A smarter approach to brazing and soldering with controlled induction heating
Induction brazing and soldering are among the most widely used modern manufacturing processes. Applying heat with efficiency and precision is critical to producing the heat exchangers, electronics and many other parts we rely on every day. Achieving the desired heating pattern, however, requires careful control of magnetic fields and coil design.
Fluxtrol’s soft magnetic composite (SMC) materials help engineers control and concentrate magnetic flux in induction brazing and soldering systems. By shaping the field around the induction coil, they let manufacturers optimize heating efficiency, reduce energy consumption and protect nearby components from unintended heating. The result is a more stable, repeatable process that improves both product quality and production efficiency.
Why induction heating for brazing and soldering?
Induction heating offers several advantages over traditional methods. Because the electromagnetic field induces heat directly in the workpiece, energy is delivered precisely where it’s needed. Heating cycles can often be completed in seconds, and the process is highly repeatable and well suited to automation. There are no open flames and no direct contact with the part, which improves workplace safety and reduces the risk of contamination.
Even so, designing an effective induction brazing system can be challenging. Inefficient coil designs, stray magnetic fields and uneven energy distribution can cause overheating of nearby components, inconsistent joint temperatures or excessive energy use. Addressing these problems comes down to better control of magnetic flux in the induction system.
Improving brazing performance with soft magnetic composites
SMCs act as magnetic flux controllers, guiding and concentrating the field in specific areas around the coil. By directing flux toward the workpiece, the right SMC increases heating efficiency and reduces energy losses. It also limits stray fields that could otherwise heat nearby components or reduce overall system performance.
Fluxtrol SMCs are versatile and integrate into a wide variety of systems: many coil geometries, frequencies and workpiece materials. They can be machined into custom shapes, so engineers can tailor flux control to the requirements of each process. Typical results include:
- Improved concentration of heating energy
- Reduced stray magnetic field
- Lower overall energy consumption
- More consistent brazing results
- Faster heating cycles and, in many cases, longer service life for induction equipment
Controlling magnetic flux to improve induction heating systems
In many applications, magnetic flux does not naturally concentrate where heat is most needed. Without proper control, some energy is lost to stray fields or spread unevenly across the workpiece. Integrating magnetic flux controllers made from SMCs lets engineers guide the field toward the desired heating zone, delivering energy more efficiently and improving overall heating performance.
Fluxtrol SMCs for induction brazing applications
Real-world improvements in induction brazing with magnetic flux control
Optimizing brazing of squirrel cage rotors
Brazing is widely used for electric motor components such as squirrel cage rotors, where the filler must flow without damaging adjacent rotor parts. Simulation and magnetic flux control were used to optimize the coil configuration and concentrate energy at the brazing locations.
- Improved temperature uniformity
- Reduced overheating of surrounding components
- Greater process consistency
- More efficient energy use
Computer-assisted design for aluminum brazing
Aluminum's high thermal conductivity and narrow processing window demand careful system design. Computer-assisted modeling evaluated inductor designs and flux configurations before the final system was built.
- More predictable heating patterns
- Reduced development time
- Improved energy efficiency
- Enhanced process stability
Frequently asked questions
What is induction brazing?
What is the difference between brazing and soldering?
What are the advantages of induction brazing?
Because heat is generated directly in the workpiece, energy is delivered exactly where it’s needed. That means:
- Faster heating cycles and higher throughput
- Precise localized heating that protects nearby components
- Better repeatability and automation compatibility
- Reduced oxidation and cleaner joints
- Lower overall energy consumption