DIN EN 13100-4-2013 Non destructive testing of welded joints of thermoplastics semifinished products Part 4 High voltage testing German version EN 13100-4 2012《热塑性半成品焊接接头的无损检测 第4部分.pdf

《DIN EN 13100-4-2013 Non destructive testing of welded joints of thermoplastics semifinished products Part 4 High voltage testing German version EN 13100-4 2012《热塑性半成品焊接接头的无损检测 第4部分.pdf》由会员分享，可在线阅读，更多相关《DIN EN 13100-4-2013 Non destructive testing of welded joints of thermoplastics semifinished products Part 4 High voltage testing German version EN 13100-4 2012《热塑性半成品焊接接头的无损检测 第4部分.pdf（12页珍藏版）》请在麦多课文档分享上搜索。

1、January 2013 Translation by DIN-Sprachendienst.English price group 8No part of this translation 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

2、 25.160.40!$jP“1937145www.din.deDDIN EN 13100-4Non destructive testing of welded joints of thermoplastics semifinishedproducts Part 4: High voltage testing;English version EN 13100-4:2012,English translation of DIN EN 13100-4:2013-01Zerstrungsfreie Prfung von Schweiverbindungen thermoplastischer Kun

3、ststoffe Teil 4: Hochspannungsprfung;Englische Fassung EN 13100-4:2012,Englische bersetzung von DIN EN 13100-4:2013-01Essais non destructifs des assemblages souds sur produits semi-finis enthermoplastiques Partie 4: Essais haute tension;Version anglaise EN 13100-4:2012,Traduction anglaise de DIN EN

4、13100-4:2013-01www.beuth.deDocument comprises 12 pagesIn case of doubt, the German-language original shall be considered authoritative.01.13DIN EN 13100-4:2013-01 2 A comma is used as the decimal marker. National foreword This document (EN 13100-4:2012) has been prepared by Technical Committee CEN/T

5、C 249 “Plastics” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Working Committee NA 054-05-12 AA Fgen von Kunststoffen. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13100-4 October 2012

6、 ICS 25.160.40 English Version Non destructive testing of welded joints of thermoplastics semifinished products - Part 4: High voltage testing Essais non destructifs des assemblages souds sur produits semi-finis en thermoplastiques - Partie 4 : Essais haute tension Zerstrungsfreie Prfung von Schweiv

7、erbindungen thermoplastischer Kunststoffe - Teil 4: Hochspannungsprfung This European Standard was approved by CEN on 22 September 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national

8、 standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version

9、 in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czec

10、h Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EU

11、ROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13100-4:2012: EEN 13100-4:

12、2012 (E) 2 Contents Page Foreword . 31 Scope . 42 Terms and definitions . 43 Symbols and designations 44 Principle of the test . 45 Equipment types . 55.1 General . 55.2 High frequency spark tester 55.3 DC Holiday detector 55.4 Pulsed Holiday detector . 66 Determination of test voltage 66.1 General

13、. 66.2 Butt joints 66.3 Overlap joints 77 Test electrode 88 Test procedure 88.1 DC and pulsed holiday detectors 88.2 High frequency spark testers 99 Test report . 9DIN EN 13100-4:2013-01 EN 13100-4:2012 (E) 3 Foreword This document (EN 13100-4:2012) has been prepared by Technical Committee CEN/TC 24

14、9 “Platics”, the secretariat of which is held by NBN. 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 April 2013, and conflicting national standards shall be withdrawn at the latest by April 2013.

15、 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 any or all such patent rights. This document is composed of the following parts: EN 13100-1, Non destructive testing

16、 of welded joints of thermoplastics semi-finished products Part 1: Visual examination; EN 13100-2, Non-destructive testing of welded joints in thermoplastics semi-finished products Part 2: X-ray radiographic testing; EN 13100-3, Non destructive testing of welded joints in thermoplastics semi-finishe

17、d products Part 3: Ultrasonic testing; EN 13100-4, Non destructive testing of welded joints of thermoplastics semifinished products Part 4: High voltage testing. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement

