This standard specifies the welding, weld inspection, post-weld heat treatment and mechanical property test of welded test plates for pressure parts of marine auxiliary boilers and pressure vessels. This standard applies to boilers with a design pressure not exceeding 2.5 MPa and a medium of water and saturated steam; and pressure vessels with a design pressure not exceeding 6.4 MPa and a medium of water or air with a temperature not exceeding 150°C. GB/T 11038-2000 Technical conditions for welding of marine auxiliary boilers and pressure vessel components GB/T11038-2000 Standard download decompression password: www.bzxz.net

ICS 47. 020. 20
National Standard of the People's Republic of China
GB/T 11038: 2000
Welding specifications for pressure parts of marine auxiliary boiler and pressure vessel2000-03-16Promulgated
Implementation on 2000-12-01
Promulgated by the State Administration of Quality and Technical Supervision
W.bzsoso.cOIGB/T11038·2000
This standard is a revision of GB11038—1989. This standard is revised based on the experience of implementing GB11038—1989 and in accordance with the rules and relevant standards of domestic and foreign classification societies. Compared with GB11038-1989, this standard has the following minor revisions: 1. It is clarified that the applicable scope of this standard is boilers with a design pressure not exceeding 2.5MPa and the medium is water and saturated steam; the design pressure is not greater than 6.4MPa and the medium is water or air with a temperature not higher than 15CC. 2. Specific provisions are made for the classification of Class I and II marine boilers and Class I, I, and III pressure vessels; 3. The content of the design, welding, inspection and testing of T-joint butt welding chains is added. 4. The original European national standard is changed to a recommended national standard. This standard replaces GB11038-1989 from the date of implementation. This standard is proposed by the State Shipbuilding Corporation. This standard The standard is approved by the Seventh Research Institute of China Shipbuilding Industry Corporation! . The first units of this standard: Jiangsu Hailu Boiler Group Corporation, Oubao Industry (Qingpin) Co., Ltd., China Classification Society Nanjing Branch Pressure Ship Industry Comprehensive Technology and Economic Research Institute, Qingdao Marine Steel Furnace Factory, China Classification Society Qingshou Branch. The drafters of this standard: Liu Guoliang, Zhang Zuming, Bao Guozhen, Zhong Rongxin, Jia Wende, Hu Guangfu, Che Rui, Min Pingqiang. This standard was first issued in March 1989.
WW.bzsoso.cOm1 Scope
National Standard of the People's Republic of ChinabzxZ.net
Welding spceifications for pressure parts ofmarine auxiliary hoiler and pressure vessel vesselGB/T11038—2000
Replaces G110381989
The standard specifies the welding, weld inspection, post-weld heat treatment and mechanical property test of welded test plate pressure components of auxiliary boilers and pressure vessels for ships (hereinafter referred to as boilers and pressure vessels). This standard is applicable to boilers with a design pressure not exceeding 2.5MPa and a medium of water and saturated steam, and a design pressure not exceeding 6.4MPa. The medium is water or air with a temperature not exceeding 150°C. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is published, the versions shown are valid, and all standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T98-1988 Basic forms and dimensions of weld grooves for gas welding, manual electric welding and gas shielded welding GB/T986-1988 Basic forms and dimensions of weld grooves for buried incandescent welding GB/T3323-1987 Radiography and quality classification of steel fusion butt joints JB4730-1934 Nondestructive testing of pressure vessels 3 Requirements
3.1 General requirements
3.1.1 Qualification and marking of welders
3.1.1.1 All welders engaged in welding of pressure components of boilers and pressure vessels shall hold welder qualification certificates issued by the ship inspection department and can only perform welding work corresponding to their qualification categories. 3.1.1.2 After welding, the welder shall stamp a low stress weld mark near the main weld and indicate the welded joint and the stamp number on the welding card.
3.1.2 Welding materials
3.1.2.1 The strength and properties of the selected welding materials shall meet the following requirements: a) The tensile strength of the deposited metal shall not be less than the minimum tensile strength specified for the parent material, and shall not be greater than the minimum tensile strength specified for the parent material plus 145 N/rmm:
b) The elongation of the deposited metal shall be ≥ (980-0)/21.6, and shall not be less than 80% of the minimum elongation specified for the parent material; 3.1.2.2 For welding between steels with similar metallographic structures and different strength grades, welding materials with tensile strength between the two shall be selected.
