AS ISO 17643:2020 pdf free download – Non-destructive testing of welds — Eddycurrent testing of welds by complex-plane analysis

AS ISO 17643:2020 pdf free download – Non-destructive testing of welds — Eddycurrent testing of welds by complex-plane analysis.
AS ISO 17643 defines eddy current testing techniques for detection of surface breaking and near surface planar discontinuities. mainly in ferritic materials (weld material, heat-affected zones, base material).
Eddy current testing can also be specified for use with non-ferritic materials, for example in an application standard.
The techniques can be applied to coated and uncoated objects during fabrication and in service, both onshore and offshore.
Eddy current testing can be carried out on all accessible surfaces and on welds of almost any configuration.
Unless otherwise specified at specilic items in this International Standard, the general principles of ISO 15549 apply.
NOTE Eddy current testing Is usually performed In the as-welded condition. However, the accuracy of the results can be affected by very rough surface finishes,
2 Normative references
The following documents, in whole or in part, are normatively referenced In this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
ISO 9712, Non-destructive testing — Qualification and certification of NDT personnel ISO 12718. Non-destructive testing Eddy current testing Vocabulary
ISO 15548-1, Non-destructive testing — Equipment for eddy current examination — Part 1: Instrument characteristics and verification
ISO 15548-2, Non-destructive testing — Equipment for eddy current examination — Part 2: Probe characteristics and verification
ISO 15548-3, Non-destructive testing — Equipment for eddy current examination — Part 3: System characteristics and verification
ISO 15549, Non-destructive testing — Eddy current testing — General principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12718 apply.
4 Personnel qualification
Non-destructive testing shall be performed by qualified and capable personnel. It is recommended that personnel are qualified In accordance with ISO 9712 oran equivalent standard at an appropriate level in the relevant industry sector.
6.4.4 Systematic equipment maintenance
6.4.4.1 Calibration certificate
The ctuIpment (Instrument and probes) shall have a currently valid calibration certificate. This may be issued by the manufacturer, (in accordance with ISO 15548-1 and ISO 15548-2) a recognized calibration laboratory or an authorized agency.
6.4.4.2 Functional check
Maintenance shall follow ISO 15548-3 or a written procedure. The results of maintenance checks shall
be recorded.
6.5 Test procedure
6.5.1 Evaluation mode
The evaluation mode shall use both phase analysis and amplitude analysis of a vector traced to the complex plane display. Evaluation may he by comparison of this display with the reference data previously stored.
6.5.2 Procedure for measuring coating thickness and material comparison relative to calibration block
Connect the probe for absolute measurements to the instrument, Select the appropriate frequency
Set the gain of the instrument in order to obtain a full screen deflection lift-off signal when the probe Is moved from an uncoated spot on the callbratwn block to a spot covered with the maximum coating thickness expected on the structure to be tested.
Set the phase of the lift-off signals to display them as shown on FIgure 2.
The coating thick ness on the raw surface of a weld is never constant, As it will influence the sensitivity of crack detection, It Is necessary to get an estimate of the maximum coating thickness In the heat• affected zone prior to the eddy current testing of the weld.
The llft•ofl signal obtained from the component to be tested shall be similar to the signal obtained From the calibration block. le. it shall be within S either side of the reference signal (see Figure 2). In the event that the signal is out of this range, a calibration block more representative of the material to be examined shall be produced/manufactured.