18、this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slov

19、akia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 13100-4:2013-01 EN 13100-4:2012 (E) 4 1 Scope This European Standard specifies the equipment and methods for the high voltage testing of butt or overlap welded joints in thermoplastic sheets for locating through-thickn

20、ess defects only. It applies to new unused constructions only. 2 Terms and definitions For the purpose of this document, the following terms and definitions apply. 2.1 dielectric strength maximum voltage a material of unit thickness can withstand continuously without failure 3 Symbols and designatio

21、ns Symbols and designations are given in Table 1. Table 1 Symbols and designations Symbol Designation Unit DsDielectric strength Vmm-1VBBreakdown voltage V dtDistance from test electrode to conductor mm VIInitial test voltage V VAActual voltage used for the test V VoVoltage which causes a spark at a

22、 hole in the plastic sheet V 4 Principle of the test A high voltage is applied to one side of the joint to be tested using a suitable electrode, the other side of the material needs to be in contact with a conductive substrate which in some cases will need a connection back to the test equipment. Th

23、e test shall be carried out with a voltage high enough to jump the gap between the test electrode and a conductor. A defect is indicated by a spark discharge and, depending on the equipment used, a simultaneous optical and / or acoustic signal. The health and safety aspects (e.g. electric shocks, ri

24、sks of explosions in flammable atmosphere) together with the environmental impacts (e.g. electromagnetic disturbances) shall be thoroughly considered before operating the equipment. NOTE Moisture in concrete can make it sufficiently conductive to allow high voltage testing to be used. DIN EN 13100-4

25、:2013-01 EN 13100-4:2012 (E) 5 5 Equipment types 5.1 General There are three types of high voltage tester available. The most appropriate type to be used will depend on the type of tests to be carried out and customer requirements. 5.2 High frequency spark tester 5.2.1 Principle This equipment gener

26、ates a high frequency AC voltage of up to 100 kV. It is normally mains powered. The output is low power and normally un-stabilised. The output voltage is adjusted by spark length. Defects are normally indicated by visual spark only. 5.2.2 Advantages No connection to the substrate required as long as

27、 it is metal and has an area 1 000 times larger than the test electrode. Higher output voltages, allowing thicker material or longer overlap joints to be tested. 5.2.3 Limitations No output voltage meter. Fault identified by visual spark only. AC mains powered. 5.3 DC Holiday detector 5.3.1 Principl

28、e This equipment generates a DC high voltage of up to 50 kV. It can be mains or battery powered. The output is low power and normally stabilised. The output voltage is indicated on a meter either in the unit or external to it. Defects are indicated by the activation of an optical and/or acoustic sig

29、nal as well as a visual spark. 5.3.2 Advantages The test voltage can be set accurately. Can be used on concrete substrates. 5.3.3 Limitations Connection to substrate required. Can be affected by moisture on the surface of the thermoplastic sheet. DIN EN 13100-4:2013-01 EN 13100-4:2012 (E) 6 5.4 Puls

30、ed Holiday detector 5.4.1 Principle This equipment generates a pulsed DC high voltage of up to 50 kV. The pulse rate can be from 30 to 10 000 pulses per second depending on the manufacturer. Pulsed units tend to have higher power output than spark testers or DC holiday detectors. The output voltage

31、can be verified using a crest reading voltmeter. Imperfections are indicated by the activation of an optical and/or acoustic signal as well as a visual spark. 5.4.2 Advantages Can work in the presence of a small amount of moisture on the surface. 5.4.3 Limitations Connection to substrate required. O

32、utput voltage harder to verify (special meter required). Lower speed of testing dependent on pulse rate. 6 Determination of test voltage 6.1 General This section is for testers that can be set to a known voltage. 6.2 Butt joints 6.2.1 Test arrangement For butt joints in thermoplastic sheets with a t

33、hickness in the range 1 mm to 30 mm (see Figure 1), the initial test voltage, VI, is given by: VI= 250 (1000 dt) (1) Providing the test electrode is in contact with the upper surface of the sheet and the conductive substrate is in contact with the lower surface of the sheet, dtis equal to the sheet

