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1、BRITISH STANDARD BS EN 13705:2004 Welding of thermoplastics Machines and equipment for hot gas welding (including extrusion welding) The European Standard EN 13705:2004 has the status of a British Standard ICS 25.160.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:35 GMT+00:00 2006
2、, Uncontrolled Copy, (c) BSI BS EN 13705:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 5 August 2004 BSI 5 August 2004 ISBN 0 580 44208 X National foreword This British Standard is the official English language version of EN 13705:2004
3、. The UK participation in its preparation was entrusted to Technical Committee PRI/80, Welding of plastics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement inter
4、national or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purp
5、ort to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committe
6、e any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10,
7、an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
8、 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13705 July 2004 ICS 25.160.30 English version Welding of thermoplastics - Machines and equipment for hot gas welding (including extrusion welding) Soudage des thermoplastiques - Machines et appareillages pour le soudage au gaz chaud (y compris le
9、 soudage par extrusion) Schweien von Thermoplasten - Maschinen und Gerte fr das Warmgasschweien (einschlielich Warmgas- Extrusionsschweien) This European Standard was approved by CEN on 23 April 2004. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condi
10、tions 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 CEN member. This European Standard exists in three
11、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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austr
12、ia, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZ
13、ATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13705:2004: E Licensed Copy: sheffieldun sheffieldun, na
14、, Sun Oct 29 10:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13705:2004 (E) 2 Contents page Foreword3 1 Scope 4 2 Normative references4 3 Requirements.4 3.1 General requirements4 3.1.1 Marking.4 3.1.2 Documentation.4 3.1.3 Accessories Nozzles 4 3.2 Hot gas welding requirements .5 3.2.1 Manual
15、 welding equipment.5 3.2.2 Continuous liner welding machines7 3.3 Extrusion welding requirements7 3.3.1 General7 3.3.2 Automatic shut down 8 3.3.3 Requirements for the plastification system8 3.3.4 Requirements for the preheating system9 3.3.5 Requirements for the welding head.10 3.3.6 Requirements f
16、or the welding shoe.10 3.3.7 Requirements for pressing tools .10 Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13705:2004 (E) 3 Foreword This document (EN 13705:2004) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the s
17、ecretariat of which is held by IBN. 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 January 2005, and conflicting national standards shall be withdrawn at the latest by January 2005. According to
18、the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxe
19、mbourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13705:2004 (E) 4 1 Scope This document specifies general performance
20、requirements of the machines and equipment for welding by hot gas of semi-finished products made from thermoplastics, including hot gas extrusion welding. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the
21、edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 562, Gas welding equipment Pressure gauges used in welding, cutting and allied processes. EN ISO 2503, Gas welding equipment Pressure regulators for gas cylinders used
22、in welding, cutting and allied processes up to 300 bar (ISO 2503:1998). 3 Requirements 3.1 General requirements 3.1.1 Marking All machinery and equipment shall be permanently and clearly marked detailing manufacturer, type of machinery/equipment, serial number or production characteristic number, ch
23、aracteristic data and mains supply. 3.1.2 Documentation Operational and servicing requirements shall be provided with each item of equipment. The minimum details are: technical description of the equipment; specification of suitable welding nozzles; servicing schedule; fault diagnosis and recommende
24、d corrective action. A list of possible malfunctions and errors is recommendable, also containing their causes and details of how they can be remedied. 3.1.3 Accessories Nozzles Welding nozzles shall be designed to be firmly fastened during operation but easily removable for interchangeability. The
25、material used for nozzles shall be corrosion resistant, shall not produce particulates and not be of copper or copper alloy. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13705:2004 (E) 5 3.2 Hot gas welding requirements 3.2.1 Manual we
26、lding equipment 3.2.1.1 Equipment with external air supply 3.2.1.1.1 General The welding gun is composed of handle, heater element and shroud, gas feed hose and electricity supply cable. The design shall be suitable for continuous use without overheating the handle or hot gas temperature variations
27、once set. 3.2.1.1.2 Design and construction Optimum position of centre of gravity; functionally designed handle; infinitely variable adjustment of power consumption; control built into the handle designed and arranged so that accidental actuation is prevented; handle material impact resistant, tempe
28、rature-resistant, heat-insulating and non-conductive; hoses and cables light and flexible; hoses that exhibit no permanent deformation after they have been squeezed. 3.2.1.1.3 Air supply For hot gas welding, air is generally used which is supplied from a compressed air circuit, a compressor, a press
29、ure-gas cylinder or a blower. The air supplied should be as free as possible from water, oil and other pollutions. If the air is taken from a compressed air circuit or compressor, appropriate oil and water filters shall be fitted. The volume of air supplied to the equipment shall be adjustable and k
30、ept constant. 3.2.1.2 Equipment with built-in blower 3.2.1.2.1 General The equipment consists essentially of handle, built-in blower, shroud, heater, nozzle and connection cable. It can be used where there is no external air supply. However, because of its dimensions and weight it is less suitable f
31、or longer welding operations. 3.2.1.2.2 Design and construction 3.2.1.1.2 applies. The following further requirements shall also be met: the fan shall supply the volume of air required for all the nozzles to be used for welding the various types of plastics; heating can be switched off when the fan
32、is operating; the electrical circuit shall ensure that the heating can only be switched on when the fan is also operating. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13705:2004 (E) 6 3.2.1.3 Accessories 3.2.1.3.1 Nozzles The followin
33、g requirements apply, in addition to those given in 3.1.3: to reduce heat radiation, nozzle surface shall be as smooth as possible, for example polished; to reduce friction, the inside surfaces of draw-nozzle sliding contacts shall be polished. The same applies to the sliding surfaces of tack-nozzle
34、s; to avoid air turbulence at nozzle outlet, round nozzles shall have a straight length of at least 5 x D before the mouth (D = outlet diameter of nozzle). 3.2.1.3.2 Temperature measuring equipment The hot gas temperature is the maximum temperature measured inside the nozzle. It is measured inside t
35、he nozzle outlet (with speed-nozzles, the main nozzle aperture) at a depth of 5 mm. Precise measurement of this temperature is possible using a thermocouple which has welding bead diameter 1,5 mm. Before measurement, the welding equipment including nozzle shall be operated for at least ten minutes.
