Induction Brazing Carbide to Steel

Induction Brazing Carbide to Steel  Objective: Braze a carbide sleeve to a steel 'T' shank Material :2.0" (51mm) OD carbide sleeve, 1.0" (25.5mm) high braze joint, 1.5 " (38 mm) steel 'T' , 50% silver braze ring Temperature: 1292 ºF (700 ºC) Frequency: 257 kHz Equipment • DW-UHF-6KW-I induction heating system, equipped with a remote workhead containing two 0.66μF capacitors for a total of 1.32 μF. • An induction heating coil designed and developed specifically for this application. Process 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. Results/Benefits Induction heating provides: • Hands-free brazing which requires no special operator skills for manufacturing • 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.