New York Low Pressure Boiler COF Practice

Which steps are necessary to prepare a brazed joint?

1. Clean, paint, heat, and apply filler

2. Clean, flux, heat, and add filler metal

3. Clean, weld, and cool down

4. Clean, bond, heat, and finish

The correct answer is: Clean, flux, heat, and add filler metal

To prepare a brazed joint effectively, the necessary steps include cleaning the surfaces to remove any contaminants that could interfere with the bonding process, applying flux to facilitate better wetting of the filler metal and to protect against oxidation during heating, heating the joint to the appropriate temperature where the filler metal begins to flow, and finally adding the filler metal to the joint as the surfaces reach the required temperature. This method ensures that the joint achieves strong molecular bonds between the base metals with the filler material becoming part of the joint without melting the base materials themselves. The combination of cleaning, fluxing, controlled heating, and proper application of the filler metal is essential for achieving a reliable and durable connection in brazing processes.