High frequency induction brazing steel tube to steel fitting
Objective
Handheld high frequency induction brazing of a steel tube to a steel fitting
Recommended Equipment
The recommended equipment for this application is the
DW-UHF-6KW-III handheld induction brazing heater heat station.
Materials:
Steel tube to steel fitting braze using Lucas-Milhaupt Easy FLO 3 brazing alloy rings and Harris Black Brazing Flux.
Power: 3.5kW to 6.6kW
Temperature: 1300°F to 1400°F (704°C to 760°C )
Time: 6 to 8 Seconds
Brazing Steel To Steel Pipe With Induction
Objective: To braze O-ring Face (ORFS) sleeve or male connector to a steel tube.
Material
• Steel tube, 1 inch (2.54 cm) OD
• O-ring Face Seal sleeve and a male connector fittings
• Preform braze rings
• White SureFlow flux
• Steel support mandrel
Temperature 1300 ºF (704 ºC)
Frequency 200 kHz
Equipment
• DW-UHF-20KW induction heating system, equipped with a remote workhead containing two (2) 1.5 μF capacitors (for a total of 0.75 μF).
• An induction heating coil designed and developed specifically for this application.
Process A four-turn 2.75 inch (7.0 cm) ID helical coil is used for heating both the steel tube and the ORFS sleeve or the ORFS male connector. This coil is designed to braze either the sleeve or male connector to the tube. The parts to be brazed are assembled with flux and heated for 45 seconds. Pressure is applied to the tube to make sure it is inserted fully into the fittings as the braze ring flows.
Results/Benefits Advantages :
• Large Inner diameter of coil allows for easy loading and unloading of parts
• With efficient energy coupling of the coil to the fittings overheating is avoided.