3.1.2.3 All welding materials must be approved by the ship inspection department and have a certificate of conformity. Approved by the State Administration of Quality and Technical Supervision on March 16, 2000, and implemented on December 1, 2000
W3.1.3 Welding environment
GB/T 11038--2000
3.1.3.1 In some welding environments [H], when any of the following conditions occurs, welding is strictly prohibited without effective protective measures: 1a) Wind speed is greater than 10m/s during manual welding and wind return is greater than 2n/s during gas shielded welding; b) Humidity is greater than 90%:
( ) below, outside work when snowing
3.1.3.2 When the temperature of the weldment is below 0°C, it should be preheated to about 15°C within 100mm on both sides of the welding location before welding can be carried out. 3.1.4 Welding equipment
Welding equipment should meet the following requirements:
a) Install the pipe in a sheltered place and can be grounded;
b) Ensure the required welding quality, maintain effective working condition and have appropriate facilities. The meter for measuring current and positive current and voltage should be inspected weekly within the validity period.
3.1.5 Weld seam design
3.1.5.1 The main welds on the shell of boilers and pressure vessels should be butt welded. 3.1.5.2 If the shell and the tube are butt welded with T-joints, the following conditions should be met: a) The joint must be fully welded, and the groove must be machined; b) The weld groove must be opened on the tube!
c) The weld thickness of the T-joint connection should not be less than the thickness of the tube sheet, and the parts of the back of the weld that can be sealed should be sealed. The parts that cannot be sealed should be primed with hydrogen weak welding, and ensure that the weld is far away. 3.1.5.3 Short pipes, flanges and seat plates on boilers and pressure vessels should generally adopt double-sided continuous fillet seams. 3.1.5.4 It should be avoided that more than two welds intersect at one place. Butt welds should not intersect at sharp angles. The distance between main welds should not be less than 200mm. The distance between the fillet weld of the pressure-bearing part and the edge of the butt main weld is generally not less than 50mms. 3.1.5.5 The weld of non-pressure-bearing parts should not pass through the main weld or pipe weld. The distance between the edge of the weld of the non-pressure-bearing part and the edge of the main weld or joint weld should not be less than 2 times the thickness of the pressure-bearing part plate or 4cm (whichever is smaller). If it is impossible, it should pass through the main weld and be arranged symmetrically, and should not stop near the continuous joint key area of ​​the main weld. 3.1.5.6 Avoid opening holes in welds or near welds. When the distance from the center line of the weld to the edge of the hole is less than 60mm or 4 times the hole plate thickness (whichever is greater), the hole should pass through the weld chain so that the center line of the weld and the center line of the hole can coincide as much as possible. At this time, both sides of the weld hole should be subjected to non-destructive testing. The length of each side should be at least 60mm (the maximum value), and heat treatment is required.
If the shell and temporary plates of different thicknesses are connected, the tube sheet and shell plate should be connected (see Figure 1) so that the center of the thickness of the plate with different thicknesses on the cross section of the shell forms a continuous circle. The weld wall edge of the thick plate should be machined and beveled, and the bevel length should be not less than 2 times the plate thickness difference. Figure 1
3.1.5.B For the butt joint of oblate spherical or spherical heads and shell plates, when the original grooves of the head and shell are the same along the entire circumference, the thicker plate shall be machined 1. The bottom of the bevel is smooth and the slope is not greater than 1:4. The thickness of the head and shell at the circumferential joint is the same. 2
W.GB/T 110382000
, etc., see Figure 2. A straight section may be left between the end of the bevel of the plate and the weld groove, and the wall slope may also be used as part of the bevel length 6.
