[en] This paper aims at assessing of weld defects in standard petroleum pipelines by using shearography method. Shearography technique reveals the stress-affected zone due to additional loading that can be realized by the laser speckle correlation on the inspected object. In this study, the artificial defects in weld pipeline is modeled by creating root concavity and undercut defects of different location and sizes. An internal air pressure was exerted to the 7 mm thick pipe wall. The results show that change of internal pressure is an effective means to reveal defects activity in the weld pipelines. The speckle correlation for root concavity and undercut defect with ΔP≥0.24 MPa can clearly be observed. For comparison, the radiography technique is used to correlate the shape and size of the defects and finally to detect the location of defects in weld area. (author)