Analysis of plasma characteristics and conductive mechanism of laser assisted pulsed arc welding |
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| Institution: | 1. College of Mechanical and Electrical Engineering, Changchun University of Science and Technology, 7089 Weixing Road, Changchun 130022, PR China;2. Department of Mechanical & Industrial Engineering, University of Iowa, Iowa City, IA 52242, USA;1. College of Mechanical and Electrical Engineering, Changchun University of Science and Technology, 7089 Weixing Rd., Changchun 130022, PR China;2. Department of Mechanical & Industrial Engineering, University of Iowa, Iowa City, IA 52242, USA;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China;1. School of Material Science and Technology, Liaoning University of Technology, Jinzhou 121001, China;2. Department of Computer Science and Technology, Liaoning Petrochemical Vocational and Technology Collage, Jinzhou 121001, China;1. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China |
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| Abstract: | This study aims to investigate the arc plasma shape and the spectral characteristics during the laser assisted pulsed arc welding process. The arc plasma shape was synchronously observed using a high speed camera, and the emission spectrum of plasma was obtained by spectrometer. The well-known Boltzmann plot method and Stark broadening were used to calculate the electron temperature and density respectively. The conductive mechanism of arc ignition in laser assisted arc hybrid welding was investigated, and it was found that the plasma current moved to the arc anode under the action of electric field. Thus, a significant parabolic channel was formed between the keyhole and the wire tip. This channel became the main method of energy transformation between the arc and the molten pool. The calculation results of plasma resistivity show that the laser plasma has low resistivity as the starting point of conductive channel formation. When the laser pulse duration increases, the intensity of the plasma radiation spectrum and the plasma electron density will increase, and the electron temperature will decrease. |
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| Keywords: | Hybrid laser-arc welding Plasmas Spectrum High nitrogen steel |
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