Analysis of Mechanical, Microstructural Properties and Weld Morphology of A-TIG Welded AH-36 Marine-Grade Steels with Oxide and Duplex Flux Coating

Authors

  • K. Vijaya Kumar Faculty of Mechanical Engineering, GITAM University, Visakhapatnam 530040, India. Phone: +919652805628
  • N. Ramanaiah Faculty of Mechanical Engineering, Andhra University college of Engineering, Andhra university, Visakhapatnam 530022, India
  • N. Bhargava Rama Mohan Rao Faculty of Metallurgical Engineering, Andhra University college of Engineering, Andhra university, Visakhapatnam 530022, India

DOI:

https://doi.org/10.15282/ijame.18.3.2021.22.0699

Keywords:

A-TIG Welding; AH36 steel; Weld bead depth; Weld bead width; Weld zones

Abstract

The current study investigates the metallurgical, mechanical properties and weld morphology of AH36 marine grade steel (with a thickness of 8 mm) by activated-tungsten inert gas  (A-TIG) butt joints, with the application of different fluxes (MoO3, V2O5, and duplex of MoO3 and V2O5) at various process parameters. The welding speed was kept constant at 120 mm/min, and current varied from 160 A to 220 A uniformly to optimise process parameters to achieve desired mechanical properties, weld morphology, and lowest possible heat input. The study also focused on comparing tensile strength, impact strength, and microhardness, heat input during welding, weld bead depth and width between conventional TIG welding and activated flux TIG welding processes at various operation parameters. Tensile results reported that fracture occurs at the base region in ordinary TIG welding and the activated tungsten inert gas welding process. It was noticed that a higher depth to width ratio attained MoO3 and V2O5 duplex flux coated weldments. There is evidence that the depth of weld joints is enhanced because of stable arc, Marangoni effect, and arc constriction. Microhardness results reported that the fusion zone has a higher microhardness in the activated tungsten inert gas welding than the ordinary TIG welding. It was concluded that out of all fluxes, MoO3 and V2O5 duplex flux coating produce better butt welds of AH36 steel.

Downloads

Published

2021-10-01

How to Cite

Kumar K., V., Ramanaiah, N., & Bhargava Rama Mohan Rao, N. (2021). Analysis of Mechanical, Microstructural Properties and Weld Morphology of A-TIG Welded AH-36 Marine-Grade Steels with Oxide and Duplex Flux Coating. International Journal of Automotive and Mechanical Engineering, 18(3), 9101–9112. https://doi.org/10.15282/ijame.18.3.2021.22.0699

Issue

Section

Articles