Transactions of the Indian Institute of Metals

, Volume 72, Issue 9, pp 2433–2441 | Cite as

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

  • C. V. S. MurthyEmail author
  • A. Gopala Krishna
  • G. Madhusudhan Reddy
Technical Paper


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.


Maraging steel (250) Interpulse TIG welding Electron beam welding Laser beam welding 13-8 Mo stainless steel 



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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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  1. 1.Defence Research and Development LaboratoryHyderabadIndia
  2. 2.Jawaharlal Nehru Technological UniversityKakinadaIndia
  3. 3.Defence Metallurgical Research LaboratoryHyderabadIndia

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