A fabrication shop holding CSA W47.1 Division 2 certification is asked to undertake a project involving the welding of structural steel members for a bridge. The project specifications mandate that all welding be performed by welders qualified to SMAW F4 electrodes in the 3F (vertical up) position, on material with a minimum tensile strength of 480 MPa. During a review of the company's internal documentation, it is found that a qualified welder had only passed a 3F test using F3 electrodes. What action is required under CSA W47.1 for this welder to be compliant with the project requirements for the F4 electrodes?

Question: A fabrication shop holding CSA W47.1 Division 2 certification is asked to undertake a project involving the welding of structural steel members for a bridge. The project specifications mandate that all welding be performed by welders qualified to SMAW F4 electrodes in the 3F (vertical up) position, on material with a minimum tensile strength of 480 MPa. During a review of the company's internal documentation, it is found that a qualified welder had only passed a 3F test using F3 electrodes. What action is required under CSA W47.1 for this welder to be compliant with the project requirements for the F4 electrodes?

Answer options:

• The welder's previous 3F qualification satisfies the project requirements, as F4 is a similar classification. ✅ The welder must undergo a new qualification test specifically for SMAW F4 electrodes in the 3F position.
• The company can apply for a special permit to allow the use of F3 electrodes for this specific project.
• The welder's supervisor can perform an in-house evaluation to confirm competence with F4 electrodes.

Correct answer: The welder must undergo a new qualification test specifically for SMAW F4 electrodes in the 3F position.

Explanation: Under CSA W47.1, electrode classifications within the F-numbers have specific qualification requirements. A qualification with F3 electrodes does not automatically qualify a welder to use F4 electrodes, especially if the project specification specifically calls for F4 and the base material has a higher tensile strength. The welder must perform a new qualification test with F4 electrodes in the required position to meet the project's WPS and CSA W47.1 requirements for applicable F-numbers.