NDE OF CREEP DAMAGE AT SEAM WELDS VIA MAE

Abstract This paper presents magnetoacoustic emission measurements taken on creep-damaged seamwelded pipe. Measurements were made with portable field-usable equipment on a special pipe that was strongly creep-damaged on one end but essentially undamaged on the other end. The MAE voltage decreased as the C-core magnetizing magnet was moved from the undamaged end to the damaged end of the pipe. The results suggest that magnetoacoustic emission is reduced as a result of the presence of creep damage at and near the seam weld. This agrees with recent modeling predictions,