| 摘要 |
PURPOSE:To guide a welding head correctly along a weld line and to perform automatic copy welding with high accuracy in the stage of welding a tack welded groove automtically with an automatic copy welding device, by neglecting the lateral displacement in the tack welded part detected with the detection head of a copying device. CONSTITUTION:The lateral and vertical directions of a weld line detected with a detector 18a of a detection head 18 are converted to electric signals and a motor 12 for lateral movement and a motor 15 for vertical movement are controlled in accordance with said signals so that a welding head 17 is controlled always to the correct position of a welding groove 3 having a tack welded part 4 in the stage of tracing the groove 3 with the detection head 18 of an automatic copy welding device. A control circuit which prohibits the movement in the lateral direction with respect to the weld line in the signal detecting the rugged part of the part 4 among the lateral and vertical displacements detected with the detector 18a is provided, whereby the deviation of the head 17 laterally from the weld line is prevented. |