The thickness at the girth weld shall not be less than the required thickness for a seamless shell or welded shell of the same diameter and material in any case. Figure 2
3.1.5.9 When the hemispherical head is butt-welded with the cylinder, the double body part should be unwound to the head, and the straight part of the cylinder and the seam should form a ring segment of the semi-circular head, see Figure 3. If the hemispherical head has a straight edge and is butt-welded with the cylinder, the thickness of the straight edge part should not be less than the thickness required for the cylinder or the cylinder, Figure 3
3.1.6 Bevel type of weld
3.1.6.1 Bevel type of manual welding and gas shielded welding - generally in accordance with the requirements of GB/T985. W.GB/T 11038-2000
3.1.6.2 Bevel type of automatic welding weld is generally in accordance with the requirements of GB/T 986. 3.1.6.3 When other bevel types are used for manual welding and automatic welding, the approval of the ship inspection department shall be obtained. 3.1.7 Welding Procedure Approval
3.1.7.1 The welding procedure specification shall be subjected to welding procedure approval test and shall be used only after passing the test. 3.1.7.2 For welding procedures that must be subjected to approval test, the test shall be carried out when the surveyor is on duty. After the test, the test results shall be recorded in the procedure approval test report and submitted to the surveyor for approval together with the procedure specification. 3.1.7.3 If the welding procedure is approved by the surveyor, the welding procedure approval test may be exempted when welding is carried out according to this procedure in the future. When the manufacturing unit makes changes to the approved welding process specification, all details of the changes should be reported to the ship inspection department, which will determine whether to conduct a welding process test based on the specific content of the changes. 3.1.7.4 The scope of application of the approved welding process shall refer to the relevant regulations of the classification society: 3.1.8 Preparation before welding
3.1.B.1 Before welding, the surface of the groove and the welding edge on both sides of the weld should be polished to expose the natural luster, and any dirt that affects the quality of the weld should be removed. 3.1.8.2 Positioning defects and edge defects that affect the quality of welding should be removed and repaired before welding. 3.1.8.3 The groove and other welding edges can be machined, chiseled or polished, or they can be polished after gas cutting, but the damaged areas during gas cutting should be repaired.
3.1.8.4 Before formal welding, a bottle plate and an arc extinguishing plate must be added to the longitudinal weld (or test plate). 3.1.8.5 Welding work should be carried out in the half-weld position as much as possible. 3.1.B.6 The misalignment between the two sides of the butt weld of the boiler and the pressure vessel shell at any point should not exceed 10% of the plate thickness, and the longitudinal weld should not exceed 3 mm and the longitudinal weld should not exceed 4 mm. 3.1.8.7 The misalignment between the two plate surfaces of the butt weld of the spherical head and the cylindrical transformer shell at any point should not exceed 10% of the plate thickness and should not exceed 3 mm.
3.1.8.8 When assembling welds, they shall not be aligned forcefully, and the uneven parts of the steel plate shall not be hit. 3.1.9 Positioning welding
3.1.9.1 The welding materials for the positioning weld shall be the same as those for the above-mentioned welding. 3.1.9.2 Positioning welds that have been inspected and found to be free of cracks can be kept. 3.1.10 Arc Striking
Arc striking for electric welding shall not be carried out on the parent material outside the weld. Accidental arc points shall be removed by grinding and inspected by magnetic particle inspection or penetrant inspection.
3.2 Welding
3.2.1 Shell welds of boilers and pressure vessels shall generally be welded on both sides. Root cleaning shall be carried out before bottom welding. If the structure is special and bottom welding is really impossible, with the consent of the ship inspection department, pads may be installed for welding, but the composition of these plates shall be alternate with that of the shell plate. 3.2.2 When single-sided welding is adopted, appropriate measures shall be taken to ensure that the root of the weld can be fully penetrated and the deformation caused by the shrinkage of the weld metal is minimized.
3.2.3 If preheating is required due to the constraint of the joint, the thickness of the plate and the composition of the welded material, a welding process that preheats and maintains the lowest temperature between welds shall be adopted.1 Technology!
3.2.4 When performing multiple passes of welding, attention should be paid to slag removal between the front and rear passes. After welding is interrupted for some reason, the welds of the interrupted welding should be cleaned and the slag should be removed before re-welding, so that the molten metal of the later weld can be completely fused with the plate and the previously smelted metal. 3.2.5 The fillet welds of the short pipes, flanges and seat plates on the steel furnace and the pressure vessel body should be welded before heat treatment (when required). 3.2.6 The outer surface of the weld can be flush with the surface of the shell plate, or the total thickness of the weld center can be made slightly greater than the plate thickness, but the cross-sectional change of the weld chain reinforcement height should be gradually shortened.
