A project under CSA W59 requires welds on structural steel members to be non-destructively examined by UT (Ultrasonic Testing). The specifications call for specific acceptance criteria for discontinuities. What section or annex of CSA W59 would a welding inspector refer to for the detailed acceptance/rejection criteria applicable to ultrasonic testing of welds in structural steel?

Question: A project under CSA W59 requires welds on structural steel members to be non-destructively examined by UT (Ultrasonic Testing). The specifications call for specific acceptance criteria for discontinuities. What section or annex of CSA W59 would a welding inspector refer to for the detailed acceptance/rejection criteria applicable to ultrasonic testing of welds in structural steel?

Answer options:

• Annex A - Qualification and Testing of Welding Procedures
• Clause 6 - Workmanship and Weld Quality ✅ Annex L - Acceptance Criteria for Ultrasonic Testing of Welds
• Clause 10 - Repair Procedures

Correct answer: Annex L - Acceptance Criteria for Ultrasonic Testing of Welds

Explanation: CSA W59 provides specific annexes for detailed information on various topics. Annex L of CSA W59, titled 'Acceptance Criteria for Ultrasonic Testing of Welds', contains the detailed criteria for determining whether discontinuities found during UT are acceptable or require repair. Clause 6 deals with general workmanship, and Annex A is about procedure qualification, neither of which provides the specific UT acceptance criteria.