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Chin. Opt. Lett.
 Home  List of Issues    Issue 01 , Vol. 04 , 2006    Influence of shielding gas pressure on welding characteristics in CO2 laser-MIG hybrid welding process


Influence of shielding gas pressure on welding characteristics in CO2 laser-MIG hybrid welding process
Yanbin Chen, Zhenglong Lei, Liqun Li, Lin Wu
State Key Laboratory of Advanced Welding Production Technology, [Harbin Institute of Technology], Harbin 150001

Chin. Opt. Lett., 2006, 04(01): pp.33-35-3

DOI:
Topic:Lasers and laser optics
Keywords(OCIS Code): 350.3390  140.3390  

Abstract
The droplet transfer behavior and weld characteristics have been investigated under different pressures of shielding gas in CO2 laser and metal inert/active gas (laser-MIG) hybrid welding process. The experimental results indicate that the inherent droplet transfer frequency and stable welding range of conventional MIG arc are changed due to the interaction between CO2 laser beam and MIG arc in laser-MIG hybrid welding process, and the shielding gas pressure has a crucial effect on welding characteristics. When the pressure of shielding gas is low in comparison with MIG welding, the frequency of droplet transfer decreases, and the droplet transfer becomes unstable in laser-MIG hybrid welding. So the penetration depth decreases, which shows the characteristic of unstable hybrid welding. However, when the pressure of shielding gas increases to a critical value, the hybrid welding characteristic is changed from unstable hybrid welding to stable hybrid welding, and the frequency of droplet transfer and the penetration depth increase significantly.

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Received:2005/8/26
Accepted:
Posted online:

Get Citation: Yanbin Chen, Zhenglong Lei, Liqun Li, Lin Wu, "Influence of shielding gas pressure on welding characteristics in CO2 laser-MIG hybrid welding process," Chin. Opt. Lett. 04(01), 33-35-3(2006)

Note: Z. Lei is the author to whom the correspondence should be addressed, his e-mail address is leizhenglong77@hit.edu.cn.



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