What are filler materials in welding?

Filler materials in welding are substances added to the weld pool to enhance the strength, integrity, and properties of the joint being formed. They can include rods, wires, or powders that are melted along with the base metals during the welding process. Filler materials are crucial for bridging gaps, ensuring proper fusion, and achieving desired mechanical and chemical characteristics in the final weld. The choice of filler material depends on the base metals being joined and the specific requirements of the application.