Open AccessAnalysis of Mechanical, Microstructural Properties and Weld Morphology of A-TIG Welded AH-36 Marine-Grade Steels with Oxide and Duplex Flux Coating
Author(s) -
K Vijaya Kumar,
N. Ramanaiah,
N.B.R. Mohan Rao
Publication year - 2021
Publication title -
international journal of automotive and mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.311
H-Index - 25
eISSN - 2229-8649
pISSN - 2180-1606
DOI - 10.15282/ijame.18.3.2021.22.0699
Subject(s) - gas tungsten arc welding , materials science , welding , metallurgy , indentation hardness , heat affected zone , inert gas , ultimate tensile strength , tungsten , coating , composite material , arc welding , microstructure
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.