www bzfxw com 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[.]
BRITISH STANDARD 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 BS EN 50078:1994 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland This British Standard, having been prepared under the direction of the Welding Standards Policy Committee, was published 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 580 23072 Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom Amendments issued since publication Amd No Date Comments BS EN 50078:1994 Contents Cooperating organizations National foreword Foreword Text of EN 50078 National annex NA (informative) Committees responsible National annex NB (informative) Cross-references © BSI 03-1999 Page Inside front cover ii Inside back cover Inside back cover i BS EN 50078:1994 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 European 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 their 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 to 16, an inside back cover and a back cover This standard 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 ii © BSI 03-1999 EUROPEAN STANDARD EN 50078 NORME EUROPÉENNE December 1993 EUROPÄISCHE NORM UDC 621.791.75.03:620-1:614.8 Descriptors: Arc welding, torches, requirements, tests English version Torches and guns for arc welding Torches pour le soudage l’arc Brenner zum Lichtbogenschweißen ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 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 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 Central Secretariat or to any CENELEC member This European Standard exists in three official versions (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 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 Comité Européen de Normalisation Electrotechnique Europäisches Komitee für 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 Foreword This European Standard was prepared by CENELEC Technical Committee TC 26A, Electric arc welding It was submitted to the CENELEC members for formal vote in September 1992 and was approved by CENELEC as EN 50078:1993 on December 1993 The following dates were fixed: — 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 For products which have complied with the relevant national standard before 1994-06-01, as shown by the manufacturer or by a certification 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 normative Contents Foreword Section General Scope Normative references Environmental conditions Definitions 4.1 torch; gun 4.2 body 4.3 handle 4.4 nozzle 4.5 non-consumable electrode (TIG, plasma) 4.6 electrode wire (MIG, MAG, MOG) 4.7 contact tip (MIG, MAG, MOG) 4.8 cable-hose assembly 4.9 MIG/MAG torch 4.10 MOG torch 4.11 TIG torch 4.12 plasma torch 4.13 plasma welding torch 4.14 manual torch 4.15 mechanically guided torch 4.16 air cooled torch 4.17 liquid cooled torch 4.18 motorized torch 4.19 spool-on-torch Classification 5.1 Process 5.2 Method of guidance 5.3 Voltage class 5.4 Type of cooling Section Requirements and tests Test conditions Protection against electric shock 7.1 Insulation resistance 7.2 Dielectric strength 7.3 Protection against direct contact 7.3.1 Class M torches Thermal rating 8.1 Temperature rise 8.2 Heating test 8.2.1 MIG/MAG and MOG torch 8.2.2 TIG and plasma welding torch 8.3 Duration of the heating test Page 5 5 5 5 5 5 5 6 6 6 6 6 6 6 7 7 7 8 8 10 10 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 03-1999 EN 50078:1993 Page 8.4 Determination of the ambient air temperature 8.5 Cooling liquid 8.6 Resistance to weld spatter Impact resistance 10 Marking 11 Instructions for use Annex A (informative) Additional terminology Annex B (normative) Position of the welding torches for the heating test Annex C (informative) Cooled copper block Figure — Device for testing the resistance to weld spatter Figure — Device for the impact test Figure A.1 — MIG/MAG/MOG torch Figure A.2 — MIG/MAG/MOG gun Figure A.3 — TIG gun Figure A.4 — Plasma torch Figure A.5 — Supply unit Figure B.1 — MIG/MAG and MOG torches Figure B.2 — TIG torches Figure B.3 — Plasma welding torches Figure C.1 — Example for a water-cooled copper block Table — Dielectric test voltages Table — Degree of protection for manual torches Table — Degree of protection for mechanically guided torches Table — Test values for MIG welding of aluminium alloys Table — Test values for MAG welding of mild steel Table — Test values for MAG welding with flux cored wire Table — Test values for MOG welding of mild steel Table — Test values for TIG welding Table — Test values for plasma welding © BSI 03-1999 11 11 11 11 11 11 13 15 16 12 12 14 14 14 14 14 15 15 15 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 16 7 9 10 10 10 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ blank EN 50078:1993 Section General Scope This standard is applicable 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 protection against direct contact is provided by other means This standard specifies safety and construction requirements 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 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 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 NOTE In this standard the terms “torch” and “gun” are, for most purposes, interchangeable For convenience “torch” has been used in the following text 4.2 body 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 operator’s 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-consumable 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 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Environmental conditions 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) Relative humidity of the air: up to 90 % at 20 °C Definitions For the purpose of this standard, the following definitions apply NOTE Additional 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) 4.7 contact tip (MIG, MAG, MOG) a replaceable metal 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 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 NOTE MIG 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 shielded by the slag of the molten core The arc is shielded by gas produced during melting of the core NOTE MOG is an abbreviation for “Metall ohne Gas” (metal without gas) NOTE In the case of a torch the handle is 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 © BSI 03-1999 EN 50078:1993 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 NOTE TIG is an abbreviation for “tungsten inert gas” 4.12 plasma torch a torch using a non-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 operator’s hand and guided manually 4.15 mechanically guided torch a torch held and guided mechanically 4.16 air cooled torch a torch 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 Classification 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 electrode 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 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 5.3 Voltage class The voltage classes are characterized by: a) the maximum rated voltage with the 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) © BSI 03-1999 EN 50078:1993 Section Requirements and tests Test conditions 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 shall be: a) electrical measuring instruments: class 0,5; b) temperature measuring device: Protection against electric shock 7.1 Insulation resistance The insulation resistance of a new torch shall, after the humidity treatment, be not less than the following values: — voltage class M: M The insulation shall withstand the test voltages of Table and a high frequency test voltage if applicable without flashover or breakdown, as manifested by a decrease in the applied voltage Any discharges unaccompanied by a voltage drop are disregarded Table — Dielectric test voltages Voltage class L M Test voltage V r.m.s 000 500 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 a pulse width of 0,2 Ès to Ès, 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 they 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 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 other live part connections can be contacted ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 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-cooled torches without cooling liquid) is brought to a temperature between t and t + °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 metal 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 the other live parts, © BSI 03-1999 7.2 Dielectric strength ± K 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 — voltage class L: M the reading being made after stabilization of the measurement 7.3 Protection against direct contact According to EN 60529 the degree of protection shall correspond to the requirements given in Table and Table Table — Degree of protection for manual torches Class Nozzle orifice Handle Other parts L IP 0X IP 3X IP 3X M IP 3X IP 4X IP 3X EN 50078:1993 Table — Degree of protection for mechanically guided torches Class Nozzle orifice Other parts L IP 0X IP 2X M IP 2X IP 2X Compliance shall be checked according to EN 60529 7.3.1 Class M torches Class M torches shall be so designed: 1) that an interlocking device de-energizes the torch when parts are removed to expose the electrode or 2) that the parts that expose the electrode can be removed and replaced only by use of a tool The conditions for complying with this requirement shall be given in the instructions for use [see 11 h)] Compliance shall be checked by a functional test together with the