Note: Brazing a carbide and steel shank for a plug guage
Objective:
Braze a carbide sleeve to a steel shank
End Product:
Plug gauge
Equipment:
Ambrell 2 kW induction heating system, equipped with a remote workhead containing two 0.66 μF capacitors for a total of 1.32 μF. An induction heating coil designed and developed specifically for this application
Materials:
2.0 in (51mm) OD carbide sleeve 1.0 in (25.5mm) high braze joint 1.5 in (38 mm) steel in T" 50% silver braze ring
Temperature:
1292 °F (700 °C)
Frequency:
257 kHz
Testing:
A pancake/helical combination coil is used to heat the assembly. The coil design allows easy loading and unloading of the parts without having to rotate them. A few minutes after the start of the heat cycle the heat pattern normalizes and becomes very uniform. For better joint quality a chamfered groove is machined in the steel shank to locate and seat the braze ring. The braze alloy flows into the joint creating a strong, aesthetic bond. The amount of braze alloy heated each cycle is controlled well by the braze ring.
Benefits:
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Hands-free brazing which requires no special operator skills for manufacturing
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Precise, even heat is applied and is divided equally between the shank and the carbide. This provides an even flow of the braze alloy as the parts reach brazing temperatures.
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