap width of groove on droplet transfer behavior in ultra-narrow gap laser welding of 7A52 aluminum alloy plates by a high speed camera, using an ER 5356 filler wire. The results showed that the gap width had directly effects on droplet transfer mode and droplet shape. The droplet transfer modes were, in order, both-sidewall transfer, single-sidewall transfer, globular droplet transfer and bridging transfer, with different droplet shape and transition period, as the gap width increased from 2 mm to 3.5mm. The effect of gap width on lack of fusion was also studied to analyze the cause for lack of fusion at the bottom and on the sidewall of groove. Finally, with a 2.5 mm U-type parallel groove, a single-pass joint with no lack of fusion and other macro welding defects was successfully obtained in a single-sidewall transfer mode.

Paper Details

Date Published:
PDF: 6 pages
Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 1045713; doi: 10.1117/12.2283475
Show Author Affiliations
Chaoqun Song, Harbin Institute of Technology (China)
Academy of Armored Forces Engineering (China)
Shiyun Dong, Harbin Institute of Technology (China)
Academy of Armored Forces Engineering (China)
Shixing Yan, Academy of Armored Forces Engineering (China)
Jiawu He, Academy of Armored Forces Engineering (China)
Binshi Xu, Harbin Institute of Technology (China)
Academy of Armored Forces Engineering (China)
Peng He, Harbin Institute of Technology (China)


Published in SPIE Proceedings Vol. 10457:
AOPC 2017: Laser Components, Systems, and Applications
Shibin Jiang; Lijun Wang; Lan Jiang; Long Zhang, Editor(s)

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