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Magnetic Methods as Applied to Testing a Current State of Welded Joints
| Content Provider | Semantic Scholar |
|---|---|
| Author | Gorkunov, Eduard Putilova, Evgeniia Zadvorkin, Sergey M. |
| Copyright Year | 2016 |
| Abstract | Difficult climatic conditions of operation, stresses and strains arising in all the stages of main pipeline manufacturing process necessitate the creation and development of advanced techniques for diagnosing a current condition of pipes in order to evaluate their durability and reliability. Proceeding from experimentally found differences in the structure and level of the physical-mechanical properties of the base metal, the weld and heat-affected zone materials of welded joints in pipe steels, a welded joint can in magnetic terms be viewed as a multilayer material, and this allows approaches developed for materials of the kind to be used for the diaРnostics. TСe paper studies welded joints of steels Х70 and Х80 used for main oil and gas pipelines. The values of the fields of maximum differential permeabilities on the field dependences are shown to correlate with the different structural states and levels of the physical-mechanical properties of separate zones in welded joints. This may be a basis for the further development of methods for diagnosing the deviations of the structure and level of the physical-mechanical properties of the material from the required state and the detection of the most hazardous zones of a welded joint in terms of possible brittle fracture. Lower sensitivity of magnetic characteristics to applied tangential stresses than to normal ones has been found. At normal stresses ranging between -200 and 200 MPa, more than 10 times exceeding the operating pressure in a pipeline, coercive force, residual induction and maximum magnetic permeability behave uniquely, and this enables them to be used as parameters for evaluating a current state of the separate zones of welded joints in large-diameter pipes. The work was partially supported by UB RAS project No. 15-10-1-22 and the RAS Presidium proРram of basic researcС “Basic Exploratory Scientific ResearcС Intended for DevelopinР tСe Arctic Zone of tСe Russian Federation”. TСe researcСers used tСe equipment of tСe “Plastometriya” collective use center. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.ndt.net/article/wcndt2016/papers/p30.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
