Defects in Alumino-Thermic (AT) Welds
(a) Transverse crack in head and foot: It is caused by inclusions entrapped during welding, which leads to crack initiation on the foot and its growth in the web region causing fracture. Such cracks can be detected by USFD.
(b) Horizontal cracks in web: These cracks occur in AT welds in which the ends having bolt holes have not been removed. The presence of holes result in unfavorable stress distribution caused due to non-uniform cooling. USFD can easily detect such flaws.
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