Investigation on Wettability and Metallurgical and Mechanical Properties of Cemented Carbide and Steel Brazed Joint

Abstract

In this study the wettability, microstructure and mechanical properties of joining between cemented carbide and CK35 steel which brazed with two filler metals, L-Ag40Cd and L-Ag34Cd, were investigated. Wettability test shows that with increase of brazing time, the contact angle decreases and the best situation was resulted in the 20 minute brazing. Microscopic investigation of the brazed area with both filler metal shows that there is a copper enriched primary phase and eutectic microstructure in the silver enriched matrix which composed of copper enriched particles. The amount and the dispersion of precipitates are depended upon type of filler metal and brazing temperature. The results show that brazing with L-Ag34Cd filler metal at 800 °C exhibit superior shear strength in the level of 108 MPa.