What responsibility does the master plumber have regarding welders?

The responsibility of assigning ID symbols or numbers to welders is crucial for several reasons. This practice fosters accountability and traceability in plumbing work and welding tasks, enabling the master plumber to efficiently manage the workforce. It ensures that each welder can be identified for their specific contributions to projects, which is vital for quality control and safety compliance.

By assigning identification to welders, the master plumber can also effectively track who is responsible for certain tasks and maintain records of work performed. This helps in monitoring the welding process in relation to building codes and standards, ultimately ensuring that all work meets regulatory requirements. Identification also aids in evaluating a welder's performance and skills, which is important for workforce management and future training needs.

While the other options involve various aspects of responsibility and support within a plumbing operation, assigning ID symbols or numbers provides a direct mechanism for oversight and accountability, which is inherently important in ensuring safety and compliance in plumbing projects.