ISO 17640-2017 pdf free.Non-destructive testing of welds – Ultrasonic testing – Techniques, testing levels, and assessment.
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, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5577, Non-destructive testing — Ultrasonic testing — Vocabulary
ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel
ISO 11666:2010, Nan-destructive testing of welds — Ultrasonic testing— Acceptance levels
ISO 16810, Non-destructive testing — Ultrasonic testing — General principles
ISO 16811, Non-destructive testing — Ultrasonic testing — Sensitivity and range setting
ISO 16826, Non-destructive testing — Ultrasonic testing — Examination for disconeinuities perpendicular to the surface
ISO 17635, Non-destructive testing of welds — General rules for metallic materials
ISO 23279, Non-destructive testing of welds — Ultrasonic testing — Characterization of discontinuities in welds
EN 12668 (all parts), Non-destructive testing — Characterization and verification of ultrasonic examination equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5577 and ISO 17635 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
5 Principle
The purpose of this document is to describe general techniques of ultrasonic weld testing, using standard criteria, for the most commonly used welded joints at object temperatures in the range 0 °C to 60 °C. The specific requirements of this document cover the test equipment, preparation, performance of testing, and reporting. The parameters specified, in particular those for the probes, are compatible with the requirements of ISO 11666 and ISO 23279.
If the joined parts are not of equal thickness, the smallest thickness shall be considered. The techniques used shall be specified.
6 Information required prior to testing
6.1 Items to be specified
These include:
a) method for setting the reference level;
b) method to be used for the evaluation of discontinuities;
c) acceptance levels;
d) testing level;
e) manufacturing and operation stage(s) at which the testing is to be carried out;
f) qualification of personnel;
g) extent of the testing for transverse discontinuities;
h) requirements for additional tandem testing (according to ISO 16826);
i) parent metal testing prior to and/or after welding;
j) whether or not a written test procedure is required;
k) requirements for written test procedures.
6.2 Specific information required before testing
Before any testing of a welded joint can begin, the operator shall have access to the following essential information:
a) written test procedure, if required (see 6.3);
b) type(s) of parent material and product form (i.e. cast, forged, rolled);
c) manufacturing or operation stage at which testing is to be made, including heat treatment, if any;
d) time and extent of any post-weld heat treatment;
e) Joint preparation and dimensions;
1) requirements for surface conditions;
g) welding procedure or relevant information on the welding process;
h) reporting requirements;
I) acceptance levels;
6.3 Written test procedure
The definitions and requirements in this document normally satisfy the need for a written test procedure.
Where this is not the case, or where the techniques described in this document are not applicable to the weld joint to be tested, additional written test procedures shall be used, if required by specification.
7 Requirements for personnel and equipment
7.1 Personnel qualifications
Personnel performing testing in accordance with this document shall be qualified to an appropriate level in ultrasonic testing in accordance with ISO 9712 or equivalent in the relevant industrial sector.
In addition to a general knowledge of ultrasonic weld testing, personnel shall also be familiar with testing problems specifically associated with the type of welded joints to be tested.
7.2 Test equipment
Any equipment used for testing in conjunction with this document shall comply with the requirements of EN 12668 (all parts).
7.3 Probe parameters
7.3.1 Test frequency
The frequency shall be within the range 2 MHz to 5 MHz and shall be selected to consider the properties of the test object and to comply with the specified acceptance levels, for example, of ISO 11666.
Higher frequencies may be used to improve range resolution if this is necessary when using standards for acceptance levels based on characterization of discontinuities, e.g. ISO 23279.
Lower frequencies may be used for testing at long sound paths and/or when the material shows high attenuation.
7.3.2 Angles of incidence
When testing is carried out with transverse waves and techniques that require the ultrasonic beam to be reflected from an opposite surface, care shall be taken to ensure that the angle between the beam and the normal to the opposite reflecting surface is between 350 and 700. Where more than one beam angle is used, at least one of the angle-beam probes used shall conform to this requirement. One of the beam angles used shall ensure that the weld fusion faces are tested at, or as near as possible to, normal incidence. ISO 17640 pdf free download.