GB/T 16957-1997 Test method for mechanical properties of welded joints of composite steel plates
Some standard content:
ICS 25. 160. 40
National Standard of the People's Republic of China
GB/T 16957
Mechanical properties of welded joints of clad steel plates
Test methods
Mechanical tests on welded joints in clad plates1997-08-27Promulgated
State Administration of Technical Supervision
1998-06-01Implementation
WGB/T16957—1997
As a new material, clad steel plates have been gradually used in many fields such as pressure vessels, nuclear reactors, storage tanks and shipbuilding. In the process of using clad steel plates, welding is indispensable. This standard specifies four mechanical properties test pieces of tension, bending, impact and hardness of clad steel plate welded joints. This test method can be used for the evaluation of clad steel plate welding process, the welding test plate test of products, and the welding test. This standard was proposed by China Shipbuilding Industry Corporation and was developed by the Harbin Welding Research Institute. The originating units of this standard are Dalian Shipbuilding and China Shipbuilding Industry Corporation Comprehensive Technical and Economic Research Institute. The main drafters of this standard are Dian Jianche, Wu Jing, An Lizhao, Du Yuansong and Wang Aijun. ww.bzsoso：comScope
National Standard of the People's Republic of China
Mechanical tests on welded joints in clad steel plates
Test methods
Mechanical tests on welded joints in clad steel plates This standard specifies the tensile, bending, impact and strength test methods for welded joints of clad steel plates. GB/T 16957-1997
This standard is applicable to the mechanical property test of welded joints of single-sided and double-sided clad steel plates (hereinafter referred to as clad joints) made of rolled, blasted, clad, etc., blast-proof, clad, converted and cast steel plates with a total thickness of 8 mm or more, which are used for pressure vessels, nuclear reactors, and other applications. It can also be used as a reference for the mechanical property test of clad steel plates and other metallurgical plates with a total thickness of less than 8 mm and their sub-plates. 2 Reference standards The following standards contain provisions that are applicable to the provisions of this standard when cited in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest version of the following standards. GB150-89 Steel presses CB228-87 Metal tensile test methods GB/T 229-94 Metal Charpy notch impact test methods B232-88 Metal bending test methods GR2649~2655-89 Mechanical properties test methods for welded joints GB 4340-84 Metal Vickers hardness test methods GB/T 6396-1995 Test methods for mechanical and process properties of composite plates GB6397-R7 Metal tensile test methods and preparation of metal composite plate welding technical conditions GB/T 13147—91
GB/T 13148---91
Uncorrected composite board welding technology box parts
GB/T13119-1 Missing and marking metal alloy steel lifting technical conditions JJG 13995
Verification procedures for tensile and compressive material testing machines Verification procedures for pendulum impact testing machines
G 145-82
JJG 151--91
Verification procedures for JIG hardness tester
JG157BF Verification procedures for small negative material testing machines JIG 475—86 Verification procedures for electronic universal material testing machines 3 Text
This standard adopts the following definitions.
3.1 Clad plales
Clad metal plates with steel as base material.
32 Base metal
Approved by the State Administration of Technical Supervision on 1997-08-27 and implemented on 1998-06-01
WCR/T 16957-1997
Base material in clad metal, with a thickness of 0.1%. 3.3 Ladding metal
Ladding material in clad metal.
3. Composite ratio Clad plates
The ratio of the thickness of the dense material to the thickness of the base material of the clad plates. 3.5 Total thickness of clad plates The sum of the thickness of the base material and the cladding material of the clad plates. 3.6 Rolled clad plates Cladding plates with base material and clad material metallurgically bonded by rolling. Explosive clad steel 3.7
Combined steel plates with base material and cladding material produced by blasting welding. 3.8 Overlaying clad plates Composite steel plates with cladding material produced by cladding welding on base material. 3.9 Casting clad plates Composite steel plates with metallurgical bonding between base material and cladding material produced by casting. 3.10 Explosive rolling clad plates Composite steel plates obtained by rolling explosive clad steel. 3.11 Verlaying rolling clad plates Composite steel plates obtained by rolling clad welding clad steel. 3.12 Casting rolling clad plates Composite steel plates obtained by rolling casting clad steel. 3.13 Single-sided clad plates Composite steel plates with base material and cladding material on one side.
3.14 Double-sided composite steel plates Composite steel plates with cladding materials on both sides of the substrate.
3.15 Face bent test Bend test in which the material is located on the tensile surface of the bend. 3.16 Inner bend test Bend test in which the material is located on the compressive surface of the bend. 3.17 Side bend test Bend test in which the specimen and the substrate are in the same bending state. 4 Special numbers
Symbols and names are shown in the table! .
