AUTOMATIC WELDING METHOD OF CIRCUMFERENTIAL JOINT

摘要

PURPOSE:To stabilize a welding quality and to save labors by detecting the groove shape with rocking an optical distance sensor at the front of a weld part and by deciding the delay timing and symmetry timing to the succeeding layer conditions based on the detected shape thereof. CONSTITUTION:The optical distance sensor 8 to rock in about right angles direction with a welding line is arranged at the front part of the fixed distance from the weld zone and the processing unit 11 of the distance signal and arithmetic unit 12 are connected. The groove shape is detected with high accuracy with rocking the sensor 8, with receiving the continued distance signal at a minute pitch and with the combination of this signal and the sensor position signal. The target position of the torch 7 and welding conditions are set and temporarily memorized based on this sectional shape. A proper delay timing is then decided with counting the pulse signal transmitted from and encoder. Further by providing the mark of weld starting position a symmetry timing is decided. With this method the labor saving in welding and the stabilization of quality are enabled.