Objective
High Frequency Induction Brazing brass pipe to brass part and a brass tip in under one minute using induction.
Equipment
DW-UHF-6KW-III handheld induction brazing machine
2 turns coil
Materials
• Wide brass part
• Brass pipe
• Silver-based brazing alloy, provided by customer
2 turns coil
Materials
• Wide brass part
• Brass pipe
• Silver-based brazing alloy, provided by customer
Test 2 – Pipe to tip:
Key Parameters
Power: 4.4 kW
Temperature: Approximately 1400° F (760° C)
Time: 17 sec
Process:
Test 1
Test 2
Results/Benefits:
Induction heating provides:

- The wide part and brass pipe are assembled and a brazing alloy ring is placed between them.
- The assembly is put inside the induction heating coil and induction heat is applied.
- The joint is completed in 38 seconds.
Test 2
- The tip and pipe are assembled and a brazing alloy ring is placed between them.
- The assembly is put inside the coil and induction heat is applied.
- The joint is completed in 17 seconds.
Results/Benefits:
Induction heating provides:
- Strong durable joints
- Selective and precise heat zone, resulting in less part distortion and joint stress than welding
- Less oxidation
- Faster heating cycles
- More consistent results and suitability for large volume production, without the need for batch processing
- Safer process than flame brazing



Brazing Brass Fittings With Induction
Objective :To heat brass tubing assemblies to 750°C for a brazing application. The tubing diameter varies from 3 to 8 inches (76.2 to 203.2 mm)
Material: Brass tubing Brass flange Braze rings Braze flux
Temperature :1382°F (750°C)
Frequency 200 kHz
Equipment DW-UHF-20KW, 150-500 kHz induction heating power supply, equipped with a remote heat station containing eight 1.0 μF capacitors (total 2.0 μF). A multi-turn helical coil induction heating coil designed and developed specifically for this application.
Process The parts are disassembled. All connections are cleaned and braze flux is applied to the entire surface of the assembly. Before assembling the parts an induction coil is slipped over the tube. The brass coupling is placed over the brass tubes. The flux on the parts is allowed to dry before heating. The induction heating power is applied until the braze flows well at the joint. The assembly heats well to 1382°F (750°C) and melts the braze alloy all around the tube. Heating time is several minutes depending on flange diameter.
Results/Benefits The coil allows heating at the best possible efficiency which reduces the cycle time and the conducted heat along the brass tubes.