corresponding power source Thermal rating 8.1 Temperature rise The temperature rise at any point on the outer surface of the part of the handle gripped by the operator shall not exceed 30 K The temperature rise at any point on the outer surface of the cable-hose assembly shall not exceed 40 K After completion of the tests safety and operability of the torch shall not be impaired Compliance shall be checked by the heating test according to 8.2 8.2 Heating test Each heating test shall be carried out on a torch, fitted with the cable-hose assembly normally supplied with it The length of the cable-hose assembly shall be m to m For the purpose of the test the cable-hose assembly to the torch shall be connected directly to the welding power source or the wire feed unit The torches shall be loaded with the rated current and the type of voltage as given in the instructions for use [see 11 d)] The load voltage shall be measured between the workpiece used in the test and the supply end of the welding cable of the cable-hose assembly In the case of a.c current, steps shall be taken to ensure that the load current is symmetrical The measured value of the current shall be r.m.s, and the frequency 50 Hz or 60 Hz In the case of d.c the mean value shall be taken and the electrode polarity shall be chosen in accordance with 8.2.1 and 8.2.2 A temperature measuring device shall be fixed at the hottest spot on the handle and the cable-hose assembly The temperature measuring device, handle and cable-hose assembly shall be protected from draughts and radiant heat The torch clamping device used shall not significantly affect the test result e.g by heat loss Torches shall be continuously Cooled with the flow and load loss conditions specified by the manufacturer The temperature reading shall be taken after half the loading period of the last cycle 8.2.1 MIG/MAG and MOG torch ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ A metal tube 400 mm to 500 mm in diameter and at least 500 mm long is horizontally clamped into a rotating device The inside of the tube is cooled by means of water The torch shall be positioned in a plane perpendicular to the tube axis in such a way, that the handle is on the cooler side and the electrode wire is 15° to the vertical (see Figure B.1) The torch shall be moved parallel to the centre line of the tube in order to form a weld bead a) Test conditions for MIG welding of aluminium alloys Electrode wire: aluminium % to % magnesium Type of voltage: d.c.; electrode polarity: positive Shielding gas: argon Tube material: AlMg to AlMg Load voltage: U2 = 14 + 0,05 l2 (max 30 V) © BSI 03-1999 EN 50078:1993 Table — Test values for MIG welding of aluminium alloys Welding current Diameter of the electrode wire Distance between contact tip and metal tube Welding speeda Gas flow ±5% Thickness of tubea A mm mm cm/min l/min mm up to 150 151 to 200 201 to 300 301 to 350 351 to 500 above 500 a 12 12 12 22 22 22 10 12 15 18 20 20 65 60 55 50 45 40 10 15 18 22 26 28 0,8 1,2 1,6 2,4 Recommended values Table — Test values for MAG welding of mild steel Welding current Diameter of the electrode wire Distance between contact tip and metal tube Welding speeda Gas flow ±5% Thickness of tubea A mm mm cm/min l/min mm up to 150 151 to 250 251 to 350 351 to 500 above 500 a Recommended values 12 12 12 25 25 10 13 15 20 25 70 60 55 50 45 10 15 18 22 26 0,8 1,2 1,6 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Table — Test values for MAG welding with flux-cored wire Welding current Diameter of the electrode wire Distance between contact tip and metal tube Welding speeda Gas flow ±5% Thickness of tubea A mm mm cm/min l/min mm 250 to 350 351 to 500 above 500 a 1,2 to 1,4 1,6 to 2,4 25 30 35 55 50 40 15 18 20 12 25 25 Recommended values b) Test conditions for MAG welding of mild steel Electrode wire: rutile type Electrode wire: mild (low carbon) steel Type of voltage: d.c.; electrode polarity: positive Shielding gas: argon/CO2 mixed gas (80/20 nominal) Tube material: mild (low carbon) steel Load voltage: U2 = 14 + 0,05 l2 (max 44 V) If additional values for the shielding gas CO2 are specified in the instructions for use, an additional test with this gas shall be carried out according to the test conditions c) Test conditions for MAG welding with flux cored wire © BSI 03-1999 Type of voltage: d.c.; electrode polarity: positive Shielding gas: argon/CO2 mixed gas (80/20 nominal) Tube material: mild (low carbon) steel Load voltage: U2 = 14 + 0,05 l2 (max 44 V) d) Test conditions for MOG welding of mild steel Electrode wire: type 1: T XX YN1 type 2: T XX WN2 NOTE Both types are classified in prEN 758 “Classification of tubular cored electrodes for metal arc welding with or without gas shield of non alloy and fine grain steels” NOTE