《BS-EN-50078-1994.pdf》由会员分享,可在线阅读,更多相关《BS-EN-50078-1994.pdf(22页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 50078:1994 Torches and guns for arc welding The European Standard EN 50078:1993 has the status of a British Standard UDC 621.791.75.03:620-1:614.8 BS EN 50078:1994 This British Standard, having been prepared under the direction of the Welding Standards Policy Committee, was pu
2、blished under the authority of the Standards Board and comes into effect on 15 April 1994 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference WEE/6 Draft for comment 89 78623 DC ISBN 0 580 23072 4 Cooperating organizations The European Committee for Elec
3、trotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: AustriaItaly BelgiumLuxembourg DenmarkNetherlands FinlandNorway FrancePortugal GermanySpain GreeceSweden IcelandSwitzerland IrelandUnited
4、 Kingdom Amendments issued since publication Amd. No.DateComments BS EN 50078:1994 BSI 03-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 500785 National annex NA (informative) Committees responsibleInside back cover National annex NB (informa
5、tive) Cross-referencesInside back cover BS EN 50078:1994 ii BSI 03-1999 National foreword This British Standard has been prepared under the direction of the Welding Standards Policy Committee and is the English language version of EN 50078:1993 Torches and guns for arc welding published by the Europ
6、ean Committee for Electrotechnical Standardization (CENELEC). EN 50078 was produced as a result of international discussion in which the UK took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for t
7、heir correct application. 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, pages i and ii, the EN title page, pages 2 to 16, an inside back cover and a back cover. This standar
8、d has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50078 December 1993 UDC 621.791.75.03:620-1:614.8 Descriptors: Arc welding, torches, require
9、ments, tests English version Torches and guns for arc welding Torches pour le soudage larcBrenner zum Lichtbogenschweien This European Standard was approved by CENELEC on 1993-12-08. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi
10、ng 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 Central Secretariat or to any CENELEC member. This European Standard exists in three official v
11、ersions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees
12、 of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisc
13、hes Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN 50078:1993 E EN 50078:1993 BSI 03-1999 2 Foreword This European Standard was prepared by CENELEC Technical Committee TC 26A, Electric arc welding.
14、It was submitted to the CENELEC members for formal vote in September 1992 and was approved by CENELEC as EN 50078:1993 on 8 December 1993. The following dates were fixed: For products which have complied with the relevant national standard before 1994-06-01, as shown by the manufacturer or by a cert
15、ification body, this previous standard may continue to apply for production until 1999-06-01. Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, Annex A and Annex C are informative and Annex B is nor
16、mative. Contents Page Foreword2 Section 1. General 5 1Scope5 2Normative references5 3Environmental conditions5 4Definitions5 4.1torch; gun5 4.2body5 4.3handle5 4.4nozzle5 4.5non-consumable electrode (TIG, plasma)5 4.6electrode wire (MIG, MAG, MOG)5 4.7contact tip (MIG, MAG, MOG)5 4.8cable-hose assem
17、bly5 4.9MIG/MAG torch5 4.10MOG torch5 4.11TIG torch6 4.12plasma torch6 4.13plasma welding torch6 4.14manual torch6 4.15mechanically guided torch6 4.16air cooled torch6 4.17liquid cooled torch6 4.18motorized torch6 4.19spool-on-torch6 5Classification6 5.1Process6 5.2Method of guidance6 5.3Voltage cla
18、ss6 5.4Type of cooling6 Section 2. Requirements and tests7 6Test conditions7 7Protection against electric shock7 7.1Insulation resistance7 7.2Dielectric strength7 7.3Protection against direct contact7 7.3.1 Class M torches8 8Thermal rating8 8.1Temperature rise8 8.2Heating test8 8.2.1 MIG/MAG and MOG
19、 torch8 8.2.2 TIG and plasma welding torch10 8.3Duration of the heating test10 latest date of publication of an identical national standard(dop) 1994-06-01 latest date of withdrawal of conflicting national standards(dow) 1994-06-01 EN 50078:1993 BSI 03-19993 Page 8.4Determination of the ambient air
