GB 50661-2011 PDF English
US$145.00 · In stock · Download in 9 secondsGB 50661-2011: Code for welding of steel structures Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 50661-2011 | English | 145 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Code for welding of steel structures
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB 50661-2011
GB 50661-2011: Code for welding of steel structures---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/GB50661-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50661-2011
Code for Welding of Steel Structures
Issued on. DECEMBER 5, 2011
Implemented on. AUGUST 1, 2012
Issued by. Ministry of Housing and Urban-Rural Development;
General Administration of Quality Supervision, Inspection
and Quarantine (AQSIQ) and the Standardization
Administration (SAC) of the People's Republic of China.
National Standard of the People's Republic of China
Code for Welding of Steel Structures
Chief Drafting Organization.
Ministry of Housing and Urban-Rural Development of the People's Republic of China
Approval Organization.
Ministry of Housing and Urban-Rural Development of the People's Republic of China
Implementation Date.
August 1, 2012
China Architecture and Building Press
2011 Beijing
Announcement
of the Ministry of Housing and Urban-Rural Development
of the People's Republic of China
No.1212
Table of Contents
Foreword... 6
1 General Provisions... 8
2 Terms and Symbols... 9
3 Basic Requirement... 11
4 Materials... 13
5 Design of Welding Connections... 15
6 Welding Procedure Qualification... 41
7 Welding Procedures... 64
8 Inspection... 76
9 Weld Strengthening and Reinforcement... 86
Appendix A Form, Size and Marking Method for Welding Joint Groove of Steel
Structure... 89
Appendix B Format of WPQR... 100
Appendix C Testing of ESW Weld of Box Members... 119
Explanation of Wording in This Code... 120
List of Quoted Standards... 121
1 General Provisions
1.0.1 This code is formulated with view to implementing national technical and economic
policies in the steel structure welding, to achieving technical advancement, economic
rationality, safety and usability, and to ensuring quality and energy conservation and
environmental protection.
1.0.2 This code is applicable to the welding of structures bearing static load or dynamic load
and with steel thickness not less than 3mm in industrial and civil steel structure engineering.
The applicable welding methods in this code include shielded metal arc welding, gas-shielded
arc welding, flux cored wire self-shield arc welding, submerged-arc welding, ESW, EGW,
stud welding and their combination.
1.0.3 Steel structure welding must comply with the current relevant provisions of the nation
on safety technology and labor protection, etc.
1.0.4 Steel structure welding shall not only comply with this code, but also shall comply
with those specified in the in the current relevant standards of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Hydrogen relief heat treatment
The post-weld heat treatment method in which the welding joints of the structural steel,
which is likely to have cold crack, are heated to certain temperature (250 ~350) after ℃ ℃
welding and held for a while so as to accelerate the diffusion of hydrogen in the welding
joints and delayed crack due to the accumulation of diffusible hydrogen.
2.1.2 Stress relief heat treatment
The post-weld heat treatment method in which the welding joints are heated to the
certain temperature (550 ~650)℃ ℃ below the base metal Ac1 line after welding and held for a
while so as to reduce welding residual stress and improve joint structure property.
2.1.3 Weld access hole
The weld penetrating hole which is set at the corresponding position at the cross of
member welds in order to guarantee continuity of main weld and facilitate to welding
operation.
2.1.4 Prequalification of WPS
The welding procedures that the provisions in this code may be adopted without passing
welding procedure qualification test, under the conditions of meeting some specific welding
methods, parameters, steels, joint form and welding consumable combination correspondingly
specified in this code.
2.1.5 Temperature of welding circumstance
The temperature of the surrounding environment of weldment during welding.
2.1.8 Inspection
The checking of materials, staff, procedures, process or results and the determination of
its compliance to the specific requirement or that to general requirement on the basis of
professional judgment.
2.2 Symbols
3 Basic Requirement
3.0.1 The welding difficulty in steel structure engineering may be classified into four levels,
3.0.2 The design and construction organizations if steel structure welding engineering shall
have the qualification corresponding to the engineering structure type.
3.0.3 The construction organization undertaking steel structure welding engineering shall
meet the following requirements.