T XX YN1 is a wire designed with a fast freezing slag for all-positional welding EN 50078:1993 T XX WN2 is a wire designed for high deposition rates in flat and horizontal vertical position welding Table — Test values for MOG welding of mild steel Welding current Type of electrode wire Diameter of the electrode Distance between contact tip and metal tube Welding speeda Thickness of tubea mm mm cm/min mm A 2 up to 250 251 to 350 351 to 500 above 500 a Recommended up to 1,2 1,6 to 2,0 2,4 to 3,0 3,2 and more 20 50 50 60 60 55 50 40 12 12 25 25 values Table — Test values for TIG welding Welding current Gas flow ±5% Distance between nozzle and copper block Distance between electrode and copper block A l/min mm mm up to 100 101 to 150 151 to 200 201 to 300 301 to 350 5 5 5 5 5 11 13 15 Load voltage: Type of voltage: electrode d.c.; wire: type 1: polarity negative type 2: polarity positive Tube material: mild (low carbon) steel Load voltage: U2 = 14 + 0,05 l2 (max 44 V) 8.2.2 TIG and plasma welding torch A copper block, with or without water cooling (see e.g Annex C), shall be used and the torch shall be positioned perpendicular to the upper horizontal face of the copper block (see Figure B.2 and Figure B.3) For plasma welding torches the shielding gas and the gas flow shall be as specified by the manufacturer in the instructions for use The testing installation shall be equipped with the instruments as shown in Figure A.5 The nominal a.c welding currents of torches are defined as 70 % of the nominal d.c values a) Test conditions for TIG welding Electrode type: tungsten Electrode diameter: maximum for the test current as recommended by the manufacturer Type of voltage: d.c.; electrode polarity: negative Shielding gas: argon 10 U2 = 10 + 0,04 l2 (max 34 V) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ b) Test conditions for plasma welding Type of voltage: d.c Gases and gas flow: as specified by the manufacturer Table — Test values for plasma welding Welding current Distance between nozzle and copper block A mm up to 30 31 to 50 51 to 100 101 to 150 151 to 200 201 to 250 251 to 280 above 280 3 8 10 8.3 Duration of the heating test Each heating test shall be carried out for a period of not less than 30 minutes until the rate of temperature rise does not exceed K/h The cycle time for test purposes shall be 10 minutes © BSI 03-1999 EN 50078:1993 The temperature shall be measured during the last 10 minutes in the case of continuous load [100% duty cycle (duty factor)] For lower duty cycles it shall be measured in the middle of the load periods during the last two cycles 8.4 Determination of the ambient air temperature The temperature measuring device shall be located at a distance of m at the same height as the torch and shall be protected from draughts and radiant heat 8.5 Cooling liquid The cooling liquid system of liquid-cooled torches shall allow the specific flow rate of liquid at the minimum inlet pressure as stated by the manufacturer The temperature of the cooling liquid during the heating test shall be (40 ± 5) °C at the entry of the cable-hose assembly Compliance shall be checked during the heating test by measuring the flow rate, the inlet pressure and the cooling liquid temperature 8.6 Resistance to weld spatter 10 Marking The following information shall be legibly and indelibly marked on each torch: a) Name of the manufacturer, distributor, importer or the registered trade-mark; b) Type (identification) as given by the manufacturer; NOTE It is recommended for safety reasons that the type (identification) should be such that it is not easily confused with the current rating ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ The insulation of the handle shall be capable of withstanding the effects of a normal amount of weld spatter without being completely penetrated or ignited Compliance shall be checked with a device according to Figure An electric current of approximately 23 A is passed through the rod until a steady thermal state at a temperature of (250 ± 5/0) °C is reached This temperature shall be measured by a contact thermometer or thermocouple The heated rod in a horizontal position is then applied to the insulation of the handle for The heated rod shall not penetrate into the insulation more than 1,5 mm and shall not contact live parts The penetration shall be measured from the outer surface of the main body of the insulation thus excluding ribs and other protrusions An attempt is made to ignite any gases which may be emitted in the region of the contact point by means of an electric spark or small flame If the gases are flammable, the burning shall stop as soon as the heated rod is removed Impact resistance This clause does not apply to mechanically guided, motorized and