Filler metals and allied materials are classified under which CSA standard?

• A. CSA W48
• B. CSA W59
• C. CSA W47.1
• D. CSA G40.21

Answer: (A)

Filler metals and allied materials are standardized under CSA W48. This standard defines how welding consumables—such as electrodes, wires, fluxes, and shielding gases—are classified, tested, and specified, since these materials become part of the weld metal itself. It’s the CSA reference focused on the materials used to create the weld, rather than on the welding procedure, welder qualifications, or structural steel requirements.

CSA W59 deals with welding steel structures and related process requirements, CSA W47.1 covers welder qualification and certification, and CSA G40.21 concerns structural steel quality and product certification. Because the question is about the materials used to fill and shield the weld, W48 is the best fit.