Induction brazing heats electrically conductive parts in an electromagnetic field. This field is produced by alternating current flow in an induction coil. By selecting an appropriate frequency and power density parts, operators selectively heat assemblies at the surface or to various depths. Additionally, heating can be selectively localized to minimize metallurgical charges in the assembly and reduce distortion. Thermal-Vac engineers and operators have the working knowledge to properly design heating coils and select the appropriate impedance for quality braze joints.
Induction heating can be conducted in air with minimum discoloration. Controlled atmosphere induction brazing is available when necessary. Thermal-Vac commonly joins carbon alloy and stainless steels, copper alloys, and nickel alloys. Silver braze filler metals are most frequently used for induction brazing of steels and nickel alloys. Copper-phosphorus filler metals are used for copper alloy brazing. Appropriate flux is selected that is compatible with the parent and filler metals. If possible, wire, or foil braze filler metal preforms are used to precisely control the amount of metal fed into the joint.
Industry standards for hydrogen brazing include:
- Mil-B-007883C, Type II
- AWS C3.5: 1999
