NB/T 47014-2023 English PDF (NB/T47014-2023)

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NB/T 47014-2023: Welding procedure qualification for pressure equipments
NB/T 47014-2023
NB
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 25.160.10
CCS J 33
Replacing NB/T 47014-2011
Welding procedure qualification for pressure equipments
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JUNE 28, 2024
Issued by: National Energy Administration
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 10
4 General ... 14
5 Welding procedure qualification factors and classification ... 14
6 Welding procedure qualification for butt welds and fillet welds ... 41
7 Qualification of corrosion resistant cladding procedure ... 64
8 Others ... 74
Appendix A (Informative) Welding procedure specification flow chart ... 75
Appendix B (Normative) Supplementary provisions for base materials, filler metals,
welding methods ... 76
Appendix C (Normative) Welding procedure qualification of butt welds with buttering
... 79
Appendix D (Normative) Welding procedure qualification of stainless steel-steel
composite plates ... 81
Appendix E (Normative) Welding procedure qualification of heat exchange tubes and
tube sheets ... 84
Appendix F (Normative) Stud arc welding procedure qualification ... 89
Appendix G (Informative) Recommended format for welding procedure qualification
record ... 95
Appendix H (Informative) Common English abbreviations and codes for welding
procedure qualification ... 105
Welding procedure qualification for pressure equipments
1 Scope
This document specifies the rules, test methods, qualified indicators for welding
procedure qualification for pressure equipment (boilers, pressure vessels, pressure
pipes).
This document is applicable to welding procedure qualification for welding methods
such as gas welding, arc welding, submerged arc welding, gas tungsten arc welding,
gas metal arc welding (including flux-cored arc welding), electroslag welding, plasma
arc welding, friction welding, electrogas welding, stud arc welding, electron beam
welding.
This document is not applicable to welding procedure qualification for gas cylinders.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for referenced documents with
dates, only the version corresponding to that date applies to this document; for
referenced documents without dates, the latest version (including all amendments)
applies to this document.
GB/T 150.2 Pressure vessels - Part 2: Materials
GB/T 151 Heat exchangers
GB/T 228 (all parts) Metallic materials - Tensile testing
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 711 Hot-rolled quality carbon structural steel plates sheets and strips
GB/T 713 Steel plates for boilers and pressure vessels
GB/T 1176 Casting copper and copper alloys
GB/T 1527 Drawn tube of copper and copper alloys
strip surfacing. The calculation formula is: 60×I×U/(V × bandwidth) (J/mm2).
3.22
Buttering
Before the joint is prepared for final welding, pre-welding is performed on one or
two groove surfaces of the joint to increase material, in order to provide a suitable
transition layer weld for subsequent welding.
4 General
4.1 In addition to complying with the provisions of this document, the welding
procedure qualification of pressure equipment shall also comply with the requirements
of relevant standards and technical documents for boilers, pressure vessels, pressure
piping products.
4.2 The general process of welding procedure qualification is: According to the
weldability of metal materials and welding materials, formulate preliminary welding
procedure specifications according to the provisions of design documents and
manufacturing process; prepare test coupons; prepare specimens; detect whether the
welding joints or corrosion-resistant cladding layers meet the specified requirements;
form a welding procedure qualification record to evaluate pWPS.
4.3 Welding procedure qualification shall be carried out in the organization. The
equipment and instruments used for welding procedure qualification shall be in normal
working condition; the metal materials and welding materials shall meet the
corresponding standards; the welding personnel with skilled operation skills in the
organization shall use the equipment of the organization to weld the test coupons.
4.4 The qualified welding procedure refers to the general welding procedure
qualification factors listed in the qualified welding procedure qualification record, the
important factors and supplementary factors in the special welding procedure
qualification factors for butt welds and fillet welds, or the re-evaluated process factors
in the corrosion-resistant cladding process qualification factors.
4.5 See Appendix A for the welding procedure qualification flow chart.
5 Welding procedure qualification factors and classification
5.1 General welding procedure qualification factors and classification for various
welding methods
5.1.1 Welding methods and classification
6 Welding procedure qualification for butt welds and fillet
welds
6.1 General qualification rules for various welding methods
6.1.1 Qualification rules for welding methods
When the welding method is changed, the welding procedure qualification needs to be
re-performed.
6.1.2 Qualification rules for base materials
6.1.2.1 Qualification rules for categories (except stud welding and friction welding):
a) When the base material category number is changed, so the welding procedure
qualification needs to be re-performed;
b)For welding of a certain category of base materials Fe-1 ~ Fe-5A, qualified
welding procedures such as arc welding, submerged arc welding, gas shielded arc
welding, gas tungsten shielded welding, plasma arc welding with wire are
applicable to welding of the base materials of this category with the base materials
of lower category;
c) Except for b), for welding of base materials of different categories, even if the
welding procedure of each base material is qualified, the welding joint still needs
to be re-qualified;
d) When the heat affected zone specifies impact, the preliminary welding procedures
for welding of two categories (groups) of base materials are the same as the
welding procedure for their respective qualified welding, then the welding of
these two categories (groups) of base materials does not need to be re-qualified.
6.1.2.2 Group qualification rules (except stud welding and friction welding):
a) Except for the following provisions, when the base material group number
changes, the welding procedure qualification needs to be re-performed;
b) The welding procedure that has been qualified for a base material is applicable to
other base materials of the same group number;
c) In the same category number, the welding procedure that has been qualified for a
base material of a higher group number is applicable to the welding of the base
material of the higher group number with the base material of the lower group
number;
d) The welding procedure that has been qualified for a base material of the Fe-1-2
group number is applicable to the base material of the Fe-1-1 group number.
6.1.2.3 Base material qualification rules for friction welding:
a) When the nominal composition or tensile strength grade of the base material
changes, t...