When you want to braze two workpieces together, you should first consider their shape, metal type and surface. To choose a suitable alloy and flux, seek advice from the manufacturer.
Induction brazing process criteria
- The service conditions and environment
- The parent materials to be joined
- The join design to be employed
- The dimensions of the joint gap
- The choice of a filler material
- Means of removing oxide films from the surfaces to be joined
- Design of fixture to be used to support components – Provided by UltraFlex
- Induction heating method for brazing – Provided by UltraFlex
- Level of complexity needed in the production equipment to satisfy the production requirement
STEPS of the brazing process:
1. Clean the base metals properly
Any oil, grease, rust or scrap will form a barrier. Make sure to clean the workpieces properly. Oil and grease should be cleaned first. Then you can remove the rust. Cleaning can be done by using a wire brush, degreasing solvent, water or steam. If the surfaces are oxidized, you can also clean them mechanically.
2. Estimate the clearance
The usual clearance (distance) for most filler metals ranges between 0.001 to 0.005 inches (0.0254 mm to 0.127 mm). If the clearance is increased, the joint strength will decrease. The amount of alloy is determined by the clearance gap. It must be enough to fill the void with a very small amount of it left outside.
3. Use flux
When two details are heated up, the possibility of oxidation is increased. When flux is applied to the surfaces, it prevents oxidation. Fluxes come in different forms:
- As a powder or a paste – a brush is used to spread it over the desired area
- As a flux coated alloy
- As a liquid – by a dispenser