What material determines the AWS classification of a filler rod?

The AWS classification of a filler rod is primarily determined by the type of alloy used in its composition. This classification serves to standardize the terminology and properties of the filler materials utilized in welding processes. For instance, different alloys possess unique characteristics such as strength, corrosion resistance, and weldability, which are crucial for matching the filler material to the base metal being welded. The classification system also indicates the mechanical properties and intended applications of the filler rod, ensuring that welders select appropriate materials for specific jobs.

While options like diameter, welding process, and manufacturer standards are relevant in the context of welding, they do not play a role in the AWS classification itself. The diameter specifies the size of the rod for practical use but does not influence the classification designation. The type of welding process indicates how the material will be used but is separate from the material classification. Manufacturer standards may dictate quality and consistency but do not affect the fundamental classification of the alloy. Thus, the type of alloy is the key factor in determining the AWS classification of a filler rod.