A data processing apparatus for {HEAD ~ processing data} described in {TAIL ~ a welding operation program} of an arc welding robot system, said arc welding robot system including a robot with an arc welding torch attached thereto and said welding operation program being previously set in the robot, said data processing apparatus comprising: 
A data processing apparatus for { HEAD ~ processing data } described in { TAIL ~ a welding operation program } of an arc welding robot system , said arc welding robot system including a robot with an arc welding torch attached thereto and said welding operation program being previously set in the robot , said data processing apparatus comprising :
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