Thermo-electromagnetic effect on weld microstructure in magnetically assisted laser welding of austenite steel

Chen, Xin; Luo, Manlelan; Hu, Renzhi; Li, Ruidi; Liu, Liang; Pang, Shengyong

doi:10.1016/j.jmapro.2019.03.033

Cited by 32 publications

(10 citation statements)

References 15 publications

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“…Furthermore, the increase of residual austenite indicates that the application of magnetic field prolongs the solidification time and reduces the cooling rate of weld pool. Due to the decreased cooling rate, Chen et al [ 91 ] found that the static LMF can widen the transition region of weld microstructure from 65 to 140 μm in bead‐on‐plate LW of 304 stainless steel. Small transition region means large microstructure gradients and stress concentration.…”

Section: Magnetic Field‐assisted Laser Weldingmentioning

confidence: 99%

Effects of Magnetic Fields in Arc Welding, Laser Welding, and Resistance Spot Welding: A Review

Shi

Cui

et al. 2022

Adv Eng Mater

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The application of magnetic field in welding process has been proved to be effective in improving the mechanical properties of welded joints and is regarded as a practicable auxiliary welding method. Although the theoretical research on magnetic field‐assisted welding is quite abundant, there is still a long way to go before a stable industrial application is achieved. Therefore, to clarify magnetic field and compare its roles in various welding techniques, this work carefully examines the use of magnetic field in recent welding techniques such as laser welding, laser‐melt inert gas hybrid welding, gas metal arc welding, tungsten inert gas welding, and resistance spot welding. Based on previous experiments and simulation research results, the effects of the Lorentz force on the arc, molten pool, and dendrite solidification during welding as well as the microstructure and mechanical properties of welded joints are discussed. The purpose of this work is to give a superficial introduction to the magnetic field‐assisted welding method in recent years, hoping to improve the welding practitioners’ understanding of the magnetic‐assisted welding method and provide a reference for researchers who use different welding methods.

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Section: Magnetic Field‐assisted Laser Weldingmentioning

confidence: 99%

Effects of Magnetic Fields in Arc Welding, Laser Welding, and Resistance Spot Welding: A Review

Shi

Cui

et al. 2022

Adv Eng Mater

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“…The existing research [20][21][22] has shown that, under certain conditions, the presence of thermoelectric magnetic force in the weld pool can promote local flow and increase crystallization speed. For example, the selection of appropriate magnetic field parameters can optimize the weld structure, reduce welding defects, and improve the mechanical properties of the joint during laser wire-filled welding of stainless steel and other metal materials [23,24]. However, limited research has been conducted on the structure and properties of laser wire-filled welded joints of advanced high-strength steel for automobiles with the assistance of a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of magnetic field assisted laser wire-filled welded 22MnB5 steel joints

Zhu,

Liu,

Yin

et al. 2023

Mater. Res. Express

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The magnetic field-assisted laser wire-filled welding test of 1.5 mm automotive 22MnB5 steel is performed to investigate the influence of magnetic field on the microstructure and properties of the welded joints. When no magnetic field is applied, and the laser heat input is 190 J mm−1, the welded joint width and the grain size of the coarse grain region are large. Also, there is an obvious hump defect at the bottom of the weld. Under the same heat input conditions, when a 5 mT and 15 mT steady magnetic field is applied, the thermoelectric magnetic force generated by the magnetic field promoted the flow of molten pool and concentrated laser energy. It is found that the hump defect is eliminated, the width of the welded joint is reduced, the grain size of the coarse grain region is significantly reduced, and the overall hardness of the welded joint is improved. However, different magnetic induction intensities have different effects on the solid phase transformation of the weld. When no magnetic field is added, the weld center is mainly composed of granular bainite and polygonal ferrite due to the slow cooling rate of the molten pool. When the applied magnetic field is 5 mT, the center of the weld is mainly composed of brittle and hard upper bainite because the thermoelectric magnetic force stirs the molten pool and accelerates the cooling rate of the molten pool but the overall mechanical properties of the welded joint were relatively poor. At 15 mT, lath martensite and lower bainite predominate in the weld center due to the increased cooling rate of the molten pool, thereby increasing the overall mechanical properties of the welded joint. Therefore, choosing the appropriate magnetic induction intensity is critical for improving the microstructure and properties of welded joints.

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“…Yan et al [7] conducted laser beam welding of steel/aluminum with magnetism support and thought the magnetism support caused more iron-rich intermetallic compounds to be formed on the joint interface. Chen et al [8] applied magnetic field-assisted fiber laser welding technique for joining 304 steel and declared that the magnetic field made the breadth of the transition area wider and improve the microstructure gradient of the weld seam. Qi et al [9] performed magnetic field supported laser welding on 304 steel plate based on observing the formation of periodic roots with CCD, and they deduced that electromagnetic force can prevent periodic root humps.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of magnesium/aluminum laser welding with magnetic field

Zhou

Liu

2021

Int J Adv Manuf Technol

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A three-dimensional numerical model for thermal-fluid-metallurgical coupling was established to inspect the effect from a stable longitudinal magnetic field on molten pool of magnesium/aluminum laser welding. Magnetic field-assisted laser welding platform was built to test the morphology and spectrum of the metal vapor/plasma. The scanning electron microscope (SEM) and energy dispersive spectrometry (EDS) were used to determine the morphology and element distribution of molten pool cross section. Simulation results showed that temperature gradient of molten pool was reduced, heat distribution became uniform, and keyhole area was enlarged. In addition, the flow velocity of molten pool was increased, the vorticity of molten pool was improved, and the flow region of liquid metal was enlarged. Experimental results showed that penetration of molten pool was deeper, the shape of welding pool tended to be symmetrical and the density of Al element distribution in welding pool was increased by magnetic field. Thus, heat and mass transfer in welding pool was promoted due to the application of magnetic field, the elements exchange and the convection of liquid metal were accelerated, and the distribution of Mg-Al compounds should be dispersed under the agitation of Lorentz force. It's predicted that the distribution of Mg-Al compounds in magnesium/aluminum laser welding would be positively affected by magnetic field, which was beneficial to control the weld quality. Hence, numerical results and experimental verification shared good consistency.

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Thermo-electromagnetic effect on weld microstructure in magnetically assisted laser welding of austenite steel

Cited by 32 publications

References 15 publications

Effects of Magnetic Fields in Arc Welding, Laser Welding, and Resistance Spot Welding: A Review

Effects of Magnetic Fields in Arc Welding, Laser Welding, and Resistance Spot Welding: A Review

Microstructure and properties of magnetic field assisted laser wire-filled welded 22MnB5 steel joints

Numerical and experimental investigation of magnesium/aluminum laser welding with magnetic field

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