Induction Brazing Carbide To Stainless Steel Shaft With IGBT Heating Units
Objective Brazing a cone shaped carbide to a stainless steel shaft for a digger
Material Cone shaped carbide 1.12ā (28.4mm) dia, 1.5ā(38.1mm) tall,Ā stainless steel shaft 1.12ā (28.4mm) dia and various length, blackĀ brazing flux and braze shims
Temperature 1500 ĀŗF (815 ĀŗC)
Frequency 277 kHz
Equipment ā¢ DW-UHF-10Ā kW induction heating system, equipped with a remoteĀ workhead containing two 1.0Ī¼F capacitors for a total of 0.5Ī¼F
ā¢ An induction heating coil designed and developed specifically forĀ this application.
Process A three turn helical coil is used to braze the carbide to the shaft. TheĀ steel shaft is fluxed and the braze shim placed on top. The carbideĀ tip is fluxed and placed on top of the shim, lining up the countersunkĀ hole in the carbide. The hole is not fluxed because the flux outgasesĀ and causes the carbide to build up pressure and attempt to repelĀ from the shaft. Power is applied for 85 seconds for the braze shim toĀ flow and make a good joint.
DAWEIās customer has a customerĀ who is unhappy with the braze quality of their digger so ourĀ customer is looking for a better quality brazing process.Ā DAWEIāsĀ customer is very happy with the sample brazedĀ diggers and the help he received from the Ameritherm lab inĀ developing his brazing process.
Results/Benefits Induction heating provides:
ā¢ Rapid localized heating only where needed
ā¢ Creates clean, controllable joints
ā¢ Hands-free heating that involves no operator skill forĀ manufacturing
ā¢ Even distribution of heating
