Ok. Validation should consist of;
1. Explanation of the repair
2. Documentation in the form of a traveler or job list describing the steps and hold points for repair; removal of defects, verification of removal of defects, validation of materials of construction, welding procedure specification, filler metal and welder qualification certs and NDT reports.
3. Code of construction used for preheat and any PWHT requirements.
4. Copies of nondestructive testing (NDT) reports to validate removal of defect and completion of welding.