Note: Brazing a stainless steel shaft to a carbide - mining digger

Objective:

Brazing a cone shaped carbide to a stainless steel shaft for a digger 

End Product:

Digger

Equipment:

  • Ambrell 10 kW 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. 

Materials:

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:

277 kHz

Testing:

A three-turn helical coil is used to braze the carbide to the shaft. The steel 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. 

Benefits:

  • Rapid localized heating only where needed

  • Creates clean, controllable joints

  • Hands-free heating that involves no operator skill for manufacturing

  • Even distribution of heating 

Brazing a stainless steel shaft to a carbide - mining digger

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