Dissimilar laser brazing of h-BN and WC-Co alloy in Ar atmosphere without evacuation process

Abstract

Laser brazing with Ti as an active element in Ag-Cu alloy braze metal has been successfully applied to dissimilar joining of h-BN and WC-Co alloy in Ar (99.999% purity) gas flow atmosphere without any evacuation process. Good wettability of the braze metal with h-BN and WC-Co alloy were confirmed by the observation and structural analysis of the interface by electron probe micro-analysis and scanning acoustic microscopy. The oxidation of titanium was not observed and this showed that the laser brazing with titanium as an active element in braze metal could be performed even in an Ar gas flow atmosphere without an evacuation process using a high-vacuum furnace.

Laser Brazing of a Hexagonal Boron Nitride Block to a Cemented Carbide Plate with Silver-Copper-Titanium Alloy Filler in Argon Atmosphere Including Different Oxygen Contents

“…For the process in a 10 L/min Ar flow rate without pre-evacuation, there were no big voids in the central black areas where melted braze existed at the joint interface 19) .…”

Comparative Study on the Microstructural and Mechanical Properties of WC-Co/AISI 1020 Steel Brazed Joint Obtained by TIG and Oxyacetylene Process

“…The selection of materials for cutting and drilling tools is crucial; it requires a combination between good toughness and high hardness. For that raison, the employment of WC-Co cermet seems a good choice due to its excellent properties including high hardness, good resistance even at high temperature and its low thermal expansion coefficient (TEC) [1,2]. Recently, the assembly of cermet or hard metals to steel structures especially for drilling and cutting tools has generated a lot of interest [3][4][5][6].…”