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Analysis of weld pool vibration characteristics in pulsed gas metal arc welding
吕小青, 张鹏, 沈俊1,2
1.1. ;2.
2.
摘要:
Using highspeed camera image measuring and processing, the contour of the weld pool was extracted accurately in pulsed metal inert gas (P-MIG) welding. Based on this extraction method, time and frequency domain characteristics at different points along the contour of the weld pool were analyzed for one pulse one droplet and one pulse two droplets, respectively. The results show that, because of the wave super position that was created by the pulsed arc and droplet impacting the weld pool, the oscillation amplitude along the weld pool fluctuated and decreased with an increase in distance from the point to the arc center. The oscillation near the arc center was complex and intense for one pulse two droplets, and the amplitude were relatively small because the oscillation caused by the pulsed arc could be offset by the molten droplet impact. The weld pool oscillation that was caused by the pulsed arc was stronger than that caused by the droplet.
关键词:  pulsed metal inert welding|weld pool oscillation|interference|time domain chart|frequency domain chart
DOI:10.12073/j.cw.20190709002
分类号:
基金项目:
Analysis of weld pool vibration characteristics in pulsed gas metal arc welding
Xiaoqing Lü, Peng Zhang, Jun Shen1,2
1.1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2.
2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China
Abstract:
Using highspeed camera image measuring and processing, the contour of the weld pool was extracted accurately in pulsed metal inert gas (P-MIG) welding. Based on this extraction method, time and frequency domain characteristics at different points along the contour of the weld pool were analyzed for one pulse one droplet and one pulse two droplets, respectively. The results show that, because of the wave super position that was created by the pulsed arc and droplet impacting the weld pool, the oscillation amplitude along the weld pool fluctuated and decreased with an increase in distance from the point to the arc center. The oscillation near the arc center was complex and intense for one pulse two droplets, and the amplitude were relatively small because the oscillation caused by the pulsed arc could be offset by the molten droplet impact. The weld pool oscillation that was caused by the pulsed arc was stronger than that caused by the droplet.
Key words:  pulsed metal inert welding|weld pool oscillation|interference|time domain chart|frequency domain chart