Brazing corrugated tubing to stainless steel pipe and cap using UltraFlex Induction Heating

PUBLISHED: 12 Oct 17

Brazing corrugated tubing to stainless steel pipe and cap using UltraFlex Induction Heating
Brazing corrugated tubing to stainless steel pipe and cap using UltraFlex Induction Heating

UltraFlex Power Technologies has recently demonstrated the process of achieving strong and durable joints using a fast induction heating cycle.

The goal of the demonstration was to braze corrugated tubing to a stainless steel pipe on one end and to a stainless steel cap on the other end, using the company's 5-15 kW Induction Heating system from the UltraHeat W series. A 4-turn coil was custom designed to optimize the heating process for this application.

To braze the cap to the corrugated tubing, one pre-formed braze alloy ring, made from Harris Safety-Silv 45 brazing alloy was used. If additional strength was required at the braze joint, extra rings could be inserted. Brazing flux was applied to the end of the corrugated tubing, where the brazing alloy would sit. The cap was then placed onto the tubing and positioned inside the center of the induction heating coil. With the alloy starting to flow at the target temperature of 1400°F (760°C), small pressure was applied onto the cap to position the cap evenly over the corrugated tubing. The heating process was completed within 20 seconds, using power of 9.83 kW and frequency of 104 kHz.

To braze the stainless steel pipe to the corrugated tubing, brazing rings were applied to the inside of the pipe and brazing flux was applied to the end of the corrugated tubing. The pipe was then placed over the tubing and the center of the braze positioned in the center of the induction coil for heating, at the same target temperature of 1400°F (760°C). This heating process was completed within 26 seconds, at frequency of 106 kHz and using 9.77 kW power. In this case, the weight of the pipe should provide enough pressure so it may be seated evenly on the tubing when the alloy begins to flow.

The brazing demonstration showed that strong and durable joints could be achieved within less than 30 seconds using induction heating. In this fast heating process, a selective and precise heat zone could be defined, resulting in less part distortion and joint stress. Using induction heating, the customer who asked for these UltraFlex demonstrations could achieve more consistent brazing results and large volume production, without the need for batch processing.

Ultraflex Power Technologies, USA
Tel: + 1 631 467 6814
Email: sales@ultraflexpower.com
Web: www.ultraflexpower.com

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