Experience on axle defects
Experience on axle defects
Experience on axle defects
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GB NDT Axle Testing & Defect Types Found.<br />
• Currently corrosi<strong>on</strong> fatigue mid-span <strong>axle</strong> body and wheel seat<br />
transiti<strong>on</strong> radius <strong>defects</strong> <strong>on</strong>ly found occasi<strong>on</strong>ally. The NDT<br />
techniques employed are MPI / Eddy Current inspecti<strong>on</strong>. UAT does<br />
not find these <strong>defects</strong> unless they are gross.<br />
• Note:- Regarding transiti<strong>on</strong> radii corrosi<strong>on</strong> fatigue is where corrosi<strong>on</strong><br />
pitting has occurred where the two radii meet (not at radius bottom<br />
where stress c<strong>on</strong>centrati<strong>on</strong> is deemed to be higher).<br />
• Historically cracks found by UAT at the inner end of the wheelseat<br />
originating from poor design.<br />
• Improved <strong>axle</strong> design and assembly methods (shrink fitting wheels)<br />
have significantly reduced the amount of cracks found in the seat<br />
areas.<br />
• Some freight organisati<strong>on</strong>s now <strong>on</strong>ly apply MPI or similar inspecti<strong>on</strong><br />
i.e. Eddy Current to wag<strong>on</strong> <strong>axle</strong>s at overhaul and cease UAT at<br />
overhaul and in-service.
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