Saipem S.p.a.

Prima Electronics S.p.a.

Luca Di Stefano

Domenico Peiretti

Antonio Belloni

Francesco Sgandurra

A process for automatically tracking a joint bevel during butt welding of coaxial pipes includes the steps of observing electrical parameter values relating to the voltage, current and voltaic arc impedance and comparing these values with preset sample values stored in a governing unit. The governing unit controls a driving source for the orientation of the welding torch in the joint bevel.

Automatic tracking process of the joint bevel for the butt welding of

An absolute position transducer (encoder) comprising an incremental encoder having a coded disk connected stably to a shaft, and connected to a sensor for emitting a signal for each complete turn of the disk The incremental encoder produces a first and second signal, each consisting of a sequence of pulses in which each pulse equals one elementary angular increment of the shaft, and a third signal (ZERO) consisting of a sequence of zero pulses, each emitted for each complete turn of the shaft. The absolute encoder comprises a resettable counter for counting the signal emitted by the sensor and memorizing the number of turns of the shaft in a permanent memory; and a control circuit enabled by a zero pulse generated by the incremental encoder, and cooperating with a coding circuit for emitting a coded dummy zero pulse in such a manner that, in the interval between the zero and dummy zero pulses, the first or second signal supplies a decoding circuit with a number of pulses equal to the number stored in the memory of the count circuit.

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Turin, Italy

Luca Di Stefano