《ISO-14744-4-2000.pdf》由会员分享，可在线阅读，更多相关《ISO-14744-4-2000.pdf（12页珍藏版）》请在三一文库上搜索。
1、Reference number ISO 14744-4:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 14744-4 First edition 2000-04-15 Welding Acceptance inspection of electron beam welding machines Part 4: Measurement of welding speed Soudage Essais de rception des machines de soudage par faisceau dlectrons Partie 4: Mesure de
2、 la vitesse de soudage Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14744-4:2000(E) PDF disclaimer This P
3、DF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therei
4、n the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the
5、PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2000 All rights reserve
6、d. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester
7、. ISO copyright office Case postale 56?CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 734 10 79 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2000 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=
8、Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14744-4:2000(E) ISO 2000 All rights reservediii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bod
9、ies (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 organization
10、s, 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
11、ISO/IEC Directives, Part 3. 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 member bodies casting a vote. Attention is drawn to the possibility that some o
12、f the elements of this part of ISO 14744 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 14744-4 was prepared by the European Committee for Standardization (CEN) in collaboration with ISO Technical Commi
13、ttee TC 44,Welding and allied processes, Subcommittee SC 10, Unification of requirements in the field of metal welding, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). Throughout the text of this standard, read “.this European Standard.“ to mean “.th
14、is International Standard.“. ISO 14744 consists of the following parts, under the general titleWelding Acceptance inspection of electron beam welding machines: Part 1: Principles and acceptance conditions Part 2: Measurement of accelerating voltage characteristics Part 3: Measurement of beam current
15、 characteristics Part 4: Measurement of welding speed Part 5: Measurement of run-out accuracy Part 6: Measurement of stability of spot position Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:
16、00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14744-4:2000(E) iv ISO 2000 All rights reserved Contents Page Foreword .v 1Scope .1 2Normative reference .1 3Test arrangement .1 3.1Electrical test arrangement.1 3.2Mechanical test arrangement.3 4Measurement procedur
17、e 3 4.1General.3 4.2Rotation device.4 4.3Measuring the short-term stability4 4.4Measuring the long-term stability.4 4.5Measuring the reproducibility.4 5Evaluation 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for R
18、esale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14744-4:2000(E) ISO 2000 All rights reservedv Foreword The text of EN ISO 14744-3:2000 has been prepared by Technical Committee CEN/TC 121 “Welding“, the secretariat of which is held by DS, in co
19、llaboration with Technical Committee ISO/TC 44 “Welding and allied processes“. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2000, and conflicting national standards shall be withdrawn a
20、t the latest by October 2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemb
21、ourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This draft European Standard is composed of the six following parts: Part 1: Principles and acceptance conditions; Part 2: Measurement of accelerating voltage characteristics; Part 3: Measurement of beam current
22、characteristics; Part 4: Measurement of welding speed; Part 5: Measurement of run-out accuracy; Part 6: Measurement of stability of spot position. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007
23、09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without lice
24、nse from IHS -,-,- ISO 14744-4:2000(E) ISO 2000 All rights reserved1 1 Scope This standard is intended for use when the welding speed for electron beam welding machines complying with EN ISO 14744-1 is to be measured in connection with an acceptance inspection. It provides essential information on t
25、he procedure and apparatus to be used for making the measurements. Alternative standardised procedures can be used, provided they have at least the same acceptance inspection as the welds specified in this part 4. The measured parameter is the speed of the translational and rotational movements requ
26、ired to perform the welding operation. The welding speed is one of the significant parameters in electron beam welding. The workpiece or the weld point shall thus be moved at a uniform speed, in a reproducible manner, within given short-term and long-term limits. The purpose of the measurement is to
27、 check whether the variations in welding speed are maintained within these limits. 2 Normative reference This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publicati