spool-on-torches Torches shall have sufficient mechanical strength to ensure that, when used in accordance with the requirements, no damage occurs which will impair the safety or operability © BSI 03-1999 Fragile parts such as ceramic nozzles etc., which if damaged impair the operability, may be replaced after the test Compliance shall be checked by the following impact test and visual inspection The torch and cable-hose assembly, at its full m extension, is lifted to a height of m, i.e 0,2 m above the level of the point where the cable-hose is fixed as shown in Figure The torch is released without initial velocity and allowed to fall onto the steel plate This procedure shall be repeated 10 times, the torch falling on its different parts c) Reference to this standard, confirming that the torch complies with its requirements Example: Manufacturer — type — Standard XXX — YYY — EN 50078 Compliance shall be checked by reading the marking 11 Instructions for use Each torch shall be delivered with an instruction sheet This instruction sheet shall include as a minimum the following information: a) process (see 5.1); b) method of guidance (see 5.2); c) voltage class (see 5.3); d) the relationship (e.g in a table) between: 1) rated current at 100 % (continuous duty), 60 % and 35 % duty cycle (duty factor) and maximum rated current; 2) corresponding duty cycle (duty factor); 3) type of voltage; 4) type of shielding gas (e.g argon, CO2 or mixed gases with their percentage); 5) length of the cable-hose assembly; and 6) type and diameter range of the electrode; e) gas flow rate in l/min; 11 EN 50078:1993 f) type of cooling (see 5.4); and for liquid-cooled torches: 1) maximum cooling liquid temperature in °C at the input of the cable-hose assembly; 2) minimum flow rate in l/min; 3) minimum inlet pressure in bar; and 4) maximum inlet pressure in bar; g) rating of auxiliary electrical controls incorporated in the torch; h) requirements for the connection of the torch; i) essential information about the safe operation of the torch Compliance shall be checked by reading the instructions ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure — Device for testing the resistance to weld spatter Figure — Device for the impact test 12 © BSI 03-1999 EN 50078:1993 Annex A (informative) Additional Terminology The following terms and drawings, although not used in the body of this standard, are given as a useful aid to comprehend the construction and design of torches nozzle buse Gasdüse insulator canon isolant Isolierstück contact tip tube-contact Kontaktdüse tip adaptor with or without gas diffusor adapteur avec ou sans diffuseur Düsenstock mit oder ohne gaz Gasleitring neck lance Brennerhals torch body corps de torche Brennerkörper handle manche Handgriff cable hose assembly gaine enveloppe Schlauchpaket body housing enveloppe de corps de torche Brennerkörpergehäuse 10 hand shield protège-mains Handschutz 11 gas lens filter filtre de diffuseur Gaslinsenfilter 12 gas lens diffuseur de gaz Gaslinse 13 collet body porte-pince Spannhülsengehäuse 14 heat shield bague d’étanchéité Isolator 15 collet pince porte-électrode Spannhülse 16 electrode electrode Elektrode 17 back cap (short) bouchon (court) Brennerkappe (kurz) 18 back cap (long) bouchon (long) Brennerkappe (lang) 19 plasma tip tuyère Plasmadüse 20 gas distributor distributeur de gaz Gasleithülse 21 gas diffuser diffuseur de gaz Gasleitring 22 flow meter débitmètre Durchflulßmesser 23 thermometer thermomètre Thermometer 24 inlet pressure pression d’entrée Eingangsdruck 25 cooling liquid liquide de refroidissement Kühlflüssigkeit 26 shielding gas gaz de protection Schutzgas 27 plasma gas gaz plasma Plasmagas 28 wire feed unit dévidoir Drahtvorschubgerät © BSI 03-1999 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 13 EN 50078:1993 Figure A.1 — MIG/MAG/MOG torch Figure A.3 — TIG gun Figure A.2 — MIG/MAG/MOG gun ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure A.4 — Plasma torch Figure A.5 — Supply unit 14 © BSI 03-1999 EN 50078:1993 Annex B (normative) Position of the welding torches for the heating test Figure B.1 — MIG/MAG and MOG torches Figure B.2 — TIG torches Figure B.3 — Plasma welding torches ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ cable hose assembly to the supply unit (Figure A.5) gaine enveloppe vers l’unité d’alimentation (Figure A.5) Schlauchpaket zur Versorgungseinheit (Bild A.5) 30 torch torche Brenner 31 adjustment unit dispositif de postionnement Einstellvorrichtung 32 metal tube tube métallique Metallrohr 33 copper block bloc en cuivre Kupferblock © BSI 03-1999 15 EN 50078:1993 Annex C (informative) Cooled copper block ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure C.1 — Example for a water-cooled copper block 16 © BSI 03-1999