1、September 2007DEUTSCHE NORM English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.160.40!$Q3“146
2、9716www.din.deDDIN 2559-2Preparation of joints for welding Part 2: Matching of inside diameters for circumferential welds onseamless tubesSchweinahtvorbereitung Teil 2: Anpassen der Innendurchmesser fr Rundnhte an nahtlosen RohrenSupersedesDIN 2559-2:1984-02www.beuth.deIn case of doubt, the German-l
3、anguage original should be consulted as the authoritative text.Translation by DIN-Sprachendienst.Document comprises 20 pagesDIN 2559-2:2007-09 2 Contents Page Foreword. 3 1 Scope . 4 2 Normative references . 4 3 Symbols and definitions 4 4 Dimensions 5 4.1 General. 5 4.2 Tolerances. 6 4.3 Calculatin
4、g the matching diameter. 6 5 Joint preparation. 9 Figures Figure 1 Joint preparation as in DIN EN ISO 9692-1, Ref. no. 1.3, matched . 5 Figure 2 Joint preparation as in DIN EN ISO 9692-1, Ref. no. 1.6, matched . 5 Figure 3 Relationship between equations in Table 2 and outside diameters and wall thic
5、knesses in Table 6 7 Tables Table 1 Tolerances for dp6 Table 2 Equations for calculating dpfor tubes with outside diameter as in DIN EN 10216-1:2004-07, Table 6, or DIN EN 10216-2:2004-07, Table 7 . 6 Table 3 Equations for calculating dpfor tubes with inside diameter and wall thickness as in DIN EN
6、10216-2:2004-07, Table 8, or inside diameter and minimum wall thickness as in DIN EN 10216-2:2004-07, Table 10 7 Table 4 Equations for calculating dpfor tubes with outside diameter and minimum wall thickness as in DIN EN 10216-2:2004-07, Table 9 . 8 Tabelle 5 Equations for calculating dpfor tubes or
7、dered cold-finished with outside diameter and wall thickness as in DIN EN 10216-2:2004-07, Table 11 . 8 Table 6 Matching diameter dpas in Table 2 for tubes with outside diameter as in DIN EN 10216-1:2004-07, Table 6, or DIN EN 10216-2:2004-07, Table 7 10 Table 7 Matching diameter dpas in Table 3 for
8、 tubes with outside diameter as in DIN EN 10216-2:2004-07, Table 9 13 Table 8 Matching diameter dpas in Table 6 for cold-finished tubes with outside diameter as in DIN EN 10216-2:2004-07, Table 11 16 Table 9 Minimum allowable wall thickness tpfor tubes with outside diameter as in DIN EN 10216-1:2004
9、-07, Table 6, or as in DIN EN 10216-2:2004-07, Table 7. 19 Table 10 Minimum allowable wall thickness tpfor cold-finished tubes with outside diameter as in DIN EN 10216-2:2004-07, Table 11 20 DIN 2559-2:2007-09 3 Foreword This standard has been prepared by Joint Committee NA 092-00-13 AA Schweien im
10、Anlagen-, Behlter- und Rohrleitungsbau (DVS AG A 3) of the Normenausschuss Schweitechnik NAS (Welding Standards Committee). It is intended to submit this document to CEN/TC 121 “Welding” as a proposal for a European Standard. Amendments This standard differs from DIN 2559-2:1984-02 as follows: a) Di
11、mensions and tolerances have been harmonized with DIN EN 10216-1:2004-07 and DIN EN 10216-2:2004-07. Previous editions DIN 2559-2: 1976-04, 1984-02 DIN 2559-2:2007-09 4 1 Scope This standard specifies matching dimensions for butt joints welded from one side, with joint preparation as in DIN EN ISO 9
12、692-1, for welds on seamless steel tubes having dimensions and tolerances as in DIN EN 10216-1:2004-07, 8.7, or DIN EN 10216-2:2004-07, 8.7. This document helps ensure proper matching of diameters and wall thicknesses without extensive corrections being necessary. This document may also be applied t
13、o other cylindrical hollow bodies, by analogy. 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
14、amendments) applies. DIN EN 10216-1:2004-07, Seamless steel tubes for pressure purposes Technical delivery conditions Part 1: Non-alloy steel tubes with specified room temperature properties DIN EN 10216-2:2004-07, Seamless steel tubes for pressure purposes Technical delivery conditions Part 2: Non
15、alloy and alloy steel tubes with specified elevated temperature properties DIN EN ISO 9692-1, Welding and allied processes Recommendations for joint preparation Part 1: Manual metal-arc welding, gas-shielded metal-arc welding, gas welding, TIG welding and beam welding of steels 3 Symbols and definit
16、ions Because technical delivery standards for tubes do not use uniform symbols for nominal diameter and nominal wall thickness, this standard uses the following symbols as defined below. d inside diameter; dminminimum inside diameter; dpmatching diameter; D outside diameter; Dminimalminimum allowabl
17、e outside diameter, e.g. for tube manufacturing; t wall thickness; tminminimum wall thickness; tccalculated wall thickness; tpminimum allowable wall thickness, e.g. for tube manufacturing. DIN 2559-2:2007-09 5 4 Dimensions 4.1 General Figures 1 and 2 illustrate the matching diameter dpand wall thick
