Robotic welding question

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I am trying to gain a better understanding of how welding robots are used/programmed in an automated setting - in particular real world examples.  I am not a seller of anything, fyi.  Any suggestions on the right forum for this is welcome as well.Question 1:  For the welding robot systems with real time quality sensors, if a specific weld registers as a "fail" are they programmed to move to an alternate location that can be welded and allow the workpiece to pass on move on the line?  I am thinking of systems where a welding robot is making multiple welds.Thanks
Reply:No, generally what would happen in that scenario is the robot would exit to a known "safe point", either through programmed escape routes (Required complex programming, but very efficient) or by backtracking the previous welds until it returns to start of program (Very time consuming) Until it is free of the part and fixture.  Then the operator would get notified that there was a weld error, where it was, and go in the cell to inspect.  He would have a variety of options from there, depending on how the line functions. It would be rare that the robot would just skip to the next weld for obvious quality control reasons.  He might restart the weld, do a manual repair, or scrap the part.Have we all gone mad?
Reply:Can somebody recommend laser (seam searching) sensor manufacturer for arc welding robots?We have an ABB robot, and I looking for a searching solution.I'm in contact with ServoRobot company, they produces laser sensors, but I need more offer.For example Cloos robots use their sensors.Do anybody have welding robot with laser sensor?