3.2.7 The accessories such as the pull-up bracket, the shelf, the branch pipe, the manhole frame and the reinforcement plate around the opening connected to the shell plate should be basically in contact with the shell plate, and should be welded before the shell heat treatment (when required). If welding is necessary after heat treatment due to structural requirements, the consent of the ship's inspection department should be obtained. G3/T 11038—2000 3.2.8 When the above-mentioned accessories are used to support the internal and external structures and are welded to the shell plate, the welding process should be the same as that required by the shell plate, and the material composition should also be equivalent to that of the shell plate: 3.3 Weld quality 3.3.1 Surface quality of welds 3.3.1.1 The surface of the weld of the pressure shell should be uniform and dense. There should be no cracks, weld nodules, bites, pores, head slag, arc pits and unfilled depressions. If there are any of the above defects, they should be repaired before non-destructive testing. 3.3.1.2 The dimensions of the weld shall meet the following requirements: a) Weld chain excess height: 0-4 mm for automatic welding; 0~3 mm for industrial welding; and not more than 0.1 times the weld width 1 mm b) Weld seam thickness: The coverage of each weld joint shall not be less than 2~4 mm t) The weld and the parent material shall have a smooth transition, and the part with dimensions that do not meet the requirements shall be repaired before non-destructive testing. 3.3.2 Requirements for non-destructive testing of welds
3.3.2.1 The welds of Class I and Class II furnaces and pressure vessels shall be subjected to non-destructive testing. The testing methods, testing ratios and locations shall comply with the provisions of Table 1. The welds of Class II pressure vessels may be exempted from non-destructive testing. Table 1
Testing methods
Radiographic testing
Ultrasonic testing
Powder feeding or penetration testing
Electron testing
p>n. 33 MPs
Design output>3.92MPa
or plate thickness>10mm
All sieve bodies, tubes, headers, longitudinal and annular structures, and joint test plates should be 100% inspected. For headers, headers and other components, when the outer diameter is not more than 170mm, the annular points of the molded press heads should be 10% inspected.
P,6.t are all less than the 1st level rated
L p1. 57 MPa
or>16mm
Test plates should be 100% inspected; 10% of the joints should be inspected.
Guards, combustion valves and other special parts should be locally inspected. 1) Plate thickness exceeds 30 mm, ultrasonic detection can be used instead of radiographic detection. If necessary, high-end welds can be selected for radiographic detection.
2) Each T-type connection between the tube sheet and the cylinder should be 100% ultrasonically inspected.
: 3) The welds of the T-type connection between the general plate and the end of the tube should be 50% ultrasonically inspected.
For welds of the column, cavity plate, short tube and branch pipe that have been inspected by radiography, a spot check of 10 heads of powder injection or penetration testing should be conducted.
p1.57M At the same time
+16 mm A *150℃
If the surface finish of the weld surface and its surrounding areas hinders the accuracy of non-destructive testing, these parts should be polished to the roughness requirements specified in the specification.
3.3.3 Evaluation of non-destructive testing of welds
3.3.3. 1. Radiographic testing is conducted according to GB/T 3323, and longitudinal and circumferential welds meet the requirements of Grade I. 3.3.3.2. Ultrasonic testing is conducted according to GB/T 4730, and longitudinal and circumferential welds meet the requirements of Grade 1. 3.3.3.3.4. Ultrasonic testing of butt welds of T-joints is conducted according to GB/T 4730, and longitudinal and circumferential welds meet the requirements of Grade 1. 3.3.3.5. Ultrasonic testing of butt welds of T-joints is conducted according to GB/T 3323, and longitudinal and circumferential welds meet the requirements of Grade 1. 3.3.3.6. Ultrasonic testing of butt welds of T-joints of industrial boilers is conducted according to GB/T 11038-2000. 3.3.3.7. Ultrasonic testing of butt welds of T-joints of industrial boilers is conducted according to GB/T 11038-2000. 3.3.3.8. Mechanical properties of welded test plates shall meet the requirements of GB/T 11038-2000. 3.3.4.1 The mechanical properties of welded test plates shall meet the requirements of GB/T 11038-2000. Table 2
Test Item R
Qualified Mark
1) Resistance strength: not less than the minimum tensile strength of the parent material, E,Not less than the minimum flame retardant strength specified for the parent material. Tensile test
Bending test
Joint transverse tensile test
fracture and macroscopic inspection
impact test
tensile strength plus 15 N/ms.
