Note: Brazing carbide rotary file to steel shanks
Objective:
Braze carbide rotary file assemblies with uniform concentricity in an aerospace application
End Product:
Rotary file assembly
Equipment:
Ambrell 2 kW induction heating system, equipped with a remote heat station containing two 0.33 µF capacitors (total 0.66 µF) An induction heating coil designed and developed specifically for this application.
Materials:
Carbide blank High speed steel shank Temperature indicating paint Braze shim and black flux
Temperature:
1400°F (760°C)
Frequency:
252 kHz
Testing:
A multi-turn helical coil is used. The part is heated to determine the time required to reach the desired temperature and required heat pattern. It takes approximately 30 - 45 seconds to reach 1400°F (760°C) depending on the various part sizes. Flux is applied to the entire part. A braze shim is sandwiched between the steel shank and carbide. Induction heating power is applied until the braze flows. With proper fixturing, concentricity of the part can be achieved.
Benefits:
Repeatable, consistent precise heat
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