Experimental Investigation of the A-TIG Welding Process of Incoloy 800H

Srirangan, Arun Kumar; Sathiya, P.

doi:10.1080/10426914.2015.1019092

Cited by 46 publications

(9 citation statements)

References 13 publications

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“…Venkatesan et al [9] identified that with A-TIG welding productivity could be improved by avoiding special edge preparation and reducing the number of passes in welding thick plates. Studies conducted by ArunKumar and Sathiya showed that flux addition changed the mode of solidification and the microstructure which influenced the mechanical properties of the weld metal [10]. Additional advantages offered by A-TIG welding, such as improvement in mechanical strength and reduction in angular distortion were identified by Chern et al [11].…”

Section: Introductionmentioning

confidence: 98%

Activated TIG welding of AISI 304L using mono- and tri-component fluxes

Venkatesan

Muthupandi

Justine

2016

Int J Adv Manuf Technol

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A-TIG welding employs a thin flux layer coated on the surface area to be welded. The flux can be like oxides, chlorides, and/or fluorides. A-TIG welding improves the productivity by enhancing the depth of penetration (DoP) significantly by arc constriction and/or by reversal of Marangoni force. Autogenous Activated-TIG welding employing two monocomponent fluxes viz., SiO 2 and TiO 2 , and tricomponent fluxes comprising SiO 2 , TiO 2 , and Cr 2 O 3 was performed to study their effect on the bead profile of the welds of AISI 304 L. The results were analyzed using Minitab 16 software, and a regression equation giving the effect of composition of the tricomponent fluxes on the DoP was developed. Through optimization, a flux composition to yield the maximum DoP was identified. Results of this study showed that the arc constriction was the dominant mechanism causing the improvement in the penetration. With the optimized flux 82 % raise in DoP was achieved.

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Section: Introductionmentioning

confidence: 98%

Activated TIG welding of AISI 304L using mono- and tri-component fluxes

Venkatesan

Muthupandi

Justine

2016

Int J Adv Manuf Technol

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“…Xiong Xie et al, [17] reported that nanopowders in TIG welding enhance a deeper penetration and a narrower bead width due to its effective dissociation and the heat input procured from the ATIG welding process.…”

Section: Skariya P D Satheesh M Edwin Raja Dhas and Suneesh Ementioning

confidence: 99%

Experimental Investigation of Pftig Welding Process on 15CDV6 Steel using Nanopowders

D¹,

Tjprc²

2018

IJMPERD

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This study investigates the effect of various nanopowders on PFTIG (Powdered flux Tungsten inert gas) welding of HSLA steel. The High strength low alloy (HSLA) steel identified for this work is 15CDV6 steel. Three different nano-oxide powders such as Cr 2 0 3 , ZnO, and NiO were used in this research. The bead geometry analyzed by using various nanopowders and found that NiO flux has a remarkable effect on penetration and aspect ratio, whereas Cr 2 0 3 flux was unfavorable in this study. The results indicate that 15CDV6 steel welds pasted with NiO nano flux reduce the risk of solidification cracking susceptibility (SCS). The presence of reversal of Marangoni convection found in the dissolved oxygen concentration results using NiO and ZnO nano fluxes and exceeds the required range of 70 ppm. The arc voltage values using NiO flux pointed to higher heat input, and peak temperatures result in welding arc contraction. The Cr 2 0 3 nano flux provides a poor bead geometry compared to conventional TIG welding and other powders.

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“…In addition, carbides, nitrides, and phases like TiC, TiN, M 23 C 6 , γ’(Ni 3 (Al, Ti)), and γ’’(Ni 3 Nb), are prime strengthening phases [ 14 , 15 ]. Elements like Co, Cr, Fe, Mo, W, and Ta in Incoloy 800HT provide solid solution strengthening [ 16 ]. Incoloy 800HT is compositionally different from its parent material, as carbon (C) and Al+Ti percentages are slightly more precisely controlled.…”

Section: Introductionmentioning

confidence: 99%

Study on Microstructure and Mechanical Properties of Laser Welded Dissimilar Joint of P91 Steel and INCOLOY 800HT Nickel Alloy

et al. 2021

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This investigation attempts to explore the weld characteristics of a laser welded dissimilar joint of ferritic/martensitic 9Cr-1Mo-V-Nb (P91) steel and Incoloy 800HT austenitic nickel alloy. This dissimilar joint is essential in power generating nuclear and thermal plants operating at 600–650 °C. In such critical operating conditions, it is essential for a dissimilar joint to preserve its characteristics and be free from any kind of defect. The difference between the physical properties of P91 and Incoloy 800HT makes their weldability challenging. Thus, the need for detailed characterization of this dissimilar weld arises. The present work intends to explore the usage of an unconventional welding process (i.e., laser beam welding) and its effect on the joint’s characteristics. The single-pass laser welding technique was employed to obtain maximum penetration through the keyhole mode. The welded joint morphology and mechanical properties were studied in as-welded (AW) and post-weld heat treatment (PWHT) conditions. The macro-optical examination shows the complete penetrations with no inclusion and porosities in the weld. The microstructural study was done in order to observe the precipitation and segregation of elements in dendritic and interface regions. Solidification cracks were observed in the weld fusion zone, confirming the susceptibility of Incoloy 800HT to such cracks due to a mismatch between the melting point and thermal conductivity of the base metals. Failure from base metal was observed in tensile test results of standard AW specimen with a yield stress of 265 MPa, and after PWHT, the value increased to 297 MPa. The peak hardness of 391 HV was observed in the P91 coarse grain heat-affected zone (CGHAZ), and PWHT confirmed the reduction in hardness. The impact toughness results that were obtained were inadequate, as the maximum value of impact toughness was obtained for AW P91 heat-affected zone (HAZ) 108 J and the minimum for PWHT Incoloy 800HT HAZ 45 J. Thus, difficulty in obtaining a dissimilar joint with Incoloy 800HT using the laser beam welding technique was observed due to its susceptibility to solidification cracking.

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Experimental Investigation of the A-TIG Welding Process of Incoloy 800H

Cited by 46 publications

References 13 publications

Activated TIG welding of AISI 304L using mono- and tri-component fluxes

Activated TIG welding of AISI 304L using mono- and tri-component fluxes

Experimental Investigation of Pftig Welding Process on 15CDV6 Steel using Nanopowders

Study on Microstructure and Mechanical Properties of Laser Welded Dissimilar Joint of P91 Steel and INCOLOY 800HT Nickel Alloy

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