20、temperature11 8.5Cooling liquid11 8.6Resistance to weld spatter11 9Impact resistance11 10Marking11 11Instructions for use11 Annex A (informative) Additional terminology13 Annex B (normative) Position of the welding torches for the heating test15 Annex C (informative) Cooled copper block16 Figure 1 D
21、evice for testing the resistance to weld spatter12 Figure 2 Device for the impact test12 Figure A.1 MIG/MAG/MOG torch14 Figure A.2 MIG/MAG/MOG gun14 Figure A.3 TIG gun14 Figure A.4 Plasma torch14 Figure A.5 Supply unit14 Figure B.1 MIG/MAG and MOG torches15 Figure B.2 TIG torches15 Figure B.3 Plasma
22、 welding torches15 Figure C.1 Example for a water-cooled copper block16 Table 1 Dielectric test voltages7 Table 2 Degree of protection for manual torches7 Table 3 Degree of protection for mechanically guided torches8 Table 4 Test values for MIG welding of aluminium alloys9 Table 5 Test values for MA
23、G welding of mild steel9 Table 6 Test values for MAG welding with flux cored wire9 Table 7 Test values for MOG welding of mild steel10 Table 8 Test values for TIG welding10 Table 9 Test values for plasma welding10 4 blank EN 50078:1993 BSI 03-19995 Section 1. General 1 Scope This standard is applica
24、ble to torches and guns for MIG/MAG, MOG, TIG and plasma welding. This standard is not applicable to electrode holders for manual metal arc welding and to torches for plasma cutting or submerged arc welding. This standard is not applicable to unprotected torches used in automatic equipment, where pr
25、otection against direct contact is provided by other means. This standard specifies safety and construction requirements. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropri
26、ate places in the text and the publications 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 publicati
27、on referred to applies. EN 60529:1989, Degrees of protection provided by enclosures (IP Code) (IEC 529:1989). prEN 758, Classification of tubular cored electrodes for metal arc welding with or without gas shield of non alloy and fine grain steel. 3 Environmental conditions 4 Definitions For the purp
28、ose of this standard, the following definitions apply. NOTEAdditional terminology is given in Annex A. 4.1 torch; gun a unit that conveys all services necessary to the arc for welding, cutting or allied processes (e.g. current, gas, coolant, electrode wire) NOTE 1In the case of a torch the handle is
29、 co-axial with the body and the neck may be straight or curved. In the case of a gun the handle is substantially perpendicular to the body. NOTE 2In this standard the terms “torch” and “gun” are, for most purposes, interchangeable. For convenience “torch” has been used in the following text. 4.2 bod
30、y the main component to which other components and the cable-hose assembly are connected 4.3 handle the part designed to be held in the operators hand 4.4 nozzle a hollow component, fixed at the front end of the torch for directing the shielding gas around the arc and over the weld pool 4.5 non-cons
31、umable electrode (TIG, plasma) a metal electrode which does not provide filler metal 4.6 electrode wire (MIG, MAG, MOG) consumable solid or flux cored wire that passes through the contact tip. The arc is formed between the electrode and the workpiece 4.7 contact tip (MIG, MAG, MOG) a replaceable met
32、al component fixed at the front end of the torch, through which the electrode wire passes and which conducts the welding current to the electrode wire 4.8 cable-hose assembly a flexible assembly of cables and hoses and their connecting elements, that delivers all necessary supplies for operation of
33、the torch 4.9 MIG/MAG torch a torch using an electrode wire. The arc and the weld pool are shielded by an inert (MIG) or active (MAG) gas NOTEMIG and MAG are abbreviations for “metal inert gas” and “metal active gas” respectively. 4.10 MOG torch a torch using a flux cored wire. The weld pool is shie
34、lded by the slag of the molten core. The arc is shielded by gas produced during melting of the core NOTEMOG is an abbreviation for “Metall ohne Gas” (metal without gas). a) Range of the temperature of the ambient air: during welding:p 10 C to + 40 C during transport and storage:p 25 C to + 55 C. b)
35、Relative humidity of the air:up to 90 % at 20 C. EN 50078:1993 6 BSI 03-1999 4.11 TIG torch a torch using a non-consumable electrode. The weld pool and the non-consumable electrode are shielded by an inert gas NOTETIG is an abbreviation for “tungsten inert gas”. 4.12 plasma torch a torch using a non
