Which document contains the qualification requirements for welders?

The welder qualification record is the correct choice because it specifically outlines the qualification requirements that a welder must meet to be deemed competent for a particular welding process and application. This document provides essential details about the welder's skills, the processes they have been qualified for, and the conditions under which they were tested. It is crucial in ensuring that the welder’s capabilities align with the requirements of the projects they will be involved in, thereby maintaining the integrity and safety of the welds produced.

The other options, while relevant to the overall welding process, do not directly provide the qualification requirements for welders. A welding procedure specification details the welding methods and parameters but does not assess or record a welder’s qualifications. A quality control plan outlines the measures to ensure quality during the welding process but does not specify individual welder qualifications. An equipment specification sheet provides information on the equipment used but does not pertain to the qualification of the personnel executing the welding tasks.