The filler rod used in braze welding is usually made of which material?

In braze welding, the filler rod is commonly made of bronze due to several important properties that this material possesses. Bronze, an alloy typically made up of copper and tin, offers excellent thermal conductivity and a strong bond when melted and applied to a joint. This is crucial for braze welding, as the filler metal needs to flow into gaps between the base materials and form a durable connection under heat.

Additionally, bronze has good corrosion resistance, which improves the longevity of the welded joint, especially in applications exposed to challenging environmental conditions. Its properties allow it to adhere well to various metals, making it versatile for use in different braze welding tasks, ranging from plumbing to automotive applications. The melting point of bronze is also lower than many steels but higher than that of aluminum, contributing to effective welding without damaging the base materials.

While brass, aluminum, and alloy steel may be used in some welding contexts, bronze is specifically favored in braze welding applications for its unique advantages that align well with the requirements of creating strong, reliable joints.