1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationWelding Basic weld joint details in steelPart 3: Clad, buttered and lined pressurized componentsBS EN 1708-3:2012National forewordThis British Standard is the UK implementation o
2、f EN 1708-3:2012.The UK participation in its preparation was entrusted to Technical CommitteeWEE/-/1, Briefing committee for welding.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisi
3、ons of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 66705 3ICS 25.160.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published und
4、er the authority of the StandardsPolicy and Strategy Committee on 31 March 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 1708-3:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1708-3 March 2012 ICS 25.160.40 English Version Welding - Basic weld joi
5、nt details in steel - Part 3: Clad, buttered and lined pressurized components Soudage - Descriptif de base des assemblages souds en acier - Partie 3: Composants plaqus, beurrs et doubls soumis la pression Schweien - Verbindungselemente beim Schweien von Stahl - Teil 3: Plattierungen, Pufferungen, Au
6、skleidungen druckbeanspruchter Bauteile This European Standard was approved by CEN on 28 January 2012. CEN 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.
7、Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by tra
8、nslation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finl
9、and, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROP
10、ISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1708-3:2012: EBS EN 1708-3:2012EN 1708-3:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative re
11、ferences 43 Terms and definitions .54 Requirements .54.1 General 54.2 Dissimilar metal joints .54.3 Welds for clad steel .64.4 Weld design examples 6Bibliography . 18Tables Table 1 Clad steels. 6Table 2 Linings 8Table 3 Dissimilar metal joints 11Table 4 Complex connections . 14BS EN 1708-3:2012EN 17
12、08-3:2012 (E) 3 Foreword This document (EN 1708-3:2012) has been prepared by Technical Committee CEN/TC 121 “Welding”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at th
13、e latest by September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying an
14、y or all such patent rights. EN 1708, Welding - Basic weld joint details in steel consists of the following parts : Part 1: Pressurized components Part 2: Non internal pressurized components Part 3: Clad, buttered and lined pressurized components According to the CEN/CENELEC Internal Regulations, th
15、e national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Nether
16、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1708-3:2012EN 1708-3:2012 (E) 4 1 Scope This European Standard complements EN 1708-1 with regard to applications in industrial, chemical and pharmaceutical sectors. It speci
17、fies established examples on how to construct claddings, linings and dissimilar joints and complex connections relevant to the welding technology and with regard to pressurized components (e.g. vessels, boilers and piping). In the following text therefore the term pressurized components will be used
18、. These examples can also be used for other applications provided the relevant requirements are taken into account. For exceptional cases such as specific problems concerning corrosion or materials in need of special processes, other solutions can be necessary which are to be agreed upon between pur
19、chaser and manufacturer. Appropriate national regulations and corresponding design specifications are to be followed when selecting design examples as well as, if applicable, different or further requirements. This European Standard does not override conditions on dimensioning of welded joints regar
20、ding strength (e.g. according to EN 12952, EN 12953, EN 13445 and EN 13480). It is to be applied in accordance with the specified application limits for pressurized components subject to compression stress with bearing wall thicknesses 30 mm. This limit is chosen for structural reasons and not for t
21、he heat treatment that may be required. The wall thickness limit applies to butt welds in the bearing vessel wall only and does not apply to flanges, torispherical heads, flat ends or other similar parts. This European Standard applies to the following types of steel: non alloyed steels with a minim
22、um tensile strength of Rm 450 MPa; P295GH and 16Mo3 according to EN 10028-2; fine-grain steels according to EN 10028-3 with a minimum yield point ReL 355 MPa; austenitic steels according to EN 10028-7. This European Standard can also be applied to other steels and/or larger wall thicknesses, provide
23、d that an agreement has been made between the manufacturer and the purchaser/operating authority. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited a
24、pplies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1011-5, Welding Recommendations for welding of metallic materials Part 5: Welding of clad steel EN 1708-1:2010, Welding Basic welded joint details in steel Part 1: Pressurized compone
25、nts EN 10028-2, Flat products made of steels for pressure purposes Part 2: Non-alloy and alloy steels with specified elevated temperature properties EN 10028-3, Flat products made of steels for pressure purposes Part 3: Weldable fine grain steels, normalized EN 10028-7, Flat products made of steels
26、for pressure purposes Part 7: Stainless steels ISO/TR 25901:2007, Welding and related processes Vocabulary BS EN 1708-3:2012EN 1708-3:2012 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/TR 25901:2007 and the following apply. 3.1 heterogeneous
27、joint welded joint in which the weld metal and parent material have significant differences in mechanical properties and/or chemical composition SOURCE: ISO/TR 25901:2007, 2.180 3.2 homogeneous joint Welded joint in which the weld metal and parent material have no significant differences in mechanic
28、al properties and/or chemical composition SOURCE: ISO/TR 25901:2007, 2.186 3.3 lining metallic stratum (e. g. sheet, plate, tube or stripe) partly connected to the inner surface of a component 4 Requirements 4.1 General The examples in Table 1 to Table 4 are based on commonly accepted practice and g
29、ive general information for design conditions and welding procedures. Other welding or design conditions should be included in the welding procedure specification (WPS) and have to be specified. NOTE Metallic materials are assigned to groups in Welding Guidelines. Specifications of this grouping sys
