Experience on axle defects
Experience on axle defects
Experience on axle defects
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GB NDT Axle Testing & Defect Types Found.<br />
• The corrosi<strong>on</strong> levels <strong>on</strong> GB wag<strong>on</strong> <strong>axle</strong>s are generally light unless they are<br />
working in a c<strong>on</strong>taminated envir<strong>on</strong>ment.<br />
• However corrosi<strong>on</strong> in the transiti<strong>on</strong> radii is an issue regarding wag<strong>on</strong> <strong>axle</strong>s,<br />
as according to the standard it is not allowed and attempting to polish out is<br />
comm<strong>on</strong>, but does not always succeed.<br />
• Sometimes skimming out of corrosi<strong>on</strong> is allowed providing there is enough<br />
tolerance in the <strong>axle</strong> drawing to do so and it is accepted as OK by a<br />
Technical Competent Authority.<br />
• In-service Eddy Current using certain equipment can identify corrosi<strong>on</strong><br />
areas under paint as well as finding fatigue <strong>defects</strong> (see photograph below).<br />
• If the corrosi<strong>on</strong> depth is above 0.5 mm then the Eddy Current technique is<br />
very noisy and cannot be applied.
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