Trying to braze the fitting will very likely melt the O-ring material and thus introduce contaminants into the system that could cause other system issues, so the fittings should never be brazed.
If the fitting was recently pressed (15-20 minutes) prior to pressurization, it is possible the bubbles are a result of trapped air in the double crimp area that can leak out over time, and IS NOT a fitting leak. This is more likely to occur on smaller fittings. Since the joint is a permanent one, …
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• Verify the tubing does not have scratches, incise marks and dents prior to tube cutting. Be careful when using a knife to cut off plastic shipping caps or insulation off copper tubes. • Take time to cut the tubing properly using a tubing cutter. Rushing through the cutting process may cause dents and oval …
Read more “What should I do to ensure that a fitting doesn’t leak after pressing?”