Welding Process Of Polycrystalline Diamond Tool

In addition to mechanical clamping and bonding methods, the combination of the PCD composite sheet and the cutter body is mostly by brazing to press the PCD composite sheet on the cemented carbide substrate. The welding methods mainly include laser welding, vacuum diffusion welding, vacuum brazing, high-frequency induction brazing and so on. High-frequency induction heating brazing with low investment and low cost is widely used in PCD blade welding. In the blade welding process, the selection of welding temperature, flux and welding alloy will directly affect the performance of the tool after welding. In the welding process, the control of the welding temperature is very important. If the welding temperature is too low, the welding strength will be insufficient; if the welding temperature is too high, the PCD is easy to graphitize, and may cause "overburning", affecting the PCD composite sheet and the cemented carbide The combination of the matrix. In the actual processing process, the welding temperature can be controlled according to the holding time and the degree of PCD turning red (generally it should be lower than 700°C). Foreign high-frequency welding mostly uses automatic welding technology, which has high welding efficiency and good quality, and can realize continuous production; domestically, manual welding is mostly used, which has low production efficiency and unsatisfactory quality.