GB 50236-2011 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 50236-2011 | English | 125 |
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Code for construction of field equipment, industrial pipe welding engineering
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| GB 50236-1998 | English | 1899 |
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Code for construction and acceptance of field equipment, industrial pipe welding engineering
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GB 50236-2011: Code for construction of field equipment, industrial pipe welding engineering---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50236-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50236-2011
Code for Construction of Field Equipment,
Industrial Pipe Welding Engineering
Issued on. FEBRUARY 18, 2011
Implemented on. OCTOBER 1, 2011
Jointly Issued by. Ministry of Housing and Urban-Rural Development of the
People's Republic of China;
General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China
National Standard of the People's Republic of China
Code for Construction of Field Equipment,
Industrial Pipe Welding Engineering
Chief Development Department.
Branch of Chemical Industry, China Association for Engineering
Construction Standardization
Approval Department.
Ministry of Housing and Urban-Rural Development of the People's
Republic of China
Implementation Date.
October 01, 2011
China Planning Press
2010 Beijing
Table of Contents
Forward... 4
1 General Provisions... 7
2 Terms... 8
3 Basic Requirements... 9
4 Materials... 11
5 Welding Procedure Qualification... 14
6 Welding Skill Qualification... 15
7 Welding of Carbon Steel and Alloy Steel... 19
8 Welding of Aluminium and Aluminium Alloy... 28
9 Welding of Copper and Copper Alloy... 32
10 Welding of Titanium and Titanium Alloy... 35
11 Welding of Nickel and Nickel Alloy... 38
12 Welding of Zirconium and Zirconium Alloy... 41
13.1 Inspection before Welding... 44
13.2 Inspection in the Mid of Welding... 44
13.3 Inspection after Welding... 45
13.4 Hand over of Welding Engineering... 47
Appendix A Welding Procedure Specification Form... 49
Appendix B Welding Performance Qualification Record, Welding Performance
Qualification Result Form and Welding Performance Certification Form... 52
Appendix C Type and Size of Welding Groove for Common Use... 56
Appendix D Selection of Welding Materials... 67
Explanation of Wording in This Code... 73
List of Quoted Standards... 74
1 General Provisions
1.0.1 This Code was formulated with a view to improving the construction level of welding
engineering for equipment in construction site of engineering construction and the industrial
metallic pipeline, strengthening the quality control in construction process of welding
engineering, and guaranteeing the engineering quality and engineering safety.
1.0.2 This Code is applicable to the welding engineering construction of the materials
made of carbon steel, aluminium and aluminium alloy, copper and copper alloy, titanium and
titanium alloy (low alloy titanium), nickel and nickel alloy as well as zirconium and
zirconium alloy.
1.0.3 The welding methods applicable to this Code include gas welding, shielded metal arc
welding, submerged arc welding, tungsten inert gas arc welding, metal inert gas arc welding,
self-shielded flux cored arc welding, electroslag welding and stud welding.
1.0.4 The welding engineering construction shall be carried out according to the
requirements of the design document and this Code.
1.0.5 Where the design document needs be modified or the material needs be substituted, it
shall be approved by the original design organization and issued with written document.
1.0.6 This Code shall apply in conjunction with the current national standard "Code for
Construction and Acceptance of Field Equipment, Industrial Pipe Welding Engineering" (GB
50683).
1.0.7 The welding engineering construction shall meet the relevant requirements of the
relevant current national standards on energy conservation and emission reduction,
environmental protection, safety technology as well as labour protection, etc.
1.0.8 The construction of field equipment, industrial pipe welding engineering shall not
only in accordance with this Code, but also comply with the requirements specified in the
current relevant standards of the nation.
2 Terms
2.0.1 Field equipment
It refers to the equipment manufactured or installed in construction site of engineering
construction.
2.0.2 Welding responsible personnel
The personnel obtaining the required professional knowledge of welding by training,
education or practice, being qualified with his capacity and designated to take responsibility
of welding and relevant manufacture activities.
2.0.4 Welding procedure pre-specification
The welding procedure specification in need of qualification.
2.0.5 Welding procedure qualification
The process of preparing test piece and test specimen, conducting the test and assessing
the result according to welding procedure pre-specification.
2.0.6 Welding procedure qualification report
The document recording the relevant test data and test result during the process of
welding procedure qualification.
