Under frame side sill and carbody of rolling stock structures are designed for preventing corrosion in order to meet
mechanical requirements. However during long operation time more than 30 years, there are corrosion in the under
frame side sill caused by environmental effect, vibration and etc. So, detection and evaluation of the corrosion in the
under frame nondestructive is one of important and extending their life time. So, in this study, we have investigated
performance of pulsed eddy current testing method by measuring thickness variation of fabricate of carbody and under
frame for rolling stocks. And then, the process of evaluating remaining life according to testing of corrosion amount is
introduced.
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