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Title: Effect of shielding gas composition and activating flux on the weld bead morphology of the P91 ferritic/martensitic steel
Authors: Vidyarthy R.S.
Dwivedi, Dheerendra Kumar
Published in: Materials Research Express
Abstract: In the current work, efforts have been made to study the effects of the activating flux and the shielding gas composition on the Tungsten Inert Gas (TIG) welding of SA 387 Gr 91 CL.2 steel (P91 steel). Multicomponent flux comprising of TiO2, SiO2, NiO, CuO, and CeO2 was used as an activating flux. Pure argon (Ar) and argon with nitrogen (Ar + N2) were used as shielding gases. The relation between weld bead morphology and the welding conditions were emphasized with the help of welding arc column profile and arc voltage. Stereomicroscope, Optical microscope and Field emission scanning electron microscope (FE-SEM) equipped with energy dispersive spectroscopy (EDS) were used for macrostructure and microstructure analysis of the P91 weldments. The results suggested that the depth of penetration increases and bead width decreases in presence of the activating flux under Ar shielding. However, depth of penetration and bead width both increased by under Ar + N2 shielding. Activating flux was found insignificant to reduce the bead width during welding under Ar + N2 shielding. The welding arc inconstancy was found responsible for weld bead characteristics obtained during welding under Ar + N2 shielding. © 2019 IOP Publishing Ltd.
Citation: Materials Research Express (2019), 6(8): -
Issue Date: 2019
Publisher: Institute of Physics Publishing
Keywords: A-TIG welding
arc column
bead geometry
nitrogen gas
P91 steel
ISSN: 20531591
Author Scopus IDs: 57188881635
Author Affiliations: Vidyarthy, R.S., Department of Mechanical Engineering, BITS-Pilani, Hyderabad Campus, Telangana, 500078, India
Dwivedi, D.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology RoorkeeUttrakhand 247667, India
Corresponding Author: Vidyarthy, R.S.; Department of Mechanical Engineering, BITS-Pilani, Hyderabad Campus, India; email:
Appears in Collections:Journal Publications [ME]

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