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I-1 Scope
This section on filler metal selection is provided as a consideration when other directions or specifications are not provided.
I-2 Use of Filler Metal Tables
To use the Filler Metal Selection Tables I.1-I.3, locate the row of the first base metal to be joined and the column of the second base metal to be joined. The intersect of the column and row gives the recommended Filler Metal Column to be used for that base metal combination. If the box is on the top-right half of the table, switch the column and row as only half of the table is filled in to prevent duplication. If no filler metal is listed for a particular combination, contact MPE to determine correct filler metal.
I-3 Use of Filler Metal Columns
Once a Filler Metal Column is determined from Tables I.1 through I.3, use Table I.4 to determine the acceptable filler metals for that Column.
Unless the process is specified on the engineering drawing, Weld Filler Metals in the same Column may be used interchangeably provided that (1) there is a qualified
procedure for that class of filler and process, (2) the electrode and process are suitable for use in the intended welding position and within any limitations imposed on joint accessibility by component configuration, and (3) consideration has been given to the advisability of use of low carbon version of electrodes to avoid intergranular carbide precipitation and reduced weld corrosion resistance, or to avoid lower weld creep and rupture strength that may result from use of the low carbon versions. MPE shall be consulted regarding the details of items (2) and (3).
ASME
ASME No. P8 P8 P8 P8 P8 P8
BASE METAL WELDED TO 304 304L 309, 309S, 310 316 316L 321, 347
P15E Grade 91 BT BT BT BT BT
P8 304 AE
P8 304L AE-L
P8 309, 309S, 310 AE AE-L AU/AF
P8 316 AH AH-L AH
P8 316L AH-L AH-L AH-L
P8 321, 347 AE-L AE-L BE
P43 Inconel 625 BI
- X40, X45, FSX-414 BH BH
ASME No. P42 P43 P43 - P43 P45
Code NOTES GE Spec Industry Spec
ASTM/ASME Classification
ASME F-No.
UNS No.
Trade Name
AA
B21B10A A5.1 E6010 3
B21B10B A5.1 E6020 1
B21B10D A5.1 E6013 2
B21B40A2 A5.1 E7016 4
B21B89A A5.1 E6027 1
B21B81A A5.1 E7018 4
None A5.1 E7018-1 4
None A5.17 F6A2-EL8K 6
None A5.17 F6A2-EL12 6
None A5.17 F7A2-EM12K 6
None A5.17 F7A2-EM13K 6
B50A631B,C A5.20 E70T-1 6
B50A631D,E A5.20 E71T-1 6
B21B126C1 A5.20 E70T-4 6
B21B126C2 A5.20 E70T-G 6
None A5.20 E70T-6 6
B21B90B A5.18 ER70S-2 6
B21B60 A5.18 ER70S-3 6
None A5.18 ER70S-4 6
B21B90D A5.18 ER70S-6 6
Code NOTES GE Spec Industry
Code NOTES GE Spec Industry
Code NOTES GE Spec Industry Spec ASTM/ASME
Classification ASME F-No. UNS No. Trade Name
AL
AQ B50A485 AMS 5795BM Multimet N-155
None AMS 5794A Multimet N-155
AR obsolete
Code NOTES GE Spec Industry Spec ASTM/ASME Classification ASME F-No. UNS No. Trade Name
AMS 5786/5787 ERNiMo-3/ENiMo-3 44 N10004 Hastelloy W
NOTE 1 Weldments between 410 and Cr-Mo steels should be limited to applications where the operating temperature is below 950F (510 C).
NOTE 2 For FCAW electrodes, “X” may be 0 or 1, and “Y” may be 1 or 4 as appropriate for the qualified welding procedure.
NOTE 3 See the section titled Dissimilar Metal Welds in this specification.
NOTE 4 Haynes 556 is prone to microfissuring. The filler metal listed in Col BI or Col BL are much less prone to objectionable microfissuring.
NOTE 5 E9015-B9 is recommended over the E9016-B9 and E9018-B9, as it doesn't contain iron powder and so eliminates one source of contaminates.
NOTE 6 EPRI P87 is available from Euroweld. EPRI P87 is preferable to Hastelloy W because there is test data from EPRI for the P87 that is specific to dissimilar metal weld
applications. Hastelloy W chromium content is similar to EPRI P87, but it has not been tested for viability as a dissimilar metal weld.
PREFERRED WELD JOINT DESIGNS FOR PIPING WELDS
II.1 If a preferred weld preparation does not suit the required application, the weld preparation shall be described by the weld symbol.
II.2 Allowable tolerances on angles for weld preparation is + 2-1/2 unless otherwise stated.
II.3 Fig. P8 is special socket weld for fuel nozzle application; use on piping components is considerd a deviation from standard practice. Use of it requires the responsible Design Engineering organization’s approval.
II.4 Backing rings are not allowed (Fig. P2).
II.5 Sleeve fabrications are not allowed (Fig. P3).
