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.
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