ELECTROMAGNETIC ACOUSTIC TRANSDUCER (EMAT) WELD INSPECTION

摘要

A method and an assembly for inspecting welds between welded tubular ends comprises arranging a series electromagnetic acoustic transducer (EMAT) (7a, 8a, 7b, 8b) assemblies in circumferential direction adjacent to an inner and/or outer surface of at least one of the welded tubular ends and inducing the EMAT assemblies to transmit sequentially or simultaneously acoustic shea r wave signals towards the weld and to detect the shear waves reflected by and/or passing through the weld while the EMAT assemblies are maintained in a substantially fixed position relative to the weld such that at least a substantial part of the weld is scanned by the EMAT assemblies instantly aft er the weld is made.