Brazing Aluminum to Aluminum

The objective of the application test is brazing Aluminum to Aluminum in less than 15 seconds. We have aluminum tubing and an aluminum “receiver”. The brazing alloy is an alloy ring, and has a flow temperature of 1030F.

Equipment

Ultraheat UPT-S5 Power Supply

HS-4 Heat Station

Induction Coil

Materials

• Aluminum tube: 0.167” OD, 0108” ID

• Aluminum component: ID .1675”, depth .288”,

chamfer at top area is 0.2375” ID max

• Braze alloy in the form of two-turn alloy ring

• Flux

Key Parameters

Temperature: 1030F

Power: 2 kW

Time: 14 seconds

Frequency

107 kHz

Process:

The Aluminum component and tube were assembled together with the alloy ring. Flux was added.

The part was positioned in the induction coil.

Several tests were conducted with different cycle times to confirm the heating time for a good braze.

At 15 seconds the assembly melted.

At 14 seconds, we had success for brazing aluminum to aluminum, and a good quality braze joint was achieved.

Results/Benefits:

The 5 kW system requested by the customer, will meet the customer’s time requirements for brazing.

Precise control of the time and temperature

Power on demand with rapid heat cycles

Repeatable process, not operator dependent

Safe heating with no open flames

Energy efficient heating