Modeling of keyhole dynamics and analysis of energy absorption efficiency based on Fresnel law during deep-penetration laser spot welding

Hu, Bao; Hu, Shengsun; Shen, Junqi; Li, Yang

doi:10.1016/j.commatsci.2014.09.031

Cited by 25 publications

(4 citation statements)

References 18 publications

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“…At the top of the workpiece, the hump is gradually formed, while the molten metal gathers. Owing to the large surface temperature gradient in the keyhole, recoil pressure and surface tension induced convection, also known as Marangoni flow, force the molten metal liquid to flow from the bottom to the top [24]. This upward flow makes the molten metal liquid gather at the top surface of the workpiece.…”

Section: Evolution Of the Keyholementioning

confidence: 99%

A study on keyhole evolution and weld ripple formation in dissimilar welding under pulsed laser

Rong

Luo

2017

Science and Technology of Welding and Joining

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A three-transient multiphase model is developed to study the dissimilar metal welding of pure niobium plate to titanium alloy Ti-6Al-4V sheet under pulsed laser. The physical process of dissimilar metal welding involves melting, resolidification, mass transfer, self-consistent keyhole, and weld bead formation. The major physical factors, such as recoil pressure induced by vapourisation, surface tension, heat transfer, fluid flow, Marangoni shear stress, buoyancy force, and their coupling are considered. The results show that the keyhole mainly occurs on the Ti-6Al-4V side due to the differences in physical properties of the materials. The effects of pulse overlapping factor on the weld bead are studied. It is found that the pulsed laser has a significant influence on the weld bead formation. The mixing of materials mostly occurred in the upper part of the molten pool. The simulated weld bead profile and the phase distribution agree well with the experimental results.

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Section: Evolution Of the Keyholementioning

confidence: 99%

A study on keyhole evolution and weld ripple formation in dissimilar welding under pulsed laser

Rong

Luo

2017

Science and Technology of Welding and Joining

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“…Also, laser beam energy absorption and optimization of the laser welding method is the subject of many previous studies [6][7][8], particularly in the case of dissimilar welding [9,10]. Assuncao et al studied the behavior of different metals under laser welding in the transition from conduction to keyhole modes [6].…”

Section: Introductionmentioning

confidence: 99%

MATLAB Image Treatment of Copper‐Steel Laser Welding

Mostafa

Laifi

Ashari

et al. 2020

Advances in Materials Science and Engineering

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Continuous Yb:YAG laser keyhole welding of the pure copper plate to steel 316L sheet is performed for different laser parameters. The laser-generated welding keyhole and weld melted zone are observed by a high-speed camera. The image is treated by MATLAB and simple code is built to calculate the keyhole and melted zone area. This treatment is validated by the actual welding measurements, and the accuracy of the measurements is tested by the confidence interval law. The images obtained of keyhole and melt zone area in dissimilar laser welding are treated and analyzed to study the effect of changing the laser parameters.

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“…Compared to laser conduction welding, laser deep-penetration welding has a greater penetration depth due to the keyhole. The keyhole has a considerable effect on the energy absorption efficiency of the material to the laser beam [1], and multiple reflection, which happens inside the keyhole, is more conducive to the transmission of laser energy toward the bottom of the keyhole. The transfer path of the laser beam is determined by the keyhole wall.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on the dynamic behaviors of the keyhole and molten pool in laser deep-penetration welding

Zhang

Lin

Yin

et al. 2018

J. Phys. D: Appl. Phys.

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Both the morphology and temperature are two important characteristics of the keyhole and the molten pool in laser deep-penetration welding. The modified 'sandwich' method was adopted to overcome the difficulty in obtaining inner information about the keyhole and the molten pool. Based on this method, experimental platforms were built for observing the variations in the surface morphology, the longitudinal keyhole profile and the internal temperature. The experimental results of three dynamic behaviors exbibit as follows. The key factor, which makes the pool width go into a quasi-steady state, lies in the balance between the vortex and the sideways flows around the keyhole. Experimental observation shows that the keyhole goes through three stages in laser welding: the rapid drilling stage, the slow drilling stage and the quasi-steady state. The time for achieving a relative fixed keyhole depth is close to the formation time of the maximum pool width. The internal temperatures inside the keyhole and the molten pool first experience a rapid increase, then a decrease and finally go into a quasisteady state. Compared to that in the unstable stage, the liquid-metal uphill formed in the stable stage of laser welding has less influence on the internal temperature.

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Modeling of keyhole dynamics and analysis of energy absorption efficiency based on Fresnel law during deep-penetration laser spot welding

Cited by 25 publications

References 18 publications

A study on keyhole evolution and weld ripple formation in dissimilar welding under pulsed laser

A study on keyhole evolution and weld ripple formation in dissimilar welding under pulsed laser

MATLAB Image Treatment of Copper‐Steel Laser Welding

Experimental research on the dynamic behaviors of the keyhole and molten pool in laser deep-penetration welding

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