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ASTM E 1816 Document Information:
Title
Standard Practice for Ultrasonic Testing Using Electromagnetic Acoustic Transducer (EMAT) Techniques
ASTM International
Publication Date:
Jul 1, 2007
Scope:
This practice covers procedures for the use of electromagnetic
acoustic transducers (EMATs) for specific ultrasonic examination
applications. Recommendations are given for specific applications
for using EMAT techniques to detect flaws through both surface and
volumetric examinations as well as to measure thickness.
These procedures recommend technical details and guidelines for
the reliable and reproducible ultrasonic detection of flaws and
thickness measurements using electromagnetic acoustic transducers
for both the pulsing and receiving of ultrasonic waves. The EMAT
techniques described herein can be used as a basis for assessing
the serviceability of various components nondestructively, as well
as for process control in manufacturing.
These procedures cover noncontact techniques for coupling
ultrasonic energy into materials through the use of electromagnetic
fields. Surface, Lamb, longitudinal, and shear wave modes are
discussed.
These procedures are intended to describe specific EMAT
applications. These procedures are intended for applications in
which the user has determined that the use of EMAT techniques can
offer substantial benefits over conventional piezoelectric search
units. It is not intended that EMAT techniques should be used in
applications in which conventional techniques and applications
offer superior benefits (refer to Guide E 1774).
These procedures are applicable to any material in which
acoustic waves can be introduced electromagnetically. This includes
any material that is either electrically conductive or
ferromagnetic.
The procedures outlined in this practice address proven EMAT
techniques for specific applications; they do not purport to
address the only variation or all variations of EMAT techniques to
address the given applications. Latitude in application techniques
is offered where options are considered appropriate.
The values stated in inch-pound units are to be regarded as the
standard. The values given in parentheses are for information
only.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- electrically conductive
- electromagnetic acoustic transducer
- ferromagnetic
- flaw detection
- nondestructive testing
- NDT of weldments
- thickness measurements
- ultrasonic examination
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