Joint Alignment Tolerances for Open Root Butt Welds1
B = 30° max G = 3/32 inch min to 5/32 inch max
D = 2 times offset O, min O = 1/16 inch max
E = Not to exceed amount permitted by W W = not less than minimum design thickness
F = Not less than 4 times E
1) B31.3, Fig. 328.4.3
Unreinforced Branch Attachment Welds
Fig - P12 Fig. - P13
Tb = Nominal Thickness, Branch.
tc = Throat Thickness, the lesser of 0.7Tb or 0.25 in (6mm) Th = Nominal Thickness, Header
NOTE: These sketches show minimum acceptable welds. Welds may be larger than shown here.
Integrally Reinforced Branch Outlet Fitting
Tb = Nominal Thickness, Branch.
tc = Throat Thickness, the lesser of 0.7Tb or 0.25 in (6mm) Th = Nominal Thickness, Header
W = Weld leg, the lessor of 1.4 tc or 0.35 in ( 9mm), but not less than 0.19 in (4.8mm)
Note 1: Inert gas backing required.
Note 2: Transverse Section, blend weld in to pipe, No undercuts permitted.
The fillet size is determined base on leg not throat. The branch fillet weld must fill and match with as smooth rransition to the fully
penetrated weld matching the specific fitting.
Note 3: Refer to Figure P14.1 and P14.2 below for additional requirements and a weld pass example.
Note 4: Interpass temperature limits must be strictly followed.
Branch Outlet and Weld Pass Sequence
TYPICAL FABRICATED LAPS
c = Sum of mechanical allowances + corrosion or erosion allowances.
╤
= Normal Thickness, T2 = Lap ThicknessLaps shall be machined (front and back) or trued after welding. Plate flanges or lap joint flanges per ASME B16.5 may be used. Welds may be machined to radius, as in Fig.
P19, if necessary to match B16.5 lap joint flanges.
Fig. P19
ADDITIONAL REQUIREMENTS IN CONFORMANCE WITH DIRECTIVE 97/23/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL OF 29 May 1997 ON THE
APPROXIMATION OF THE LAWS OF THE MEMBER STATES CONCERNING PRESSURE EQUIPMENT.
1. Scope
Where Directive 97/23/EC is specifically noted in the purchase agreement or on the face of design documentation, these additional requirements shall also be met.
2. Applicable Documents
Directive of European Parliament concerning pressure equipment.
Directive 97/23/EC of the European parliament and the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment.
3. Qualification Requirements
3.1 Welding Procedure Qualification
In addition to the requirements set forth in Paragraphs 5.1 and 5.2 of this
specification, the following requirements shall also apply to qualify a procedure for fabricating the components that are defined in Para. 1.1.3.
3.1.1 Welding Procedure Specification (WPS) and the Procedure Qualification Report (PQR) shall conform to the requirements of European Standard EN288.
3.1.2 For pressure equipment in categories II, III and IV, welding procedures must be approved by a competent third party, i.e., notified body or a third-party
organization recognized by a EU Member State, at the manufacturer’s discretion.
3.1.3 The third party must perform examinations and tests as set out in the appropriate harmonized standards or equivalent examinations and tests or must have them performed. This requires a certificate to be provided to indicate that test coupons were welded in the presence of the third party. Testing is to be done per EN 288 requirements. In addition, the third party must witness the testing of the weld specimens. The latter may be waived if the specimens are tested by a laboratory with ISO EN 17025 certification or equivalent (in the USA, A2LA accreditation.)."
Section 6 of this specification, the following requirements shall also apply to qualify welders for fabricating the components that are defined in Para. 1.1.2.
3.2.1 All welders shall be qualified in conformance with EN287.
3.2.2 For pressure equipment in categories II, III and IV, welding personnel must be approved by a competent third party, i.e., notified body or a third-party
organization recognized by an EU Member State, at the manufacturer’s discretion.
3.2.3 Welder approval tests must be carried out in the presence of the third party.
Specimen tests are to be done in accordance with the ASME B&PVC Section IX and EN 287. In addition, the third party must witness the testing of the weld specimens. The latter may be waived if the specimens are tested by a
laboratory with ISO EN 17025 certification or equivalent (in the USA, A2LA accreditation.)."
3.2.4 Welders' Approval Certificates from the third party will be provided for all welders approved for Pressure Equipment Directive Categories II, III and IV applications.
4. Document Retention
Technical documentation (of which welding procedure and welder approval documents are a part) shall be kept for a period of ten years following completion of fabrication.
5. Inspection/Test Procedures and Requirements
For pressure equipment, non-destructive tests of permanent joints must be carried out by suitable qualified personnel. For pressure equipment in categories III and IV, the
personnel must be approved by a third-party organization recognized by a Member State.
In addition, technical documentation (of which NDE test procedure and NDE personnel approval records are a part) shall be kept for a period of ten years following completion of fabrication.