Microstructure evolution and mechanical properties in the depth direction of ultra-high power laser-arc hybrid weld joint of 316L stainless steel

Li, Yan; Jiang, Ping; Li, Yuantai; Mi, Gaoyang; Geng, Shaoning

doi:10.1016/j.optlastec.2022.109093

Cited by 17 publications

(2 citation statements)

References 54 publications

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“…In the IPF of the EBSD results, it was observed that the columnar grains grew perpendicular to the fusion line along the optimal growth direction, which corresponded to the (001) direction for austenite with a face-centred cubic structure [14]. When line or circle laser beam oscillation was applied, the stirring effect of the beam was notably enhanced, leading to the fragmentation of columnar grains near the centre of the weld, but this phenomenon was not observed in the case of eight oscillation, resulting in coarser grain sizes.…”

Section: Resultsmentioning

confidence: 99%

Investigation of keyhole behaviour and its impact on the performance of laser beam oscillating welding through imaging and acoustic signal analysis

Zhang,

Chen,

Tan

et al. 2023

Science and Technology of Welding and Joining

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As an emerging laser welding optimisation technique, beam oscillation still lacks detailed investigation into its underlying process mechanisms. This study investigates the microstructure and mechanical properties of 316LN welded joints under four oscillation modes, the results demonstrate that beam oscillation can suppress columnar grain growth and reduce porosity defects, thereby enhancing weld formation and mechanical properties. Building upon these findings, visual and acoustic sensing techniques are employed to analyse dynamic features of keyholes and energy distribution. The correlation between keyhole geometric features and porosity propensity across different oscillation modes is elucidated through visual information. Additionally, the time and frequency domain features of the acoustic signals effectively characterise the stability of the welding process and laser energy absorption efficiency.

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Section: Resultsmentioning

confidence: 99%

Investigation of keyhole behaviour and its impact on the performance of laser beam oscillating welding through imaging and acoustic signal analysis

Zhang,

Chen,

Tan

et al. 2023

Science and Technology of Welding and Joining

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“…In contrast to MAG welding, the hybrid Laser-MAG process combines the merits of both arc and laser, representing an innovative type of welding heat source. It has the advantages of high welding speed, strong bridging capacity, ability to adapt to large clearance, and large weld melting depth [8], [9], which contribute to its excellent application prospects in the field of automobile manufacturing.…”

Section: Introductionmentioning

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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Progress and perspectives of joints defects of laser-arc hybrid welding: a review

Liu,

Wu,

Wang

et al. 2023

Int J Adv Manuf Technol

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Microstructure evolution and mechanical properties in the depth direction of ultra-high power laser-arc hybrid weld joint of 316L stainless steel

Cited by 17 publications

References 54 publications

Investigation of keyhole behaviour and its impact on the performance of laser beam oscillating welding through imaging and acoustic signal analysis

Investigation of keyhole behaviour and its impact on the performance of laser beam oscillating welding through imaging and acoustic signal analysis

An improved simulation of temperature field in Laser–low current

Progress and perspectives of joints defects of laser-arc hybrid welding: a review

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