| 摘要 |
An apparatus for welding the adjoining ends of annular work members, such as lengths of pipe, employing an arc nozzle for melting and depositing metal in the gap between said adjoining ends. A drive motor coupled to the nozzle drives the nozzle laterally back and forth across the gap while the current that flows in said arc is integrated to generate a physical representation of magnitude of the integral. Means are provided to arrest the motor each time the magnitude reaches a predetermined threshold value, and to reverse the direction of travel of the motor.
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