36、3.2.1.3.3 Blowers Blowers are used to directly supply hand-welding equipment with external air supplies. The description of the equipment shall indicate the number of welding machines that can be connected with the admissible nozzle sizes and maximum hose lengths. All connected machines shall be cap
37、able of being supplied with the maximum air quantity required for welding at the welding temperature. The rated warm-up time of the welding machine shall be observed. 3.2.1.3.4 Control equipment Control equipment permits the adjustment (control) and regulation of temperature and flow volume of the h
38、ot gas. It permits the uniform reproducible delivery of the required heat. a) Control equipment for setting and maintaining constant hot gas volume When the gas is taken from a supply pipe, pressure regulators with connected or built-in flowmeters shall be used (construction: floater or measuring di
39、aphragm with pressure indication calibrated in standard litres1). The pressure regulators used shall conform to EN ISO 2503, and the pressure gauges shall conform to EN 562. The connected flowmeter may deviate by up to 3 % from the full-scale value. The type should normally be designed for 100 l in
40、normal state/min at 20 C with medium working pressures of the connected plant. If the gas is taken from blowers, pressure gauges or liquid columns are required to monitor blower pressure, and spill valves and flowmeters shall be used. Pressure gauges conforming to EN 562 or mercury resp. water colum
41、ns shall be used. The spill valves shall be valves with a fixed cone. The connected flowmeter shall be designed for the pressure and temperature of the blower gas (temperature generally 30 C, gas volume 100 l in normal state/min). b) Control equipment for setting heat output With constant gas volume
42、 and constant voltage, series resistances, variable-ratio ring transformers and electronic equipment (e.g. dimmers) are used as setting controls. 1) Standard litres = air volume in litres in normal state, i.e. 0 C and 1 013 mbar. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:08:35 GMT+00
43、:00 2006, Uncontrolled Copy, (c) BSI EN 13705:2004 (E) 7 Consideration shall be given to the effect of temperature on the series resistances. They shall therefore be well adjusted and large enough to reach their operating temperature after ten minutes heating-up time. The output of the hot gas unit
44、can be reduced by up to 7 % by the control system. Therefore, the output of the variable-ratio ring transformers shall be 20 % above the maximum heat output of the hot gas welding unit. c) Temperature control equipment To avoid overheating of the equipment, a temperature control should be fitted whi
45、ch automatically switches off the power supply if the temperature goes too high (e.g. due to failure of air supply). To maintain the hot gas temperature constant, despite fluctuations in the gas volume and operating voltage, regulating units with temperature sensors should be used. The hot gas tempe
46、rature is measured by a temperature sensor and compared with a desired value. Heating output is regulated by a regulating element. The equipment shall be adapted to the hot gas unit output, with the temperature sensor mounted close to the welding nozzle in the hot gas flow. 3.2.1.3.5 Pressure roller
47、s To weld non-rigid thermoplastics, pressure rollers are required. If a filler is used in welding, the feed and pressure roller adjusted to the filler profile shall also move smoothly within the operating temperature range. When lap-welding liners, a cylindrical easy-action roller is used, generally
48、 made of an elastomer material. 3.2.2 Continuous liner welding machines 3.2.2.1 General Continuous liner welding machines consist of an electrically-driven carriage, the hot gas welding unit, built-in blower, heater and nozzle and connection cable, together with a filler reel if required. They are p
49、articularly suitable for the welding of plastic floor coverings and liners. 3.2.2.2 Design and construction The following requirements shall be met in addition to those of 3.2.1.2.2: infinitely-variable adjustment of carriage speed; hot gas welding unit can be swivelled out in order to avoid burning the liners to be welded; automatic shut-off of feed and heater of hot gas welding unit if an obstacle is met. 3.2.2.3 Accessories See 3.2.1.3.1. 3.3 Extr