ISO-TC135-SC3_ISO_DIS_17405_(E)

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH. IN ADDITION TO THEIR UATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS. RECIPIENTS OF THIS DRAFT ARE INVITED TO , WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICHTHEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. International Organization for Standardization, 2012 DRAFT INTERNATIONAL STANDARD ISO/DIS 17405 ISO/TC 135/SC 3 Secretariat DIN Voting begins on Voting terminates on 2012-10-04 2013-03-04 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION Non-destructive testing Ultrasonic testing Technique of testing claddings produced by welding, rolling and explosion Essais non destructifs Contrle par ultrasons Technique de contrle des placages raliss par soudage, laminage ou explosion ICS 19.100 ISO/CEN PARALLEL PROCESSING This draft has been developed within the European Committee for Standardization CEN, and processed under the CEN-lead mode of collaboration as defined in the Vienna Agreement. This draft is hereby ted to the ISO member bodies and to the CEN member bodies for a parallel five-month enquiry. Should this draft be accepted, a final draft, established on the basis of comments received, will be ted to a parallel two-month approval vote in ISO and al vote in CEN. To expedite distribution, this document is circulated as received from the committee secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at publication stage. Pour acclrer la distribution, le prsent document est distribu tel quil est parvenu du secrtariat du comit. Le travail de rdaction et de composition de texte sera effectu au Secrtariat central de lISO au stade de publication. ISO/DIS 17405 Copyright noticeThis ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted under the applicable laws of the users country, neither this ISO draft nor any extract from it may be reproduced, stored in a retri system or transmitted in any or by any means, electronic, photocopying, recording or otherwise, without prior written permission being secured. Requests for permission to reproduce should be addressed to either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. 41 22 749 01 11 Fax 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Reproduction may be subject to royalty payments or a licensing agreement. Violators may be prosecuted. ii ISO 2012 All rights reservedISO/DIS 17405 ISO 2012 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references 1 3 Terms and definitions . 1 4 Ultrasonic test system 2 4.1 General . 2 4.2 Requirements regarding probes 2 4.2.1 Dual-element straight beam probes for longitudinal waves . 2 4.2.2 Dual-element angle beam probes for longitudinal waves . 2 4.2.3 Matching probes to curved surfaces . 2 4.3 Requirements regarding the test instrument . 2 4.3.1 Determination of echo heights . 2 4.3.2 Test ranges 3 4.4 Requirements regarding the testing system 3 4.4.1 Test sensitivity . 3 4.4.2 Far field resolution 3 4.5 Instrument settings . 3 4.5.1 Range setting . 3 4.5.2 Sensitivity setting 5 5 Preparation of the test object . 9 6 Test procedure . 9 6.1 General . 9 6.2 Movement of probe . 9 6.3 Checking the instrument setting . 9 6.4 Recording levels 9 7 Test report 9 Annex A inative Determination of focal area . 11 A.1 Determination of focal area 11 A.2 Choice of recording level for discontinuities oriented perpendicularly to the surface . 11 Bibliography 12 ISO/DIS 17405 iv ISO 2012 All rights reservedForeword ISO the International Organization for Standardization is a worldwide federation of national standards bodies ISO member bodies. The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission IEC on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17405 was prepared by Technical Committee ISO/TC 135, Non-destructive testing, Subcommittee SC 3, and by Technical Committee CEN/TC 138, Non-destructive testing in collaboration. DRAFT INTERNATIONAL STANDARD ISO/DIS 17405 ISO 2012 All rights reserved 1Non-destructive testing Ultrasonic testing Technique of testing claddings produced by welding, rolling and explosion 1 Scope This document specifies the techniques for manual ultrasonic testing of claddings on steel applied by welding, rolling and explosion. The test is intended to cover detection of two-dimensional or three-dimensional discontinuities in the cladding and in the region of the interface. This standard does not give acceptance criteria nor define the extent of testing. 2 Normative references The following referenced documents are indispensable for the application 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. EN 1330-4, Non-destructive testing Terminology Part 4 Terms used in ultrasonic testing EN 12668-1, Non-destructive testing Characterization and verification of ultrasonic examination equipment Part 1 Instruments EN 12668-2, Non-destructive testing Characterization and verification of ultrasonic examination equipment Part 2 Probes EN 12668-3, Non-destructive testing Characterization and verification of ultrasonic examination equipment Part 3 Combined equipment prEN ISO 2400, Non-destructive testing Ultrasonic testing Specification for calibration block No. 1 ISO/DIS 24002011 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1330-4 and the following apply. 3.1 test object part to be tested 3.2 test surface areas of the surface of the test object to which probes have to be coupled ISO/DIS 17405 2 ISO 2012 All rights reserved4 Ultrasonic test system 4.1 General The ultrasonic pulse-echo technique is used. For two-dimensional discontinuities parallel to the test surface and for three-dimensional discontinuities straight beam probes shall be used for testing with longitudinal waves using dual-element or single element probes. For discontinuities with any other orientation, dual-element angle beam probes for longitudinal waves may be used . The nominal frequency shall be selected according to the purpose of the test. Frequencies from 2 MHz to 6 MHz should be preferred. The instrument used shall comply with the requirements given in EN 12668-1, and the probes shall comply with the requirements of EN 12668-2 The whole test system shall be checked by the operator periodically as given in EN 12668-3. 4.2 Requirements regarding probes 4.2.1 Dual-element straight beam probes for longitudinal waves A zone of a depth providing optimum sensitivity is defined see Annex A by the size of the transducers used in the probes and their roof angle. The position of this zone should be selected according to the expected position of the discontinuities preferably according to the thickness of the cladding. 