Which of the following must be included in welding inspection reports?

The choice indicating that details of each inspection visit must be included in welding inspection reports is correct because comprehensive documentation of each inspection ensures that all welds are evaluated consistently and thoroughly. This includes capturing observations made during the inspection, the conditions present at the time, and any relevant details that may affect the quality of the weld. By keeping detailed records, inspectors can provide a complete history of the welding activity, which is crucial for tracking compliance with specifications and standards as well as for quality assurance purposes.

Including information about specifics like the techniques used, the equipment checked, and the outcomes of visual and non-destructive tests can help identify patterns or recurring issues, thereby improving overall welding practices and safety. This level of detail supports transparency in the process and provides a valuable resource for future reference, whether for audits or for ongoing training and improvement in welding quality.

Other options focus on narrower aspects that do not capture the full picture needed for a robust inspection report. For example, reporting only nonconforming items or comments on worker performance does not provide a comprehensive view of the inspection process, while the length of completed welds is typically a minor detail that might not reflect overall compliance or quality standards.