Note: Brazing a magnetic steel tube and mating assembly
Objective:
Heating a 0.437 in (11.1 mm) outside diameter magnetic steel tube and steel mating assembly to temperature for a brazing application to create an oil tube for the railroad industry
End Product:
Oil tube
Equipment:
Ambrell EASYHEAT 7590 LI, 7.5kW 150-400 kHz induction heating system equipped with a remote heat station containing one 1.5 μF capacitors A split helical induction heating coil designed and developed specifically for this application
Materials:
Customer supplied 0.437 in (11.1 mm) O.D. steel tube and steel mating part Customer supplied braze ring Black braze flux
Temperature:
1350 °F (732 °C)
Frequency:
212 kHz
Testing:
The joint area was fluxed with high temperature brazing flux. The coil was then positioned to heat the joint area and the power was turned on. The joint area was heated in 25-30 seconds with a stepped heat profile in it was heated for 10 seconds at 300 amps and then heated for 15-20 more seconds at 190 amps. The braze material became visible at the top of the joint area, which indicated completion of the process. The assembly was removed and cooled with water and then bead-blasted to clean the assembly.
Benefits:
-
Process: Induction heating to braze the assembly proved to be a fast, repeatable heating method
-
Control: The client wanted to bring this process inhouse to enable them to have more control over product quality
-
Part quality: The end user was impressed with the quality of the part
-
Free lab testing: Ambrell"s Lab Service Request testing enabled the client to test their application to ensure induction heating would meet their expectations
Visit our Applications Lab to learn more about free applications testing.
1655 Lyell Ave, Rochester, NY 14606 USA | Tel: +1 585 889 9000