1、BRITISH STANDARD Welding - Acceptance inspection of electron beam welding machines - Part 4: Measurement of welding speed The European Standard EN IS0 14744-4:2000 has the status of a British Standard ICs 25.160.30 IS EN IS0 47AA-A:2001 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMIITED BY COPYRI
2、GHT LAW National foreword direction of the Engineering Amd.No. Sector Committee, was published under the authority of the Standards Committee and comes into effect on 16 April 2001 This British Standard is the official English language version of EN IS0 1474442000. It is identical with IS0 147444200
3、0. The UK participation in its preparation was entrusted to Technical Committee WEW47, Miscellaneous welding standards, which has the responsibiity to: Date Comments - aid enquirers to understand the text; - present to the responsible international/European committee any enquiries on the interpretat
4、ion, or proposals for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact
5、 that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue unde
6、r the section entitled “International Standards Correspondence Index“, or by using the “Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct app
7、lication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this do
8、cument indicates when the document was last issued. O BSI 04-2001 I I ISBN O 580 34193 3 - STD-BSI BS EN IS0 L4744-4-ENGL 2001 I1624669 0902877 T2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 14744-4 April 2000 ICs 25.1 60.00 English version Welding - Acceptance inspection of electron be
9、am welding machines - Part 4: Measurement of welding speed (IS0 14744- 4:2000) Soudage - Essais de rception des machines de soudage par faisceau dlectrons - Partie 4: Mesure de la vitesse de soudage (IS0 14744-4:2000) Schweien - Abnahmeprfung von Elektronenstrahl- Schweimaschinen - Teil 4: Messen de
10、r Schweigeschwindigkeit (IS0 14744-4:2000) This European Standard was approved by CEN on 3 January 2000. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
11、 Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
12、under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
13、Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMITE EUROPEEN DE NORMALISATION Central Secretariat: rue de Stassart, 36 8-1050 Brussels 8 2000 CEN All rights of exploitation in any form a
14、nd by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 14744-4:2000 E STD-BSI BS EN IS0 L4744-4-ENGL 2001 W 1624667 0702876 927 II Page 2 EN IS0 14744-412000 Contents Page Foreword . 3 1 Scope 4 2 Normative references . 4 3 Testarrangement 4 3.1 Electrical test arrangement 4 3.
15、2 Mechanical test arrangement 5 4 Measurement procedure 5 4.1 General . 5 4.2 Rotation device 5 4.3 Measuring the short-term stability . 6 4.4 Measuring the long-term stability . 6 4.5 Measuring the reproducibility 6 5 Evaluation . 6 STDOBSI BS EN IS0 L4744-4-ENGL 2001 Lb24bb9 0902879 865 W Page 3 E
16、N IS0 14744-4:2000 Foreword The text of EN IS0 14744-3:2000 has been prepared by Technical Committee CEN/TC 121 “Welding“, the secretariat of which is held by DS, in collaboration with Technical Committee ISO/TC 44 “Welding and allied processes“. This European Standard shall be given the status of a
17、 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 at the latest by October 2000. According to the CEWCENELEC Internal Regulations, the national standards organizations of the followin
18、g countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This draft European Standard is composed of t
19、he six following parts: - Part 1 : Principles and acceptance conditions; - Part 2: Measurement of accelerating voltage characteristics; - Part 3: Measurement of beam current characteristics; - Part 4: Measurement of welding speed; - Pari 5: Measurement of run-out accuracy; - Part 6: Measurement of s
20、tability of spot position. 1 Scope This standard is intended for use when the welding speed for electron beam welding machines complying with EN IS0 14744-1 is to be measured in connection with an acceptance inspection. It provides essential information on the procedure and apparatus to be used for
21、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 required to perform the welding operation. The
22、 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 check whether the variations in welding s
23、peed are maintained within these limits. 2 Normative references 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 publications are listed hereafter. For dated refer
24、ences, 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 amendments). EN IS0 14744-1 12000 Welding - Acc
25、eptance inspection of electron beam welding machines - Part 1: Principles and a c c e p t a n ce conditions (IS0 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 made directly on the workpiec
26、e 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 figures 1 and 2). Build-in encoder
27、s or resolvers may also be used, if directly connected to the moving devices. Surface roughness in pm. Ke 1 Jork table 2 Contact strip 3 Rotary transducer fixed to non-moving pari Figure 1 - Example of arrangement for measuring the speed of translational movements Page 5 STD-BSI BS EN IS0 14744-4-EN
28、GL 2OOL M 1624bb9 0902881, 413 R EN IS0 14744-4:2000 Surface roughness in Fm ?dotatin device 2 Rotary Yransducer 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
29、support has to be used to effect mechanical contact between transducer and the device 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 wo
30、rk table supporting structure or on the work chamber. In some cases, multiaxial support 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 i
31、s at once evident in the measurement and can be compensated for by slightly increasing 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
32、 to accommodate a multi-core cable is required for connecting the transducer and 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 Unless otherwise specified the measurements may be carried o
33、ut with the chamber vented. EN IS0 14744-1 12000. 4.2 Rotation device In case of rotational movements, measurements shall be made at the maximum and minimum revolution of the rotation device calculated as follows: STD-BSI BS EN IS0 14744-4-ENGL 2001 m Lb24669 0902882 35T m Paae 6 EN-IS0 14744-4:2000
34、 4.3 Measuring the short-term stability An oscilloscope shall be used to determine the maximum range (peak-to-peak value) in the instantaneous value U; of the monitored voltage, U,. The percentage deviation shall be calculated as follows: where U; mBy, U; min and U, are maximum, minimum and average
35、values observed during the period of observation. 4.4 Measuring the long-term stability The average voltage shall be recorded continuously for a given operating period, using an instrument eliminating ripple. The percentage deviation shall be calculated as follows: whichever is the largest and where
36、 U, max and U, min are maximum and minimum observed values and UV is the initial value. 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 subsequent
37、ly be switched off and on several times and the corresponding average monitored voltages shall be recorded. The reproducibility shall be calculated as follows: whichever is the greater where U, mBy and U, min are maximum and minimum average values observed and U, is the initial value. 5 Evaluation T
38、he measured values of short-term and long-term stability and the reproducibility limits shall be assessed by comparing them with the limit deviations specified in EN IS0 14744-1. BS EN IS0 14744-4:2001 BSI 389 Chiswick High Road London w4 4AL W Lb24bb 0902683 296 = BSI - British Standards Institutio
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