18、ness t of the tube. The following three equations shall be used to calculate dp: For outside diameter tubes use the following equation: dp= Dminimal 2 tpFor inside diameter tubes use the equations below: dp= 1,01 d or dp= 1,02 dminIt is assumed that larger wall thicknesses are selected for inside di
19、ameter tubes to allow for weakening (holes). Where a weakening factor has not been used in calculations, the matching diameter dpshall be selected on the basis of the calculated wall thickness. Figure 1 Joint preparation as in DIN EN ISO 9692-1, Ref. no. 1.3, matched Figure 2 Joint preparation as in
20、 DIN EN ISO 9692-1, Ref. no. 1.6, matched The equations specified in this standard are such that when preparing the matching diameter dpof outside diameter tubes, the wall thickness does not fall below the wall thickness tpfor any tube. The minimum allowable wall thicknesses tpfrom manufacturing are
21、 given in Table 9. For tubes with inside diameters as in DIN EN 10216-2:2004-07, Table 8, the minimum allowable wall thickness is given by subtracting the tolerance from the wall thickness t. For tubes with outside diameters as in DIN EN 10216-2:2004-07, Table 9, the minimum allowable wall thickness
22、 is identical with the minimum wall thickness tmin, given the lower tolerance limit of 0 mm. For tubes with inside diameters as in DIN EN 10216-2:2004-07, Table 10, the minimum allowable wall thickness is identical with the minimum wall thickness tmin, given the lower tolerance limit of 0 mm. Tables
23、 2 to 5 give various equations for calculating the matching diameter dpdepending on the nominal dimension used in the relevant standards (either the nominal outside diameter, nominal inside diameter, or the minimum inside diameter), or whether it is the mean nominal wall thickness or nominal minimum
24、 wall thickness. The values for dpin Tables 6 to 8 are rounded off to the nearest half or whole millimetre. Values calculated for dpin accordance with Table 3 are to be rounded off in the same manner. DIN 2559-2:2007-09 6 4.2 Tolerances Table 1 gives tolerances for the matching diameter dp. Table 1
25、Tolerances for dpDimensions in millimetresdpTolerance 120 0 0,3 120 320 0 1,0 4.3 Calculating the matching diameter The following tables give equations for calculating the matching diameter dp, with each equation numbered. Each table gives the relevant technical delivery standard, the nominal dimens
26、ion used in the relevant standards, and diameter and wall thickness tolerances. Wall thicknesses are not only given in millimetres but are also expressed as the wall thickness/diameter ratio t/D, where necessary. The same conditions in the tables are expressed as the same equations and indicated by
27、a same equation number. The equations for calculating dpgiven in Table 2 are based on the preferred outside diameters and wall thicknesses specified in DIN EN 10216-1:2004-07, Table 5, and DIN EN 10216-2:2004-07, Table 6, and on the outside diameter and wall thickness tolerances specified in DIN EN
28、10216-1:2004-07, Table 6, and DIN EN 10216-2:2004-07, Table 7. Table 2 Equations for calculating dpfor tubes with outside diameter as in DIN EN 10216-1:2004-07, Table 6, or DIN EN 10216-2:2004-07, Table 7 Dimensions in millimetres Outside diameter D Wall thickness t Equation for matching diameter dp
29、 Number of equation 3,2 dp = D 0,5 2 (t 0,4) 1 D 48,3 3,2 dp = D 0,5 1,75 t 2 48,3 219,1 0,1 D dp = 0,99 D 1,8 t 6 The matching diameters calculated and rounded off in accordance with Table 2 are given in Table 6. Some of these values are smaller than the theoretical inside diameter given by the out
30、side diameter and wall thickness; these values are shaded in Table 6. DIN 2559-2:2007-09 7 Figure 3 illustrates the relationship between the equations in Table 2 and the values shown in Table 6. Figure 3 Relationship between equations in Table 2 and outside diameters and wall thicknesses in Table 6
31、The equations given in Table 3 for calculating the matching diameter dpare based on the tolerances on inside diameter d, minimum inside diameter dminand wall thickness t specified in DIN EN 10216-2:2004-07, Table 8, and those on inside diameter d, minimum inside diameter dminand minimum wall thickne
32、ss tmin specified in DIN EN 10216-2:2004-07, Table 10. Table 3 Equations for calculating dpfor tubes with inside diameter and wall thickness as in DIN EN 10216-2:2004-07, Table 8, or inside diameter and minimum wall thickness as in DIN EN 10216-2:2004-07, Table 10 Dimensions in millimetres Inside di
33、ameter d or dmin Wall thickness t or tmin Equationa for matching diameter dpNumber of equation d 220 all wall thicknessesdp= 1,01 d 7 dmin 220all wall thicknessesdp= 1,02 dmin8 aThe calculated values for dpare to be rounded off to the nearest half or whole millimetre.The equations given in Table 4 f
34、or calculating the matching diameter dpare based on the preferred outside diameters D and wall thicknesses t specified in DIN EN 10216-2:2004-07, Table 6, and on the tolerances on outside diameter D and minimum wall thickness tminspecified in DIN EN 10216-2:2004-07, Table 9. DIN 2559-2:2007-09 8 Tab
