1 General
1.0.1 This code is applicable to design, manufacture, installation and overhaul of electric power system of energy industry, as well as inspection of welding of boilers, pressure pipelines, pressure vessels and steel structure of thermal power generation equipment of 600MW or below.
1.0.2 This code is applicable to manual arc welding, manual argon tungsten-arc welding, oxy-acetylene welding, automatic submerged arc welding, etc. of carbon steel (carbon content≤0.35%), common low alloy steel and heat-resistant steel. For other materials and welding methods, establish technical requirements by reference to this code and relevant standards.
1.0.3 Unless otherwise specified in construction contract, the construction and acceptance of the thermoelectric generating sets imported from abroad shall be carried out according to this code.
1.0.4 Testing of weld quality shall be appraised respectively according to operating conditions of work pieces and quality requirements.
1.0.5 Testing of metal materials, check of weld junction of equipment, ball-passing test, welding process qualification, quality examination of weld joints as well as evaluation of welders shall be performed respectively according to the related regulations.
1.0.6 Regulations about safety, environment protection, fire protection, etc., must be observed during the course of welding (welding, heat treatment and metal testing).
2 Welding Personnel
2.0.1 Welding personnel include welding technical personnel, welding quality inspectors, welding testers, welders and welding heat treatment personnel.
2.0.2 Each enterprise shall have special technical chief, responsible for welding, and full-time welding quality inspector.
2.0.2.1 Special technical chief, responsible for welding, shall be engineer (technician) or higher level technicians with relative high special engineering level and rich experience in welding who are responsible for welding process and quality management as well as qualification evaluation of welding personnel, etc.
2.0.2.2 Each enterprise and its competent department shall organize professional technical training for welding personnel to improve their technical level, theoretical level of specialty and management level.
2.0.3 Basic requirements on welding personnel and working contents
2.0.3.1 Welding technical personnel
(1) Those technical personnel, who first undertake welding technology management, must accept production practice and system training and achieve corresponding qualification through examination before they undertake the task.
(2) Master general conditions of projects, strictly execute this code, edit welding plans and draft technical measures according to the actual situation, work out schemes for training welders, attend the welders technical examination committee and participate in technical evaluation of welders and inspection of management of welding materials.
(3) According to the technical measures, communicate with related personnel deeply about technology, provide technical guidance in practice and supervise.
(4) Organize welding process qualification and compile operation instructions of welding.
(5) Participate in quality acceptance of main pipes and components.
(6) Record, inspect and sort out welding materials, transfer technical documents of project completion and perform technical summarization as well.
1 General
2 Welding Personnel
3 Steel Products and Weld Materials
4 Preparation for Welding
5 Welding Process
6 Post-weld Heat Treatment
7 Quality Inspection
8 Quality Standard
9 Technical Documents
Annex A Chemical Compositions, Mechanical Performance and Reference Data for Common Steels in Power Plants
Annex B Chemical Compositions and Mechanical Performance at Normal Temperature of Deposited Metal for Common Welding Rods
Annex C Chemical Compositions of Common Welding Wire
Annex D Table for Common Weld Flux of Automatic Submerged Arc Welding
Annex F Cutting Positions and Specifications of Weld Joints for Quality Inspection Samples
Annex G Catalogue of Relevant Standards and Specifications
Annex E Recommendation Form of Welding Rod (Welding Wire) for Welding Dissimilar Steels and Post-Weld Heat Treatment Temperature