30、tem are defined by the Technical Report CEN ISO/TR 15608. For European material designations the material groups with the corresponding material designations or material numbers and the technical delivery conditions can be found in the Technical Report CEN ISO/TR 20172. In many industrial sectors, i
31、n particular corrosion resistance shall also be guaranteed for pressurized components. The selection of appropriate materials and their use in established wall thicknesses or designs thus plays an important role. Knowledge gained through experience has been pivotal regarding the material types and w
32、all thickness ranges mentioned above for applications with design elements described in this European Standard. 4.2 Dissimilar metal joints Regarding the welding of non alloy steels to austenitic steels, the filler metals to be chosen are determined by one of the following cases: a) If the weld is n
33、ot post weld heat-treated and the operating temperature 300 C throughout, then austenitic filler metals which have been tested for suitability can be chosen. b) If the weld is post weld heat-treated and/or subject to operating temperatures 300 C, then filler metals which have been tested for suitabi
34、lity, such as nickel-based high alloys or other metals, can be used. Strength values of the filler metals which differ from that of the base material may need to be taken into account during calculations. BS EN 1708-3:2012EN 1708-3:2012 (E) 6 4.3 Welds for clad steel EN 1011-5 is applicable to the w
35、elding of clad steel. Care shall be taken concerning the suitability of filler metals used when welding the butter positions. If a post-weld heat treatment is planned, or if the weld is to be applied at operating temperatures 300 C, then particular specifications are required. The welding consumable
36、s for buttering can also be applied beyond the filling run, even for final runs, if the corrosion resistance is known to be sufficient. In general, the weld surface of the buttering does not need to be machined. Special surface conditions (such as grinded or polished) shall be specified in the manuf
37、acturing documents. 4.4 Weld design examples Examples of weld design are given in Tables 1 through 4. Table 1 Clad steels 1 Clad connections Observe the supplementary design rules according to No 3.1 and No 3.2 in Table 3. The thickness of austenitic cladding tpis in general 2 mm to 4 mm. The propor
38、tion of austenitic weld metal in the bearing cross-section has to be taken into account for the calculation according to the calculation rules. Differences in wall thickness are to be compensated on the base material side. NOTE The adhesion quality of the cladding should be checked by ultrasonic tes
39、t (UT) prior to welding. No Figure Application Condition Comment 1.1 For fixing on a clad surface (e.g. bearing rings, apex seals) a tpAgreement with purchaser required for low exposure level to stress. BS EN 1708-3:2012EN 1708-3:2012 (E) 7 Table 1 (continued) No Figure Application Condition Comment
40、 1.2 For local introduction of greater strengths (e. g. brackets for flow breakers) a1 tp a2 t2 0,7R 10 mm t2 4 mm f t1, however 20 mm at a minimum BS EN 1708-3:2012EN 1708-3:2012 (E) 8 Table 2 Linings 2 Welds and connections for linings Observe the supplementary design rules according to No 3.1 and
41、 No 3.2 in Table 3. In case of vacuum stresses, the calculation for the bearing capacity of the lining has to be checked separately; thermal stresses is to be taken into account as well. As a rule the lining thickness tlshould be 2 mm as a minimum. When selecting the lining thickness and the weld st
42、rip thickness, the root penetration depth and the welding sensitivity of the carrier material, if applicable, have to be taken into account dependent on the welding procedure and the welds. Cavities between ferritic base metal and austenitic liner shall be avoided for elevated temperature applicatio
43、ns. M is a heterogeneous joint between the ferritic base metal and an austenitic liner V is a homogeneous joint between two austenitic liners. Proceed accordingly with casings. No Figure Application Condition Comment 2.1 tI 3 mm l 3 tl, however 5 mm at a minimum 2.2 tl 3 mm b 20 mm l 3 tl,however 5
44、mm at a minimum 2.3 For a low exposure level to corrosion. Do not remove the excess weld metal tl50 t1 4,0 mm Melt-throughs, even locally limited, are not permissible. The specified minimum wall thicknesses and the thicknesses of butter positions are stipulated in respect of manual metal arc welding
45、 and TIG welding. If other welding processes are to be applied, separate conditions have to be stipulated depending on the case. M is a heterogeneous joint between the ferritic base metal and an austenitic liner. BS EN 1708-3:2012EN 1708-3:2012 (E) 12 Table 3 (continued) No Figure Application Condit
46、ion Comment 3.1 For fixings to austenitic wall t1 4 mm a = 0,5 t11 product side t1tl1tl1see welded connection No. 3.1 tl2 4 mm (finished state) f 3 mm Design supporting welds at the flange connection based on welded connections in compliance with EN 1708-1:2010; Table 2: No. 2.1.8, attached junction
47、s. 4.6 Flange of unalloyed or low-alloyed steel. clad or lined vessel wall c 1 mm a tl/ tptl1see welded connection No. 3.1 tl2= 4 mm (finished state) f 3 mm h = 0,5 t1Fillet weld of thickness a is to be considered only as a corrosion-resistant seal weld. Design supporting welds at the flange connect
48、ion based on welded connections in compliance with EN 1708-1:2010; Table 2: No. 2.1.8; attached junctions. Optional design as in welded connection No. 4.5 possible 4.7 Flange of non alloy steel. Clad or lined vessel wall L 20 mm tl1 2 mm tl2 4 mm (finished state) a tl1tp/ tl 3 mm Design supporting w
49、elds at the flange connection based on welded connections in compliance with EN 1708-1:2010; Table 2: No. 2.1.8; attached junctions. Similar lining also possible on inserted loose flange BS EN 1708-3:2012EN 1708-3:2012 (E) 17 Table 4 (continued) No Figure Application Condition Comment 4.8 With welded Cladding as an option For small, flange made of austenitic steel. Clad vessel wall c 3 mm or designed with butter position a tpV = at least
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