Which document confirms the structural integrity of welds and their history?

The document that confirms the structural integrity of welds and their history is QA Form 20B (Part C). This form is specifically designed to capture detailed information about the welding process, including the qualifications of the welders, the results of inspections, and the history of the welds involved in the project. It ensures that all necessary quality standards are met and provides a comprehensive record that can be referenced later for safety and compliance purposes.

Moreover, the distinction of this form as the correct choice lies in its emphasis on documenting the specific aspects of weld integrity, which are critical during audits, inspections, and maintenance phases. By having a thorough history and validation of welds, stakeholders can ensure that the structural components hold up to safety regulations and engineering requirements, ultimately contributing to the reliability and durability of the structure being built.