Arc characteristics and droplet transfer process in CMT welding with a magnetic field

Sun, Qingjie; Li, Junzhao; Liu, Yibo; Jiang, Yunlu; Kang, Kexin; Feng, Jicai

doi:10.1016/j.jmapro.2018.01.017

Cited by 44 publications

(17 citation statements)

References 25 publications

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“…The arc plasma rotated due to the spiral motion of charged particles by the Lorentz force, which resulted in the increase of the arc width. Therefore, the heating area on the surface of the steel plate was expanded [25], which can help to break oxide film and promote wetting of weld metal. Additionally, diverging distribution of current lines existed in the molten pool from top to bottom as well, which was conducive to the spreading behavior of the molten pool driven by the electromagnetic force.…”

Section: Methodsmentioning

confidence: 99%

“…Yan et al [24] discovered that the magnetic field can control the formation of IMCs at the interface of Al/steel and inhibit the crack growth in the laser welding process. Sun et al [25] joined aluminum and titanium by cold metal transfer (CMT) welding process and found that the heating area of weld arc increased and the peak temperature reduced with the adaptation of axial magnetic field. Jin et al [26] found that the magnetic field can promote the wetting of liquid Cu on a steel surface and affect the interfacial microstructure evolution in CMT welding process.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Al/Steel Butt Joint by Hybrid CMT Welding with External Axial Magnetic Field

Kang

Liu

et al. 2020

Materials

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The 6061 aluminum alloy and 304 stainless steel were welded by hybrid cold metal transfer (CMT) welding with external axial magnetic field. The effects of magnetic intensity and frequency on joint microstructure and mechanical properties were studied. It was found that the magnetic field can promote the spreading of aluminum weld metal on the steel surface and thus increase the bonding area of Al/steel butt joint. The welding process stability improved, while the wetting behavior worsened with the introduction of alternating frequencies. The thickness of the intermetallic compound (IMC) layer at Al/steel interface was reduced to 3 μm with the coil current of 2 A. The application of the magnetic field promoted the aggregation of Si atoms at the interface and inhibited the formation of brittle (Al, Si)13Fe4 phase. The fracture paths were transformed from (Al, Si)13Fe4 layer to Al8Fe2Si layer with the application of the magnetic field. The maximum tensile strength reached 130.2 MPa, an increase of 61.6% in comparison to the normal CMT process.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al/Steel Butt Joint by Hybrid CMT Welding with External Axial Magnetic Field

Kang

Liu

et al. 2020

Materials

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“…It is evident from the literature for AA6061-T6 that a straight reduction of 45% in yield strength [5], 40% in tensile strength [4,9], 43-45% of hardness [5,10] was frequently observed against the arc welding processes. Still and all, limited attempts are reported in the literature for controlling the weldment properties which broadly includes: inoculation created with nucleates, magnetic arc oscillation [11,12], pulsed current utilization, gas impingement from the surface, vibration inducement from exciting source [13] and cold metal transfer (CMT) techniques. However, CMT and pulsed or variable current utilization have built-up some reputation as the advanced modification in fusion welding systems.…”

Section: Page 2 Of 13mentioning

confidence: 99%

Modified utilization of semi-sectioned tubes as filler coated with MWCNTs–TiO2 in TIG arc welding to recover fusion lost mechanical properties of the weldment

Muzamil

Samiuddin

2018

J Braz. Soc. Mech. Sci. Eng.

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The loss of mechanical properties in heat treatable aluminum alloys categories during arc fusion welding processes is a critical issue, which limits the direct application in contrast to different post-treatments methods. This work involved a strategy for the novel and distinctive formation of fillers using 3-mm-diameter (AA6061) tubes having MWCNTs and TiO 2 nanoparticles coating on the inner surface. A series of experiments were conducted using TIG welding to evaluate the effect of welding current and composition of inside coating (MWCNTs-TiO 2) contents on welding strength. Three gradually increasing current values (160 A, 180 A and 200 A) were selected and tested against three combinations of nanocomposite coatings that include 1 wt% MWCNTs-TiO 2 , 1.5 wt% MWCNTs-TiO 2 and 2 wt% MWCNTs-TiO 2. Acceptable qualified bonding between nanocomposite and inside surface is utmost important before conducting the experiments, Tape Test (ASTM-D3359-09 e2) was performed for the assessment of bonding conditions and led to qualitatively exceptional bonding conditions after applying vacuum heating cycle. Tensile test results have demonstrated a significant improvement of 34.20-45.65% strength using innovative nanocomposite coated semi-sectioned tube in comparison to tube fillers without coating. Meanwhile, a beneficial gradually forming W-shape microhardness profile in contrast to conventional U and V shape profiles was achieved at 1.5 and 2 wt% of MWCNTs, and the uplift of hardness in the WZ region up to 86.51% subjected to increase high MWCNTs contents in combination with the current. Therefore, it is concluded to be a virtuous strategy for reinforcing mechanism of weldments to encounter some fusion property loss in aluminum alloys.

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“…As the current on the coil increased, the width of the arc base increased and the height decreased. This modification of the electric arc profile affects the thermal input on the base metal and the behavior of the melting pool, with an increase in the heating area, the thermal input decreases and also provides a spreading of the melting pool [12]. In the same configuration of the concentric coil, the effect of the magnetic oscillation provided changes in the geometry of the bead deposited by the CMT process.…”

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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Arc characteristics and droplet transfer process in CMT welding with a magnetic field

Cited by 44 publications

References 25 publications

Microstructure and Mechanical Properties of Al/Steel Butt Joint by Hybrid CMT Welding with External Axial Magnetic Field

Microstructure and Mechanical Properties of Al/Steel Butt Joint by Hybrid CMT Welding with External Axial Magnetic Field

Modified utilization of semi-sectioned tubes as filler coated with MWCNTs–TiO2 in TIG arc welding to recover fusion lost mechanical properties of the weldment

Device Design for Electric Arc Electromagnetic Constriction

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