What is the function of a filler material in welding?

The function of a filler material in welding is primarily to provide additional material in the joint. When two base materials are welded together, the filler material helps to fill the gap between them, ensuring a more robust connection. This is particularly important for achieving a strong weld as it allows for the formation of a continuous interface between the joined pieces.

Filler materials can also help to improve the mechanical properties of the weld joint, such as strength and ductility, and they can be specifically chosen to match the composition of the base metals, which aids in achieving optimal bonding and performance characteristics. The addition of filler material is essential in processes such as TIG and MIG welding, where the joint's integrity relies on the adequate amount of material being applied.

Other options like purifying metals, reducing weight, or improving electrical conductivity do not describe the primary role of filler materials in welding. While filler materials may provide some incidental benefits in these areas, their main purpose is to add material to ensure effective bonding of the components being welded.