EFFECT OF DIFFERENT MIG WELDING MODES ON HARD-FACING OF INCONEL 718 ON 321 STAINLESS STEEL

Karpagaraj Anbalagan, R. Sarala, Manivannan, Shobin Loukkose Rosemary, Hemant Priyadarshi and Muralimohan Cheepu
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Karpagaraj Anbalagan: Department of Mechanical Engineering, National Institute of Technology Puducherry, Karaikal 609609, Puducherry, India
R. Sarala: ��Department of Mechanical Engineering, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi 630003, Tamil Nadu, India
Manivannan: ��Centre for Material Science, Karpagam Academy of Higher Education, Coimbatore 641021, Tamil Nadu, India
Shobin Loukkose Rosemary: �Department of Physics, SRM Institute of Science & Technology (SRMIST), Tiruchirappalli Campus, Tiruchirappalli 621105, Tamil Nadu, India
Hemant Priyadarshi: �Department of Mechanical Engineering, National Institute of Technology Patna, Patna 800005, Bihar, India
Muralimohan Cheepu: ��Super-TIG Welding Co., Ltd., Busan, 46722, Republic of Korea

Surface Review and Letters (SRL), 2022, vol. 29, issue 08, 1-11

Abstract: In this study, the metal inert gas (MIG) welding process is taken to deposit the Inconel 718 material on 321 stainless steel. Various modes like the DC, DC-pulsed, and DC-wave-pulsed modes in MIG welding are used for depositing Inconel 718. The primary parameters such as the welding current (90–120 A) and speed (150–350 mm/min) are varied within the range for making the layer deposition over 321 stainless steel. After performing the layer deposition, the dilution, contact angle, and peak temperature are analyzed to find the optimal MIG welding mode. From the macrograph, very low dilution (7.44%) is identified for the DC mode. The most inferior contact angle (θ) of 49° was measured for the DC-wave-pulsed mode. The simulation work predicted a peak temperature of 2800°C for the DC mode. Considerable microstructure changes have occurred at the weld deposition (dendritic structure) and HAZ (grain coarsening) for all the three modes. At the top, interface, and HAZ locations, the microhardness obtained from the DC-pulsed mode is in between those of the DC and DC-wave-pulsed modes. Overall, the DC-pulsed mode is qualified for making the metal deposition and further work. For 50% overlap, defect-free 2-mm-thick layer depositions are made on the 321 stainless steel surfaces.

Keywords: Hard-facing; MIG welding; Inconel 718; Overlay (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X22501074

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