Note: Brazing brass tube and fitting assemblies

Objective:

To heat two brass tube and fitting assemblies for a brazing application 

End Product:

brass tube and fitting

Equipment:

Ambrell EASYHEAT 10kW 150-400 kHz induction heating system equipped with a remote workhead containing two 1.0 μF capacitors A single position four-turn helical induction heating coil designed and developed specifically for this application

Materials:

Customer supplied small brass tube (0.31 in /7.9mm) Customer supplied large brass tube (0.875 in /22mm) Customer supplied fittings Black flux 

Temperature:

1350 °F (732 °C)

Frequency:

338 kHz

Testing:

This smaller assembly was fluxed and placed into the induction heating coil. A braze pre-form was placed onto the tube and the induction power was turned on. After 28 seconds the braze pre-form had flowed and made a perfect fillet. The parts were then rinsed with warm water to remove the flux and brushed with a wire wheel. The larger assembly was assembled, fluxed and placed into a different four-turn helical coil. In 2 minutes and 20 seconds the braze flowed into the joint and formed a perfect fillet. Testing for both assemblies was initially done with a 6kW EASYHEAT. It was determined that both parts could achieve temperature within 28 seconds with a 10kW EASYHEAT.

Benefits:

  • Speed: The parts heated to temperature considerably more quickly than they did with their previous heating method: a torch

  • Part quality: Induction"s repeatability resulted in improved part quality

  • Safety: Induction is flameless and introduces less heat into the production environment than torch brazing 

Brazing brass tube and fitting assemblies

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