Journal article
Analysis of plasma characteristics and conductive mechanism of laser assisted pulsed arc welding
Optics and lasers in engineering, Vol.92, pp.39-47
05/2017
DOI: 10.1016/j.optlaseng.2016.12.016
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.
•A significant parabolic channel was formed between the keyhole and the wire tip.•The channel became the main method of energy transformation between the arc and the molten pool.•The electron density shows a gradient distribution in hybrid welding.
Details
- Title: Subtitle
- Analysis of plasma characteristics and conductive mechanism of laser assisted pulsed arc welding
- Creators
- Shuangyu Liu - Changchun University of Science and TechnologyShixian Chen - Changchun University of Science and TechnologyQinghua Wang - University of IowaYanqing Li - Changchun University of Science and TechnologyHong Zhang - Changchun University of Science and TechnologyHongtao Ding - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Optics and lasers in engineering, Vol.92, pp.39-47
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.optlaseng.2016.12.016
- ISSN
- 0143-8166
- eISSN
- 1873-0302
- Grant note
- name: National Nature Science Foundation Program of China, award: 51305044
- Language
- English
- Date published
- 05/2017
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196627802771
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