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Dissimilar Welding of Maraging Steel (250) and 13-8 Mo Stainless Steel by GTCAW, LBW and EBW Processes

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Abstract

The frequently used aerospace materials, i.e., ultra-high-strength maraging steel (250) and corrosion-resistant 13-8 Mo stainless steel in the solution-annealed and cold-worked condition, have been joined by three fusion welding processes, namely interpulse TIG welding, and high energy density fusion processes like electron beam welding (EBW) and laser beam welding (LBW). The interpulse TIG welding process was carried out by using W2 grade maraging steel filler wire. The dissimilar joints were welded by EBW and LBW processes without any filler wire. All the dissimilar welded joints were characterized by microstructural observations and validated by mechanical properties in the as-welded as well as precipitation-hardened conditions after welding. The weld microstructures and microhardness profiles were correlated to the tensile strength of weld. Electron beam welded joint with precipitation hardening after welding, i.e., soaking at 510 °C and subsequent air cooling, demonstrated the superior mechanical properties among all the welds.

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Acknowledgements

The authors are grateful for financial support extended by Defence Research and Development Organization (DRDO). The authors would like to sincerely thank Director, Defence Research and Development Laboratory (DRDL), Hyderabad, for his continued encouragement and permission to publish this work. The authors are also grateful to Materials Development Division of DRDL for their valuable support in characterization of samples.

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Authors and Affiliations

  1. Defence Research and Development Laboratory, Hyderabad, 500 058, India

    C. V. S. Murthy

  2. Jawaharlal Nehru Technological University, Kakinada, India

    A. Gopala Krishna

  3. Defence Metallurgical Research Laboratory, Hyderabad, 500 058, India

    G. Madhusudhan Reddy

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  1. C. V. S. Murthy
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  2. A. Gopala Krishna
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  3. G. Madhusudhan Reddy
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Murthy, C.V.S., Krishna, A.G. & Reddy, G.M. Dissimilar Welding of Maraging Steel (250) and 13-8 Mo Stainless Steel by GTCAW, LBW and EBW Processes. Trans Indian Inst Met 72, 2433–2441 (2019). https://doi.org/10.1007/s12666-019-01695-z

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  • DOI: https://doi.org/10.1007/s12666-019-01695-z

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