Table 1 Symbol, Name
Total surface roughness of composite plate
Glossiness of composite plate substrate
Flatness of composite plate filling
Substrate roughness of sample
Surface roughness of test piece
Itchiness of sample
W5 test
Sample
Test bar diameter
Sample length
GB/T16957
Table 1( 5.1 The size of the test plate and the loading of the sample are shown in Figure 1. 400 mm or 400 mm. Figure 1 Welding test plate size and sampling position. 5.2 The test plate welding should be visually inspected and non-destructive testing should be carried out. Then the sample should be cut from the qualified position. 5.3 The length of the discarded part at both ends of the test plate should not be less than 50 mm for F1 welding and not less than 40 mm for dynamic welding. For the test plate with bottle plate and lead-out plate, the discarded part at both ends can be less or not discarded. 5.4 The sample should be cut from the test plate by mechanical processing method. If the heat processing method such as plasma cutting is used, the engineer must remove the heat affected zone.
6 Tensile test
6.1 Test specimens
6.1.1 Tensile specimens are divided into two types: joint tensile specimens and weld metal tensile specimens. The sampling method shall be in accordance with GL/T[3147GB/T13148, (B/T13149 and GB150 Appendix G or relevant technical specifications: 6.1.2 Joint tensile specimens are divided into two types: one is the base material specimen with the base material and transition layer removed, the specimen thickness α=1+, the other is the specimen with the covering material, the specimen thickness 4=,.
6.1. 3 The tensile test specimen of the joint is generally a shaped cut specimen. The processing requirements can be implemented according to GB2651. The specific dimensions are shown in Figure 2. The width of the specimen b225mm, the length of the specimen L and the length of the head part 1 should be determined according to the needs, 4 generally should exceed 2/3 of the height of the clamp jaws. The excess height of the weld of the specimen should be machined to be flush with the parent material, and the upper direction should be in the direction of the length of the specimen. 5
W. Meeting
G5/T16957--1997
Figure 2 Tensile test of welded jointsbzxZ.net
6.1.4 For the specimens containing thin materials, full thickness specimens shall be used. When the total thickness of the composite steel plate T,>40mm, and the testing machine capacity is insufficient, the base material and the cladding material can be machined according to the composite ratio to make the thickness Q≤4Dmm, but the short material thickness of the specimen T,23mmt should be ensured. When T,≤a, only the base material thickness T is machined to be thinned. 6.1.5 For the specimens of pure base material, full base material thickness specimens shall be used. When the base material thickness Th of the composite steel plate is greater than 10mm, and the testing machine capacity is insufficient, sampling can be carried out according to GIB 2649 and GB 2651. 6.1.6 The weld metal drawing sample shall be taken from the seam of the composite steel plate base material. The sample shall be taken according to GB2649 in terms of orientation and method. The sample shall be sampled according to the requirements of sample number R1~R3 in GB639T, and the sample diameter d shall be as large as possible. 6.2 Test equipment and test conditions
The test equipment should be regularly checked by JJG139, JG157 and JJG475. The test conditions should be in accordance with the relevant provisions of GB228. 6.3 Test method
The test method should be carried out in accordance with the provisions of GB228, GB2651 and GB2652. The test items should be determined in accordance with the relevant standards and technical conditions. 6.4 Test result processing
Various stress and strength gauges should be divided by their corresponding test force by the original total transverse drum area of the sample. The calculation of their parameters should be in accordance with GB22 regulations: 6.5 Test report
The test report should generally include the following contents:
a) This standard number:
6) Sample marking (such as material specifications, material site, sample code):
d) Test results
d) Fracture position and defects.
7 Bend test
Bend test includes external bend, internal bend and camber bend test. 7.1 Tests
7.1.1 The shape and size of the external bend and internal bend test specimens are as shown in Figure 3, except that the overall design shall be in accordance with G13 2653. The other dimensions shall be in accordance with the relevant standards and technical specifications.
Concept
GB/T 169571997
3 External and internal bend test
7.1.2 When the total thickness of the steel plate is T>um, and the testing machine capacity is not sufficient, for the internal bend test specimen, it can be machined from one side of the material to α=20 mm; for the external bend test, it can be machined from the base material to α=20 mm; when the testing machine capacity is sufficient, the full thickness test can be used. The residual height of the welded joint shall be machined to be flush with the parent material, and its surface roughness is K, 12.5 μm. The machining direction shall be parallel to the length of the specimen. 7.1.3 For double-layer composite steel plates, when the test machine capacity is not limited to 20 mm, the test machine can reduce the length to #21 mm, one of which is kept as a continuous material, and the other is kept as a continuous material. When the test machine capacity allows, the original specimen can be used for testing. The residual height of the welded joint of the specimen shall be machined to be flush with the parent material, and its surface roughness is R, 12.5 μm. The length direction of the specimen shall be
7.1.4 The number of side bending specimens shall be in accordance with the relevant standards and technical conditions. The shape and size of the specimens are shown in the figure. The requirements are in accordance with G12653. The width of the specimen is B-T. When the total thickness of the composite steel plate is ≥10mm, multiple composite test pieces can be used as the full-sequence test pieces. For double-sided composite steel plates, two test pieces are taken from each group, one is machined from the top material of the surface, and the other is machined from the other material. Thinned to 40mm,
Figure 4 Bend test
7.2 Test equipment and test conditions
7.2.1 Bend test is carried out on a mechanical tester or a material testing machine. 7.2.2 The distance between the test machine arms should be adjustable, the arms should have sufficient clearance, their length should be greater than the width of the test piece, and the sides should be parallel.
