Induction Brazing a carbide to a stainless steel shaft

Objective : Brazing a cone shaped carbide to a stainless steel shaft for a digger
Material : Cone shaped carbide 1.12” (28.4mm) dia, 1.5”(38.1mm) tall,stainless steel shaft 1.12” (28.4mm) dia and various length, black brazing flux and braze shims
Temperature :1500 ºF (815 ºC)
Frequency :227 kHz
Equipment :
• HF 15kW induction heating system, equipped with a remote workhead containing two 1.0μF capacitors for a total of 0.5μF
• An induction heating coil designed and developed specifically for this application.
Process A three turn helical coil is used to braze the carbide to the shaft. Thesteel shaft is fluxed and the braze shim placed on top. The carbide tip is fluxed and placed on top of the shim, lining up the countersunk
hole in the carbide.
The hole is not fluxed because the flux outgases and causes the carbide to build up pressure and attempt to repel from the shaft. Power is applied for 85 seconds for the braze shim to flow and make a good joint.
Results/Benefits
• Rapid localized heating only where needed
• Creates clean, controllable joints
• Hands-free heating that involves no operator skill for manufacturing

Induction-Brazing-a-carbide-to-a-stainless-steel-shaft