|Principles||A non-contact device that generates an ultrasonic pulse in the part or sample inspected. The waves reflected by the sample induce a varying electric current in the receiver. Any faults or cracks reflect the ultrasonic pulse. This return pulse is interpreted by software to evaluate the internal structure of the sample |
Based on the response time, the depth of each crack can be calculated and a profile of the interior of the sample can be created.
|How and where is it used?||Inspection of metal through coatings, pollutants, oxidation and surface roughness|
Inspection of extreme hot or cold temperatures
Deployable via automated inspection apparatus
Detection of cracks, general and isolated wall loss and pitting
Interior crack detection
Thickness measurement without contact
|ASTM E1774-96 Standard Guide for Electromagnetic Acoustic Transducer (EMAT)|
ASTM E1816-96 Standard Procedures for Ultrasonic Examination using Electromagnetic Acoustic Transducer (EMAT) technology
ASTM 1962-98 Standard Test Methods for Ultrasonic Surface Examination using Electromagnetic Acoustic Transducer (EMAT) technology
|Form of report or deliverable?||Detailed images|
|Advantages||No couplant required|
Dry inspection method
No contact required, allows measurement of in-service piping
Less sensitive to surface conditions
Useful in detecting internal conditions that might otherwise be missed with conventional ultrasonic methods.
Acuren has integrated EMAT with AUT C-Scan to allow rapid change-over for prove up scanning on piping systems permitting production rates up to 1,500 linear feet per day.
|Limitations||Limited to metallic or magnetic products|
Size constraint due to large size of EMAT transducers
|Certifications of technicians performing the work?|
|Rope access applicable?|