Ultrasonic Testing Procedure for Ship Steel Weld Repairs

After completing a welding repair and passing visual inspection, qualified personnel with non-destructive testing (NDT) qualifications will conduct ultrasonic testing (UT) within 24 hours.

Surface Inspection:

• Performed according to CB T3958-2004 Ship Steel Weld Magnetic Particle Testing.* Penetration testing follows the specified process and quality grading.* Acceptance Level: Level II (no cracks, lack of fusion, or linear defects longer than 3mm on the weld surface).

Internal Inspection:

• Conducted according to CB T3559-2011 Ship Steel Weld Ultrasonic Testing Process and Quality Grading.* Inspection Level: B level* Acceptance Level: Level II * Wave height must fall within Zone III. * Hazardous defects are assessed as Level V. * Allowable indications for a single defect: T/2 (minimum 12mm, maximum 36mm).

Upon meeting these requirements, verification and certification will be obtained from the classification society.