Brazing is a core skill in refrigeration and air conditioning. Good technique produces strong, leak-free joints; poor technique causes leaks and internal contamination that haunt a system for years.
Preparation
- Cut pipe squarely and deburr it
- Clean the joint surfaces
- Ensure a correct, snug fit between the pipes
- Set up a flow of oxygen-free nitrogen through the pipe to prevent internal oxide scale
Brazing technique
Heat the joint evenly to the correct temperature, then apply the filler rod so it’s drawn into the joint by capillary action — let the heat of the pipe melt the rod, not the flame directly. Use the appropriate filler for the materials being joined. Avoid overheating, which weakens the joint.
After brazing
Allow the joint to cool naturally, then pressure test with nitrogen and inspect for leaks before evacuating and charging. Always work safely — proper PPE, ventilation, and fire precautions, especially near flammable refrigerants.
FAQ
Why flow nitrogen while brazing? It prevents oxide scale forming inside the pipe, which would otherwise circulate and block components like the expansion valve and filter drier.
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