36、-consumable electrode and having a plasma tip producing a constricted plasma arc 4.13 plasma welding torch a plasma torch for welding 4.14 manual torch a torch held in the operators hand and guided manually 4.15 mechanically guided torch a torch held and guided mechanically 4.16 air cooled torch a t
37、orch cooled by the ambient air and, where appropriate, by the shielding gas 4.17 liquid cooled torch a torch cooled by a liquid 4.18 motorized torch a MIG/MAG torch incorporating a wire drive system (push/pull) 4.19 spool-on-torch a motorized torch incorporating a spool for the electrode wire 5 Clas
38、sification Torches shall be classified according to: a) the process for which they are designed (see 5.1); b) the method by which they are guided (see 5.2); c) the voltage class (see 5.3); d) the type of cooling (see 5.4); e) accessory equipment, e.g. integrated wire drive systems and reel for the e
39、lectrode wire. 5.1 Process Torches can be designed for: a) MIG/MAG welding; b) MOG welding; c) TIG welding; d) plasma welding. 5.2 Method of guidance Torches can be guided: a) manually or b) mechanically. 5.3 Voltage class The voltage classes are characterized by: a) the maximum rated voltage with t
40、he letters: L (up to 113 V peak) or M (113 V peak up to 400 V peak) and b) the rated striking and stabilizing voltage. 5.4 Type of cooling Torches can be cooled by: a) air or cooling gas (see 4.16) or b) liquid (see 4.17). EN 50078:1993 BSI 03-19997 Section 2. Requirements and tests 6 Test condition
41、s All tests are type tests. They shall be carried out on the same initially new and completely assembled torches, fitted with their cable-hose assemblies. The heating test according to 8.2 shall be carried out at an ambient air temperature between 10 C and 40 C. The accuracy of measuring instruments
42、 shall be: The tests may be carried out in any convenient sequence except that the temperature rise test shall be followed immediately by the dielectric strength tests. 7 Protection against electric shock 7.1 Insulation resistance The insulation resistance of a new torch shall, after the humidity tr
43、eatment, be not less than the following values: Compliance shall be checked by the following test: a) Humidity treatment A humidity cabinet is maintained at a temperature t between 20 C and 30 C and a relative humidity between 91 % and 95 %. The torch fitted with the cable-hose assembly (liquid-cool
44、ed torches without cooling liquid) is brought to a temperature between t and t + 4 C and is then placed for 48 h in the humidity cabinet. b) Insulation resistance measurement Immediately after the humidity treatment, the torch and the cable-hose assembly are wiped clean and tightly wrapped in a meta
45、l foil covering the external surface of the insulation. The insulation resistance is measured by application of a d.c. voltage of 500 V between the live part connections and the metal foil and exposed conductive parts and the control switch and adjustment control connections and the connections of t
46、he other live parts, the reading being made after stabilization of the measurement. 7.2 Dielectric strength The insulation shall withstand the test voltages of Table 1 and a high frequency test voltage if applicable without flashover or breakdown, as manifested by a decrease in the applied voltage.
47、Any discharges unaccompanied by a voltage drop are disregarded. Table 1 Dielectric test voltages The test voltage shall be of an appropriate sine wave form with the peak value not exceeding 1,45 times the r.m.s. value, having a frequency of 50 Hz or 60 Hz. The high frequency test voltage shall have
48、a pulse width of 0,2 s to 8 s, a repetition frequency of 50 Hz to 300 Hz and shall be 20 % higher than the rated arc striking and stabilizing voltage. Compliance shall be checked by the following test: For the test, the torches from the preceding temperature rise test are used, after ensuring that t
49、hey are still functioning and have reverted to approximately ambient air temperature. Insulated handles are tightly wrapped with metal foil. Liquid-cooled torches are tested without cooling liquid. The full value of the test voltages is applied for 2 s between: a) the live part connections and a test electrode with which exposed conductive parts, the metal foil and insulated parts can be contacted; b) the control switch and adjustable control connections and to a test electrode with which the othe
链接地址:https://www.31doc.com/p-3742887.html