3 Basic Requirements
3.0.1 The requirements of welding technical specification shall be specified in design
document.
3.0.2 The qualifications and responsibilities of welding responsible personnel and welding
operation personnel shall meet the following requirements.
3.0.3 The supervision organization and general contracting organization shall be equipped
with welding responsible personnel.
3.0.4 The construction organization shall meet the following conditions.
3.0.7 Before the welding for the engineering is conducted, the fixtures for welding and heat
treatment shall be inspected and calibrated, their operating performance shall be confirmed to
be stable and secure. The measuring instruments and equipment for inspection and test shall
be in validity period for verification or calibration.
4 Materials
4.0.1 The base metal adopted in welding engineering shall be provided with quality proof
documents of manufactory and shall meet the requirements of the current national standard
and design document.
4.0.3 The welding materials shall meet the requirements of design document and those
specified as follows.
4.0.5 The construction site shall be set with systems of welding materials for preservation,
stoving, washing, distributing, application and recycling. The management of the storage site,
stoving and decontaminating facilities as well as the management during storage keeping and
application of welding materials shall meet the requirements of the current professional
standard "Rules of Quality Management of Welding Materials" (JB/T 3223).
5 Welding Procedure Qualification
5.0.1 After mastering the welding performance, the welding procedure qualification
must be carried out before engineering welding.
5.0.5 The procedure measures for welding procedure qualification of test piece on groove
processing, fitting up and cleaning shall meet the requirements of relevant chapters in this
Code.
5.0.7 The welding procedure qualification shall be carried out in the company of itself. The
test pieces for welding procedure qualification shall be welded by skilled welders in the
company. Inspection and test may be entrusted to the organization engaged in inspection and
test with corresponding qualification.
5.0.8 Records shall be made in good condition during the welding procedure qualification.
After the qualification is finished, a welding procedure qualification report shall be prepared,
which shall be examined and verified by the welding technical director.
5.0.9 Welding procedure pre-specification, welding procedure qualification report,
inspection and test report, qualification test specimen and other documents shall be filed for
preservation.
6 Welding Skill Qualification
6.0.1 The welding skill qualification shall be organized and implemented by the welding
skill qualification committee of the company. In case that the company fails to establish the
welding skill qualification committee, qualified company shall be entrusted to organize the
examination.
6.0.2 The welding skill qualification committee of the company shall meet the following
conditions.
6.0.4 The welder applying to participate in the welding skill qualification shall have
education background of middle school or above, the welder's body is in condition that is able
to meet the requirement of the operation items included in the applied examination, and the
welder shall be competent in welding work independently after safety education and
professional training and shall take the examination after being approved by the welding skill
qualification committee.
6.0.7 When certificate holding welders need to take additional examination for items of the
same welding method, they can be exempted from the elementary knowledge examination.
When the material type of additional item and welding method are changed, they shall take
additional examination of elementary knowledge for corresponding material type and welding
method.
6.0.12 Welders who have been qualified by welding skill qualification according to other
relevant standards shall not perform the welding work in the applicable scope of this Code
until they are approved by the responsible engineer on welding of the construction
organization, and the approved items shall conform to the requirements of this chapter.
6.0.13 The welding skill qualification record, the registration form for welding skill
qualification result and the quality certificate should take the format as stated in Appendix B
of this Code. The items in the welding operating skill qualification shall be expressed in codes
which shall meet the requirements of the special equipment safety technical regulation
"Examination Rules for Welding Operators of Special Equipment" (TSG Z6002) specified by
AQSIQ.
7 Welding of Carbon Steel and Alloy Steel
7.1 General Requirements
7.1.1 This chapter is applicable to the welding construction for the field equipment and
pipeline made of carbon steel and alloy steel with a carbon content less than or equal to
0.30%.
7.2 Preparation before Welding
7.2.1 The cutting and groove processing of weldment shall meet the following
requirements.
7.2.2 Before the fitting up and welding of the weldment, the groove and its internal and
external and lateral surface within the range of no less than 20mm shall be cleaned up of
impurities, dirt, burrs and zinc coatings without such defects as cracks and interlayers.
7.2.3 Except of the pipelines subject to cold drawing or cold reducing as specified by the
design, the weldment shall not be forced to fit up.
