FIELD: welding processes and equipment, namely welding of magnetized pipelines during restoration works at preliminary demagnetizing of welded butts.
SUBSTANCE: method comprises steps of demagnetizing end zone of pipeline in order to mount defect-free portion of pipeline; concentrating magnetic field in local zone until value of residual magnetic field of pipeline; according to value of concentrated magnetic field creating in material of end zone residual magnetic field acting in direction opposite to magnetic field of pipeline; introducing defect-free portion and performing welding.
EFFECT: enhanced quality of welded butts of magnetized pipelines, lowered time periods of restoration due to elimination of occurring in material of "magnetic blowing" effect.
3 cl, 6 dwg, 1 ex
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