2) The elongation ratio is 6:12, and the elongation is not less than 80% of the specified elongation of the parent material. 21.6
After the specimen is bent, the specimen is pulled out of the surface. The length of the crack or other defects is not more than 3 mm. The strength of the butt joint shall not be less than the minimum strength specified for the parent material. There shall be no incomplete penetration, incomplete fusion, large slag or other defects. In the impact test, the arithmetic mean impact energy of thirty impact specimens shall not be less than 27 J, and it is allowed that one of the test values ​​is lower than the specified average value, but not lower than 70% of the specified average value. 3.3.4.21 Impact test is exempted from the mechanical property test of welding test plates for class 1 boilers and pressure vessels. 3.3.4.3 Short-circuit test plate is exempted for Class I pressure vessels. 3.4 Post-weld heat treatment
3.4.1 General requirements
3.4.1.1 Heat treatment of exhaust furnaces and pressure vessels together with their welded test plates shall be carried out after welding and before pressure test. 3.4.1.2 The following boilers and pressure vessels may be exempted from post-weld heat treatment: a) Class I boilers and pressure vessels, when carbon steel or carbon-manganese steel is used, and the thickness of their welded components is less than 20 mm; b) Class I boilers and pressure vessels, when carbon steel is used, the thickness of their welded components is less than 30 mm and the working temperature is not higher than 150°C; or carbon-manganese steel is used, the thickness of their welded components is less than 201 mm1 and the working temperature is not higher than 150°C; c) All positive pressure vessels.
3.4.1.3 Boilers and pressure vessels should generally be heat treated as a whole. If due to limited conditions, it is not possible to perform heat treatment as a whole, it is allowed to perform treatment in sections, but it should be ensured that the entire length of the joint is heat treated, and the longitudinal seam heat treatment area is at least 2501 mm. Insulation measures should be taken for the parts outside the furnace.
3.4.1.4 Heat treatment should include slowly and uniformly heating the boiler and pressure vessel body to a temperature suitable for eliminating internal stress, and keeping the insulation for a suitable period of time. Then slowly and uniformly cool it in the furnace to 400℃, and finally cool it in still air. 3.4.1.5 The insulation temperature of welded components after welding is 58℃~620℃, and the insulation time is 1h for every 25mm thickness, but it should be at least 1h. The heat treatment procedure for alloy steel weldments shall be determined according to the selected materials and approved by the Inspection Department. 3.4.2 Workpiece placement
3.4.2.1 The workpiece shall be properly placed on the support at the bottom of the heat treatment furnace. The height of the support shall not be less than 20 mm, and may be 100 mm in special cases. The front plate support shall be in the same plane as far as possible, and the distance between the supports shall generally not be greater than 10 mm. 3.4.2.2 The distance between the workpiece and the wall in the heat treatment furnace shall not be less than 250 mm. When two parts are heat treated in the furnace, the distance between the workpieces shall be greater than 100 mm. The distance between the workpiece and the furnace door shall be greater than 50 mm. 3.4.2.3 The flame of the heat treatment nozzle of fuel oil or gas shall not be directly sprayed on the heat treatment workpiece. When the distance between the nozzle and the two parts is less than 300 mm, the distance between the nozzle and the two parts shall not be less than 300 mm. mm, effective measures should be taken to isolate the flame. 3.4.3 Heat treatment furnace
The structure of the heat treatment furnace should meet the requirements of heat treatment and be in good technical condition, and be equipped with a pyrometer to measure and record the temperature change in the furnace:
W.4 Inspection and test
4.1 Appearance inspection of welds
GB/T 11038-2000
Measure or use special measuring tools to check the appearance quality of welds and welder stamp marks. They should meet the requirements of 3.1.1.2 and 3.3.1. 4.2 Non-destructive testing
4.2.1 Non-destructive testing personnel
The personnel to be assessed for non-destructive testing should have a valid ship non-destructive testing personnel qualification certificate to perform non-destructive testing work corresponding to their category.
4.2.2 Non-destructive testing methods
4.2.2.1 Radiographic testing shall be in accordance with the provisions of GB/T3323, and the sensitivity of radiographic testing shall meet the following requirements: a) When using a hole-type image quality meter, the minimum aperture that can be seen on the radiograph: for crack thickness not exceeding 50 matn When the weld thickness is greater than 50mm, it should not be greater than 2% of the weld thickness. b) When using a double-wire image quality meter, the minimum diameter of the wire that can be seen on the radiograph: when the weld thickness is 1α~50mm, it should not be greater than 1.5% of the weld thickness; when the weld thickness is 50~200mm, it should not be greater than 1.26% of the weld thickness. 4.2.2.2 Ultrasonic testing shall be in accordance with the provisions of JB4730. 4.2.2.3 Magnetic testing shall be in accordance with the provisions of 3134730. 4.2.2.4 Magnetic testing shall be in accordance with the provisions of FB4730. 4.2.2.5 Ultrasonic testing of T-joints shall refer to the provisions of industrial frequency furnace T-joints butt welding. 4.2.3 The weld can be tested without loss of strength. The results of 3.3.2 and 3.3. 3 Requirements. 4.3 Mechanical property test of welded test plate and specimen 4.3.1 Requirements
4.3.1.1 The test plate shall be connected to the shell plate by tack welding, so that the test plate weld joint becomes the continuation and simulation of the longitudinal weld of the shell. 4.3.1.2 The material and thickness of the test plate shall be the same as those of the shell plate of the shell, and the welding process and heat treatment requirements of the test plate shall be consistent with those of the longitudinal weld of the shell.
