Some standard content:
Part II Construction Process Engineering Inspection Method Standard 5.8.6 The tensile test results of three specimens of embedded steel bar T-joints shall meet the following requirements: a. The tensile strength of Class I steel bar joints shall not be less than 350MPa; b. The tensile strength of Class II steel bar joints shall not be less than 490MPa. When the tensile strength of one specimen is less than the specified value in the test results, 6 more specimens shall be taken for re-testing. In the re-test results, when the tensile strength of one specimen is still less than the specified value, it shall be confirmed that the batch of joints is unqualified. For unqualified products, after reinforcement welding, they can be submitted for secondary acceptance. 2. "Test Methods for Steel Bar Welded Joints" JGI27-86 Chapter 1 General Provisions
Article 1.0.1 This standard applies to the basic performance tests and special performance tests of steel bar welded joints in reinforced concrete and prestressed concrete structures of industrial and civil buildings and structures. Article 1.0.2 The basic performance test methods of steel bar welded joints include tensile test, shear test and bending test. When the above basic performance tests are carried out on steel bar welded joints or welded products during quality acceptance, the sampling method, number of test pieces, quality requirements for test piece appearance inspection and quality requirements for mechanical performance tests shall all comply with the relevant provisions of JGJ18-84 "Steel Bar Welding and Acceptance Regulations".
Article 1.0.3 Special performance test methods for steel bar welded joints include impact test, fatigue test, hardness test and metallographic test. When carrying out the above special performance tests, all contents related to this standard but not specified in this standard shall comply with other relevant provisions.
Article 1.0.4 Various tests on steel bar welded joints shall generally be carried out at room temperature (10-35°C); if there are special requirements, they may also be carried out at other temperatures according to relevant regulations. Article 1.0.5 Various instruments and equipment used in the test shall be calibrated regularly according to relevant standards and technical conditions to ensure accuracy requirements.
Chapter 2 Basic Performance Test Methods
Section 1 Tensile Test
Article 2.1.1 Scope of Application
This method is applicable to the static tensile test of cold-drawn low-carbon steel wire resistance spot welding and steel bar flash butt welding, arc welding, electroslag pressure welding, and embedded arc pressure welding of embedded parts at room temperature. The purpose of the test is to determine the tensile strength of the welded joint, observe the fracture position and fracture morphology, and determine plastic fracture or brittle fracture.
Article 2.1.2 Test Pieces
The dimensions of the tensile test pieces of steel bar resistance spot welding, flash butt welding, arc welding, electroslag pressure welding and submerged arc pressure welding welded joints shall comply with the provisions of Table 2.1.2.
Welding method
Resistance spot welding
Flash butt welding
Double-sided bar welding
Single-sided bar welding
Double-sided lap
Single-sided lap welding
Groove bar welding
Groove welding
5. Inspection of steel bar welding construction process
Joint type
Test piece size
8d + thWww.bzxZ.net
5d +lh
ts+21;
ts+2t;
2. +21,
t,+2t,
1,+2t,
2a+21;
1,+21,
Note: 1.
Part 2
Standard for Construction Process Engineering Inspection Method
Welding Method
Electroslag Pressure Welding
Pre-embedded T-joint
Test Length;
T h-~——weld length;
—clamping length (100～120mm);
test piece length:
d-—steel bar diameter
Article 2.1.3 Test equipment
Joint type
Test piece size
to+21;
1. According to the grade and diameter of the steel bar, select the appropriate type of tensile testing machine or universal testing machine. The testing machine should comply with the relevant provisions of GB228-76 "Metal Tensile Test Method". 2. Before the test, a clamping device suitable for the specimen specifications should be selected. It is required that the clamping device always clamps the steel bar during the stretching process and does not produce relative slip between the steel bar. 3. The hanger for the tensile test of the embedded T-joint is shown in Figure 2.1.3. Before the test, clamp the pull rod in the upper fixture of the testing machine, pass the steel bar of the test piece through the slots of the pad and bottom plate in the hanger, put it in the center of the hanger, and clamp it in the lower fixture of the testing machine. 30
Figure 2.1.3a Embedded T
Tensile test hanger
1-pad; 2-bottom plate
Figure 2.1.3b Pad
Article 2.1.4 Test method
1. Before the test, the diameter of the steel bar and the thickness of the steel plate should be checked with a vernier caliper.
