Which metal is commonly used as a filler in welding?

Copper is commonly used as a filler metal in welding due to its excellent electrical and thermal conductivity, making it ideal for applications involving electrical components or requiring strong heat transfer. Additionally, copper is known for good corrosion resistance and weldability, which are important qualities in many welding processes.

In welding applications, copper can be used as a filler material particularly in brazing and soldering, where it can bond different metals together. Its properties allow for strong joints that can withstand high temperatures and stresses, enhancing the overall integrity of the weld.

While other metals like iron, nickel, and aluminum are indeed used in various welding applications, they do not serve as the most common filler metals due to their specific properties and the types of materials they are typically used to weld. This specificity makes copper a standout choice in scenarios that require effective filler materials.