How to weld PDC cutters to avoid edge break?

pdc cutters welding skills and precautions

With the emergence of advanced manufacturing processes, diamond materials have been widely used in the industrial field. pdc cutters not only have the characteristics of high diamond hardness and wear resistance, but also has good impact resistance and crack resistance, and has become an irreplaceable material. However, due to the great difference in the coefficient of expansion between itself and the metal, it is difficult to achieve a good connection, and it is necessary to choose suitable welding materials and skills.

First,  the choice of common welding materials

1. Silver welding material

Silver welding material has good electrical and thermal conductivity, and is not easy to oxidize at high temperature, and is often used in arc welding of pdc cutterss. Most of the alloys are composed of silver, copper, zinc, nickel, tin, palladium and other metals, and the different alloy composition and proportion will affect the performance of the silver filler metal. When selecting the silver welding material, it should be noted that its hardness and thermal expansion coefficient match the pdc cutters, otherwise it will cause deformation at the joint and affect the quality of the connection.

2. Tungsten electrode flame welding material

Tungsten flame welding material is a kind of high purity metal welding material, tungsten welding point temperature up to 3000 degrees or more, the welding effect is ideal. When pdc cutters and tungsten electrode flame welding, it is necessary to use pure tungsten or tungsten-cobalt alloy as tungsten electrode flame welding material, its thermal expansion coefficient is similar to pdc cutters, will not affect the joint, can achieve better welding effect.

Second, the welding method of pdc cutters

1. Arc welding

Arc welding is a common welding method of pdc cutterss, which is suitable for the connection between pdc cutterss and the connection between pdc cutters and metal. Its operation is simple and high efficiency, but it is necessary to pay attention to the selection of suitable welding materials and control the welding temperature to avoid problems such as cracks and deformation of the weld.

2. Plasma welding

Plasma welding is a high energy thermal welding process, with a welding point temperature of more than 10,000 degrees, which can accurately weld PDC cutters. Plasma welding does not need to be filled with metal materials, so the welding joint has almost no heat affected zone, but its operation is difficult and requires special equipment and technical support.

Third, precautions for PDC cutters welding

1. Select the appropriate welding material and control the welding temperature to avoid problems such as cracks and deformation of the weld.

2. As a thin film material, the edge of the PDC cutters is susceptible to heat deformation, so it is necessary to pay attention to its edge deformation when welding, and measures should be taken to prevent deformation.

3. In order to avoid the negative impact of welding operations on the PDC cutters, it is recommended to pre-treat the PDC cutters before welding, including steps such as oil removal, decontamination and oxidation.

In short, PDC cutters is a kind of high hardness, high wear resistance of high-quality materials, its welding needs to choose the appropriate welding technology and materials, in strict accordance with the operating requirements, to ensure the quality of welding.