Abstract
Inconel 625 is a nickel-based superalloy that finds application in many industrial sectors thanks to its high strength, excellent fabricability, and outstanding corrosion resistance. It is characterized by a good weldability and often used in the as-welded conditions. In the following, a metallurgical and thermal analysis of Inconel 625 Electron-Beam welded joints is described. The thermal analysis was supported by a numerical model that uses a superimposition of a spherical and a conical shape heat source with Gaussian power density distribution in order to reproduce the nail-shape of the fusion zone. The heat source parameters were calibrated by using experimental data coming from metallurgical observations and temperature measurements. Numerical and experimental results were found in good agreement.
Highlights
Nickel-base superalloys for aerospace and industrial applications are of great interest in the materials research field
The thermal analysis was supported by a numerical model that uses a superimposition of a spherical and a conical shape heat source with Gaussian power density distribution in order to reproduce the nail-shape of the fusion zone
It was found that, in laser welding, plasma may be regarded as an independent heat source in the surface, and the laser beam as a volume source resulting in a dagger shape form of the penetration zone
Summary
Nickel-base superalloys for aerospace and industrial applications are of great interest in the materials research field. For this reason, high power density welding technologies [2,3,4], with a particular attention to electron-beam welding (EBW), are the most favorite. The model was applied to TIG welding of Inconel 718 using a semi-analytical solution for the temperature field and a thermal elasto-plastic analysis in two-dimension, assuming a state of plane stress. In such a way, the real shape of the FZ through the thickness and the stress component in z-direction was neglected. Figure 1: 3D representation (a) and top view (b) of the specimen showing the holes position for the thermocouples
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