| 摘要 |
A method for performing automatic circumferential welding around the circumference of a butt joint of a fixed pipe or the like. First, an initial set-up operation is performed wherein a welding head is moved around the welding circumference while producing pulses indicative of the amount of movement of the welding head. The number of pulses required to move the welding head one complete revolution is counted. Next, angles at which the welding conditions are to be changed are specified. These angles are converted to the form of pulses from a start point using the number of pulses previously counted. For the actual welding operation, pulses are again counted while moving the welding head. Each time the pulse count reaches one of the specified angles, a controller instructs a new set of welding conditions to the welding head.
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