Hello Atik Islam ,

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Copper-to-copper brazing with copper-phosphorus filler rods can be done without flux, the material can be cold-worked, and the filler is applicable for large joint clearances, see the PDF document at the following URL: https://www.copper.org/applications/marine/cuni/pdf/Broschuere_Loeten_ENG.pdf . Use the FIND function in your PDF reader to search for the term 'phosphorous'.

Regards,

Thomas Cuff