7.2.3 The test machine should have cores of different diameters, and the cores should have sufficient length, strength and hardness. 7.3 Test methods
7.3.1 The test methods for external bending, internal bending and side bending shall be in accordance with GB 232, GB 2653 and GB/T 6396. The isocentric straightness and bend tolerance shall be in accordance with the relevant standards and technical requirements. The determination principles are as follows: the external bending shall be in accordance with the requirements of the material joint, the internal bending shall be in accordance with the requirements of the base material welding joint, and the side bending shall be in accordance with the material with the lower requirement between the active material and the receiving material. 7.3.2 Both groups of test pieces of double-sided composite steel plates shall be subjected to external bending tests. 7.3.3 The total thickness of the effective steel plate shall be 10 mm. The side can be used to replace the external wear and internal change test. 7.4 Test result evaluation
7.4.1 "External and internal changes and test results and complex requirements. According to the relevant standards and technical requirements, the period of interruption, scattered danger and tensile surface of the good chain of the opening process change
7.4.2 The following situations occur during the test. The test results are as follows. a) Improper selection:
b) Due to the selection of the core or the setting of various obstacles, etc. 7.4.3 In case of test results, the same number of test samples should be added for testing. W.7.5 Test report
The test report generally includes the following contents:
a) This standard number;
GB/T 16957—1997
b) Sample marking (such as material specifications, material, sample code, etc.); c) Test type (external bending, internal bending and side bending); d) Test results (the direction, length, quantity and location of the cracks should be indicated). 8 Hardness test
8.1 Sample
8.1.1 The test piece should be taken from the cross section of the composite steel plate welding joint. The specific size should be determined according to the needs and test conditions. 8.1.2 The surface of the sample to be tested should be smooth. After polishing, its roughness should not be greater than R, 0.1um. 8.1.3 The surface of the polished sample should be corroded with the corresponding Then, to show the boundary lines of the obtained material, transition layer (if any) and base material, seam metal, heat affected zone, etc. 8.1.4 Other requirements for the test specimen shall be in accordance with GB1340. 8.2 Test equipment and test conditions
The test equipment shall be regularly calibrated in accordance with JJG151 standard. The test conditions shall be in accordance with the relevant provisions of GB4340. 8.3 Test method
8.3.1 The test method shall be in accordance with GB1340 and GBT6396. 8.3.2 The test shall be carried out in accordance with the requirements of relevant standards. Determine the hardness of different areas of the material, transition layer and base material. The "area city test shall not be less than 3 points.
8.3.3 If there is no specific requirement for the test force, the test force can be selected as 98.07N. B.4 Test result processing
The test results shall be processed in accordance with GB4340.
8.5 Test report
The test report shall generally include the following contents: Standard!
h) Sample marking (such as material specifications, material, sample code, etc.): c) Test results (including test symbols, hardness values in different areas and schematic diagrams, etc.), 9 Impact test
9.1 Sample
9.1.1 The notch of the impact test specimen shall be in accordance with GB/T13147, (B/T13148, GB/T13149GH150-89 Appendix G and relevant technical requirements, and shall be taken from the center of the stove seam, the fusion line, the heat-affected zone and the parent material, as shown in Figure 5. The processing requirements of the impact test specimen shall be in accordance with GB/T 229 Regulations.
9.1.2 The number of samples taken from each part is three in a group. 9.1.3 The impact specimen should be sampled on the side close to the surface of the composite steel plate in the thickness direction of the test plate, and the upper surface of the specimen should be 2M away from the surface of the base material. For the specimen taken from the center of the weld, the transition layer is not allowed. When it is impossible to intercept the standard specimen, an auxiliary small-sized specimen can be intercepted. If there are special requirements, the impact specimen can be taken from other parts in the thickness direction. 9.1.4 The axis of the impact test specimen should be in the welding direction, and the axis of the specimen notch should be perpendicular to the surface of the test plate. 9.1.5 The notch type of the impact test specimen should be determined according to the relevant standards, and is generally consistent with the notch type of the base material impact test. G
9.2 Test equipment and test conditions
GB/T 169571997
(a) Center of weld
(b) Fusion line
(e) Heat affected zone
Figure 5 Location of impact specimen notch on weld The test equipment should be regularly calibrated according to JJG115 standard. The test conditions should comply with the relevant provisions of GB/T229. 9.3 Verification method
9.3.1 The test should comply with the provisions of GI3/T229. For high and low temperature impact tests, the temperature measuring instrument should not only meet the requirements of GB/I229, but also have a verification certificate.
9.3.2 The test temperature should be determined according to the requirements of relevant standards or material standards. 9.4 Processing of test results
The test results should be processed according to the relevant provisions of G13/T229. 9.5 Test report
The test report should generally include the following contents: a) This standard number:
) Specimen marking (such as material specifications, material, specimen code, test position, etc.);
d) Test results;
e) If necessary, the position of the specimen in the thickness direction. .
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