Modares Mechanical Engineering

Modares Mechanical Engineering

Thermal Analysis and Microstructural Changes in Plasma Welding Process Inconel718 Fabricated by Selective Laser Melting

Document Type : Original Research

Authors
Soheil Nakhodchi
Kiumars Shakarami
Hadi Salmasi
Khajeh Nasir Toosi University of Technology
10.22034/MME.24.2.77
Abstract
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

Subjects

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Modares Mechanical Engineering
Volume 24, Issue 2
January 2024
Pages 77-86