4.3.1.3 The length of the test plate shall be sufficient to meet the needs of sampling during the retest. 4.3.1.4 The test plate shall generally be heat treated together with the workpiece, or heat treated in the same heat treatment furnace as the workpiece. 4.3.1.5 The girth weld of boilers and pressure vessels generally does not need to be welded with test pieces. However, if there is only a girth weld on the shell or the welding process used for the girth weld is significantly different from that of the shell, a girth weld mold test piece shall be welded. The test piece can provide a complete set of test pieces and the required retest samples. When manufacturing the same type of pressure shell, one test piece can be welded every 301 rings. 4.3.2 Test items
Test items are in accordance with Letter 4 and Table 3:
W Test group number
GB/T 11038—2000
Melt section
Cut section
(In conjunction with the testing machine)
Test sample name
Ethylene metal tensile test
Forward bending\
Reverse bending\
Transverse tensile test of joint
Section macroscopic inspection
Strike test
1) When the test plate thickness exceeds 20mm, use the bending test piece for the side bending test instead. 4.3.3 Test specimens
Required
Weak-protection and pressure vessels
4.3.3.1 The diameter of the tensile test specimen for molten metal shall be 10 mm and shall meet the following requirements: a) When the thickness of the test plate does not exceed 70 mm, one specimen may be taken, see Figure 5, Figure 5
Required
W.GB/T 11038--2000
b) If the specimen diameter cannot be 10 mm due to the thickness of the test plate, the largest actual diameter shall be taken as much as possible, and the gauge length shall be 5 times the diameter, see Figure 6.
Gauge length = 50
Parallel length = 60
Gauge length = 5#
Parallel length of sample -
c) Before the test, the sample can be heated to no more than 250 °C for no more than 16 h for dehydrogenation treatment. 4.3.3.2 The shape and size of the transverse tensile test specimen of the joint shall be as shown in Figure 7 plus 1. The upper and lower surfaces of the weld shall be flat, polished or machined flush with the base material.
) Flat specimen
11) Round ridge test
--Weld width t--Specimen thickness: 5--Parallel section width of flat specimen, take 25mm:--Parallel section width of round tube test, take 20mm for tubes with diameter equal to or greater than 76mm:--Take 12mm for tubes with diameter less than 76mm1. The whole tube shall be stretched; J--Parallel section length of specimen, take 32 or B+12mm (the larger one) 7
4.3.3.3 When the breaking force of the specimen exceeds the capacity of the loading device, it can be divided into several specimens as shown in Figure 8 for transverse tensile test, and the thickness of each specimen shall not be less than 25mm. The arithmetic average of the test results of each specimen shall be taken as the test result of the whole joint. Specimen-
Upper specimen
) 2550
Second specimen!
W.GB/T11038--2000
4.3.3.4 The shape and size of the positive and negative bending test specimens of butt welds shall be processed according to Figure 9. The upper and lower surfaces of the weld shall be flattened, polished or machined to be flush with the surface of the base material. The tensile surface of the test specimen is allowed to be extended to 1 to 2 mm on both sides. The compression surface of the pipe test specimen can be machined or turned into a plane:
) Flat plate bending test selection
All bending test specimens
Specimen thickness, ie, the parent material thickness, if the original thickness exceeds 25 mm, the compression side of the test specimen can be turned to 25 mm: b- Flat plate test width, take 30 mm ie- Pipe test specimen width, item: 0.1d. but not less than 10mm, not more than 30mm, where a is the thickness of the pipe test piece Figure 9
4.3.3.5 The shape and size of the butt weld side test specimen shall be processed according to Figure 10. The upper and lower surfaces of the test specimen shall be machined to be flush with the parent material surface. The tensile surface of the specimen is allowed to be chamfered 1 to 2 mm on both sides. When the thickness of the test plate is greater than 40 mm, it can be divided into several 20 to 40 mm specimens for separate tests: i—specimen thickness, 10 mm
4.3.3.6 The weld punching specimen should be Charpy V-shaped notch II, and its shape and size should be processed according to the requirements of Figure 11 and Table 4. @
W.
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