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
Induction Brazing Steel Pipe
Objective: To heat a stainless steel pipe, ferrule and elbow assembly to 1400°F (760°C) within 20 seconds for brazing.
Material 6"(152.4mm)long x 0.5"(12.7mm) diameter stainless steel conduit, 0.5"(12.7mm) long x 0.5"(12.7mm) diameter ferrule, 2"(50.8mm) elbow with 0.5" (12.7mm) diameter
Temperature 1400°F (760°C)
Frequency 400 kHz
Equipment • DW-UHF-6KW-I induction heating system equipped with a remote workhead • An induction heating coil designed and developed specifically for this application.
Process: A specially designed, three-turn helical coil is used to provide heat to the assembly at the braze joint area. Two small silver solder braze rings are placed at each joint; the joints are coated with black flux to insure that the braze material flows cleanly. The assembly is placed inside the coil and power is applied for 15 seconds to cause the braze to flow.
Results/Benefits: Induction heating provides: • Consistent and repeatable results • No flame process • Faster process time
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.
Brazing Golf Ball With Induction
Objective: Heating steel golf ball mold to brazing dimple insert
Material: Golf ball mold 2” in diameter, braze flux paste, dimple insert
Temperature: 1400 ºF (760 ºC)
Frequency: 260 kHz
Equipment • DW-UHF-10kW induction heating system, equipped with a remote workhead containing two 0.5μF capacitors for a total of 0.25 μF
• An induction heating coil designed and developed specifically for this application.
Process A four turn helical coil is used to heat the golf ball mold to 1400ºF (760 ºC) in 3 minutes and the dimple insert is brazed to the mold with braze flux paste.
Results/Benefits Induction heating provides:
• No flame process.
• Reliable, repeatable, non contact and energy efficient heat in minimal time.
• Even distribution of heating.
Induction Brazing Steel To Carbide Plate
Objective Brazing a steel piston valve assembly
Material Steel piston valve 4.5” dia (11.43cm), tungsten carbide plate and braze
Temperature 1350 ºF
Frequency 100 kHz
Equipment •DW-UHF-40kW induction heating system, equipped with a remote workhead containing six 1.0μF capacitors for a total of 1.5μF
• An induction heating coil designed and developed specifically for this application.
Process A five turn pancake coil is used to braze the piston valve and tungsten carbide plate. The assembly was heated for 10 minutes to flow the braze and join the two pieces.
Results/Benefits Induction heating provides:
• Rapid localized heat, which can minimize oxidation and reduce cleaning after joining
• Hands-free heating that involves no operator skill for manufacturing
• Clean and controllable joints
• Produces high quality repeatable parts
Induction Brazing Steel Tips with Hihg Frequency Heating System
Objective To heat a steel tip and shank assembly to 1300°F (704°C) within 3 seconds for brazing with induction heating instead of torch brazing.
Material 0.1” (2.54mm) diameter steel tip & shank, 0.07” (1.78mm) diameter braze ring
Temperature 1300°F (704°C)
Frequency 800kHz
Equipment DW-UHF-4.5kW induction heating system, remote heat station containing one 1.2 microfarad capacitor.
Process A two turn helical coil is used to braze the dental parts. The braze ring is placed at the joint area of the steel tip and shank. Black flux is applied to the joint area. RF power is applied for 3 seconds to heat the parts to the established target temperature and the braze paste flows evenly and consistantly.
Results/Benefits Induction heating provides:
• Fast, accurate, repeatable heat
• Ability to heat very small areas within precise production tolerances
• Better joint quality, reduced oxidation
• Increased production rates and reduced labor costs
