Optimization of magnetic oscillation system and microstructural characteristics in arc welding of Al/Mg alloys

Liu, Y.B.; Li, J.Z.; Sun, Qingjie; Jin, Peng; Li, B.P.; Feng, Jicai

doi:10.1016/j.jmapro.2019.02.008

Cited by 19 publications

(4 citation statements)

References 21 publications

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“…Meanwhile, Al–Cu alloys are prone to hydrogen pores between and at the ends of columnar dendrites during solidification [21], and the precipitates in aluminium alloys, such as Al 2 Cu, Al 7 Cu 2 Fe, and Al 2 CuMg particles are prone to form heterogeneous nucleates of hydrogen micropores [22,23]. Therefore, the introduction of the magnetic field would theoretically affect the pore conditions in the deposits, and it has been verified in the Al–Mg alloy [19,24].…”

Section: Introductionmentioning

confidence: 99%

Variations of the improved characteristics on microstructure and mechanical properties of Al–Cu alloy fabricated by magnetic field assisted wire-arc additive manufacturing after heat-treated

Zhang

Zhao

Wei

et al. 2023

Science and Technology of Welding and Joining

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In this investigation, Al-Cu alloy was used for wire-arc additive manufacturing experiment with and without assisted longitudinal magnetic field (ALMF) introduced, subsequently, heat treatment was conducted, aiming to investigate the variations of the improved characteristics brought by ALMF on microstructure and mechanical properties after heat-treated. The results indicated that the improved pores condition brought by ALMF was greatly weakened after heattreated, while the promotion for the columnar to equiaxed transition and the improvement to precipitation remained. As for mechanical properties, the improvement of the uniform distribution of microhardness by the ALMF deteriorated. Moreover, the optimisation brought by ALMF on reducing the anisotropy of tensile strength was greatly weakened, and the improvement of elongation disappeared.

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Section: Introductionmentioning

confidence: 99%

Variations of the improved characteristics on microstructure and mechanical properties of Al–Cu alloy fabricated by magnetic field assisted wire-arc additive manufacturing after heat-treated

Zhang

Zhao

Wei

et al. 2023

Science and Technology of Welding and Joining

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“…However, research related to EMF in gas metal arc welding (GMAW) or GTAW has been introduced for a long time since 1962 by Brown et al [5]. The technology used EMF with an induction coil or magnetic field from a permanent magnet is used for some reasons, such as associated with modifying the microstructure [6][7][8][9][10], improving corrosion resistance and pitting resistance [8,[11][12][13], enhanced weld penetration and the characteristics [14,15], the stability of the arc plasma [16][17][18], controlling the droplet transfer [8,19], improving the joint strength [9], and fatigue damage [10]. Compared to the traditional or conventional TIG welding, TIG assisted with an external permanent magnet can improve the depth-to-width ratio and reduce the corresponding heat input.…”

Section: Introductionmentioning

confidence: 99%

“…Overalls increases the quality of the weld joint. Liu et al [7] propose the lap shear joint AZ31 and AA6061 using TIG assisted with three types of magnetic pole's configuration using magnetic oscillation system. They found that the oscillation system tends to decrease the welding penetration and increase welding width, and it is suitable for the lap-shear joint because the wetting behaviour of molten improved.…”

Section: Introductionmentioning

confidence: 99%

Study of Cross-Combination and Square-Combination Configuration Magnetic Field on Tungsten Inert Gas Welding

Baskoro¹,

Amat²,

Arisoni³

2021

IJAME

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In this study, cross-combination and square-combination configuration of the permanent external magnet were used in tungsten inert gas welding process. The external magnetic field effect to the arc plasma was observed using two cameras from the front view and side view. The depth of penetration and weld profile was investigated after welding. In this study, two types of magnets were employed; a 3 mm magnet with intensity ranging from 270-280 mT and a 5 mm magnet with 400-415 mT. Each configuration has three sub-configurations: forward, backward, and side, so there were 12 parameters in this study. The result shows that a cross-combination 5 mm magnet can increase weld penetration in any position, forward, backward or side deflection, and improve the depth-to-width ratio, however using 3 mm magnet did not influence the penetration significantly. Cross-combination has more stiffness and stability of the arc than square-combination. Most configurations have the same size weld bead width. Square combinations had fluctuated result, stiffness and stability of the arc was poor. This investigation aims to enlarge our understanding of the magnetic field effect on the arc plasma and the weld profile. In future, the arc blow effect from the external magnetic field can be controlled and regulated to improve TIG welding performance.

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“…The deposited beads showed a reduction in penetration and reinforcement, with an increase in width. The effect of this concentric oscillation to the electric arc increased the contact area of the arc with the part, thereby reducing the thermal input per unit area, causing the weld pool to move in the direction of spreading the metal deposited on the substrate [13].…”

Section: Introductionmentioning

confidence: 99%

Device Design for Electric Arc Electromagnetic Constriction

Antonello

Bracarense

2020

Soldag. insp.

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The difference of potential between two electrodes results in electric current breaking the dielectric barrier of the gas in this space causing a plasma discharge called electric arc. As a result, there is luminosity and an increase in temperature. Electric arc is used for welding and usually one of the electrodes is cylindrical with small diameter and the other with large area. Because of this configuration, the side section of the electric arc has a bell shape and forms a circular impression in contact with the work piece (the weld pool). With the use of electromagnetic forces, it is possible to change this circular impression, completely changing the behavior and consequently the geometry of the weld pool. This article presents the development and construction of a device for the electromagnetic constriction of the electric arc, capable of changing the cross section of the impression from circular to elliptical. The steps performed in the article were the simulation of the electromagnetic fields generated to change the electric arc shape, the development of the arc constriction device and the application of this electromagnetic constriction in beads on plate. The results show that the electromagnetic forces change the transverse profile of the arc from circular to elliptical, enabling the increase in specific power and a more precise orientation of the electric arc. Also, changing the orientation of the ellipse results in different penetration and width of the bead.

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Optimization of magnetic oscillation system and microstructural characteristics in arc welding of Al/Mg alloys

Cited by 19 publications

References 21 publications

Variations of the improved characteristics on microstructure and mechanical properties of Al–Cu alloy fabricated by magnetic field assisted wire-arc additive manufacturing after heat-treated

Variations of the improved characteristics on microstructure and mechanical properties of Al–Cu alloy fabricated by magnetic field assisted wire-arc additive manufacturing after heat-treated

Study of Cross-Combination and Square-Combination Configuration Magnetic Field on Tungsten Inert Gas Welding

Device Design for Electric Arc Electromagnetic Constriction

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