1、September 2008DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.160.30!$Qf;“14667
2、24www.din.deDDIN EN ISO 14744-1Welding Acceptance inspection of electron beam welding machines Part 1: Principles and acceptance conditions (ISO 14744-1:2008)English version of DIN EN ISO 14744-1:2008-09Schweien Abnahmeprfung von Elektronenstrahl-Schweimaschinen Teil 1: Grundlagen und Abnahmebedingu
3、ngen (ISO 14744-1:2008)Englische Fassung DIN EN ISO 14744-1:2008-09SupersedesDIN EN ISO 14744-1:2000-07www.beuth.deDocument comprises 15 pagesDIN EN ISO 14744-1:2008-09 2 National foreword This standard has been published in accordance with a decision taken by CEN/TC 121 “Welding” (Secretariat: DIN,
4、 Germany) to adopt, without alteration, International Standard ISO 14744-1:2008 as a European Standard. ISO 14744-1:2008 was prepared by Technical Committee ISO/TC 44 “Welding and allied processes” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenau
5、sschuss Schweitechnik (Welding Standards Committee), Technical Committee NA 092-00-15 AA Elektronenstrahlschweien (DVS AG V 9.1). The International Standards referred to in clause 2 and in the bibliography of the EN have been published as the corresponding DIN EN ISO Standards with the same number.
6、Amendments This standard differs from DIN EN ISO 14744-1:2000-07 as follows: a) The title and the content of International Standard ISO 14744-1:2008 are included in full. b) Clause 4 “Conditions for acceptance inspection” has been revised and rearranged. c) Limit deviations for machine parameters an
7、d characteristics (Table 1) have been revised. d) Annex B (informative) “Specification of a weld test of penetration deviation” has been deleted. Previous editions DIN 32505: 1980-1 DIN 32505-1: 1987-10 DIN EN ISO 14744-1: 2000-07 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14744-1 May
8、2008 ICS 25.160.30 Supersedes EN ISO 14744-1:2000 English Version Welding - Acceptance inspection of electron beam welding machines - Part 1: Principles and acceptance conditions (ISO 14744-1:2008) Soudage - Essais de rception des machines de soudage par faisceau dlectrons - Partie 1: Principes et c
9、onditions de rception (ISO 14744-1:2008) Schweien - Abnahmeprfung von Elektronenstrahl-Schweimaschinen - Teil 1: Grundlagen und Abnahmebedingungen (ISO 14744-1:2008) This European Standard was approved by CEN on 26 April 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations
10、 which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This Europe
11、an Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the nati
12、onal standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and U
13、nited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 147
14、44-1:2008: E2 DIN EN ISO 14744-1:2008-09 EN ISO 14744-1:2008 (E) Contents Page Foreword3 1 Scope 5 2 Normative references 5 3 Symbols and abbreviated terms 5 4 Conditions for acceptance inspection.6 4.1 General6 4.2 Installation of electron beam welding machine7 4.3 Power source .7 4.4 Safety precau
15、tions.7 4.5 Operating instructions 7 4.6 Instruments 7 5 Principles of acceptance inspection8 5.1 Setting range8 5.2 Limit deviations for machine parameters and characteristics .8 5.3 Test report 9 6 Acceptance inspection. 10 6.1 General. 10 6.2 Accelerating voltage, beam current, and lens current 1
16、0 6.3 Welding speed characteristics. 10 6.4 Run-out accuracy 11 6.5 Stability of spot position 11 7 Supplementary acceptance inspections 11 Annex A (informative) Procedures for inspection of pressure rise rate. 12 Bibliography. 13 Foreword 3 This document (EN ISO 14744-1:2008) has been prepared by T
17、echnical Committee ISO/TC 44 “Welding and allied processes“ in collaboration with Technical Committee CEN/TC 121 “Welding” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, a
18、t the latest by November 2008, and conflicting national standards shall be withdrawn at the latest by November 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying
19、any or all such patent rights. This document supersedes EN ISO 14744-1:2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark,
20、Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 14744-1:2008 has been approved
21、by CEN as a EN ISO 14744-1:2008 without any modification. EN ISO 14744-1:2008 (E) DIN EN ISO 14744-1:2008-09 Introduction Components, failure of which will endanger life, are subject to comprehensive test and acceptance specifications, which, among other things, require production equipment to be of
22、 proven type and in accordance with the state of the art. Similarly, in welding practice, standards apply that specify, for example, the required manual skills which a welder must have for controlling the weld. In welding processes that are not under direct manual control, such as in electron beam w
23、elding, requirements for various machine parameters are established. This standard series on acceptance inspection of electron beam welding machines is based on the concept that the production of continuously high-quality welds is ensured if, among other things, the settings, within defined limits,
24、are reproducible during the operating period. Taking this into account, this standard specifies details of the main machine parameters (accelerating voltage, beam current, lens current and welding speed characteristics) together with deviations permitted in short-term or long-term operation. It also
25、 includes requirements regarding the run-out accuracy of the devices positioning the workpiece and regarding the stability of the spot position of the electron beam. Users, manufacturers, research experts and inspection bodies are all agreed that electron beam welding machines complying with the req
26、uirements are suitable for welding components subject to acceptance inspection, such as aircraft equipment, pressure vessels, valves, etc., within specified setting ranges, assuming that other conditions (e.g. qualified staff, quality control) are fulfilled. ISO 14744 any part(s) can be referred to
27、in contracts for supply of electron beam welding machines. Further tests are not normally required if proof of satisfactory welding results is provided in the form of routine inspection documentation. However, the requirements of the standard can also be used for inspection as part of maintenance, i
28、f required by contract. 4 DIN EN ISO 14744-1:2008-09 EN ISO 14744-1:2008 (E) 1 Scope This part of ISO 14744 specifies requirements for acceptance inspection of electron beam welding machines preferably when first installed on the users premises. 2 Normative references The following referenced docume
