Volume 24, Issue 2 (February 2024)                   Modares Mechanical Engineering 2024, 24(2): 77-86 | Back to browse issues page

‎ 10.22034/MME.24.2.77

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Thermal Analysis and Microstructural Changes in Plasma Welding Process Inconel718 Fabricated by Selective Laser Melting
Soheil Nakhodchi * 1, Kiumars Shakarami2 , Hadi Salmasi2
1- Khajeh Nasir Toosi University of Technology , snakhodchi@kntu.ac.ir
2- Khajeh Nasir Toosi University of Technology
Abstract:   (1364 Views)
Inconel 718 is used in a wide range of industries such as oil and gas, nuclear, aviation, and etc. due to its excellent mechanical properties. The use of additive manufacturing (AM) to manufacture parts is increasing rapidly Due to the dimensional limitations in the manufacturing of parts using the additive manufacturing methods, these parts must be connected to other parts in different applications with the help of conventional methods such as welding. In this research, the thermal analysis of plasma welding of an Inconel 718 sheet made by SLM method using ABAQUS software is discussed. Input heat with Gaussian distribution was entered into the model by DFLUX subprogram with FORTRAN program language. In order to validate the thermal model, the temperature was measured during the welding process using a thermocouple. A relatively good match is observed between the numerical and experimental thermal analysis results. The microstructure of the welded samples was examined with an optical microscope and the microstructure of base metal, fusion zone, and heat affected zone were investigated. The dendritic structure in the welding area and the occurrence of recrystallization in the heat-affected area was evident. The tensile test results showed that the sample without welding has a higher yield and ductility.
 
Keywords: Additive Manufacturing (AM), Inconel718, Plasma Welding, Selective Laser Melting (SLM), Thermal Analysis
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Article Type: Original Research | Subject: Welding
Received: 2023/11/16 | Accepted: 2024/04/30 | Published: 2024/01/30
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