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Effect of TiO2, Fe2O3, and Duplex of TiO2 and Fe2O3 Fluxes On Microstructural, Mechanical Properties And, Weld Morphology of A-TIG AH-36 Marine-Grade Steel Weldments

Effect of TiO2, Fe2O3, and Duplex of TiO2 and Fe2O3 Fluxes On Microstructural, Mechanical Properties And, Weld Morphology of A-TIG AH-36 Marine-Grade Steel Weldments
	© 2021 by IJETT Journal
	Volume-69 Issue-12
	Year of Publication : 2021
	Authors : K.Vijaya Kumar, N. Ramanaiah, N. Bhargava Rama Mohan Rao
	DOI :  10.14445/22315381/IJETT-V69I12P226

How to Cite?

K.Vijaya Kumar, N. Ramanaiah, N. Bhargava Rama Mohan Rao, "Effect of TiO2, Fe2O3, and Duplex of TiO2 and Fe2O3 Fluxes On Microstructural, Mechanical Properties And, Weld Morphology of A-TIG AH-36 Marine-Grade Steel Weldments," International Journal of Engineering Trends and Technology, vol. 69, no. 12, pp. 218-228, 2021. Crossref, https://doi.org/10.14445/22315381/IJETT-V69I12P226

Abstract
The current study investigates the metallurgical, mechanical properties and weld morphology of AH-36 marine grade steel with the thickness of 8mm by A-TIG welding butt joints with the application of different fluxes, i.e., TiO2, Fe2O3, and duplex of TiO2 and Fe2O3 at various process parameters, at a constant welding speed 120 mm/min and current varied from 160A to 220A uniformly to optimize 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, and at different operating conditions, weld bead geometry such as Depth (D), width(W), and aspect ratio(D/W) are compared between traditional TIG welding and A-TIG welding. Tensile results reported that fracture occurs at the base region in both TIG welding and A-TIG weldments. The excessive impact strength and irregular heat input were observed with duplex flux coated weldments. A higher aspect ratio, full penetration narrow width of weld bead achieved with TiO2 and Fe2O3 duplex flux coated weldments because of the stable arc, Marangoni effect, and arc constriction. Microhardness results reported that the fusion zone has a higher microhardness in A-TIG welding than ordinary TIG welding. It concluded that TiO2 and Fe2O3 duplex flux coating produced better butt welds of AH-36 steel out of all fluxes. In addition to that, ABAQUS software is used to simulate and validate the tensile test experimental results.

Keywords
A-TIG Welding, AH-36 steel, weld bead depth, weld bead width, weld zones.

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