Electrode position control method for tandem arc welding, robot controller for tandem arc welding system, and tandem arc welding system

摘要

An electrode position control method according to the present invention includes a voltage detecting step of detecting voltages on a leading electrode and a trailing electrode that are brought into contact with a welding workpiece, a sensing step of detecting positional information of the welding workpiece from electrical changes in the voltages, a correction amount calculating step of calculating a correction amount for correcting for positional displacement of each of the leading electrode and the trailing electrode with respect to a weld line from the positional information, and a position correcting step of correcting the respective positions of the electrodes by adding or subtracting the correction amount.