A data processing apparatus for {TAIL ~ processing data} described in a welding operation program of an arc welding robot system, said {HEAD ~ 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 { TAIL ~ processing data } described in a welding operation program of an arc welding robot system , said { HEAD ~ 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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