Defects in Flash Butt Welds
(a) Transverse cracks:
The origin of these cracks is the imperfection in the weldment such as lack of fusion, inclusions, etc. Fracture usually occurs from these imperfections, which may be in railhead, web or foot. During the course of its propagation USFD testing is extremely effective.
(b) Horizontal cracks:
These cracks develop in the web and propagate both in head and foot. The principal cause is large tensile residual stresses acting in the vertical direction.
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