2. Clamp the test piece on the testing machine, and the load should be continuous and stable without impact or jumping. The loading speed is 10~30MPa/s until the test piece is pulled apart (or necking occurs).
3. The following data should be recorded during the test:
1. Steel bar grade and nominal diameter;
2. Maximum load P before the specimen breaks (or necks);
3. Fracture (or necking) position, and distance from the weld;
4. Fracture characteristics (plastic fracture or brittle fracture), or whether there is necking.
If welding defects such as pores, slag inclusions, incomplete penetration, and burns are found on the fracture of the specimen, they should be noted in the test report.
Article 2.1.5 Calculation of test results and test report 1. The tensile strength of the specimen is calculated according to the following formula: P
Where a—
-tensile strength of the specimen (MPa);
Pb——maximum load before the specimen breaks (N); Fo—--nominal cross-sectional area of the specimen (mm2). V. Inspection of steel bar welding construction process
Top 928
Technical requirements:
Other 63
(1) All chamfers 2×45°
(2) All welds are fully welded
Figure 2.1.3c Hanger
1-Pull rod; 2-Force transfer plate; 3-Force transfer rod; 4-Bottom plate II. During the test, if the test data is not accurate due to improper operation (such as specimen clamp deviation) or failure of the test equipment, the test results will be invalid.
III. For the test report format, see Appendix III, Table 3.1. Section II Shear test
Article 2.2.1 Scope of application
This method is applicable to the room temperature shear test of cold-drawn low-carbon steel wire resistance spot welding skeleton and mesh welding points of steel bars. The purpose of the test is to determine the maximum shear force that the welding point can withstand. Article 2.2.2 Test piece
1. The form and size of the shear test piece of the steel bar weld point shall comply with the regulations. 2. The two cross steel bars of the shear test piece shall be perpendicular to each other. 3. When the size of the test piece cut from the finished product cannot meet the test requirements, or the diameter of the stressed steel bar is greater than 8mm, the test mesh can be welded under the same conditions during the production process, and the test piece can be cut from it. 1592
Part II Construction Process Engineering Testing Method Standard Article 2.2.3 Test Equipment
1. For shear test, a universal testing machine of 300kN or less should be used, and the force indication error shall not be greater than ±1%.
The shear clamp has two types: hanging clamp and hanger type conical clamp; when testing, it can be selected according to specific conditions.
2. The hanging clamp consists of a left clamp and a right clamp. The processing dimensions and requirements are shown in Figure 2.2.3a. The right clamp is one piece; the left clamp has three pieces, each with different longitudinal groove sizes (see Table 2.2.3), which are suitable for longitudinal steel bars of different diameters. Technical requirements: (1) Surface roughness: 63
(2) Material: 45
The left and right clamps each have three √-shaped transverse grooves of different depths, with helical teeth in the grooves (3) Heat treatment HRC48°~-52°, which are suitable for transverse steel bars of different diameters. The hanging clamp is mainly used for WE-10B universal testing machine. Left clamp longitudinal groove size
Longitudinal groove size
Figure 2.2.3a
Hanging clamp
Applicable to longitudinal steel bar diameter
3. The hanging conical clamp consists of a hanger and a conical clamp. The hanger structure is shown in Figure 2.1.3c. The conical clamp consists of a left clamp, a right clamp and an anchor ring, see Figure 2.2.36. The right clamp is one piece; the left clamp has three pieces, each with a different longitudinal groove size (see Table 2.2.3). The left and right clamps each have three V-shaped transverse grooves of different depths. The clamp structure is shown in Figure 2.2.3c. 12:5
Others ""
Technical requirements:
(1) Blunt edges and corners
(2) Heat treatment HRC48~52°
Figure 2.2.36 Conical clamp
Figure 2.2.3c Clamp
Section 2.2.4 test methods
V. Inspection of steel bar welding construction process
19°±6”
1. According to the size of the specimen and the equipment conditions, select a suitable clamp, place it in the upper jaw of the universal testing machine, and clamp it. Clamp the transverse reinforcement of the specimen in the transverse groove of the clamp, and clamp the longitudinal reinforcement in the lower jaw of the universal testing machine through the longitudinal groove.2. When the diameters of the two cross steel bars are different, the thicker steel bar should be used as the transverse reinforcement, clamp it, and do not rotate. The tensile force of the longitudinal reinforcement should coincide with the loading axis of the testing machine.
