Code of repair welding for blade of steam turbine and runner of hydroturbine
1 Scope
This standard specifies the technical conditions and inspection requirements for repair welding for blades of steam turbine and runners of hydroturbine.
This standard is applicable to the repair welding of steam turbine blades, blade shrouds and lacing wires in fossil-fuel power plants, and the repair welding of hydroturbine runners in hydropower plants.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3323 Radiographic examination of fusion welded joints in metallic materials
GB/T 11345 Non-destructive testing of welds—Ultrasonic testing—Techniques, testing levels, and assessment
GB/T 29712 Non-destructive testing of welds—Ultrasonic testing—Acceptance levels
DL/T 438 The technical supervision codes for metal in fossil-fuel power plant
DL/T 675 Examination codes for qualification of non-destructive testing personal of electric power industry
DL/T 679 Code for welder technical qualification
DL/T 819 The code of the welding heat treatment for power plant
DL/T 868 Qualification standard for welding procedures
DL/T 869 The code of welding for power plant
DL/T 1318 Technical supervision code for hydroelectric power plant metals
JB/T 3223 Welding consumables quality management procedures
NB/T 47013.4 Nondestructive testing of pressure equipment—Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipment—Part 5: Penetrant testing
SJ/T 10743 Ceriated tungsten electrodes for inert gas arc welding and plasma welding and cutting
3 General rules
3.1 Welding personnel
3.1.1 General requirements
Welding personnel include welding technicians, welders, welding heat treatment personnel and inspectors. All types of personnel shall meet the provisions of this standard in addition to the relevant requirements of DL/T 869.
3.1.2 Welding technicians
3.1.2.1 Welding technicians shall be technicians from the welding major or similar majors with the title of engineer or above, and shall be in charge of the welding process test and the repair welding for blade of steam turbine and runner of hydroturbine.
3.1.2.2 Welding technicians shall know the operating conditions of the parts to be repaired and the causes of defects, master the welding performance of the materials of the parts to be repaired, and be acquainted with and conscientiously implement this standard.
3.1.2.3 Welding technicians are responsible for determining the inspection position, recording, checking and sorting out the welding data and compiling the technical summary.
Foreword i
1 Scope
2 Normative references
3 General rules
3.1 Welding personnel
3.2 Welding process test
3.3 Welding materials and management
3.4 Equipment for repair welding
3.5 Safety requirements and environment conditions
4 Preparation before repair welding
4.1 Confirmation of material and determination of defect location
4.2 Removal of defects
4.3 Groove and fitting
5 Repair welding process
5.1 Repair welding process for steam turbine blade
5.2 Repair process for hydroturbine runner
6 Quality inspection
6.1 Inspection contents
6.2 Appearance inspection
6.3 Non-destructive testing
6.4 Hardness and metallographic inspection
6.5 Others
7 Weld repair
8 Technical documents
Code of repair welding for blade of steam turbine and runner of hydroturbine
1 Scope
This standard specifies the technical conditions and inspection requirements for repair welding for blades of steam turbine and runners of hydroturbine.
This standard is applicable to the repair welding of steam turbine blades, blade shrouds and lacing wires in fossil-fuel power plants, and the repair welding of hydroturbine runners in hydropower plants.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3323 Radiographic examination of fusion welded joints in metallic materials
GB/T 11345 Non-destructive testing of welds—Ultrasonic testing—Techniques, testing levels, and assessment
GB/T 29712 Non-destructive testing of welds—Ultrasonic testing—Acceptance levels
DL/T 438 The technical supervision codes for metal in fossil-fuel power plant
DL/T 675 Examination codes for qualification of non-destructive testing personal of electric power industry
DL/T 679 Code for welder technical qualification
DL/T 819 The code of the welding heat treatment for power plant
DL/T 868 Qualification standard for welding procedures
DL/T 869 The code of welding for power plant
DL/T 1318 Technical supervision code for hydroelectric power plant metals
JB/T 3223 Welding consumables quality management procedures
NB/T 47013.4 Nondestructive testing of pressure equipment—Part 4: Magnetic particle testing
NB/T 47013.5 Nondestructive testing of pressure equipment—Part 5: Penetrant testing
SJ/T 10743 Ceriated tungsten electrodes for inert gas arc welding and plasma welding and cutting
3 General rules
3.1 Welding personnel
3.1.1 General requirements
Welding personnel include welding technicians, welders, welding heat treatment personnel and inspectors. All types of personnel shall meet the provisions of this standard in addition to the relevant requirements of DL/T 869.
3.1.2 Welding technicians
3.1.2.1 Welding technicians shall be technicians from the welding major or similar majors with the title of engineer or above, and shall be in charge of the welding process test and the repair welding for blade of steam turbine and runner of hydroturbine.
3.1.2.2 Welding technicians shall know the operating conditions of the parts to be repaired and the causes of defects, master the welding performance of the materials of the parts to be repaired, and be acquainted with and conscientiously implement this standard.
3.1.2.3 Welding technicians are responsible for determining the inspection position, recording, checking and sorting out the welding data and compiling the technical summary.
Contents of DL/T 905-2016
Foreword i
1 Scope
2 Normative references
3 General rules
3.1 Welding personnel
3.2 Welding process test
3.3 Welding materials and management
3.4 Equipment for repair welding
3.5 Safety requirements and environment conditions
4 Preparation before repair welding
4.1 Confirmation of material and determination of defect location
4.2 Removal of defects
4.3 Groove and fitting
5 Repair welding process
5.1 Repair welding process for steam turbine blade
5.2 Repair process for hydroturbine runner
6 Quality inspection
6.1 Inspection contents
6.2 Appearance inspection
6.3 Non-destructive testing
6.4 Hardness and metallographic inspection
6.5 Others
7 Weld repair
8 Technical documents
