Braze repair is a process used to fix defects in a previously brazed joint.
It involves reapplying braze filler material at a lower temperature to avoid damaging the existing joint.
The area to be repaired must be thoroughly cleaned and prepared before the additional braze alloy is applied.
What is a braze repair process? (6 Steps to Perfect Brazing)
1. Identification of Defects
The first step in the braze repair process is identifying the defects in the brazed joint.
These defects can include incomplete joint penetration, porosity, or misalignment.
2. Cleaning and Preparation
Before any repair can be attempted, the defective area must be cleaned to remove any contaminants, oxides, or residues.
Mechanical cleaning methods such as grinding, wire brushing, or blasting are often used for this purpose.
It is crucial to ensure that no residues from the cleaning media remain on the joint surfaces.
3. Application of Additional Braze Alloy
Once the area is clean, a small amount of additional braze alloy is applied to the defective area.
This is typically done using a method that allows for precise application, such as a paste or wire, to avoid excessive buildup.
4. Lower Re-braze Temperature
The repair is then heated to a temperature that is lower than the initial brazing temperature.
This is to prevent the existing joint from remelting, which could lead to further defects or weaken the joint.
The specific temperature will depend on the materials involved and the type of braze alloy used.
5. Repeating the Brazing Cycle
After the additional alloy has been applied and the temperature has been set, the brazing cycle is repeated.
This involves heating the joint to the appropriate temperature, allowing the alloy to flow and bond with the base materials, and then cooling the assembly.
6. Inspection
Finally, the repaired joint is inspected to ensure that the defect has been successfully corrected and that the joint meets the required specifications.
This may involve visual inspection, non-destructive testing, or other quality control measures.
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