Note: Brazing a steel and copper strip to carbide

Objective:

To heat a steel and copper strip and carbide to temperature for a brazing application

End Product:

Steel strip, copper strip

Equipment:

Ambrell EASYHEAT 1 kW, 150 to 400 kHz induction heating system equipped with a remote workhead containing one 0.66 uf capacitors for a total of 0.66 uF
A single-position two-turn helical induction heating coil designed and developed specifically for this application 

Materials:

Steel and copper strip
Carbide
Braze wire
Braze shim
White flux 

Temperature:

1300 ºF (704 ºC)

Frequency:

250 kHz

Testing:

The part was fluxed, assembled and put into the coil. A small amount of braze alloy was placed on top of the joint, and the assembly was set on top of a piece of  graphite. While the part alone would not heat due to its small size, the graphite susceptor evenly transferred the heat. A very thin brazing wire gauge was used to control the amount of alloy applied in the joint. It is important to hold the part steady and in place while the flux is bubbling. 

Benefits:

  • Speed: Heating took less than 30 seconds, which cannot be matched when using a torch

  • Precise, repeatable heating: Induction is a highly repeatable process, unlike torch heating

  • Safety: There is no open flame with induction, which makes it a safer method of heating than torch heating 

Brazing a steel and copper strip to carbide

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