Copper alloy brazing rods are used for brazing, which is a type of welding that involves joining two metal pieces together with a third, molten filler metal. The filler metal has a lower melting point than the base metals being joined, so it can be melted and flowed into the joint between the two pieces, forming a strong and durable bond. Copper alloy brazing rods are made from a mixture of copper and other metals, such as zinc, tin, or silver, which can improve the strength and corrosion resistance of the brazed joint. They are typically used for joining copper and copper alloys, but can also be used for joining other metals in certain applications. feihongalloys.com