29、nts 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. ISO 17662, Welding Calibration, verification and validation of equipment used fo
30、r welding, including ancillary activities 3 Symbols and abbreviated terms For the purposes of this part of ISO 14744, the following symbols apply: AFfocal distance, in millimetres AWwork distance, in millimetres ax; ay; azdeviation, in millimetres, of electron beam axis from weld groove centre or of
31、 beam focus from groove centre on weld surface in the x-, y- or z-direction of feed, as a measure of the run-out accuracy D diameter, in millimetres or in centimetres, of a circumference weld seam IBbeam current, in milliamperes IB maxmaximum beam current, in milliamperes, corresponding to UA maxand
32、 UA min, respectively IB minminimum beam current, in milliamperes, corresponding to UA maxand UA min, respectively ILlens current, in milliamperes IL maxlens current, in milliamperes, at UA maxand for AF minIL minlens current, in milliamperes, at UA minand for AF max5 EN ISO 14744-1:2008 (E) DIN EN
33、ISO 14744-1:2008-09 m load, in kilograms force, on the work table or on rotating fixture resulting from workpiece mass including that of any clamping device n rotational frequency, in reciprocal minutes, of rotating fixture twtime, in seconds, for welding a seam tw maxmaximum time, in seconds, for w
34、elding a seam Q pressure rise rate, in pascal cubic decimetres per second, or millibarlitres per second UAindicated accelerating voltage, in kilovolts UA maxmaximum indicated accelerating voltage, in kilovolts, within the setting range UA minminimum indicated accelerating voltage, in kilovolts, with
35、in the setting range Uamonitored voltage for measuring the accelerating voltage, in millivolts Ubmonitored voltage, in millivolts, for measuring the beam current, in millivolts Uvmonitored voltage, in millivolts, for measuring the welding speed v welding speed, in millimetres per second, in centimet
36、res per minute or in metres per minute 4 Conditions for acceptance inspection 4.1 General Acceptance inspection shall be performed after the first installation or before the first operation of the welding machine. The following tests shall be done: accelerating voltage characteristics; beam current
37、characteristics; lens current characteristics; speed characteristics of movement devices; run-out accuracy of movement devices; stability of spot position. And the following test may be agreed: pressure rise rate. After changing of equipment location the following test shall be done: speed character
38、istics of movement devices; run-out accuracy of movement devices; stability of spot position. 6 DIN EN ISO 14744-1:2008-09 EN ISO 14744-1:2008 (E) And the following test may be agreed: pressure rise rate. After rebuilding, maintenance or changing the conditions of operation the following tests shall
39、 be done: tests of all affected machine components. The acceptance inspection may be extended on parameters, characteristics and additional devices, when there are no requirements described in ISO 14744 (all parts). In these cases, requirements and limit deviations shall be agreed. However, measurem
40、ent of accelerating voltage may be performed prior to delivery of the welding machine in accordance with ISO 14744-2. 4.2 Installation of electron beam welding machine Electron beam welding machines shall be installed so that acceptance inspection and machine performance are not interfered with by v
41、ibration or by electrical or magnetic fields. 4.3 Power source The power source for electron beam welding machines shall be an electrical mains system with voltage fluctuations not exceeding 10 %. 4.4 Safety precautions This part of ISO 14744 does not cover inspection of safety devices and other saf
42、ety aspects. IMPORTANT Machines for electron beam welding have several features which assure safe operation. The electron beam generates x-rays during welding and the work chamber walls, the work chamber windows and other parts have to reduce the radiation outside the machine to low safe levels so a
43、s to permit operators and other personnel to work safely close to the machine. The parts of the machine subject to high-voltages should, of course, be protected and inaccessible when under high tension. Some of the features which assure safe operation may have to be tested after installation of the
44、machine, prior to any use of the machine in production. Any such test is, however, outside the scope of this part of ISO 14744. The tests have to be specified by the supplier of the machine. In addition, it is important to consider that the design of machines for electron beam welding, protection ag
45、ainst x-rays etc., are subject to several legal requirements at the European level (e.g. directives for: machines; electromagnetic compatibility; low-voltage equipment) and supplementary national requirements in at least some countries. See also IEC 60204-1. 4.5 Operating instructions The operating
46、instructions for the electron beam welding machine shall be complied with. 4.6 Instruments The accuracy of all instruments for measurement shall be compatible with the limit deviations specified in this part of ISO 14744, see Table 1. In accordance with ISO 17662, no calibration, no verification, an
47、d no validation of measurement equipment is necessary. 7 EN ISO 14744-1:2008 (E) DIN EN ISO 14744-1:2008-09 5 Principles of acceptance inspection 5.1 Setting range The setting range shall be specified for the machine to undergo the acceptance inspection, giving setting ranges for the following param
48、eters: accelerating voltage; beam current; lens current; welding speed in all primary welding directions. Other parameters necessary for proper control of the welding machine shall also be specified, e.g.: focal distance; load resulting from workpiece and fixture mass; pressure rise rate (if necessa
49、ry). 5.2 Limit deviations for machine parameters and characteristics The limit deviations given in Table 1 relate to the mean of the measured values concerned, unless otherwise specified. The limit deviations relate to the use of electron beam welding machines without special requirement. Alternative deviations may be agreed by contract for special machines or special applications. 8 DIN EN ISO 14744-1:2008-09 EN ISO 14744-1:2008 (E) Table 1 Limit deviations for machine parameters and characteristics Parameters and
