Open Access

Table 2

Experimental and calibrating conditions.

ECT probe Cross coil
Operation mode Differential
Frequency (kHz) 250, 500, 1000
Atmosphere In air
Calibration block Alloy 600 (20 mm in thickness)
 EDM slit
  Length (mm) 80
  Depth (mm) 1
  Width (mm) 0.3
Calibrated
 Output voltage (V) 2
 Phase angle (°) 90

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