Sandvik Intellectual Property Ab

Sandvik Ab

Gary William Sweetman

Jonathan Fair

Ihsan Al-Dawery

Michael John Carpenter

A method of joining a plurality of parts to form a unitary body. At least two sintered parts are provided. At least one of the sintered parts has at least one internal channel. Each of the parts is formed of a hard metal composition of material. The at least two sintered parts are assembled into the shape of a unitary body. Each of the at least two sintered parts has a joining surface and when each joining surface is brought into contact the surfaces form a bonding interface therebetween. The assembled parts are subjected to a vacuum or gas atmosphere, without the application of external pressure, and to a temperature sufficient to fuse the at least two sintered parts together at the bonding interface to form the unitary body.

Method of joining sintered parts of different sizes and shapes

A method of joining a plurality of parts to form a unitary body. At least two sintered parts are provided. At least one of the sintered parts has at least one internal cavity. Each of the parts is formed of a hard metal composition of material. The at least two sintered parts are assembled into the shape of a unitary body. Each of the at least two sintered parts has a joining surface and when each joining surface is brought into contact the surfaces form a bonding interface therebetween. The assembled parts are subjected to a vacuum or gas atmosphere, without the application of external pressure, and to a temperature sufficient to fuse the at least two sintered parts together at the bonding interface to form the unitary body.

An improved coldforming tool made of a zone in a tungsten carbide-cobalt cemented carbide is disclosed. The tool, preferably a wire drawing nib, contains WC with a mean grain size of 1.5-2 .mu.m and 5-7 weight % Co and with a carbon content close to saturation level and sufficient to exhibit cobalt magnetic measurements of 92%-98% of that of pure cobalt.

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Coventry, United Kingdom

Gary William Sweetman