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Title: Dissimilar metal welding of P91 steel-AISI 316L SS with Incoloy 800 and Inconel 600 interlayers by using activated TIG welding process and its effect on the microstructure and mechanical properties
Authors: Kulkarni A.
Dwivedi, Dheerendra Kumar
Vasudevan M.
Published in: Journal of Materials Processing Technology
Abstract: This study investigates dissimilar metal weldments between P91 steel and AISI 316 L austenitic stainless steel fabricated by activated TIG welding (A-TIG) with and without the use of interlayers of Incoloy 800 and Inconel 600. Through thickness penetration in 8 mm thick plates was achieved in a single pass A-TIG welding using a pre-coated mixture of metallic oxides. Hot cracking was eliminated in A-TIG weld joints in contrast to conventional TIG weld joints without flux. Fully martensitic structure was observed in the weld metal developed without the use of interlayer. Microstructural modifications were achieved with the use of interlayers. The weldment with Incoloy 800 interlayer exhibited martensitic-austenitic structure whereas fully austenitic structure was observed with Inconel 600 interlayer. Interlayers improved impact toughness and ductility of the weld joints without significant loss of tensile strength. The effect of interlayers on carbon migration after aging treatment (620 °C/500 h) was evaluated with the help of thermodynamic simulations and it was observed that the use of interlayers reduced the severity of carbon migration. © 2019 Elsevier B.V.
Citation: Journal of Materials Processing Technology (2019), 274(): -
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: A-TIG welding
Carbon migration
Dissimilar metal joints
ISSN: 9240136
Author Scopus IDs: 56611911300
Author Affiliations: Kulkarni, A., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, 247667, India
Dwivedi, D.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, 247667, India
Vasudevan, M., Advanced Welding Processes and Modelling Section, Materials Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India
Funding Details: The authors would like to thank the Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy, Government of India for funding the research project entitled “Dissimilar steel welding by activated flux GTAW†under the scheme sponsored research project sanction No.36(2)/14/70/2014-BRNS/10416. The authors would also like to thank SAIF, IIT Bombay for providing SEM-WDS facility. Appendix A
Corresponding Author: Kulkarni, A.; Department of Mechanical and Industrial Engineering, Indian Institute of TechnologyIndia; email:
Appears in Collections:Journal Publications [ME]

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