Weld formation mechanism of fiber laser oscillating welding of dissimilar aluminum alloys. (December 2020)

• Record Type: Journal Article
• Authors: Chen, Cong; Xiang, Yunzhong; Gao, Ming
• Is Part Of: Journal of manufacturing processes. Volume 60(2020)
• Page Start: 180
• Page End: 187
• Publication Date: 2020-12
• Subjects: Laser oscillating welding -- Aluminum alloys -- Oscillating frequency -- Oscillating amplitude -- Weld formation; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2020.10.050
• Languages: English
• ISSNs: 1526-6125

Abstract

Highlights: The weld formation in laser oscillating welding of 6061/2A12 dissimilar aluminum alloys was developed. Laser induced breakdown spectroscopy (LIBS) was used to detect the distribution of copper in weld section. The effect of oscillating frequency and amplitude on weld formation was obtained, and their optimized value were acquired. The weld segregation was improved in laser oscillating welding, which was expressed by the mixing uniformity. When increasing oscillating frequency or amplitude, the stirring intensity of molten pool was increased. Abstract: The development of high power galvanometer provides an opportunity to improve the weld formation of dissimilar aluminum alloys. In this paper, the influence of oscillating frequency and amplitude on weld formation of 6061/2A12 aluminum alloys was studied. Laser induced breakdown spectroscopy (LIBS) was used to detect the distribution of copper in weld section to explore the flowing of melting pool. The results showed that weld morphology became smooth and uniform with the increase of oscillating frequency and amplitude, reaching the optimized at frequency of 200 Hz and amplitude of 0.4 ∼1.2 mm. The front weld width increased and the backside weld width decreased gradually with the oscillating frequency and amplitude increased. The weld segregation was improved in laser oscillating welding, expressed by the mixing uniformity. It was mainly depended on oscillating frequency, and increased with the oscillating frequency increased. When increasing oscillating frequency or amplitude, the stirring intensity of the melting pool was increased. The melting pool was accelerated and mixed more evenly. Thus, the Cu is evenly distributed in the weld, and it can be detected on the side near 6061 base material.