For eddy current testing characteristics of austenitic stainless steel tube elbow of the boiler heating surface

saddle array eddy current sensors and reference blocks were designed and made

and ET-556H multi-frequency eddy current analyzer were improved.The best parameters of eddy current testing of austenitic stainless steel tube elbow for boiler heating surface were proposed by experiment.The eddy current testing technique is easy to operate

and can improve the detection resolution and sensitivity.Especially it is with high sensitivity for 0.4mm deep circumferential linear defects and 0.5mm deep axial linear defects of outer surface of austenitic stainless steel.