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ACFM Equipment：
1） It can be used to find and size surface breaking defects at the same time;
2） It also can be used through non-conductive coatings,and so does not require cleaning to bare
metal and,according does not require the removal of protective coating;
3） The ACFM technique is simpler in operation;
4） It can be used for any geometry by various probes;
5） High inspection accuracy:
Minimum crack depth---0.5mm
Minimum crack length---5mm
6） The minimum working depth is 300m within -20~-50
We have found out 16 cracks on platforms structures in these years.
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