Brazing cast iron is a process that involves joining 2 pieces of cast iron using a non-ferrous filler metal. The filler metal melts at a much lower temperature than the cast iron, allowing it to form a bond. Brazing resembles a combination between soldering and welding.
Brazing Cast Iron
- Clean the cast iron pieces you intend to braze using either a wire brush or grinder.
- Preheat the metals with the torch for 5 minutes, reaching approximately 300 degrees Fahrenheit. This will remove any moisture in the metal.
- Apply the flux to the joint you are brazing. Add heat until the brazing rod begins to melt. This will create a connection between the two pieces of cast iron. The tighter the created joint is, the stronger the repair.
- Allow the brazed metal to cool at a slow pace by applying heat at lower and lower temperatures. The metal needs to cool for about an hour to relieve stress.
- Finally, allow the metal to cool at room temperature.