SANS 10268-1-2009 Welding of thermoplastics - Welding processes Part 1 Heated-tool welding《热塑性塑料的焊接 焊接过程 第1部分:加热焊接工具》.pdf
《SANS 10268-1-2009 Welding of thermoplastics - Welding processes Part 1 Heated-tool welding《热塑性塑料的焊接 焊接过程 第1部分:加热焊接工具》.pdf》由会员分享,可在线阅读,更多相关《SANS 10268-1-2009 Welding of thermoplastics - Welding processes Part 1 Heated-tool welding《热塑性塑料的焊接 焊接过程 第1部分:加热焊接工具》.pdf(24页珍藏版)》请在麦多课文档分享上搜索。
1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22858-3 SANS 10268-1:2009Edition 1.3SOUTH AFRICAN NATIONAL STANDARD Welding of thermoplastics Welding processes Part 1: Heated-tool weldin
4、g Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 10268-1:2009 Edition 1.3 Table of changes Change No. Date Scope 1 2002 Amended to be aligned with international specifications for poly
5、ethylene pipes, to update referenced standards, and to replace withdrawn referenced standards. 2 2007 Amended to change the designation of SABS standards to SANS standards, with no technical changes. 3 2009 Amended to update referenced standards. Acknowledgement The SABS Standards Division wishes to
6、 acknowledge the valuable assistance derived from publications of the Deutscher Verband fr Schweisstechnik (German Welding Engineering Association). Foreword This South African standard was approved by SABS TC 1041, Welding of thermoplastics, in accordance with procedures of the SABS Standards Divis
7、ion, in compliance with annex 3 of the WTO/TBT agreement. This document was published in August 2009. This document supersedes SANS 10268-1:2007 (edition 1.2). A vertical line in the margin indicates where the text has been technically modified by amendment No. 3. SANS 10268 consists of the followin
8、g parts under the general title, Welding of thermoplastics Welding processes: Part 1: Heated-tool welding. Part 2: Electrofusion welding. Part 3: Hot-gas welding. Part 4: Hot-gas extrusion welding. Part 5: Solvent welding. Part 10: Weld defects. Annex A is for information only. SANS 10268-1:2009 Edi
9、tion 1.3 1 Contents Page Acknowledgement Foreword 1 Scope . 3 2 Normative references . 3 3 Definitions 4 4 General requirements 5 5 Heated-tool butt welding 5 6 Testing and approval . 14 7 Heated-tool socket welding 14 Annex A (informative) Bibliography 19 SANS 10268-1:2009 Edition 1.3 2 This page i
10、s intentionally left blank SANS 10268-1:2009 Edition 1.3 3 Welding of thermoplastics Welding processes Part 1: Heated-tool welding 1 Scope This part of SANS 10268 covers the welding of thermoplastics using the heated-tool butt welding (HS) and heated-tool socket welding (HD) processes. It refers spe
11、cifically to polypropylene homopolymer (PP-H), polypropylene block copolymer (PP-B), polypropylene random copolymer (PP-R), polyvinylidene fluoride (PVDF) and high-density polyethylene (PE-HD). 2 Normative references The following standards contain provisions which, through reference in this text, c
12、onstitute provisions of this part of SANS 10268. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of that standard, parties to agreements based on this part of SANS 10268 are encouraged to take steps to ensure the use of t
13、he most recent editions of the standards indicated below. Information on currently valid national and international standards can be obtained from the SABS Standards Division. ISO 8085-1, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels Metric series Specificatio
14、ns Part 1: Fittings for socket fusion using heated tools. Amdt 1 ISO 8085-2, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels Metric series Specifications Part 2: Spigot fittings for butt fusion, for socket fusion using heated tools and for use with electrofusion
15、 fittings. Amdt 1 SANS 4427-2/ISO 4427-2, Plastics piping systems Polyethylene (PE) pipes and fittings for water supply Part 2: Pipes. Amdt 3 SANS 6269, Welding of thermoplastics Test methods for welded joints. SANS 10269, Welding of thermoplastics Testing and approval of welders. SANS 10270, Weldin
16、g of thermoplastics Approval of welding procedures and welds. SANS 15874-2/ISO 15874-2, Plastics piping systems for hot and cold water installations Polypropylene (PP) Part 2: Pipes. Amdt 3 SANS 10268-1:2009 Edition 1.3 4 3 Definitions For the purposes of this part of SANS 10268, the following defin
17、itions apply: 3.1 bead-forming the process of initial heating of the joint faces under pressure which results in the formation of a molten bead of plastics around the inside and outside circumferences of the joint NOTE This process is also known as adapting or equalization. 3.2 bead-forming pressure
18、 the pressure required to ensure the correct formation of the beads on the inside and outside circumferences of the joint 3.3 bead-forming time the time that the bead-forming pressure has to be sustained to ensure correct formation of the beads on the inside and outside circumferences of the joint 3
19、.4 changeover time the time required to remove the heating plate and bring the joint components together under joining pressure NOTE The changeover time has to be kept to an absolute minimum to prevent cooling of the molten plastics. 3.5 heating time the time required to ensure that the plastics in
20、the joint components have been melted to a sufficient depth to ensure a homogeneous joint NOTE This time is also known as soaking time. 3.6 joining pressure the pressure required to ensure complete fusion of the molten plastics in the joint components 3.7 joining time the time taken to increase the
21、joining pressure gradually on joining to the final pressure required plus the time that this pressure is maintained while the joint cools 3.8 peeling diameter the diameter to which the pipe end is machined before the joint is made 3.9 weld bead the portion of molten plastics that is pressed out of t
22、he joint by the bead-forming and joining pressures 3.10 welding the process of fusing two or more metal or plastics components with the aid of heat, or (in the case of plastics only) with the aid of a solvent, to form a homogeneous, permanent whole that is characterized by the welding method used. I
23、n both cases pressure may be applied to assist the welding process SANS 10268-1:2009 Edition 1.3 5 3.11 weld zone the area of the parent material in which material flow will occur between the components of the weld owing to the effect of heat, pressure or solvents, or a combination of any of these,
24、on the material 4 General requirements As humidity, strong sunlight (heat), wind and temperatures below 5 C can cause serious problems and result in bad weld joints, the weld zone shall be protected from these conditions by means that will provide an environment conducive to good weld joints. Shelte
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