ernicrmo-3 filler metals,filler metals are used in welding and brazing processes to provide material for creating a secure joint between two adjacent surfaces. also known as welding rods, brazing rods, filler rods, welding wire, and stick electrodes, the filler metal is heated until it flows between the surfaces. as it cools, the filler metal fuses with the workpiece material to create the joint. filler metals can be shaped as rods or wire depending on the specific type of welding process or brazing process being used. they also come in a range of materials to help ensure compatibility with the workpiece material. they are often used with welding flux, a powder that protects the workpiece metal against ignition and aids in heat transfer. filler metals are commonly used for repair, manufacturing, construction, or fabrication applications.