Steel base metal to be welded under this standard shall conform to which requirements?

• A. CSA W40
• B. CSA or ASTM requirements
• C. CSA W48
• D. ASTM A36

Answer: (B)

Steel base metal for welding is governed by the material specifications that define its chemical composition and mechanical properties. In this standard, the base metal is acceptable as long as it conforms to a CSA or an ASTM base-metal specification. This openness to either CSA or ASTM specs reflects practical practice: many projects source steel from either organization, and the welding procedures, filler metals, and post-weld properties are all tied to those material standards.

Choosing a single CSA standard or a single ASTM grade would be too restrictive, since there are many suitable base metals used in structural welding beyond those specific options. Verifying the actual material specification (often via the mill test report) ensures the metal meets the required properties for the weld design and service conditions.