A welder is assigned to perform a fillet weld on an existing steel structure in British Columbia. The structural drawings specify compliance with CSA W59 for welded steel construction. The welder notices that the base material has a significant amount of rust and mill scale that would interfere with proper fusion. What is the welder's primary responsibility according to CSA W59?

Question: A welder is assigned to perform a fillet weld on an existing steel structure in British Columbia. The structural drawings specify compliance with CSA W59 for welded steel construction. The welder notices that the base material has a significant amount of rust and mill scale that would interfere with proper fusion. What is the welder's primary responsibility according to CSA W59?

Answer options:

• Proceed with welding, assuming the supervisor will inspect the final product.
• Remove the rust and mill scale using a wire brush or grinding before welding.
• Apply excess filler metal to compensate for the surface imperfections. ✅ Inform the supervisor immediately that the joint is not prepared correctly according to W59.

Correct answer: Inform the supervisor immediately that the joint is not prepared correctly according to W59.

Explanation: CSA W59 requires proper surface preparation. Encountering significant rust and mill scale indicates improper preparation. The welder's primary responsibility is to inform the supervisor about the non-conforming condition before proceeding, as it impacts the integrity of the weld and falls under the standard's quality assurance requirements. While removing the scale is a necessary step, the welder must first ensure that the situation is addressed by the appropriate personnel, rather than unilaterally deciding to correct it if it falls outside their scope or authority for remedial action.