Brazing or hard soldering of copper alloys has become a connection science and art today which has many applications in various industries. by increasing the understanding of the nature and behavior of materials, this art of connection has been able to meet many of the needs of the industry Copper-phosphorus powder, which has been produced based on many experiments and researches, is widely used in brazing of cooling copper pipes, air conditioners and electrical conductors that Consumer companies have had good satisfaction from this product, the advantages of this powder are: low melting temperature, high fluidity, resistance to cracking, proper ductility