7.2.9 Where the partial clearance of weldment fitting up is oversize, it shall be repaired and
adjusted to the specified dimension in stead of adding stemming into the clearance.
7.2.10 The welded parts shall be cushioned firmly when the weldments are fit up, and
measures shall be taken to avoid subsidiary stress and deformation in welding and heat
treatment process.
7.2.11 The weld by butting groove with steel backing plate on its back, the backing plate
and the base metal shall be adhered tightly.
7.2.12 Both ends of the longitudinal butt weld should be arranged with run on plate and run
off plate, their material should be the same with the base metal or in the same type.
7.3 Requirements of Welding Procedure
7.3.15 The austenitic stainless steel weld, duplex stainless steel weld and the surface of
surrounding area shall be subject to pickling and passivation in accordance with the design.
7.3.16 The stud welding shall meet the following requirements.
7.4 Weld Preheating and Post-weld Heat Treatment
7.4.1 The weld preheating and post weld heat treatment shall be conducted with a
comprehensive consideration of hardenability, weldment thickness, structure rigidity, welding
method, welding environment and service condition of the steel. The requirements of the weld
preheating and the post-weld heat treatment shall be specified in welding procedure document
and verified by welding procedure qualification.
7.4.2 The weld preheating shall meet the requirements of design document. The minimum
preheating temperature of common steel grade shall be in accordance with those specified in
Table 7.4.2.
8 Welding of Aluminium and Aluminium Alloy
8.1 General Requirements
8.1.1 This chapter is applicable to the welding construction of field equipment and pipeline
made of commercial purity aluminium and aluminum alloy.
8.1.2 This chapter is applicable to tungsten inert gas arc welding and metal inert gas arc
welding.
8.2 Preparation before Welding
8.2.1 The welding wire shall be selected by taking comprehensive consideration of base
metal chemical components, mechanical properties and service conditions, etc., and the
following requirements shall be met.
8.2.2 The preparation of the weldment groove shall meet the following requirements.
8.3 Requirements of Welding Procedure
8.3.1 The AC power supply shall be adopted for tungsten inert gas arc welding, and the DC
power supply shall be adopted for metal inert gas arc welding, the welding wire shall be
connected to the positive pole.
8.3.2 A trial welding shall be conducted on the test plate before welding, and the formal
welding shall not be carried out until the procedure parameter is adjusted in good condition
and the weld is confirmed without air hole.
8.3.11 In case of pollution or irregular shape at the front end of tungsten electrode of
tungsten inert gas arc welding, the tungsten electrode shall be revised and replaced. Where the
weld contacts the tungsten, the welding shall not be continued until the tungsten electrode,
welding wire and molten pool are cleaned.
8.3.12 Where the current contact nozzle and spray nozzle are fused into the weld during
metal inert gas arc welding, the welding shall not be before shoveling the weld at the fused
part as well as replacing the current contact nozzle and spray nozzle.
9 Welding of Copper and Copper Alloy
9.1 General Requirements
9.1.1 This chapter is applicable to the welding construction of equipment and pipelines
made of pure copper and brass.
9.1.2 This chapter is applicable to the tungsten inert gas arc welding for pure copper and
brass and the oxyacetylene welding for brass.
9.2 Preparation before Welding
9.2.1 The selection of welding materials shall meet the following requirements.
9.2.4 When the butt welds of pipelines are fit up, the internal wall misalignment shall not
exceed 10% of base metal thickness and shall not be greater than 1mm. Opening should be
conducted at the edge of the weld, if the opening is necessary, it shall meet the requirements
of Article 13.3.6 in this Code.
9.3 Requirements of Welding Procedure
9.3.1 When the tack weld is welded, the welding materials and welding procedure shall be
adopted as the same with those required for formal welding, and the welding shall be
conducted by qualified welder. In case of any crack, air hole and other defects on the tack
weld, they shall be cleared off for re-welding.
9.3.2 Where the joint is welded by adopting single side welding, the measure as adding
backing plate at its back shall be taken.
9.3.7 Measures shall be taken to avoid welding deformation and to reduce the welding
residual stress. The hammering in hot state or cold state may be carried out to the weld and
heat affected area after welding.
9.3.8 The post-weld heat treatment for brass shall meet the following requirements.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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