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Hafeezur Rahman, A.
- Effect of Rotatory Arc Welding Technology on Metallurgical and Mechanical Performance of Armour Grade Steel Joints
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Authors
Affiliations
1 Research Scholar, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
2 Professor, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
3 Professor, Head and Director, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
4 Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
5 Outstanding Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
1 Research Scholar, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
2 Professor, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
3 Professor, Head and Director, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
4 Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
5 Outstanding Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
Source
Indian Welding Journal, Vol 55, No 2 (2022), Pagination: 76-88Abstract
This work is aimed to investigate the arc rotation effect on mechanical properties and metallurgical characteristics of 18 mm thickness armour grade quenched and tempered (Q & T) steel joints. Mechanical properties like tensile, impact toughness and microhardness were evaluated from welded joints. Metallurgical characteristics of welded joints like macrostructure, microstructure, and weld metal chemical composition were analyzed. From the results, it is observed that the rotating arc gas metal welded (RTA-GMW) joint contain minimum heat affected zone width (1.8 mm) and exhibits better tensile properties (784 MPa) due to the decrease in heat density caused by arc rotation of the joining process. The impact toughness properties of weld joint showed 36 % improvement than the unwelded base metal. Microstructural studies also revealed higher volume percentage of fine delta ferrite (δ-Fe) with vermicular type δ-Fe morphological future in the weld joint. The rotation arc caused reduction in heat input, enhanced strength, impact toughness properties and creation of vermicular type δ-Fe morphology in armour grade Q&T steel welded joints.Keywords
Armour Steel, Rotating Arc Welding, Mechanical Properties, Metallurgical Behaviour.
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