Chinese standards (related to): 'GB/T 40801-2021'
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Welding procedure qualification tests for titanium,zirconium and their alloys
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GB/T 40801-2021
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GBT 40801-2021
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| Standard ID | GB/T 40801-2021 (GB/T40801-2021) | | Description (Translated English) | Welding procedure qualification tests for titanium,zirconium and their alloys | | Sector / Industry | National Standard (Recommended) | | Word Count Estimation | 24,264 | | Date of Issue | 2021-10-11 | | Date of Implementation | 2021-10-11 |
GB/T 40801-2021: PDF in English (GBT 40801-2021)
GB/T 40801-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.160.10
CCS J 33
Welding Procedure Qualification Tests for Titanium,
Zirconium and Their Alloys
(ISO 15614-5:2004, Specification and Qualification of Welding Procedures for
Metallic Materials – Welding Procedure Test – Part 5: Arc Welding of
Titanium, Zirconium and Their Alloys, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: OCTOBER 11, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 Pre-Welding Procedure Specification (pWPS) ... 8
5 Evaluation Test of Welding Process ... 8
6 Test Piece ... 8
6.1 General ... 8
6.2 Shape and size of test pieces ... 9
6.2.1 General ... 9
6.2.2 Full penetration plate butt welds ... 9
6.2.3 Full penetration pipe butt welds ... 10
6.2.4 T-joints ... 10
6.2.5 Branch pipe connection ... 11
6.3 Welding of test pieces ... 12
7 Test and Inspection ... 12
7.1 Test content ... 12
7.2 Sampling location of specimen ... 13
7.3 Non-destructive testing ... 16
7.4 Destructive test ... 16
7.4.1 General ... 16
7.4.2 Transverse tensile test ... 16
7.4.3 Bending test ... 17
7.4.4 Macrostructure/microstructure metallography test ... 18
7.5 Qualification level ... 18
7.6 Color and luster ... 18
7.7 Retest ... 18
8 Approval Range ... 19
8.1 Overview ... 19
8.2 Conditions related to the manufacturer ... 19
8.3 Conditions related to materials ... 19
8.3.1 Mother metal group ... 19
8.3.2 Mother metal thickness and tube diameter ... 20
8.3.3 angle of branch pipe ... 21
8.4 General of welding process ... 22
8.4.1 Welding method ... 22
8.4.2 Welding location ... 22
8.4.3 Types of joints ... 22
8.4.4 Welding materials and models ... 23
8.4.5 Type of current ... 23
8.4.6 Inter-pass temperature ... 23
8.4.7 Post-weld heat treatment ... 23
8.4.8 Back gas protection ... 23
8.4.9 Welding with protective chamber ... 23
8.5 Special requirements for different welding methods ... 23
8.5.1 Metal inert-gas arc welding ... 23
8.5.2 Tungsten Inert gas arc welding ... 24
8.5.3 Plasma arc welding ... 24
9 Welding Procedure Qualification Report (WPQR) ... 24
Appendix A (Informative) Guide to Classification of Titanium, Zirconium and Their
Alloys Materials ... 25
Appendix B (Informative) Format of Welding Procedure Qualification Report (WPQR)
... 26
Appendix C (Informative) Correspondence of EN Documents and ISO Documents in
ISO 15614-5:2004 ... 30
Bibliography ... 31
Welding Procedure Qualification Tests for Titanium,
Zirconium and Their Alloys
1 Scope
This Document specifies the test methods and requirements for welding procedure evaluation
for titanium, zirconium and their alloys.
This Document applies to welding procedure evaluation for arc welding of titanium, zirconium
and their alloys (metal inert-gas welding, tungsten inert gas welding, and plasma arc welding).
