Final answer:
Supervisors in manufacturing should be knowledgeable about weld faults and estimating if these are relevant to their roles, which is essential for product integrity and project management.
Step-by-step explanation:
Each supervisor in a production or manufacturing environment should have a comprehensive understanding of the aspects directly related to their work. Specifically, they should be knowledgeable in weld faults and estimating, if these are relevant to their job duties. Knowledge of weld faults is crucial for ensuring product integrity and safety, while the ability to estimate accurately is essential for project planning and resource allocation.
Quality control is similarly important, but it encompasses a broader spectrum that includes systematic processes to ensure that products meet specific standards of quality. A supervisor's knowledge might indeed extend to quality control techniques or principles, however, the question focuses on areas of knowledge directly related to the supervisor's work. If the supervisor's role involves welding operations and project estimations, then the correct answer to the question is that each supervisor shall have knowledge of both weld faults and estimating