Vacuum Brazing of Tungsten Steel with No. 45 Steel

Vacuum brazing is an efficient and reliable joining method for bonding tungsten steel with No. 45 steel (medium-carbon steel), widely used in cutting tools, wear parts, and heavy-duty mechanical components. These two materials differ significantly in hardness and thermal behavior, making conventional welding difficult and prone to cracking. Vacuum brazing provides a controlled solution with high joint integrity.

The process is performed in a high-temperature vacuum brazing furnace, where an oxygen-free environment prevents oxidation and ensures clean joint surfaces. A suitable brazing filler metal—commonly silver-, copper-, or nickel-based—is placed between the tungsten steel and No. 45 steel. When heated, the filler melts and flows into the joint by capillary action, forming a strong metallurgical bond.

Vacuum brazing minimizes thermal stress and distortion, preserving the wear resistance of tungsten steel and the toughness of No. 45 steel. The finished joint offers high bonding strength, excellent wear resistance, and good mechanical stability, even under heavy loads and repeated impact.

Because of these advantages, vacuum brazing of tungsten steel with No. 45 steel is widely applied in cutting tools, dies, molds, and industrial machinery, where durability, precision, and long service life are essential.