Diagnosing of Welded Joints Using Passive Magnetic Method
Jacek Dybała , Krzysztof Nadulicz
AbstractWelding is one of the basic methods of combining construction materials. Since the quality of welded joints translates into the possibility of load transfer through structures, welded joints are naturally objects of diagnostic tests. The main objective of the welded joints research is the search of their weak link, that is to say finding and assessment of areas where there are metal discontinuities. In these places, aggregate impact of stresses arising during welding and stresses arising under operational load of object occur. The existence of the natural Earth’s magnetic field as well as the fact, that the materials of critical elements of construction are largely ferromagnetic materials allows for obtaining diagnostic information concerning the structure with the use of magnetometers. The article presents a method of passive magnetic survey of welded joints based on the analysis of the distribution of diagnosed object’s own magnetic field. The essence of the method is the measurement and interpretation of the local magnetic field disturbances caused by the occurrence of the local stress in the material, local plastic deformation of the material or the presence of material discontinuities, both mechanical (crack, stratification) and structural (inclusions of other materials). The article shows that the presented diagnostic approach allows for performing a quick quality check of welded joints without the need for special preparation of welded joints for diagnostic testing, which is of great utility importance and which translates directly to the low cost of such research.
|Publication size in sheets||0.5|
|Book||Timofiejczuk Anna, Łazarz Bogusław, Chaari Fakher, Rafał Burdzik (eds.): Advances in Technical Diagnostics, vol. 10, 2018, Springer International Publishing, ISBN 978-3-319-62041-1, [978-3-319-62042-8], 521 p., DOI:10.1007/978-3-319-62042-8|
|Keywords in English||Magnetic diagnostics, Passive methods, Welded joints|
|License||Publisher website (books and chapters only); published final; ; after publication|
|Score|| = 15.0, 25-09-2018, BookChapterMatConf|
= 15.0, 25-09-2018, BookChapterMatConf
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