Abstract
In order to improve the melting efficiency of double-TIG arc, based on the synchronous induction of pulsed laser to double-arc, the coupling-enhanced discharge phenomenon between double-arcs is studied in this paper. The melting efficiency of pulsed laser-induced double-arc is quantitatively analyzed. The physical characteristics of coupling double-arc are studied based on high-speed camera and spectral diagnosis technology. The physical model is established to discuss the particle migration during the coupling discharge, characterizing the movement state of electrons. The results show that Dla (horizontal distance between the tungsten electrode tip and laser beam axis) has a significant effect on the melting efficiency of the heat source. With the increase of Dla, there are three interaction relationships between the double-arc plasma and keyhole plasma: mutual interference, coupling-enhanced discharge, and no interaction. A suitable Dla can realize the synchronous induction of laser to double-arc plasma, forming a coupling double-arc; the heat source has a higher melting efficiency. The migration of particles in double-arc can be divided into four stages: double-arc free discharge stage, laser-induced initial stage, laser-induced contraction stage, and laser-induced stable stage. Under the induction of laser, the double-arc forms a common compressed conductive channel. The energy density of coupling double-arc reaches 9.3 times that of traditional double-arc, and the total electron kinetic energy increases by 38% compared with traditional double-arc.
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Funding
This work was supported by the National Key R&D Program of China (2018YFB1107902) organization name: Ministry of Science and Technology of the People’s Republic of China.
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Liming Liu: conceptualization, funding acquisition.
Xinkun Xu: roles/writing—original draft, methodology, formal analysis.
Guomin Xu: data curation, supervision.
Zhaodong Zhang: writing—review and editing, validation.
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Liu, L., Xu, X., Xu, G. et al. Effect of laser on double-arc physical characteristics in pulsed laser-induced double-TIG welding. Int J Adv Manuf Technol 119, 1515–1529 (2022). https://doi.org/10.1007/s00170-021-08277-8
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DOI: https://doi.org/10.1007/s00170-021-08277-8