Note: Brazing a steel tube and fitting assembly
Objective:
To braze a steel connector onto a steel tube to create a hydraulic component. The tube would need to be heated to 1350 °F (732 °C) within 10 seconds.
End Product:
Hydraulic component
Equipment:
Ambrell EASYHEAT LI 3542, 4.2 kW, 150-400 kHz induction heating system equipped with a remote heat station containing one 0.5 μF capacitor. A single position, three-turn helical induction heating coil designed and developed specifically for this application.
Materials:
Flux Braze Steel 0.5 in (12.77 mm) OD tube (Assembly 1) Steel 0.5 in (12.77 mm) fitting (Assembly 1) Steel 0.25 in (6.35 mm) OD tube (Assembly 2) Steel 0.25 in (6.35 mm) fitting (Assembly 2)
Temperature:
1350 °F (732 °C)
Frequency:
339 kHz
Testing:
The steel tube and steel fitting was placed in the three-turn helical coil with flux applied, and the 4 kW EASYHEAT LI 3542 was turned on. A good heat pattern for braze joints at the target temperature was achieved within eight seconds.
Benefits:
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Improved control: The company was outsourcing, and desired more process and quality control, which will be achieved via bringing the process in-house and using induction heating
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Reduced expenditures: Through bringing the process inhouse, the provider has greater control over costs
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Higher production rate: With the target temperature being reached at a faster rate than expected, production will exceed initial expectations
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