Effects of welding parameters on bead formation of laser welding under subatmospheric pressures

被引：0

作者：

Luo, Yan ^{[1
]}

Tang, Xinhua ^{[1
]}

Lu, Fenggui ^{[1
]}

Chen, Qintao ^{[1
]}

Cui, Haichao ^{[1
]}

机构：

[1] Shanghai Key Laboratory of Laser Processing and Material Modification, Shanghai Jiaotong University

来源：

Zhongguo Jiguang/Chinese Journal of Lasers | 2014年 / 41卷 / 06期

关键词：

Laser technique; Laser welding; Local subatmospheric pressure; Molten pool; Plasma plume; Weld penetration;

D O I：

10.3788/CJL201441.0603008

中图分类号：

学科分类号：

摘要：

Deeper penetration depth and less pore sensitivity are the advantages of laser welding in vacuum. In order to make use of these advantages and eliminate the size limit of workpiece by the vacuum chamber as well, a new vacuum chamber is designed which can maintain a subatmospheric pressure above the welding molten pool. The chamber is fixed on the laser nozzle and the relatively lower pressure is generated with a vacuum pump. A series of spot welding and continuous welding experiments are taken under subatmospheric pressures. The results are compared with the weld bead under normal atmosphere with and without side-blowing shielding gas. The behaviors of plasma plume and molten pool are observed by the high-speed camera. The results show that the plasma plume is suppressed obviously and the penetration depth increases under subatmospheric pressure in spot laser welding. The penetration depth of spot weld bead is 4.5 mm deeper at most than the weld bead with side-blowing shielding gas. During continuous laser welding under subatmospheric pressure, the keyhole closed at the rear of the molten pool, the molten metal stacks backwards and sound weld can be achieved. The penetration depth of weld bead under subatmospheric pressure is averagely 2 mm deeper than the weld bead in normal atmosphere with side-blowing shielding gas.

引用

共 12 条

[1]

Mei L., Chen G., Jin X., Et al., Study on fiber laser overlap-welding of automobile aluminum alloy, Chinese J Lasers, 37, 8, pp. 2091-2097, (2010)

[2]

Wang W., Zhang Y., Cui Z., Et al., Study on microstructure and properties of double ultra-thin stainless steel clad plate by laser welding, Chinese J Lasers, 38, 5, (2011)

[3]

Huang J., Li Z., Tang X., High-power laser welding of plate, Aeronautical Manufacturing Technology, 2, pp. 26-29, (2010)

[4]

Wu S., Xiao R., Chen K., Laser welding of heavy section stainless steel plants, Chinese J Lasers, 36, 9, pp. 2422-2425, (2009)

[5]

Vollertsen F., Thomy C., Welding with fiber lasers from 200~17000 W, pp. 254-263, (2005)

[6]

Wang C., Meng X., Huang W., Et al., Role of side assisting gas on plasma and energy transmission during CO<sub>2</sub> laser welding, Journal of Materials Processing Technology, 211, 4, pp. 668-674, (2011)

[7]

Zhang Y., Li S., Jin X., Et al., Research key technology of laser welding of galvanized steel, Laser & Optoelectronics Progress, 47, (2010)

[8]

Arata Y., Abe N., Oda T., Et al., Fundamental Phenomena During Vacuum Laser Welding, International Inst of Welding London, (1985)

[9]

Verwaerde A., Fabbro R., Deshors G., Experimental study of continuous CO<sub>2</sub> laser welding at subatmosphericpressures, J Appl Phys, 78, 5, pp. 2981-2984, (1995)

[10]

Katayama S., Kobayashi Y., Mizutani M., Et al., Effect of vacuum on penetration and defects in laser welding, J Laser Appl, 13, 5, pp. 187-192, (2001)

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