Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 53, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6463/ab5758
Keywords
hybrid welding; arc plasma; laser-induced vapor; keyhole
Categories
Funding
- National Key R&D Program of China [2017YFE0100100]
- National Natural Science Foundation of China [51675202]
- State Key Laboratory of Advanced Welding and Joining
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The interaction between laser and arc plasma is a central issue in laser-arc hybrid welding. We report a new interaction phenomenon called laser destabilizing arc dynamics in kilowatt fiber laser-TIG hybrid welding of 316L stainless steel. We found the laser action significantly oscillates the arc tail with a 1-3 kHz high frequency. Direct numerical simulation demonstrates that the destabilization mechanism is due to the high-speed oscillated metal vapor ejecting from the mesoscopic keyhole. More interestingly, the high-speed metal vapor could contrict the arc plasma by physical shielding. This provides a fundamentally different explanation from the generally adopted metal vapor ionization theory for laser constrict arc plasma phenomenon. Also, the results substantiate that the arc plasma cannot easily enter into the keyhole because of the violent metal vapor.
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