Descriptionprocess 121 which should

Descriptionprocess 121 which should be a very secure process. The worker preforming the gouging has not gotten to the bottom of the weld, and have not removed the entire mistake, Therefore there are still welding mistakes in the weld, and that are found when another NDT is performed on the repair welding afterward. Some defect location for 3rd repair was not found in 1st and 2nd repair informationRoot cause1. The gouging depth was not enough to reach 5mm deeper than the position of the defects, and MT(or PT) was not performed to check if the defects were removed. The gouging edge didn’t go with an opening and angle, which caused it hard for welders to weld and clean weld interpass.2. CSMC didn’t record the length of the defects properly. If the adjacent defects are within 50mm, they shall be combined and viewed as a defect.Improvements1. CSMC will record and combine the defects within 50mm2. The supervisors shall explain the repair details to relevant welders, grinders on daily toolbox meeting, and related procedures shall be put on site for reference.3. The defects shall be record per weld plan, and use “Repair Map” to identify the repair position and times. Please check attachment for details.