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Effect of Rotating Arc (Spin Arc) on Mechanical Properties and Microstructural Characteristics of Gas Metal Arc Welded Armour Steel Joints

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Abstract

In this study, comparison has been made between stationary arc gas metal arc welded (STA-GMW) joints and rotating arc gas metal arc welded (RTA-GMW) joints made of 18 mm thick armour steels. Both the joints were tested to evaluate tensile properties, impact toughness and microhardness variations. From the results, it is identified that RTA-GMW joint consists of minimum HAZ width (45%) than STA-GMW joint due to lower heat density attributed during the welding. The RTA-GMW joint exceeds the STA-GMW joint in terms of transverse tensile strength (784 MPa) and impact toughness (82 J). This is attributed to the presence of a greater volume percentage of fine delta ferrite (29.17%) in the RTA-GMW joint weld metal. Furthermore, the delta ferrite morphology in the STA-GMW joint is globular, whereas it is vermicular in the RTA-GMW joint. This may be one of the reasons behind the RTA-GMW joint’s increased performance.

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Acknowledgements

The authors would like to express their gratefulness to the Director, ARMREB, DRDO, New Delhi for funding through project (Project No. ARMREB/MAA/2021/244 dated 12.08.2021).

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Correspondence to N. Sankar.

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Sankar, N., Malarvizhi, S., Balasubramanian, V. et al. Effect of Rotating Arc (Spin Arc) on Mechanical Properties and Microstructural Characteristics of Gas Metal Arc Welded Armour Steel Joints. Trans Indian Inst Met 75, 3047–3059 (2022). https://doi.org/10.1007/s12666-022-02679-2

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