Article Article
Magnetic Flux Leakage Testing Using Distribution of Magnetic Field on the Section Area of Welding

Welding is a method to join two materials using heat and pressure. It has several advantages such as efficient joining, air tightness, water tightness, and oil tightness. Therefore, welding is widely used to manufacture tubular-type transmission towers. However, stress concentration, welding damages, corrosion, and fatigue can cause fractures. These damages can be inspected using a magnetic flux leakage testing method. However, it is difficult to evaluate the damage quantitatively using these results because the distribution of magnetic field, which is measured on a weld surface, changes depending on the types, shapes, sizes, positions, and directions of damage. Therefore, this research studies the distribution of magnetization in the sectional area of the weld including: residual magnetization and its changes due to external load on the weld line and external magnetic field.


[1] KEPRI report, 2012, Investigation of Failures of 154 kV Tubular-type Transmission Tower.

[2] Dubov A., Kolokolnikov S., 2012, “Assessment of the Material State of Oil and Gas Pipelines Based on the Metal Magnetic Memory Method,” Welding in the World, 56(3), pp 11-19.

[3] Roskosz M., Rusin A., Kotowicz j., 2010, “The metal magnetic memory method in the diagnostics of power machinery componen,” Journal of Achievements in Materials and Manufacturing Engineering, 43(1), pp 362-370.

[4] Nagarkar V., Gordon J, Vasile S., Gothoskar P., Hopkins F., 1996, “High resolution X-ray sensor for non destructive evaluation,” Nuclear Science Symposium and Medical Imaging Conference Record, 43, pp 1559-1563.

[5] Ito Y., Masuda T., Nagao K., Matsuoka K., 1997, “Ultrasonic testing system for ERW mill,” IAS '97, 2, pp 866-872.

[6] Le M., Kim J., Kim S., Lee J., 2016, “Nondestructive Testing of Pitting Corrosion Cracks in Rivet of Multilayer Structures,” International Journal of Precision Engineering and Manufacturing, 17(11), pp 1433-1442.

[7] Uchanin V., Najda V., Hristoforou E., 2011, “The Development of Eddy Current Technique for WWER Steam Generators Inspection,” InTech, pp 145-164.

[8] Le M., Lee J., Jun J., Kim J., 2013, “Quantitative evaluation of corrosion in a thin small-bore piping system using bobbin-type magnetic camera,” Journal Nondestructive Evaluation, 33(11), pp 56-63.

[9] Mix P.E., 2005, “Magnetic Flux Leakage Theory,” in Introduction to nondestructive testing: a training guide, ed: Wiley-Interscience, pp. 73-78.

[10] Le M., Lee J., Jun J., Kim J., 2013, “Nondestructive testing of train wheels using differential-type integrated Hall sensor matrixes embedded in train rails,” NDT&E Int., 55, pp 28-35.

[11] Dubov Anatoly, Dubov Alexandr., Kolokolnikov Sergey, 2013, “Application of the metal magnetic memory method for detection of defects at the initial stage of their development for prevention of failures of power engineering welded steel structures and steam turbine parts,” Weld World, 58, pp 225-236.

[12] Dubov A.A, 1995. Diagnostics of boiler tubes with usage of metal magnetic memory. Moscow: Energoatomizdat, pp 112.

Usage Shares
Total Views
153 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage