ISO 15549:2019 pdf free.Non-destructive testing一Eddy current testing一General principles.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, oniy the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 97 1 2, Non—destructive testing — Qualification and certifIcation QINDTpe1:connel ISO 1 27 1 8’), Non-destructive testing — Eddy current testing Vocahular
ISO 15548—I, Non—destructive testing — Equipment for eddy current exainmation — Part 1: Instrument c/ia racteristics and verification
ISO 1 5 548—2, Non-destructive testing — Equipment for eddy current examination — Part 2: Probe c/ia racteristics and verification
3 Terms and defInitions
For the purposes of this document, the terms and definitions given in ISO 12718 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
ISO Online browsing platform: available at https:f/www.iso.org/ohp
IEC Electropedia: available at http://www.electropedia.org/
4 General principles
The eddy current examination is based upon the induction of an alternating electric current in a conducting material. The quantity measured and analysed is related to the distribution of the induced currents and it is represented by a vector in the complex plane.
The distribution of eddy currents in the depth of a material is governed by physical laws, the density of the currents decreasing drastically with the increasing depth. For a given frequency, this decrease is an exponential function of the depth.
The following properties, alone or in combination, of the product to be tested influence the measured quantity:
— the electrical conductivity of the material;
— the magnetic permeability of the material;
the size and geometry of the product to be tested;
— the geometrical relationship between the eddy current probe and the product to be tested. More detailed information is obtained when the measured quantity is displayed in the complex plane. The method can be applied using the following characteristics:
the method does not involve any physical contact with the product;
— it does not need a coupling medium such as water;
high throughput speeds can be used.
5 Qualification of personnel
Personnel who perform eddy current testing shall be certified in accordance with ISO 9712 or equivalent.
6 Purpose of examination and products to be tested
The purpose of the examination can be one or more of the following:
to reveal discontinuities in the product which could affect its fitness for the purpose:
to assess the thickness of coatings or layers; to assess other geometric characteristics;
to assess metallurgical or mechanical properties of the product; to assess the electrical conductivity and/or permeability of the product;
to sort products on the basis of any of the above-mentioned properties.
Examples of products to be tested are conducting materials such as:
tubes, profiles, bars or wire rods;
components in the automotive and machining industries; forged or cast products;
multi-layer components in the aircraft industry. Examples of the application of the method include:
on-line testing in rolling mills, finishing lines or drawing lines; in-service inspection of the heat-exchanger tubing;
verification of the properties of mass-produced articles and semi-finished products;
maintenance inspection of an aircraft;
inspection of the surfaces of cylindrical holes formed in products.
7 Examination techniques
Examination can be static or dynamic, the latter requiring the relative movement between the probe and the product to be tested.ISO 15549 pdf download.