How are filler rods typically identified?

Filler rods are primarily identified by their alloy numbers, which are typically stamped or etched onto the rod itself. This identification method is crucial as it provides immediate and specific information about the composition and properties of the filler material. The alloy number helps welders select the appropriate filler rod for a given application, ensuring compatibility with the base materials being welded and compliance with the desired mechanical properties and corrosion resistance.

While color coding on packaging may provide a quick visual reference for grouping types of filler rods, it is not a reliable or standardized method for identifying the specific alloy. Similarly, assessing rods by physical size and weight can be misleading, as various rods may have the same dimensions but differ significantly in their alloy compositions. Manufacturer labels can provide information but are not the most precise way to identify the filler rod since the labels may vary from one manufacturer to another. The alloy number remains the most universally recognized and trusted method for accurate identification.