35、le 4 Equations for calculating dpfor tubes with outside diameter and minimum wall thickness as in DIN EN 10216-2:2004-07, Table 9 Dimensions in millimetres Outside diameter D Minimum wall thicknesstmin Equation for matching diameter dp Number of equation D 48,3 all wall thicknessses dp = D 0,5 2 tmi
36、n9 D 48,3 all wall thicknessses dp = 0,99 D 2 tmin10 The matching diameters calculated and rounded off in accordance with Table 4 are given in Table 7. All of these values are smaller than the theoretical inside diameter given by the outside diameter and minimum wall thickness and are therefore shad
37、ed in Table 7. The equations given in Table 5 for calculating the matching diameter dpfor tubes ordered cold-finished are based on the the preferred outside diameters D and wall thicknesses t specified in DIN EN 10216-2:2004-07, Table 6, and on the tolerances on outside diameter D and wall thickness
38、 t specified in DIN EN 10216-2:2004-07, Table 11. Tabelle 5 Equations for calculating dpfor tubes ordered cold-finished with outside diameter and wall thickness as in DIN EN 10216-2:2004-07, Table 11 Dimensions in millimetres Outside diameter D Wall thickness t Equationafor matching diameter dp Numb
39、er of equation 2,0 dp = D 0,3 2 (t 0,2)11 D 57,0 2,0 dp = D 0,3 1,8 t 12 D 57,0 2,0 dp = 0,995 D 1,8 t 13 aThe calculated values for dpare to be rounded off to the nearest half or whole millimetre. The matching diameters calculated and rounded off in accordance with Table 5 are given in Table 8. Som
40、e of these values are smaller than the theoretical inside diameter given by the outside diameter and wall thickness; these values are shaded in Table 8. The values for the matching diameter dpgiven in Tables 6, 7 and 8 are rounded off to the nearest half or whole millimetre. Values calculated for dp
41、in accordance with Table 3 are to be rounded off in the same manner. DIN 2559-2:2007-09 9 5 Joint preparation The matching diameter can be formed by means of a cutting (machining) or non-cutting (chipless) process. The prepared internal faces should have a smooth transition without projections and a
42、 surface roughness (max. height of the profile) Rz 100 m (Ra 12,5 m). Only tubes having the same matching diameter, with tolerances as in Table 1, may be joined. If matching diameters differ, the decision as to whether the tubes may be welded together shall be determined on the basis of the permissi
43、ble edge offset. When joining tubes having different wall thicknesses, or when joining tubes with different nominal diameters (outside vs. inside), the matching diameter determined on the basis of this standard will be different for each side of the joint. In this case the larger of the two matching
44、 diameters shall be selected, taking into consideration the fact that this is only possible when the resulting wall thickness is not smaller than the minimum allowable wall thickness specified in Table 9. This wall thickness may only be smaller than the minimum allowable wall thickness specified in
45、Table 9 if further calculations show that the remaining wall thickness is within the permissible limits. Working of the internal faces can be dispensed with if the existing inside diameter is dp, although this diameter may be larger than the matching diameter on the other side of the joint. Before w
46、elding, the weldability of the joint shall be established on the basis of the permissible edge offset. If the edge offset conditions are not met, another process shall be chosen, e.g. reducing, deposit welding, or widening. If the inside diameters of a joint to be welded are comparable, it is only n
47、ecessary to match the smaller inside diameter to the larger inside diameter, taking care that the remaining joint wall thickness is greater than the minimum allowable wall thickness tpspecified in Table 9. The wall thickness may only be smaller than the tpvalue specified in Table 9 if further calcul
48、ations show that the remaining wall thickness is within the specified limits. If, when welding tubes having the same nominal dimensions, the inside diameter of one side does not match, this diameter shall be measured again. If the re-measured value is smaller than the matching diameter required for
49、this particular joint, then the measured smaller diameter shall be adjusted to match the larger inside diameter of the other side, taking care that the specifications of Table 9 regarding the minimum allowable wall thickness are met. The adjusted wall thickness may only be smaller than tpas in Table 9 if further calculations show that the remaining wall thickness is within the permissible limits. . DIN 2559-2:2007-09 10 Table 6 Matching diameter dpas in Table 2 f
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