PURPOSE: To prevent the deflection of a conduit, an electric cable, etc. connected to a welding torch and to improve reliability in resetting a welding robot to its origin by correcting the turning of the other driving shaft owing to resetting of either of the driving shafts.

CONSTITUTION: In the case of resetting a link 24 in an arrow C direction to an origin, an operator pushes a direction instructing button for link of a switch box 34 for teaching. Then, a direction instructing signal 100 is outputted from the box 34 through an input-output interface 38 to a central processing unit 40. Said signal is converted to the rotating angle of a motor for driving the link 24 by the unit 40 and is outputted to a control program 42 which calculates the correcting angle of the motor for driving a welding torch 14 in accordance with the rotating angle of said motor and outputs the same to a control part 44 for positioning. As a result, the link 24 is reset accurately to the origin, and since the torch 14 is held in a static state, unnecessary deflection of the conduit 18, electric cable, etc. connected to the torch 14 is prevented.