Influence of Magnets on Arc Shape and Bead Geometry in Gas Tungsten Arc Welding

Shakya, Paramjeet; Singh, Kulwant; Arya, Harish Kumar

doi:10.1080/10426914.2022.2075890

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…The presence of a magnetic field resulted in significant enhancements in penetration shape factors for both NSN and SNS configurations, with improvements of 58% and 46% recorded, respectively. This is advantageous for weld overlays, as wider bead width and shallower penetration are more desirable, as reported by [4,11,15]. 4.…”

Section: Discussionmentioning

confidence: 94%

“…Additionally, the reversal of the Margoni and Lorenz forces contributed to a broader bead and reduced penetration. [4,15]. The NSN configuration yielded a maximum bead width of 9.73 mm and a corresponding penetration depth of 1.46 mm at I m = 2.5 A, while the SNS configuration achieved a maximum bead width of 9.47 mm and a corresponding penetration depth of 1.50 mm at I m = 5 A.…”

Section: Effects Of External Transverse Magnetic Fields On Bead Width...mentioning

confidence: 92%

“…The GTAW process is often considered a highprecision, narrow fusion zone, lack of spatter and slag, stable arc, and low electrode wear welding method [2]. It is commonly used in critical applications such as aerospace, shipbuilding, automotive, food processing equipment, construction and nuclear power plants, petrochemicals, and the offshore sector [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…In GTA welding, the current flows in the same direction as the length of the electrode, creating a magnetic field that surrounds the electrode and negatively affects the weld quality [4,7]. To address this issue, Brown et al introduced a magnet to the welding process in 1962 to study the impact of the magnetic field on weld metals and achieved positive outcomes [7].…”

Section: Introductionmentioning

confidence: 99%

“…They found that when the magnetic field (MF) interacts with the molten metal, it leads to a uniform temperature distribution, promotes grain refinement, minimises the size of the heat-affected zone, lowers microhardness, reduces dilution and micro-segregation, and eliminates the occurrence of magnetic blow, thereby stabilising the arc. Shakya et al [4] implemented electromagnets on both sides in the GTAW process to create a combination of two co-axial magnetic fields. They observed that the original conical shape of the electric arc was deformed, transforming into a compressed elliptical shape, which ultimately increased the bead width.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of weld bead and microhardness of SS316L weld overlays on S355J2+N steel using GTAW under E-type magnet

Raj,

Gill

2023

Eng. Res. Express

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In this study, a three-pole (E-type) electromagnet with magnetic configurations north-south-north (NSN) and south-north-south (SNS) was installed in the GTAW process to generate a combination of two symmetrically transverse external magnetic fields around the weld arc and the molten pool. The effects of magnetic fields obtained by these two types of magnetic configurations (NSN and SNS) on the weld bead characteristics and microhardness in GTAW were analysed. In these experiments, high-strength low alloy (HSLA) S355J2+N grade with a thickness of 10 mm was selected as the substrate material and S316L as the filler wire. Using magnetic fields during the welding process successfully enhanced the weld bead appearance and shape and improved the mechanical characteristics of weld overlays. It was also observed that for different values of excitation current, magnetic fields generated with both configurations ( i.e., NSN and SNS) provide greater bead width, a higher penetration shape factor, and higher microhardness values in comparison to specimens welded with conventional GTAW. The NSN and SNS configurations of the E-type magnet improve the penetration shape factor by 58% and 46%, respectively. These configurations were more suitable for weld overlays (cladding) and hardfacing. However, the observations indicated an enhancement in microhardness for all excitation current values by employing the NSN and SNS magnetic configurations.

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Section: Discussionmentioning

confidence: 94%

Section: Effects Of External Transverse Magnetic Fields On Bead Width...mentioning

confidence: 92%