3.0.4 The qualification of relevant personnel for steel structure welding engineering shall
Welding difficulty level
3.0.5 The responsibilities of relevant personnel for steel structure welding engineering shall
meet the following requirements.
3.0.6 The safety, health and operating environment of relevant personnel for steel structure
welding engineering shall comply with those specified in the current relevant safety and
health standards of the nation.
4 Materials
4.0.1 The steels and welding materials used in steel structure welding engineering shall
meet the requirements of the design document, and shall be provided with the product
quality certificate or test report and the chemical composition, mechanical property and
other quality requirements provided by steel plant and welding material plant.
4.0.2 The re-inspection of chemical composition and mechanical property of steels and
welding materials shall meet the requirements of the relevant current quality inspection and
acceptance standards of the nation.
4.0.3 The selected steels shall be provided with complete weldability data, guiding welding
procedure, hot working and heat treatment procedure parameters, welding joint property data
of corresponding steels, etc.; new materials may be used in the engineering only after they
pass the expert demonstration, review and welding procedure qualification.
4.0.4 As for welding materials, the chemical composition of deposited metal, property
identification data and guiding welding procedure parameters shall be provided by the
manufacturer.
4.0.9 The welding wires and welding flux used for submerged arc welding shall meet the
relevant requirements of the current national standards "Carbon Steel Electrodes and Fluxs for
Submerged Arc Welding" (GB/T 5293) and "Low-alloy Steel Electrodes and Fluxs for
Submerged Arc Welding" (GB/T 12470).
4.0.10 Argon used in gas-shielded arc welding shall meet the relevant requirements of the
current national standard "Argon" (GB/T 4842) and its purity shall not be less than 99.95%.
4.0.11 The carbon dioxide used in gas-shielded arc welding shall meet the relevant
requirements of the current professional standard "Carbon Dioxide for Welding Use" (HG/T
2537). As for the important welding nodal points of primary members used in special steel
structural engineering with the welding difficulty of Level C and Level D,
5 Design of Welding Connections
5.1 General Requirements
5.1.1 The design of welding connections of steel structure shall meet the following requirements.
5.1.2 The identified weld symbol in the design drawing and detailed production drawing
shall meet the relevant requirements of the current national standards "Weld Symbolic
Representation on Drawings" (GB/T 324) and "Standard for Structural Drawings" (GB/T
50105).
5.1.3 In the construction drawing of steel structure design, the following welding
technology requirements shall be specified clearly.
5.1.5 According to steel structure importance, load bearing characteristic, weld form,
working environment and stress state, weld quality grade shall be selected in accordance with
the following principles.
5.2 Form and Size of Weld Groove
5.3 Theoretical Throat of Weld
5.4 Welding Nodal Points of Combined Welding Member
5.4.1 The weld size, spacing and height of plug and slot welds shall meet the following
requirements.
5.5 Technics for Avoiding the Nodal Point of Lamellar Tearing
5.5.1 In the design of the T-shaped, cross and angle joint, where the thickness of the flange
plate is not less than 20mm, the larger welding shrinkage stress shall be avoided or reduced on
the direction of the plate thickness of the base metal, the following nodal point construction
designs should be taken.
5.6 Welding Connection Design of Member Production and Field Installation
5.6.1 The type of welding nodal point in the member production shall meet the following
requirements.
5.6.2 Type of welding nodal point in field installation shall meet the following
requirements.
5.7 Design of Welding Connections Bearing Dynamic Load and Anti-earthquake
5.7.1 Where fatigue assessment shall be conducted for bearing dynamic load, it is
strictly forbidden to adopt joints of plug welding, groove welding, ESW and EGW.
5.7.2 Where it is bearing dynamic load, the plug welding, groove welding, fillet welding
and butt joints shall meet the following requirements.
5.7.3 As for member bearing dynamic load, the combined welding nodal point form shall
meet the following requirements.
5.7.4 When welding the anti-earthquake structure frame column to rigid connection nodal
point of beam, it shall meet the following requirements.
5.7.6 The weld access hole of beam web at junction of beam and column shall meet the
following requirements.
