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Study on Plasma Behaviors and Induction Efficiency of Laser on Arc in Laser-Arc

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Laser-arc hybrid welding has the advantage of increasing welding efficiency and decreasing the welding energy consumption.

 

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Study on Plasma Behaviors and Induction Efficiency of Laser on Arc in Laser-Arc Hybrid Welding Process

Jipeng Shi Xinkun Xu Liming Liu*

Key Laboratory of Liaoning Advanced Welding and Joining Technology, School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;

 

   Abstract / 摘 要    

Laser-arc hybrid welding has the advantage of increasing welding efficiency and decreasing the welding energy consumption. In order to explain this phenomenon with physical principle, this paper studies the plasma behavior and induction efficiency on basis of experiments in low power pulsed laser-arc hybrid welding process. Due to the laser is in the form of pulses, the whole welding process can be divided into two alternate periods which are during laser action phase and after laser action phase. The plasma behaviors during laser action and after laser action is studied separately. During laser action, the addition of laser can make the arc pressure 5.2 times larger and increase the kinetic energy of the electrons in hybrid welding plasma by 27.5% than that in TIG welding. In hybrid welding process, the plasma almost vertically locates above the laser keyhole almost vertically and then connects to the electrode obliquely while it connects the base metal with the electrode aslant. After laser action, the plasma undergoes a relaxation time to recovery to its original state and the relaxation time, which relates to the plasma state, is calculated approximately. Finally, by calculating induction efficiency, it is found that the variation of induction efficiency under different parameters is quite similar to that of relaxation time.

   Key words / 关键词    

Hybrid welding; Induction efficiency; Plasma behavior; during laser action, after laser action

 

 

   About the author / 作者简介    

Jipeng Shi is a full time Ph.D. student at Dalian University of Technology. His current research interests include light alloy welding process and the development of the low power pulsed laser-arc hybrid welding equipment. He received his M.S. degree and B.S degree in Material in Lanzhou University of Technology in 2009 and 2013 respectively. In 2013, he was admitted to Dalian University of Technology and joined in Key Laboratory of Liaoning Advanced Welding and Joining Technology. So far, he has published 12 journal papers in the field of material manufacturing and machinery manufacturing.

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