Research advances in high-energy TIG arc welding

Wu, Hong; Chang, Yunlong; Qiang, Mei; Liu, Dan

doi:10.1007/s00170-019-03918-5

Cited by 22 publications

(8 citation statements)

References 86 publications

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“…11 The energy density of the arc can be increased by constricting the arc. 12,13 Many researchers are looking forward to implement welding procedures that can produce higher efficiencies using lower amount of energies. 11,12 Application of external magnetic field (EMF) during welding is one of the techniques to constrict the arc and to improve the energy density within the arc plasma.…”

Section: Introductionmentioning

confidence: 99%

Metallurgical and mechanical properties evolution in cusp-magnetic field-assisted GTAW of low carbon steel

Durgaprasad

Pal

Das

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this work, magnetic field-assisted autogenous gas tungsten arc welding (GTAW) of low carbon steel has been studied. The external magnetic field was generated by custom made rectangular shaped samarium cobalt permanent magnets which were arranged in a manner to generate a cusp-type magnetic field (CMF). The impact of CMF on the morphology and microstructural evaluation of the weld joints were examined prudently using optical microscope, Field-emission scanning electron microscope and X-Ray Diffraction technique. The experimental results exhibited that the CMF assisted GTAW produce joints with better mechanical and metallurgical properties compared to conventional GTAW. In CMF assisted welds, width of weld beads was reduced by an average of 4% and depth of penetration was increased by 13%. Temperature measurement on the work piece showed a significant amount of temperature decrease for the same amount of heat input under the influence of the CMF. An improvement in grain refinement was observed in the heat-affected zone (HAZ) adjacent to fusion boundary by 12% and HAZ adjacent to base metal by 15% compared to conventional GTAW, which in turn promoted a considerable increase in hardness. The tensile properties in CMF assisted welds were enhanced by 3% and 8%, respectively, for an increase of heat inputs from 0.34 to 0.45 kJ mm−1.

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Section: Introductionmentioning

confidence: 99%

Metallurgical and mechanical properties evolution in cusp-magnetic field-assisted GTAW of low carbon steel

Durgaprasad

Pal

Das

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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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%

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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“…Such limitations paved the way for accelerated development of the conventional TIG welding process. As a consequence, several novel variants of the existing process have emerged [4], which include activated TIG (A-TIG), flux bounded TIG (FB-TIG), keyhole TIG (K-TIG), deep penetration TIG (DP-TIG), twin-electrode TIG (T-TIG), highfrequency pulse TIG (H-TIG), hybrid laser TIG (LA-TIG), etc. Activated tungsten inert gas (A-TIG) welding is a variant of well-known GTAW process where a thin layer of suitable activating flux is deposited on the base components prior to establishing the electric arc.…”

Section: Introductionmentioning

confidence: 99%

Productivity improvement in butt joining of thick stainless steel plates through the usage of activated TIG welding

2021

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Activated tungsten inert gas (A-TIG) welding is one variant of conventional TIG welding where a thin layer of suitable activating flux is deposited on the parent components prior to constituting the arc in order to harness enhanced penetration. Despite several benefits, industries are still reluctant in overwhelmingly using this new variant. This article attempts to highlight the productivity benefits in employing A-TIG welding either together with or superseding TIG welding during butt joining of 10-mm-thick AISI-316L austenitic stainless steel components. Initially, three single-component fluxes (Cr2O3, Fe2O3, and SiO2) are tested in forehand welding technique under varying currents but with straight polarity. Filler rod having similar metallurgical composition is also delivered during homogeneous welding. The extent of capability of each of the three fluxes is analysed by comparing the weld bead geometrical parameters (penetration, puddle width, and reinforcement) with the same obtained in conventional TIG welding under similar set of parameters. While Fe2O3 and SiO2 fluxes are found capable in enhancing penetration and reducing puddle width and heat affected zone, Cr2O3 flux failed to exhibit better performance. The article further demonstrates the time saving that can be obtained by adopting flux-assisted TIG for joining 10-mm-thick plates. When joining from both the faces is allowed, about 70% less time is desired if a combination of A-TIG and TIG is employed rather than using only TIG welding. If joining from only one face is allowed, then also usage of flux can reduce welding time by 33%.

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Research advances in high-energy TIG arc welding

Cited by 22 publications

References 86 publications

Metallurgical and mechanical properties evolution in cusp-magnetic field-assisted GTAW of low carbon steel

Metallurgical and mechanical properties evolution in cusp-magnetic field-assisted GTAW of low carbon steel

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

Productivity improvement in butt joining of thick stainless steel plates through the usage of activated TIG welding

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