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One problem we have been dealing with is the laser has trouble "seeing" the seam now and then due to reflectivity of the galvanized material we are welding. We found a few solutions, but none yet yield 100% consistency.
Also, since time is of essence, we can't let the robot scan each part looking for seams to weld. Hence, the CAD dump. It tells the robot where the welding seam should be. The laser only corrects for inaccuracies between the design and reality.
That's why you need multiple camera for depth perception of the robot.