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Comparison of Mechanical and Metallurgical Properties of Modified 9Cr–1Mo Steel for Conventional TIG and A-TIG Welds

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Abstract

This work attempts to investigate the effect of flux activation on mechanical and metallurgical properties of modified 9Cr–1Mo steel during activated TIG (A-TIG) welding. Composition-based oxide flux MnO2 was identified to produce a 6-mm-thick square-groove butt weld joint in P91 steel plates considering the satisfactory bead penetration during “bead-on-plate” experiment. During the experiment, it was found that using MnO2, the process of “A-TIG” can increase the penetration of the joint and depth-to-width ratio (D/W) of the weld for welding P91 steel up to 231% and 0.93 respectively. The base metal and the multipass GTA weld joint’s mechanical properties have been compared with the modified 9Cr–1Mo steel A-TIG weld joint. To study other metallurgical aspects of the TIG and A-TIG process, tests such as microhardness, tensile, bend, impact test and chemical analysis were performed. Optical microscopy was used to conduct the characterization of microstructure.

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Acknowledgement

I am grateful to the staffs of Pandit Deendayal Petroleum University, Gandhinagar, who equipped me with a podium to conduct the experimental work which was required for the investigation and Board for Research in Fusion Science and Technology (BRFST), Institute for Plasma Research (IPR), Gandhinagar, for sponsoring the research project via project number NFP-08/MAT/01. The project is funded by The Institution of Engineers (India), 8 Gokhale Road, Kolkata 700020, under R&D Grant-in-Aid scheme, Project ID: DR2016003.

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Authors and Affiliations

  1. Chhotubhai Gopalbhai Patel Institute of Technology, Uka Tarsadia University, Maliba Campus, Gopal Vidyanagar, Bardoli-Mahuva Road, Tarsadi, Mahuva, Surat, Gujarat, 394350, India

    Kamal H. Dhandha

  2. Department of Mechanical Engineering, School of Technology, Pandit Deendayal Petroleum University, Raisan, Gandhinagar, Gujarat, 382007, India

    Vishvesh J. Badheka

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  1. Kamal H. Dhandha
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  2. Vishvesh J. Badheka
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Correspondence to Kamal H. Dhandha.

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Dhandha, K.H., Badheka, V.J. Comparison of Mechanical and Metallurgical Properties of Modified 9Cr–1Mo Steel for Conventional TIG and A-TIG Welds. Trans Indian Inst Met 72, 1809–1821 (2019). https://doi.org/10.1007/s12666-019-01657-5

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