Can I use acetylene to braze aluminum refrigeration pipes without flux using aluminum rods?
Md Ariful Islam
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Dr. Md Rushad Rahman
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For refrigeration pipes, it's best to fit another pipe with a larger diameter between the 2 pieces of copper to create a sleeve. You do need to use flux with copper pipes. Apply the flux along the joint where the larger pipe meets the 2 thinner pipes, and use a silver welding or brazing rod to seal the 2 joints.
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