34、thickness. DIN EN 13100-4:2013-01 EN 13100-4:2012 (E) 7 Key a substrate b plastic sheet c weld d electrode Figure 1 Butt joint However, depending on the dielectric strength of the sheet, VIcan damage the material. The breakdown voltage, VB, is given by: VB= Dsdt(2) The value of the breakdown voltage

35、, VB, for each sheet shall be calculated from Formula (2) using the value of Dsprovided by the sheet manufacturer. If VIVB, then experimental trials, as described in 6.2.2, shall be carried out to determine VA. If the dielectric strength is not known, the output voltage of the tester shall be set to

36、 1.3 VI. The test electrode shall then be placed on an unwelded test piece of the same material in which the welds are to be examined and the voltage shall be applied for a duration of 1 min. If no fault is made in the sheet then VAshall be equal to VI. If the material fails then further experimenta

37、l trials, as described in 6.2.2, shall be carried out to determine VA. 6.2.2 Determination of VAif VI VBA 1 mm diameter perpendicular hole shall be made in an unwelded test piece of the same material in which the welds are to be examined, using a clean drill. The minimum distance from the hole to th

38、e edge of the test piece shall be five times the sheet thickness. With the electrode over the hole, the voltage shall be increased until a spark jumps the gap. This voltage, Vo, shall be noted. Further holes shall be made in the test piece at an angle of 45. The minimum distance between holes and al

39、so between any hole and the edge of the test piece shall again be five times the sheet thickness. The test voltage shall then be increased to (VB+Vo)/2 and, if all of the holes are detected, this shall be used as VA. If any of the holes are not detected, the test voltage shall be increased by 10 % a

40、nd the tests shall be repeated using new holes. Test holes shall only be used once. 6.3 Overlap joints In overlap joints the distance from the test electrode to the substrate, dt, can be many times the thickness of the material and the test voltage required could therefore cause the material to brea

41、k down. To minimise the test voltage required, a thin un-insulated wire should be placed as close as possible to the inside of the weld. See Figure 2. DIN EN 13100-4:2013-01 EN 13100-4:2012 (E) 8 Key a electrode b plastic sheet c weld d wire Figure 2 Overlap joint If the required test voltage is hig

42、her than the dielectric strength for the given thickness, check that the material can withstand the higher test voltage, place the test electrode on a sample piece of the material, not a weld and apply the test voltage for 1 min. If no fault is made in the sample then the test voltage is usable. If

43、the material fails then the maximum distance from the test electrode to the wire must be reduced either by reducing the width of the weld or by changing the material used, and the test voltage recalculated. 7 Test electrode The test electrode shall be constructed in such a way that it makes contact

44、with the sheet surface without gapping or missing any of the area to be tested. For recessed or protruding areas, a small (i.e. with a contact area 1 cm2) brush electrode should be used. For overlap joints, a small brush or pointed electrode should be used. The test electrodes shall be kept in such

45、a mechanical condition as to maintain contact with the sheet surface at all times during the examination. 8 Test procedure 8.1 DC and pulsed holiday detectors The surface to be tested shall be clean and dry. The test electrode shall be connected to the high voltage tester in accordance with the manu

46、facturers instructions. The high voltage return lead from the detector shall be connected to the substrate or wire and a separate electrical connection shall be made between the substrate and a true earth. The output voltage of the detector shall be adjusted to the required level, VA. To check that

47、the detector is working, the test electrode shall be placed on the substrate; a spark should be seen and the audio / visual alarm should operate. The test electrode shall be moved without stopping along the weld and in contact with it, at a speed of 40 cm/s maximum, or slower if indicated by the det

48、ector manufacturer. The location of faults shall be visibly marked as they are detected. DIN EN 13100-4:2013-01 EN 13100-4:2012 (E) 9 All faults detected shall be repaired and the area retested. 8.2 High frequency spark testers The surface to be tested shall be clean and dry. The test electrode shal

49、l be connected to the spark tester in accordance with the manufacturers instructions. If possible, a separate electrical connection should be made between the substrate or wire and a true earth, since this will give a brighter spark. With the test electrode on the surface, the output of the spark tester shall be adjusted to give a spark length 3 mm longer than the maximum distance expected when testing between the electrode and substrate