4.2.2 Dual-element angle beam probes for longitudinal waves The beam angle should be between 65 and 73. The skewing angle, and the shape and size of the transducers shall be selected so that the range of depth for optimum sensitivity see Annex A covers the expected position of the discontinuity; generally this will be the thickness of the cladding. 4.2.3 Matching probes to curved surfaces The distance between the surface and the front face of the probe shall not exceed 0,5 mm when the centre of the probe is in contact. To achieve this, the probe shall be matched to the curvature of the test object by grinding, using adaptors or other aids if the radius of curvature, R, is within the range 42PAR 1 Where R is the radius of the curvature of the surface, in mm; APis the dimension of the front face of the probe in the direction of curvature, in mm, i. e. for testing cylindrical parts in the longitudinal direction, it is the width, and for testing in the circumferential direction, it is the length of the front face. 4.3 Requirements regarding the test instrument 4.3.1 Determination of echo heights ISO/DIS 17405 ISO 2012 All rights reserved 3The instruments amplifier shall not exhibit any saturation in the range of sensitivity used for testing. If necessary, this should be checked by the operator before test. 4.3.2 Test ranges The test ranges that can be selected on the test instrument shall run without a gap and shall be set continuously. Within each test range the display shall be linear to within 2 of the test range. There shall be a facility for an expanded representation of a particular time range on the complete width of the screen “expanded sweep“; this facility shall permit a minimum sound path range of 10 mm to be shown linear to within 2 of full screen width. 4.4 Requirements regarding the testing system 4.4.1 Test sensitivity The usable sensitivity of the test system shall be greater than the recording level. This shall, if necessary, be verified by the operator by determining the actual amplification reserve see also 4.3.2. 4.4.2 Far field resolution The pulse width visible on the screen shall be within 4 mm to 8 mm steel path for longitudinal waves when using dual-element straight beam probes, resp. or 6 mm to 10 mm steel path for longitudinal waves when using dual-element angle beam probes. 4.5 Instrument settings 4.5.1 Range setting Range setting of the ultrasonic instrument for accurate localisation of discontinuities when using dual-element probes can be carried out using reference blocks for definition of term EN 1330-2 as shown in Figure 1 or Figure 2 for example, made of materials that are similar to the test object, or it can be carried out on the test object itself. In the case of a dual-element straight beam probe, the probe can, for example, be placed on the various steps of a stepped wedge calibration block. The front edge of the associated echo shall be set on the appropriate marks on the screen by adjusting the zero shift and the sweep velocity. When dual-element angle beam probes are used on a reference block, as shown in Figure 2 for example, the shortened projected distances distance between the front edge of the probe and the projection of the reflection point on the test surface shall be lined up with the appropriate marks on the screen. In this manner, it is possible to read the position of a reflection point directly on the screen, i. e. for the setting with shortened projected distances as well as with depth positions. NOTE 1 It is recommended to mark the range of any discontinuities to be detected to on the screen according to their depth position normally corresponding to the thickness of the cladding. When straight beam probes are used, the range of the ultrasonic instrument can be calibrated using multiple echo series from a plane-parallel steel plate of known thickness and sound velocity e. g. calibration block No 1 according to EN ISO 2400. NOTE 2 Since when dual-element angle beam probes are used for longitudinal waves, transverse waves are also generated, care shall be taken to ensure that no erroneous indications of transverse waves are used during the setting procedure; In any case these indications .have a considerable larger time-of-flight than shown in figure 2. ISO/DIS 17405 4 ISO 2012 All rights reservedDimensions in millimetre Key X Reflector depth Y Echo height 1 Probe 2 Focal range 3 FA Focal depth When reference blocks are used, all dimensions not specified should be selected so the measurement or setting is not impaired by echoes from the geometry of the test block. Figure 1 Reference block for dual-element straight-beam probes with representation of the focal range ISO/DIS 17405 ISO 2012 All rights reserved 5Dimensions in millimetre Key X Reflector depth Y Echo height 1 Focal range 2 FA Focal depth When reference blocks are used, all unspecified dimensions should be selected so that the placing of the probe on the test surface and the measurement or adjustment are not affected by shape echoes. Figure 2 Reference block for dual-element angle beam probes showing the focal range 4.5.2 Sensitivity setting Adjustment reference block as shown in Figure 3 with a cladding of the same type as that to be tested shall be used for setting the sensitivity. The thickness of the cladding and the surface preparation and the shape of the test surface shall be the same as those of the object to be tested see Clause 5. If the probes have to be matched to curved test surfaces, the reference blocks used shall also have test surfaces whose radius of curvature differs by no more than 10 from that of the surface of the test object. Side-drilled holes of 3 mm diameter and 30 mm long in the parent metal at the interface with the cladding shall be used as reference reflectors, see Figure 3. In the case of claddings produced by welding, one hole shall be ISO/DIS 17405 6 ISO 2012 All rights reservedmade perpendicular to the direction of welding and one parallel to this direction. In the case of double or multi-pass welded claddings, it may be necessary to use further holes between the individual passes. Positions 1, 2 and 3 in Figure 3 show how the reference reflector echo shall be generated for setting the test sensitivity of the instrument. It is recommended that the echo height should be set to 40 of the screen height. When straight beam probes are used, only reference blocks of t