Note: Brazing two aluminum pipes to an aluminum evaporator core

Objective:

Brazing two aluminum pipes simultaneously to an aluminum evaporator core 

End Product:

Evaporator core

Equipment:

Ambrell 10 kW induction heating system, equipped with a remote workhead containing two 1.5μF capacitors for a total of 0.75μF An induction heating coil designed and developed specifically for this application.

Materials:

2 aluminum pipes 0.72 in (18.3mm) diameter evaporator core 9.88 inx 10.48 inx 1.5 inthick (251mm x 266.3mm x 38mm) braze rings

Temperature:

610 °F (321 °C)

Frequency:

251 kHz

Testing:

A four turn helical pancake coil is used to heat the 2 pipes simultaneously. Three braze rings are placed on each joint and power is applied for 90-100 seconds to create a leak proof joint on both pipes.

Customer is requiring a 40 seconds heat time for both brazes. In order to meet this requirement 3 units will be utilized to braze 2 joints each for a total of 6 joints in 90-100 seconds. The customer is currently using a flame process which can burn away the thin flange at the joint area and create scrap parts. By switching to induction for this application the customer is decreasing their scrap parts and also increasing their quality and production rate.

Benefits:

  • Repeatable leak free joints

  • Increased part quality, less scrap

  • Hands-free heating that involves no operator skill for manufacturing

  • Even distribution of heating 

Brazing two aluminum pipes to an aluminum evaporator core

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