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.
Highlights
Low-energy consumption and high-efficiency welding technology has become a research hot spot and an important goal in the field of welding
The physical properties of doublearc heat source have not changed: the low energy density and low energy utilization rate, which are the main problem faced by double-arc welding technology, which limits its rapid development and application
The related research of laser-single arc hybrid welding shows that the parameter Dla has a great influence on the interaction between laser and arc plasma [32]
Summary
Low-energy consumption and high-efficiency welding technology has become a research hot spot and an important goal in the field of welding. Double-TIG arc welding is a stable and efficient welding method, which can significantly improve the welding speed and deposition rate. TIG arc is the best welding method for active metal materials (titanium alloy, magnesium alloy, aluminum alloy and high strength steel) due to its low sensitivity to hot cracking [3, 4]. Liu et al achieved high deposition rate of aluminum alloy parts by using double-electrode gas metal arc (DE-GMA) based additive manufacturing (AM) [12]. Increasing the upper limit of welding current is the key to realize high efficiency double-arc welding. The physical properties of doublearc heat source have not changed: the low energy density and low energy utilization rate, which are the main problem faced by double-arc welding technology, which limits its rapid development and application
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