Effect of distance between the heat sources on the molten pool stability and burn-through during the pulse laser-GTA hybrid welding process

Liu, Liming; Shi, Jipeng; Hou, Zhonglin; Song, Gang

doi:10.1016/j.jmapro.2018.06.038

Cited by 24 publications

(9 citation statements)

References 22 publications

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“…Cai et al [16] explored the influence of laser on the behavior of hybrid weld fluid droplets; they determined that it promoted droplet transition during short-circuit operation. Liu et al [17] found that welding stability can be influenced by the distance between laser and electrodes and achieved effective behavioral control of small holes and melting pools by accurately adjusting this distance. The merits of contemporary numerical simulation methods to study the welding process include high speed, excellent efficiency, and low cost.…”

Section: Several Contemporary Scholars Have Undertaken Substantial Ex...mentioning

confidence: 99%

An improved simulation of temperature field in Laser–low current

Xu,

Sun,

Han

et al. 2024

Preprint

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This study aimed to achieve efficient and precise connection of thin steel sheets for vehicles by analyzing the thermal process of Laser-MAG hybrid high-speed welding lap of thin galvanized steel sheets. A high-speed camera combined with an NI AD data acquisition system were used, and the transition behavior and electrical signals of low-current MAG and Laser-MAG hybrid welding were examined. The thin sheet MAG welding droplet transition method mainly comprised short-circuit transfer. During the short-circuit phase, the voltage decreased and the current increased sharply, forming a short-circuit liquid column. When current increased to a certain level, the liquid bridge burst, the droplets carried heat and kinetic energy to the weld pool, the arc voltage returned to a no-load state, and the arc was re-ignited. In the arcing phase, the current first decreased steeply and then slowly, while the voltage decreased slowly and smoothly. According to the different heat source characteristics of the arc combustion and short-circuit stages during short-circuit transition, a new MAG heat source for low-current short-circuit transition was developed. This study employed a double-ellipse heat source with different powers for the arc combustion stage as well as a uniform body heat source that considered the thermal and kinetic energies of the melt droplets for the short-circuit stage. The thermal input of low current MAG welding was described by double-ellipse and uniform body heat source periodic loading. Moreover, the laser exerted an attraction and compression influence over the arc during the hybrid welding, which promoted the droplet transfer. Therefore, based on the novel MAG heat source, a hybrid Laser-MAG heat source in the short-circuit transition mode was developed. The laser beam heat source was described using a three-dimensional column heat source, the arc attraction and compression by the laser were considered indirectly through distribution parameter tuning for the double-ellipse model, and the laser-promoted transition effects of the droplets were described through the cycle frequency alterations of a double ellipsoid and homogeneous heat source. this heat source model was used to determine the MAG welding and hybrid welding temperature fields. Using hybrid Laser-MAG welding, a weld with a high depth-to-width ratio and complete penetration was obtained. The weld geometry and weld pool length were determined through welding tests, and the test results coincided with the fusion line trend and shape of the weld obtained by simulation, proving the rationality of the developed heat source model.

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Section: Several Contemporary Scholars Have Undertaken Substantial Ex...mentioning

confidence: 99%

An improved simulation of temperature field in Laser–low current

Xu,

Sun,

Han

et al. 2024

Preprint

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“…Therefore, stability of the molten pool could be improved by adjusting the DLA to control the state of the heat source with effect. [59]. Reprinted with permission from [59] 2018 Elsevier.…”

Section: The Laser-to-arc Distancementioning

confidence: 99%

Research Status of Stability in Dynamic Process of Laser-Arc Hybrid Welding Based on Droplet Transfer Behavior: A Review

Liu

Wang

et al. 2023

Coatings

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With the synergistic effect of laser and arc heat sources, laser-arc hybrid welding (LAHW) technology can improve welding speed and penetration depth, and enhance gap-bridging ability. This review describes the fundamental concepts and characteristics of droplet transfer behavior in LAHW. Emphasis was placed on the physical interaction between the laser and arc and the effect of the combined laser/arc heat sources on the welding process. However, the physical understanding of these multivariable and complex interactions is still evolving. Through numerous research findings and summary, it is found that there are several critical factors, including the laser-to-arc distance, heat source leading mode, shielding gas composition, and laser power, affecting the droplet transfer characteristics. This review critically interprets the latest development in the basic understanding of LAHW. It lays great stress on the coupling effect of laser and arc in droplet transfer dynamic process of LAHW, and offers a direction for the future study and progress of LAHW. Significant fields for future research are also confirmed.

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“…For the application of automated welding technology, it is necessary to reduce defects in welding and increase welding manufacturing speed. The distance between the laser beam axis and the tip of the GTAW electrode will seriously affect the stability of the welding process [100]. In the 5mm thick 5083 aluminum alloy pulsed laser-MIG hybrid welding, the rear MIG can improve the stability of the keyhole and decrease the porosity [101].…”

Section: Application Of Pulsed Laser In Hybrid Weldingmentioning

confidence: 99%