FIELD: metallurgy.
SUBSTANCE: laser beam effects point is tracked from inside by laser transducer. Said laser transducer is used to scan the butt across the weld and at the front of welding zone. Said laser transducer is fitted at the rod inside the pipe. Laser transducer position relative to welding head in horizontal is defined by gyro at said rod or by means of extra laser radiator secured with transducer at said rod, extra radiator beam being directed to fixed TV camera.
EFFECT: higher quality of welding.
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