Copper base brazing alloys are divided into four categories: high copper alloy, copper zinc alloy, copper phosphorus alloy and special copper alloy.The brazing alloy is mainly used for gas flame brazing, high frequency brazing, salt bath dip brazing, brazing copper, copper alloy, nickel, steel, cast iron, carbide, etc.Copper-phosphorus alloy is a brazing alloy based on copper-phosphorus two-element alloy with good fluidity.Mainly used for brazing copper and copper alloys, because of the high content of phosphorus, it cannot be used for brazing steel, nickel and its alloys.Adding silver to the copper - phosphorus alloy will greatly improve the wettability of the solder.