There is an increasing need for intelligent welding repair in industry. Currently, welding repair tasks are primarily conducted by human workers. A group of smart manufacturing engineers, namely, students in this class, is investigating the possibility of developing a human-robot collaboration system for such tasks. (30 points total) (a) Why have welding repair tasks not been automated yet? What are the challenges? (10 points) (b) When designing such a human-robot collaboration system, what strengths of human and robot are leveraged? Please provide a justification. (10 points) (c) Compared to other human-robot collaboration systems, what unique sensors are needed? Please provide TWO examples. (10 points)