6 Welding Procedure Qualification
6.1 General Requirement
6.1.1 As for the steels, welding consumables, welding method, joint type, welding
position, post-weld heat treatment (PWHT) system as well as various parametrical
composition conditions (welding parameter, preheating and afterheat measures) adopted
by constructor for the first time, they shall complying with the principle of
prequalification specified in Section 6.6 in this code, and welding procedure qualification
shall be conducted before steel structure member manufacture, installation and
construction.
6.2.2 The substitute principle of welding procedure qualification of different steels (except
for stud welding) shall meet the following requirements.
6.2.3 Assessment shall be conducted again where joint type changes; the assessment results
of cross joint may substitute that of T-shaped joint, assessment results of composite butt and
6.2.4 The applicable thickness scope of thickness of acceptable test piece in engineering
shall be in accordance with those specified in Table 6.2.4.
6.2.5 As for the joint of acceptable pipe material, the coverage of wall thickness shall meet
those specified in Article 6.2.4 in this code, and coverage principle of diameter shall meet the
following requirements.
6.2.6 As for butt joint of sheets and butt joint of pipe material with outside diameter not less
than 600mm at corresponding position, their welding procedure qualification results may
substitute each other.
6.3 Requalification
6.3.1 As for shielded metal arc welding, requalification shall be conducted where one of the
following conditions changes.
6.3.6 As for EGW, requalification shall be conducted where one of the following conditions
changes.
6.3.7 As for stud welding, requalification shall be conducted where one of the following
conditions changes.
6.4 Preparation of Test Pieces and Samples
6.4.1 The preparation of test piece shall meet the following requirements.
6.4.2 The category and processing of inspection sample shall meet the following
requirements.
6.5 Testing
6.5.1 The appearance inspection of test piece shall meet the following requirements.
6.5.1-1.Where electric arc welding method is adopted for stud welding, the minimum weld
leg size of weld shall also meet the requirements of Table 6.5.1-2.
7 Welding Procedures
7.1 Preparation of Base Metal
7.1.1 The surface to be welded and both sides of the abase metal shall be uniform, smooth,
clean and free from burr, crack and other defects unfavorable for weld quality. The range
within 30mm from the surface to be welded to the edge of the weld groove shall be free from
oxide skin, rust, grease and water which may affect the normal weld and weld quality.
7.1.2 Machine processing, thermal cutting, carbon arc air gouging, gouging and polishing
may be adopted for the processing or defect removal of welded joint groove.
7.2.2 The storage site of welding consumables shall be dry and well-ventilated; a special
person shall be arranged to be responsible for preservation, drying, release and recycle, and
detailed record shall be provided.
7.2.3 The preservation and drying of electrodes shall meet the following requirements.
7.3 Assemble Requirement of Welding Joint
7.3.1 The size of welding groove should meet the requirements of Appendix A in this code,
and the permissible size deviation for groove after assembling shall meet the requirements of Table 7.3.1.
7.3.2 The joint clearance must not be filled with foreign bodies like electrode grips and iron blocks.
7.4 Tack Weld
7.5 Welding Environment
7.5.1 As for shielded metal arc welding and self-shield flux-cored wire electric arc welding,
the maximum wind speed in the welding operation area should not exceed 8m/s while that of
the gas shielded arc welding should not exceed 2m/s; where the above range is exceeded,
effective measures shall be taken to protect the welding arc area from wind effect.
7.6 Preheat and Interpass Temperature Control
7.6.1 The preheat temperature and interpass temperature shall be determined or subject to
welding test according to comprehensive factors like the chemical composition of steel,
restraint state of joint, amount of heat input, hydrogen content level of deposited metal
deposited metal and the adopted welding method.
7.6.2 Where the common steels is welded by medium heat input, the minimum preheat
temperature should meet the requirements of Table 7.6.2.
7.6.5 The preheat and interpass temperature control shall meet the following requirements.
7.6.6 The determination of preheat temperature and interpass temperature for Category III
and Category IV steels and hardened and tempered steels shall meet the instructive parameter
requirements provided by the steel plant.
7.7 Post-weld Hydrogen Relief Heat Treatment
7.7.1 Where hydrogen relief heat treatment after welding is required, it shall meet the
following requirements.
