How to Avoid Head-Breakage in Tungsten Carbide Burrs: The Science of Flat-Bottom Silver Brazing

The brazing technology and brazing material selection directly determine the quality level of carbide burr.

The welding technology of carbide rotary burrs is one of the key factors that affect their quality. The choice of welding materials and welding processes directly determines the quality level of the carbide rotary burrs.

• Selection of welding materials: Carbide rotary burrs use a core-sandwich silver brazing material, which has silver at both ends and a copper alloy core layer in between. The welding temperature for this material is around 800°C, which is much lower compared to the 1100°C welding temperature required for copper brazing materials. This significantly limits the damage to the carbide properties, reduces welding stress, prevents microcracks in the carbide, and provides better welding strength.

• Selection of welding methods: There are currently two main welding methods in the market: flat-bottom silver brazing and tail-hole copper brazing. Flat-bottom silver brazing has a simpler structure, lower welding stress, and lower required welding temperature, which better preserves the performance of the alloy and steel handle. On the other hand, tail-hole copper brazing can save some carbide material and is cheaper, but the higher welding temperature may cause damage to the carbide properties.

• Welding equipment and process: Using automatic welding machines is a crucial part of the process. In the automatic welding process, the carbide tip and steel handle can automatically align for brazing without manual intervention, greatly ensuring the stability of the welding quality and excellent coaxiality between the steel handle and carbide tip after welding.

Why is Flat-Bottom Silver Brazing Technology Critical for Carbide Burrs?

The most common failure in rotary files is "head-breakage" at the welding point. At BABOS, we eliminate this risk by utilizing advanced Flat-bottom Silver Brazing Technology.

Unlike standard welding methods, our process involves:

• Maximized Surface Contact: The flat-bottom design ensures 100% contact between the carbide head and the steel shank, creating a bond that is significantly stronger than traditional pointed or irregular joints.
• Premium Silver Solder: We use high-grade silver brazing filler, which offers superior thermal conductivity and shock resistance, preventing the tool from loosening due to heat expansion during heavy-duty grinding.
• Zero-Breakage Guarantee: This precision welding technique ensures that our tools can withstand high RPMs and extreme lateral pressure, providing industrial distributors and end-users with a reliable, "zero-risk" performance.

As a company with over ten years of experience in carbide material research and development, Chengdu BABOS Cutting Tools has a deep understanding of carbide material performance. During the welding process of rotary burrs, we use fully automated flat-bottom silver brazing technology, which greatly protects the alloy's performance and ensures excellent coaxiality between the steel handle and the carbide tip.

Writen by: Villa Wang

LinkedIn: https://www.linkedin.com/in/villa-wang-938973339