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 1.12โ (28.4mm) dia, 1.5โ(38.1mm) tall,ย stainless steel shaft 1.12โ (28.4mm) dia and various length, blackย brazing flux and braze shims
Temperature 1500 ยบF (815 ยบC)
Frequency 277 kHz
Equipment โข DW-UHF-10ย kW induction heating system, equipped with a remoteย workhead containing two 1.0ฮผF capacitors for a total of 0.5ฮผF
โข An induction heating coil designed and developed specifically forย this application.
Process A three turn helical coil is used to braze the carbide to the shaft. Theย steel shaft is fluxed and the braze shim placed on top. The carbideย tip is fluxed and placed on top of the shim, lining up the countersunkย hole in the carbide. The hole is not fluxed because the flux outgasesย and causes the carbide to build up pressure and attempt to repelย from the shaft. Power is applied for 85 seconds for the braze shim toย flow and make a good joint.
DAWEIโs customer has a customerย who is unhappy with the braze quality of their digger so ourย customer is looking for a better quality brazing process.ย DAWEIโsย customer is very happy with the sample brazedย diggers and the help he received from the Ameritherm lab inย developing his brazing process.
Results/Benefits Induction heating provides:
โข Rapid localized heating only where needed
โข Creates clean, controllable joints
โข Hands-free heating that involves no operator skill forย manufacturing
โข Even distribution of heating
