Experience on axle defects
Experience on axle defects
Experience on axle defects
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GB NDT Axle Testing & Defect Types Found.<br />
• In the past <strong>axle</strong>s have suffered corrosi<strong>on</strong> fatigue <strong>defects</strong>, although<br />
the issue found now is mainly corrosi<strong>on</strong>. The corrosi<strong>on</strong> pitting to<br />
start a crack can be quite small (See example photographs below<br />
and the actual samples here to examine or hand around).<br />
• Examples –mid span crack – (MK 2 coach <strong>axle</strong> found in 1985).<br />
Another small crack is located next to the broken open main crack<br />
from a corrosi<strong>on</strong> pitted area.<br />
• Mk 3 coach <strong>axle</strong> (transiti<strong>on</strong> radii cracks)<br />
• Potash <strong>axle</strong> severe corrosi<strong>on</strong> (mid-span cracks)<br />
• Note:- Toilet chutes adjacent to <strong>axle</strong>s in the past have allowed <strong>axle</strong>s<br />
to be c<strong>on</strong>taminated and serious cracks have been quickly induced.<br />
This also applies to wag<strong>on</strong> <strong>axle</strong>s carrying corrosive substances.
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