A study of droplet transfer behavior in ultra-narrow gap laser arc hybrid welding

Li, Ruoyang; Yue, Jun; Sun, Run‐Cang; Mi, Gaoyang; Wang, Chunming; Shao, Xinyu

doi:10.1007/s00170-016-8699-9

Cited by 24 publications

(1 citation statement)

References 19 publications

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“…It was found that the energy transformation between the arc and the molten pool is carried out through the electron channel between Metals 2021, 11, 1712 2 of 13 the keyhole and the wire tip. Chen et al [11][12][13] studied the interactions between laser and arc plasma during laser MIG hybrid welding, and the results showed that coupling discharge between the laser keyhole plasma and arc occurs (which strongly enhanced the arc). Gao et al [14][15][16] indicated that the current, laser power, and distance between the laser and arc were the crucial reasons for the process stability and the efficient synergetic effects between the laser and arc of fiber laser MIG hybrid welding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alternating Magnetic Field on Arc Plasma Characteristics and Droplet Transfer during Narrow Gap Laser-MIG Hybrid Welding

Cai

Zhao

et al. 2021

Metals

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In this paper, the morphological characteristics of arc plasma and droplet transfer during the alternating magnetic field-assisted narrow gap groove laser-MIG (metal inert gas) hybrid welding process were investigated. The characteristics of arc plasma and droplet transfer, electron temperature, and density were analyzed using a high-speed camera and spectrum diagnosis. Our results revealed that the arc maintained a relatively stable state and rotated at a high speed to enhance the arc stiffness, and further improved the stability of the arc under the alternating magnetic field. The optimum magnetic field parameters in this experiment were B = 16 mT and f = 20 Hz, the electron temperature was 9893.6 K and the electron density was 0.99 × 1017 cm−3 near the bottom of the groove, which improved the temperature distribution inside the narrow gap groove and eliminated the lack of sidewall fusion defect. Compared to those without a magnetic field, the magnetic field could promote droplet transfer, the droplet diameter decreased by 17.6%, and the transition frequency increased by 23.5% (owing to the centrifugal force during droplet spinning and electromagnetic contraction force). The width of the weld bead was increased by 12.4% and the pores were also significantly reduced due to the stirring of the magnetic field on the molten pool.

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