Evaluation of Mechanical Properties of the Composite Joints With Metal Powder and Electric Current Flow

Abstract

Abstract The solid-state welding method was applied under atmospheric conditions by using metal powder medium which was interposed in the space between the two solid bars of specimen (i.e., base metal), and was compressed longitudinally and simultaneously current was conducted to generate Joule thermal heat. Some fundamental data on the mechanical and metallurgical properties of the joint were obtained by using resistance welding. In the experiments, the specimen materials used as base metals in this study were pure aluminum, stainless steel and titanium bars of solid, and the powder media were aluminum, nickel and silicon powder. The mixed silicon powder medium increases electric resistance between base metals, moreover, to obtain mechanical properties. Four experiments were conducted with different specimen; The first experiment used two solid aluminum specimen bars with aluminum powder medium. The second, two solid aluminum specimen bars with mixed aluminum and nickel powder media. The third, two solid aluminum specimen bars with mixed nickel and silicon powder media. And the fourth, solid specimen were different materials and had relatively different melting points. Such as solid aluminum and stainless steel (SUS430) with mixed nickel and silicon powder media, and solid aluminum and titanium with mixed aluminum and nickel powder media. Data were obtained with the intent of optimizing the method using powder medium between a pair of solid sample specimen and observation, analysis and assessment were made with microscope. Scanning Electron Microscope (SEM), Energy Dispersive X-ray spectroscopy (EDX). X-ray Diffraction (XRD), tensile strength, Vickers hardness and bending U-shape flexure tests.