Non-Equilibrium Crystallization with Magnetic Stirring in Pt/Inconel 625 Micro-Joints Welded by Capacitor Charge

Abstract The presented work describes issue of magnetic mixing and segregation of metals during the formation of micro-joints using the capacitor welding method. The key aspect is the very short weld time, which is below 2 ms. The Pt/Inconel 625 micro-joints have been tested in the work. The 100-μm platinum wire was welded to Inconel 625 with the same thickness. During the welding process, the capacitor discharge characteristics were recorded with the oscilloscope. This allowed for a mathematical description of phenomena occurring during the creation of the micro-joint. Observations of the micro-structures from the scanning electron microscope in BSE mode confirmed the strong micro-segregation of the joint components. In addition, the effect of magnetic mixing of the joint components was observed. Weld geometry results obtained from the calculations showed good compliance with the real joint micro-structure observation data.