Microstructure and properties of laser-arc hybrid welding thick bainitic steel joints with different arc position

Guo, Tao; Zhao, Xu; Li, Rendong; Liang, Ying Chun; Jiang, Yishuai; Chen, Hui

doi:10.1088/2053-1591/ab1557

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…When the pulse current I is 160 A, the pulse width τ is 2 ms, the pulse frequency f is 18 Hz, and the welding speed v is changed, Table 1 shows the welding process parameters. Figure 1 shows the microstructure of the molten layer at different welding speeds [9,10]. e smaller the welding speed is, the more fully the solder melts.…”

Section: Effect Of Welding Speed On the Joint Microstructurementioning

confidence: 99%

The Effect of Welding Speed on the Micromorphology and Mechanical Properties of Laser-Sealed Vacuum Flat Glazing Joints

Miao

et al. 2019

Advances in Materials Science and Engineering

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To explore the effect of welding speed on the micromorphology and mechanical properties of the laser-welded vacuum plate glazing joints, this paper introduced the research status of the laser welding vacuum glazing and then carried out the preparation for experimental materials. This paper also analyzed the microstructure, the cause of the pores, and the mechanical properties of the sealing layer. The results show that the smaller the welding speed is, the more fully the solder melts. When the welding speed is 80 mm/min, the sealing layer generates the large thermal stress due to excessive laser input energy, which results in many connected cracks in the sealing layer. The porosity of the sealing layer increases with the increase of the welding speed. The thickness of the interface reaction wetting layer decreases with the increase of the welding speed. The hardness, tensile strength, and shear strength of the sealing layer will increase first and then decrease with the increase of welding speed. These studies can provide the theoretical basis for laser sealing manufacturing of vacuum plate glazing.

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Section: Effect Of Welding Speed On the Joint Microstructurementioning

confidence: 99%

The Effect of Welding Speed on the Micromorphology and Mechanical Properties of Laser-Sealed Vacuum Flat Glazing Joints

Miao

et al. 2019

Advances in Materials Science and Engineering

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“…Hot-dip galvanized steel sheets have extensive applications for the manufacture of automobiles, automobile outer plates, supports, and internal parts because of their good weldability, excellent corrosion resistance, and low cost [1], [2]. MAG welding technology is used for manufacturing most of internal components of automobiles [3], [4]. However, traditional MAG welding is associated with problems such as high thermal input, poor welding efficiency, and serious joint softening [5]- [7].…”

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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“…Zhang et al [7] stated that in laser MAG welding, porosity and undercut defects are more likely to occur in arc-lead mode. Tang et al [8,9]observed the hump phenomenon on the back of weld in laser arc hybrid butt welding and found that arc-lead mode can effectively inhibit the hump formation. Bunaziv et al [10] applied double-sided fiber laser arc hybrid welding to weld 45mm thick high-strength steel, results showed that in order to obtain greater penetration, DLA should be larger in arc-lead mode and smaller in laser-lead mode.…”

mentioning

confidence: 99%

Influence of heat source arrangement on coupling characteristics of low-power pulsed laser-MAG hybrid welding

Tao

Yang

et al. 2023

Int J Adv Manuf Technol

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Low power pulsed laser-MAG hybrid welding was carried out by different heat source arrangement methods (lead mode, distance between laser spot and welding wire tip (DLA)). The coupling effect and welding characteristics of hybrid heat sources under different modes were studied by using high speed image (HSI) and real-time electrical signals. HSI observation and electronic signals showed that the lead mode and DLA significantly affect the coupling state of heat source and welding characteristics (weld morphology, process stability and droplet transfer). The influence of lead mode on weld forming was more significant than that of DLA.In laser-lead mode, when DLA = 1~2mm, the laser and arc had perfect coupling effect, good weld formation, less spatter and greater penetration. In arc-lead mode, the weld formation was poor and undercut defects were common, while the overall penetration was greater than that in laser-lead mode. In terms of welding process stability, arc-lead mode was better than laser-lead mode. The pulsed laser increased the stability of projected transition, produced more fine droplets and reduced the generation of spatter. When DLA = 1~2mm, stable droplet transfer could be realized under both modes.

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Microstructure and properties of laser-arc hybrid welding thick bainitic steel joints with different arc position

Cited by 9 publications

References 21 publications

The Effect of Welding Speed on the Micromorphology and Mechanical Properties of Laser-Sealed Vacuum Flat Glazing Joints

The Effect of Welding Speed on the Micromorphology and Mechanical Properties of Laser-Sealed Vacuum Flat Glazing Joints

An improved simulation of temperature field in Laser–low current

Influence of heat source arrangement on coupling characteristics of low-power pulsed laser-MAG hybrid welding

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