Vacuum Brazing of Mold Steel and Tungsten Steel

Vacuum brazing is an advanced and reliable joining method for bonding mold steel with tungsten steel, especially in tooling and mold-making applications where high strength and wear resistance are required. Since these two materials have very different hardness and thermal expansion characteristics, conventional welding methods often lead to cracking or distortion. Vacuum brazing overcomes these challenges by providing a controlled and stress-minimized joining process.

The process is carried out in a high-temperature vacuum brazing furnace, which creates an oxygen-free environment to prevent oxidation and contamination. A carefully selected brazing filler metal—commonly silver-, copper-, or nickel-based—is placed between the mold steel and tungsten steel components. When heated to the brazing temperature, the filler metal melts and flows into the joint by capillary action, forming a strong metallurgical bond.

Vacuum brazing ensures excellent joint integrity with minimal deformation, preserving the hardness of tungsten steel and the toughness of mold steel. The finished assembly offers high bonding strength, superior wear resistance, and long service life, even under heavy mechanical loads.

Because of these advantages, vacuum brazed mold steel and tungsten steel components are widely used in injection molds, cutting tools, dies, and heavy-duty industrial tooling, where precision and durability are critical.