Flux Bounded Tungsten Inert Gas Welding Process

Chakravarthy, P.; Agilan, M.; Neethu, N.

doi:10.1201/9780367823207

Cited by 3 publications

(1 citation statement)

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“…The presence of surface active elements in the flux affects the surface tension gradient ( γ/ T, where γ is the surface tension and T is the temperature) that determines the direction of flow of molten metal in the weld pool, i.e., Marangoni convection (Vidyarthy and Dwivedi 2016;Marangoni 1865). Without the flux, the surface tension gradient is negative which means that the molten metal flows from centre to the periphery of weld pool, creating an outward flow that leads to shallow and wide weld bead (Modenesi 2015;Chakravarthy et al 2019;Neethu and Chakravarthy 2020). The surface active elements change γ/ T from negative to positive, so that the molten metal flows from periphery to the centre of weld pool, leading to a narrow and deep weld pool.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of Flux and Weld Parameters During Flux Bounded Tungsten Inert Gas Welding (FBTIG) of Nickel Based Superalloy Inconel 600

Neelima

Agilan

Saravanan

et al. 2021

Trans Indian Natl. Acad. Eng.

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Superalloys are used in the strategic sectors of aerospace, defence and nuclear in view of their high specific strength at elevated temperatures, good weldability and excellent oxidation resistance. Inconel 600 is a nickel-chromium alloy with good oxidation resistance at higher temperatures and resistance in carburizing and chloride containing environments. Tungsten inert gas (TIG) welding is the most versatile fabrication process used due to its efficiency and high level of process control. However, the depth of penetration obtained in the weld joint is quite low making multi-pass welding inevitable for thicksection welding. To improve depth of penetration of TIG welded joints, flux bounded tungsten inert gas (FBTIG) welding was developed, that uses thin layer of activating flux on top of the surface of the workpiece, by maintaining gap along the weld line. The present work focuses on the effect of nature of flux and flux gap on the weld bead geometry and mechanical properties of FBTIG welded Inconel 600 alloy. Optimization of weld and flux parameters was carried out through bead-onplate welding and butt weld joints of Inconel 600 was fabricated using the optimized parameters. Radiographically qualified aerospace quality welds were fabricated and depth of penetration has increased three times for FBTIG welds coated with SiO 2 flux using flux gap of 2.5 mm. The room-temperature tensile strength of FBTIG weldments is comparable to that of TIG welds and it was concluded that single-pass FBTIG welding can replace multi-pass TIG welding, to join thicker sections of Inconel 600.

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Section: Introductionmentioning

confidence: 99%