7.8 Post-weld Stress Relief Treatment
7.9 Weld Tab and Backing
7.10 Technic Requirement of Welding Procedure
7.11 Control of Welding Deformation
7.12 Repairs
7.12.1 Where defects of the weld metal or base metal exceeds corresponding quality
acceptance level, grinding wheel polishing, carbon arc air gouging, gouging or mechanical
processing methods may be adopted to thoroughly remove such defects. The repair of weld
shall be carried out according to the following requirements.
7.12.2 The repair weld shall be subject to testing and acceptance according to the original
testing method and quality standard; the repair construction record and non-destructive
inspection report before or after repair shall be filled and submitted as the engineering
acceptance and file data.
7.13 Correction
7.14 Back Gouging
7.15 Temporary Welds
7.16 Striking and Extinguish of Arc
7.17 ESW and EGW
8 Inspection
8.1 General Requirement
8.1.1 The welding inspection shall be divided into two categories according to the following
requirements.
8.1.2 General procedures of welding inspection include the pre-welding inspection, welding
inspection and post-welding inspection, and shall meet the following requirements.
8.1.3 The inspection and test plan shall be prepared according to the load bearing
characteristics of the structure and the weld quality grade requirements specified in the
construction detail and technical documents; the technical principal is responsible to approve
such plan and submit it to the supervision engineer for record. The inspection scheme shall
include the division of inspection batch as well as the sampling method, inspection item,
inspection method, inspection time and corresponding acceptance criteria of sampling
inspection.
8.1.4 The sampling method of weld inspection shall meet the following requirements.
8.1.5 The appearance testing shall meet the following requirements.
8.1.7 The ultrasonic testing shall meet the following requirements.
8.1.8 The result judgment of sampling inspection shall be carried out according to the
following requirements.
8.1.9 All detected rejected welding positions shall be repaired according to the requirements
of Section 7.11 in this code until they are acceptable.
8.2 Weld Inspection of Structure Bearing Static Load
8.2.1 The weld appearance quality shall meet the requirements specified in Table 8.2.1.
8.2.2 The overall size of weld shall meet the following requirements.
8.2.3 The basic requirements of non-destructive testing shall meet the following
requirements.
8.2.4 The ultrasonic testing shall meet the following requirements.
8.3.3 The non-destructive testing shall meet the following requirements.
8.3.4 The ultrasonic testing shall meet the following requirements.
9 Weld Strengthening and Reinforcement
9.0.1 The weld strengthening and reinforcement design of steel structures shall meet the
relevant requirements specified in the current national standards "Code for Acceptance of
Construction Quality of Strengthening Building Structures" (GB 50550) and "Code for
Seismic Design of Buildings" (GB 50011). The strengthening and reinforcement scheme shall
be determined jointly by the Designer, the Constructor and the Owner.
9.0.2 The strengthening and reinforcement design scheme shall be prepared with the
following technical data.
9.0.3 For the weld strengthening or reinforcement design of steel structure, the adverse
effect of aging on steel plasticity shall be considered rather than the improved yield strength
of steels after aging.
9.0.5 The weld strengthening and reinforcement of steel structure in special corrosion
environment shall be determined by specialized research.
9.0.6 The weld strengthening or reinforcement of steel structure shall be carried out
according to the following methods.
9.0.7 The strengthening and reinforcement carried out under load condition shall meet the
following requirements.
9.0.8 During weld strengthening or reinforcement under load condition, the following
measures may be taken according to specific conditions.
9.0.9 The weld strengthening or reinforcement construction under load conditions shall
meet the following requirements.
9.0.10 The bearing capacity assessment shall be carried out for members with defects. For
serious defects affecting structure safety, the unloading and reinforcement measures shall be
taken immediately or the damaged member shall be replaced timely; for ordinary defects, they
shall be repaired or strengthened by welding according to the following methods.
9.0.11 The weld strengthening and reinforcement 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.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB 50661-2011 be delivered?Answer: The full copy PDF of English version of GB 50661-2011 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB 50661-2011_English with my colleagues?Answer: Yes. The purchased PDF of GB 50661-2011_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB 50661-2011 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. How to buy and download a true PDF of English version of GB 50661-2011?A step-by-step guide to download PDF of GB 50661-2011_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB 50661-2011".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |