Eddy Current Test Penetrant Test Magnetic Particle Test Visual Test
Radiographic Test Ultrasonic Test Magnetic Flux Leakage Test Visual Test Using Fibrescope

       
Eddy Current Test Principle Application Advantage Limitation
       
Principle Back
Eddy current test involves the process of inducing small electrical currents into a conductive article and observing the interaction between the article and current.

Corrosion Pitting inside Heat Exchanger Tube

Crack inside Heat Exchanger Tube
       
Application - Weld discontinuities near the surface (i.e. cracks, porosity, fusion). Back
  - Alloy content, heat treatment variations. wall thickness, and plating or coating thickness.  
       
Advantage - Relatively expedient, with instantneous results. Back
  - Automation possible for symmetrical parts.  
  - No couplant required.  
  - Probe does not have to be in intimate contact with test piece.  
  - Skilled interpretive personnel  
       
Limitations - Limited to conductive materials. Back
  - Shallow depth of penetration.  
  - Some indications may be masked by part geometry due to sensitivity variations.  
  - Reference standard required.