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 BS EN 13705:2004 This British Standard was published under the authority of the
2、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. The UK participation in its preparation was entrusted to Technical Committee PRI/80, Welding of plastics, w
3、hich 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 international or European publications referred to in this document may be found in the BSI Catalogue under the se
4、ction 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 purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
5、 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 committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor r
6、elated 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, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the
7、 document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN13705 July2004 ICS25.160.30 Englishversion WeldingofthermoplasticsMachinesandequipmentforhotgas welding(includingextrusionwelding) SoudagedesthermoplastiquesMachinese
8、tappareillages pourlesoudageaugazchaud(ycomprislesoudagepar extrusion) SchweienvonThermoplastenMaschinenundGertefr dasWarmgasschweien(einschlielichWarmgas Extrusionsschweien) ThisEuropeanStandardwasapprovedbyCENon23April2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipul
9、atetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,Frenc
10、h,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,
11、Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Br
12、ussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN13705:2004:EEN 13705:2004 (E) 2 Contents page Foreword3 1 Scope 4 2 Normative references 4 3 Requirements.4 3.1 General requirements4 3.1.1 Marking .4 3.1.2 Documentation.4 3.1.3 Accessories
13、 Nozzles 4 3.2 Hot gas welding requirements .5 3.2.1 Manual welding equipment.5 3.2.2 Continuous liner welding machines 7 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
14、.5 Requirements for the welding head.10 3.3.6 Requirements for the welding shoe.10 3.3.7 Requirements for pressing tools .10 EN 13705:2004 (E) 3 Foreword This document (EN 13705:2004) has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN. This Europe
15、an 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 the CEN/CENELEC Internal Regulations, the natio
16、nal 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, Luxembourg, Malta, Netherlands, Norway, Poland, Por
17、tugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 13705:2004 (E) 4 1 Scope This document specifies general performance requirements of the machines and equipment for welding by hot gas of semi-finished products made from thermoplastics, including hot gas extrusion welding.
18、 2 Normative references The following referenced documents 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. EN 562, Gas welding equip
19、ment Pressure gauges used in welding, cutting and allied processes. EN ISO 2503, Gas welding equipment Pressure regulators for gas cylinders used 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
20、shall be permanently and clearly marked detailing manufacturer, type of machinery/equipment, serial number or production characteristic number, characteristic data and mains supply. 3.1.2 Documentation Operational and servicing requirements shall be provided with each item of equipment. The minimum
21、details are: technical description of the equipment; specification of suitable welding nozzles; servicing schedule; fault diagnosis and recommended corrective action. A list of possible malfunctions and errors is recommendable, also containing their causes and details of how they can be remedied. 3.
22、1.3 Accessories Nozzles Welding nozzles shall be designed to be firmly fastened during operation but easily removable for interchangeability. The material used for nozzles shall be corrosion resistant, shall not produce particulates and not be of copper or copper alloy. EN 13705:2004 (E) 5 3.2 Hot g
23、as welding requirements 3.2.1 Manual welding 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 ha
24、ndle or hot gas temperature variations 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;
25、handle material impact resistant, temperature-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 compre
26、ssed air circuit, a compressor, a pressure-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
27、the equipment shall be adjustable and kept 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 dime
28、nsions and weight it is less suitable for 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; he
29、ating can be switched off when the fan is operating; the electrical circuit shall ensure that the heating can only be switched on when the fan is also operating. EN 13705:2004 (E) 6 3.2.1.3 Accessories 3.2.1.3.1 Nozzles The following requirements apply, in addition to those given in 3.1.3: to reduce
30、 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-nozzles; to avoid air turbulence at nozzle outlet, round nozzles shall hav
31、e 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 the nozzle outlet (with speed-nozzles, the main nozzle aperture) at a
32、 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. 3.2.1.3.3 Blowers Blowers are used to directly supply hand-welding e
33、quipment 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 capable of being supplied with the maximum air quantity required for we
34、lding 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 hot gas. It permits the uniform reproducible delivery of the required
35、 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 diaphragm with pressure indication calibrated in standard litres 1) .
36、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 normal state/min at 20 C with medium working pressures of the conn
37、ected 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 columns shall be used. The spill valves shall be valves with a fixed co
38、ne. 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 and constant voltage, series resistances, variable-ratio ring tra
39、nsformers 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. EN 13705:2004 (E) 7 Consideration shall be given to the effect of temperature on the series resistances. They shall therefore be well ad
40、justed and large enough to reach their operating temperature after ten minutes heating-up time. The output of the hot gas unit 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 w
41、elding unit. c) Temperature control equipment To avoid overheating of the equipment, a temperature control should be fitted which 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 fl
42、uctuations in the gas volume and operating voltage, regulating units with temperature sensors should be used. The hot gas temperature 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
43、gas unit output, with the temperature sensor mounted close to the welding nozzle in the hot gas flow. 3.2.1.3.5 Pressure rollers 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 mov
44、e smoothly within the operating temperature range. When lap-welding liners, a cylindrical easy-action roller is used, generally 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
45、 gas welding unit, built-in blower, heater and nozzle and connection cable, together with a filler reel if required. They are particularly 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
46、.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 Extrusion welding requi
47、rements 3.3.1 General The machinery and equipment is composed of: a plastification system to plastify the welding material, either rod or granulate; a preheating system for warming the surfaces of the joint; EN 13705:2004 (E) 8 a welding head for welding machinery and; a welding shoe. The design of
48、the machinery and the equipment shall ensure that: they are capable of functioning within the temperature ranges specific to the material being welded; mechanical conditions they are exposed to during transport and operation do not lead to damage or malfunction; they are sufficiently protected against corrosion, both from moisture ingress from the outside and from the welding material on the internal surfaces and on the screw; elements of the machinery and/or equipment are ergonomically designed in term