28、ons are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendm
29、ents). EN ISO 14744-1:2000 Welding Acceptance inspection of electron beam welding machines Part 1: Principles and acceptance conditions (ISO 14744-1 : 2000) 3 Test arrangement 3.1 Electrical test arrangement To take account of all interferences affecting the welding speed, the measurement shall be m
30、ade directly on the workpiece or on the device positioning the workpiece or on a movable electron gun, if appropriate. Suitable transducers, with a linear response, may be used to transmit the translational or rotational movement, e.g. rotary transducers, via a hard rubber friction wheel (see figure
31、s 1 and 2). Build-in encoders or resolvers may also be used, if directly connected to the moving devices. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking
32、 permitted without license from IHS -,-,- ISO 14744-4:2000(E) 2 ISO 2000 All rights reserved Surface roughness in ?m Key 1 Work table 2 Contact strip 3 Rotary transducer fixed to non-moving part Figure 1 - Example of arrangement for measuring the speed of translational movements Copyright Internatio
33、nal Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14744-4:2000(E) ISO 2000 All rights reserved3 Surface roughness in ?m Key 1 Rota
34、ting device 2 Rotary transducer 3 Flexible metal angle fixed to non-moving part 4 Contact ring Figure 2 - Example of arrangement for measuring the speed of rotational movements 3.2 Mechanical test arrangement A special support has to be used to effect mechanical contact between transducer and the de
35、vice positioning the workpiece. For greater accuracy of measurement, this special support has to fulfill the following requirements: a) it shall keep the transducer firmly in place with minimum vibration, e.g. on the work table supporting structure or on the work chamber. In some cases, multiaxial s
36、upport of the transducer might be necessary; b) it shall allow for a certain yield in the contact between friction wheel and contact surface, e.g. by means of a resilient metal angle (see figure 2). Any slip occurring is at once evident in the measurement and can be compensated for by slightly incre
37、asing the pressure application. Rotary transducers may also be used for speed measurements under vacuum. Relevant information may be obtained from the manufacturer of the transducer. For such measurement, a feed-through to accommodate a multi-core cable is required for connecting the transducer and
38、the frequency-voltage converter. 4 Measurement procedure 4.1 General The measurements shall be carried out with the welding machine set as specified in 6.3 of EN ISO 14744-1:2000. Unless otherwise specified the measurements may be carried out with the chamber vented. Copyright International Organiza
39、tion for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14744-4:2000(E) 4 ISO 2000 All rights reserved 4.2 Rotation device In case of rotational mov
40、ements, measurements shall be made at the maximum and minimum revolution of the rotation device calculated as follows: max max min v = n D ? min min max v = n D ? 4.3 Measuring the short-term stability An oscilloscope shall be used to determine the maximum range (peak-to-peak value) in the instantan
41、eous valueUv of the monitored voltage,Uv. The percentage deviation shall be calculated as follows: maxmin 100 vv v - UU U ? ? whereUv max,Uv minandUvare maximum, minimum and average values observed during the period of observation. 4.4 Measuring the long-term stability The average voltage shall be r
42、ecorded continuously for a given operating period, using an instrument eliminating ripple. The percentage deviation shall be calculated as follows: maxmin 100 or100 vvvv vv -+ UUUU UU ? whichever is the largest and whereUv maxandUv minare maximum and minimum observed values andUvis the initial value
43、. 4.5 Measuring the reproducibility The positioning devices shall be switched on and the average monitored voltage shall be measured, using an instrument eliminating ripple. The positioning devices shall subsequently be switched off and on several times and the corresponding average monitored voltag
44、es shall be recorded. The reproducibility shall be calculated as follows: maxmin 100 or100 vvvv vv -+ UUUU UU ? whichever is the greater whereUv maxandUv minare maximum and minimum average values observed andUvis the initial value. Copyright International Organization for Standardization Provided by
45、 IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14744-4:2000(E) ISO 2000 All rights reserved5 5 Evaluation The measured values of short-term and long-term stability and the rep
46、roducibility limits shall be assessed by comparing them with the limit deviations specified in EN ISO 14744-1. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or netwo
47、rking permitted without license from IHS -,-,- ISO 14744-4:2000(E) ICS 25.160.30 Price based on 5 pages ISO 2000 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 09:00:20 MDTNo reproduction or networking permitted without license from IHS -,-,-