Note: Brazing copper and brass valve assemblies (HVAC)

Objective:

Heating copper and brass valve assemblies to 1300 °F (704 °C) for a brazing application

End Product:

Brass valve assembly

Equipment:

Ambrell EASYHEAT 8310, 10kW 150-400 kHz induction heating system equipped with a remote heat station containing two 1.5 μF capacitors A four-position helical induction heating coil designed and developed specifically for this application 

Materials:

Copper tube (1/8 in /3.2mm) Flared copper tube (1/4 in /6.4mm) Brass fitting Braze rings (1/8 in /3.2mm) 

Temperature:

1300 °F (704 °C)

Frequency:

280 kHz

Testing:

The copper tube (1/8 in /3.2mm) was inserted into the flared copper tube (1/4 in /6.4mm). Two braze rings were placed on the copper tubes and the power supply was turned on and heating began. The heat cycle for the brazing process was 10-15 seconds. Two braze rings instead of one ensured a good quality joint. A second brazing application involved brazing the 1/8 in /3.2mm copper tube to the brass fitting. Two braze rings were placed on the joint area and the part was heated. The heat cycle time was also 10-15 seconds.

Benefits:

  • Speed: The proposed process met the client"s time objective

  • Production rate: Given the fast cycle time, the client can meet its production rate goals

  • Part quality: A good braze joint was formed in both cases, which is critical to ensuring a good quality valve

Brazing copper and brass valve assemblies (HVAC)

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