ISO 15549:2019 pdf free download – Non-destructive testing一Eddy current testing一General principles.
Additionally, a reference datum can he required to clearly locate the position of any reportable discontinuities.
12 Examination
12.1 Steps in the examination
The detailed steps of the examination shall he defined in the examination procedure (see 13.2).
12.2 Examination coverage
The surface of the product shall be scanned in accordance with the requirements of the application document
(see 13.2) or following a written procedure agreed aL the time of enquiry and order.
The following should preferably he included:
the area to he scanned or. alternatively, the area which cannot be scanned:
the direction of scanning:
– the type of probe and the probe size:
the speed of the probe relative to the surface:
the width of coverage of the probe.
The degree of coverage of the surface is determined by the width of coverage of the probe and can also be influenced by the data acquisition rate of the instrument and the speed of the probe relative to the surface. For complete coverage of the surface without any missed area, two consecutive scanning lines shall not be distant by more than the probe coverage.
12.3 Signal characterization
In order to be able to make a decision, examination results shall be correlakd with features of the tested product such as cracks, wear and physical properties.
Application documents or a procedure, agreed at the time of enquiry and order, shall therefore include:
the type of scanning: manual or mechanized:
— recording requirements:
evaluation requirements:
— reporting requirements.
Signals are analysed with respect to characteristics, such as the amplitude, the phase or the combination of both in defined ranges.
Classification of indications can then range from a simple mechanized sorting device to a classification using a multiparameter correlation technique based Ofl more than one calibration curve.
12.4 Acceptance criteria
The acceptance criteria and the subsequent action for the product shall be defined in the application documents (see t32_) or in a written procedure agreed at the time of enquiry and order.
13 Documentation
13.1 General
The documentation consists ol the examination procedure and the examination report.
13.2 Fxamination procedure
The general requirements for the application and use of the eddy current method for a product are described m
application documents such as:
product standards:
specifications;
codes of practice;
— contractual documents.
The examination procedure is derived from these documents and describes all the essential parameers as well as the precautions to be observed. The following shall be included:
the purpose of the examination:
a description of the product to be examined:
-the application documents;
-details of the qualification and certification of the personnel;
-the area to be examined;
-the scanning plan:
-details of surface preparation:
-the environmental conditions:
-details of reference pieces;
-the arrangement of the exaniinat ion system;
-the verification intervals for the instrument and the probe:
-the requirements for signal evaluation.