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 2651 Tensile Test Method on Welded Joints (GB/T 2651-2008, ISO 4136:2001, IDT)
GB/T 2653 Bend Test Methods on Welded Joints (GB/T 2653-2008, ISO 5173:2000, IDT)
GB/T 3323.1 Non-Destructive Testing of Welds - Radiographic Testing - Part 1: X- and
Gamma- Ray Techniques with Film (GB/T 3323.1-2019, ISO 17636-1:2013, MOD)
GB/T 3323.2 Non-Destructive Testing of Welds - Radiographic Testing - Part 2: X- and
Gamma- Ray Techniques with Digital Detectors (GB/T 3323.2-2019, ISO 17636-2:2013,
MOD)
GB/T 16672 Welds-Working Positions-Definitions of Angles of Slope and Rotation (GB/T
16672-1996, ISO 6947:1990, IDT)
GB/T 18851.1 Non-Destructive Testing - Penetrant Testing - Part 1: General Principles
(GB/T 18851.1-2012, ISO 3452-1:2008, IDT)
GB/T 19805 Qualification Test of Welding Operators (GB/T 19805-2005, ISO 14732:1998,
IDT)
GB/T 19866 Specification and Qualification of Welding Procedures for Metallic Materials
- General Rules (GB/T 19866-2005, ISO 15607:2003, IDT)
GB/T 19867.1 Welding Procedure Specification for Arc Welding (GB/T 19867.1-2005,
ISO 15609-1:2004, IDT)
GB/T 19868.4 Welding Procedure Qualification Based on Pre-Production Welding Test
(GB/T 19868.4-2005, ISO 15613:2004, IDT)
GB/T 26955 Destructive Tests on Welds in Metallic Materials - Macroscopic and
Microscopic Examination of Welds (GB/T 26955-2011, ISO 17639:2003, MOD)
GB/T 32259 Non-Destructive Testing of Welds - Visual Testing of Fusion-Welded Joints
(GB/T 32259-2015, ISO 17637:2003, MOD)
GB/T 36234 Qualification Testing of Welders for Fusion Welding on Titanium and
Titanium Alloys, Zirconium and Zirconium Alloys (GB/T 36234-2018, ISO 9606-5:2000,
MOD)
GB/T 39255 Gases and Gas Mixtures for Welding and Cutting Processes (GB/T 39255-
2020, ISO 14175:2008, MOD)
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 19866 apply.
4 Pre-Welding Procedure Specification (pWPS)
The pre-welding procedure specification shall be formulated according to GB/T 19867.1.
5 Evaluation Test of Welding Process
Welding and testing of test pieces shall comply with the provisions of Clauses 6 and 7 of this
Document.
On the premise that the relevant test requirements are met, the welder or welding operator who
has passed the welding procedure qualification test in accordance with this Document shall
obtain the qualification for the corresponding scope of GB/T 36234 or GB/T 19805.
6 Test Piece
6.1 General
The test piece shall be a standard test piece; and its processing shall comply with the relevant
provisions of 6.2. The welding process used in the preparation of the test piece shall be
consistent with the pre-welding process specification and be representative of actual production.
When the standard test piece is not applicable, the pre-production welding test piece shall be
For pipes with an outer diameter greater than 50mm, the reinforcement on the inner and outer
surfaces of the pipe shall be removed so that the thickness of the specimen is the same as that
of the pipe wall.
For pipes with an outer diameter less than or equal to 50mm, when taking the overall sampling
by a small pipe, the reinforcement on the inner surface of the pipe may be retained.
Unless otherwise specified, the tensile strength of the specimen shall be no lower than the lower
limit of the relevant mother metal.
The tensile strength of dissimilar material joints shall be no lower than the lower limit of the
lower mother metal.
7.4.3 Bending test
Bending specimens and tests of butt joints shall comply with the provisions of GB/T 2653.
When the thickness is less than 12mm, two normal bend and root bend specimens shall be made,
respectively. When the thickness is greater than or equal to 12 mm, it is recommended to make
4 side bending specimens instead of the normal bend and root bend specimens.
For butt joints of dissimilar metals or dissimilar materials, two longitudinal bend specimens
(one normal bend and root bend) may be used instead of four transverse bend specimens.
Except for Group 51 materials, which shall adopt be 4t, the bend diameter (or drum diameter)
of other materials shall be 6t during the bending test. When the mother metal elongation A ≥
20%, the bending angle is 180°. When the mother metal elongation A < 20%, the following
Formula shall be used:
Where:
d – bend diameter or drum diameter;
ts – thickness of bend specimen;
A – minimum elongation specified by the material specification.
The specimen shall be bent evenly during the test; and the weld, heat-affected zone and mother
metal shall be evenly attached to the bending surface of the bending tool.
During the test, the specimen shall not have cracks larger than 3mm in any direction; and the
cracks in the corners of the specimen shall be ignored during the evaluation.
7.4.4 Macrostructure/microstructure metallography test
The specimen shall be prepared according to the provisions of GB/T 26955 and etched on one
side to clearly show the fusion line, the heat affected zone and the weld bead of each layer.
Macrostructure metallography test shall include unaffected mother metal; and at least one
macrostructure metallography record shall be made for each process test.
The qualification levels specified in 7.5 shall be used.
Care shall be taken to avoid crack-like indications when eroding certain alloys.
7.5 Qualification level
If the defect in the test piece is within the range of the Level-B limit specified in GB/T 19418,
the welding process is judged to be qualified (except for the following defect type......
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