3. Before starting the testing machine, the loading should be continuous and stable, without impact and jumping. The loading speed is 10~30MPa/s until the specimen is destroyed. Read the maximum load value indicated by the pointer on the dial, which is The shear resistance of the specimen. 4. During the test, if the accuracy of the test data is affected by improper operation or failure of the test equipment, the test results will be invalid. Article 2.2.5 Test report
1. At the end of the test, the specimen number, steel grade, diameter, shear resistance of the specimen, fracture position, etc. should be filled in the test report. 2. For the test report format, see Appendix III, Table 3.1. Section 3 Bending Test
Article 2.3.1 Scope of Application
This method is applicable to the room temperature bending test of steel bar flash butt welded joints. 2×451
Heat treatment hardness HRC32~37
Figure 2.2.3d Anchor ring
The purpose of the test is to inspect the bending deformation performance of the steel bar welded joint and the possible existence of the weld Connection defects. Article 2.3.2 Test piece
1. The length of the bending test piece of the steel bar welded joint depends on the grade and diameter of the steel bar, which is generally the inner distance of the two rollers plus 150mm. The inner distance of the two rollers is the diameter of the bend center plus 2.5 times the diameter of the steel bar, see Figure 2.3.2 and Appendix 4, Table 4.1.
2. The metal burrs and upsetting deformation parts on the pressure surface of the test piece can be processed with tools such as grinding wheels to make them flush with the surface of the parent material, and the remaining parts can be kept in the post-weld state (i.e. welded state). Article 2.3.3 Test equipment
The bending test should be carried out on a universal testing machine, and can also be carried out on a manual hydraulic bending tester. The structural schematic of the manual hydraulic bending tester is shown in Figure 2.3.3. D+2.5d
Figure 2.3.2 Schematic diagram of bending test
Figure 2.3.3 Manual hydraulic bending tester
1-adjusting nut; 2-support roller; 3-hydraulic jack; 4-frame; 5-pressure head; 6-pressure head seat
Part II Construction process Engineering inspection method standard Article 2.3.4 Test method
1. When conducting a bending test, the test piece should be placed on two fulcrums and the center line of the weld should be consistent with the center line of the pressure head. During the test, pressure should be applied to the test piece steadily. Until the specified bending angle is reached. 2. The specified pressure head bending core diameter and bending angle of the steel bar flash butt welding joint are shown in Table 2.3.4. In order to reduce the specifications of the pressure head, its bending core diameter can be selected in accordance with Appendix 4, Appendix 4.1 in actual use. Table 2.3.4
Note: d is the steel bar diameter.
Rebar grade
Bending core diameter (D)
d>25(mm)
d≤25(mm)
3. During the test, safety measures should be taken to prevent the specimen from breaking suddenly and injuring people. Bending angle (degrees)
4. If bending tests are required for steel bar electroslag pressure welding joints and steel bar groove arc welding joints, the test methods and test requirements can refer to the bending tests of steel bar flash butt welding joints. Article 2.3.5 Test report
1. After the bending test, the tensile surface of the specimen should be checked for cracks and filled in the test report. 2. If the specimen breaks during the test, the bending angle, fracture position and fracture morphology at the time of fracture should be recorded. If welding defects such as lack of fusion are found, they should be noted in the test report. 3. For the test report format, see Appendix III, Table 3.1. Chapter 3 Special Performance Test Methods
Section 1 Impact Test
Article 3.1.1 Scope of Application
This method is applicable to Charpy impact test of welded joints such as flash butt welding, arc welding, and electroslag pressure welding of steel bars. The purpose of the test is to determine the impact absorption energy or impact toughness value of each part of the welded joint. Article 3.1.2 Specimen
1. The specimen shall be cut at the center of the cross section of the steel bar, and the deviation between the center line of the specimen and the center line of the steel bar shall not exceed 1mm. The location and notch orientation of the specimen cut in various welded joints are shown in Table 3.1.2. 2. The types and sizes of the specimens are divided into four types, as shown in Figures 3.1.2a to 3.1.2d, among which: Figure a is a 10mm×10mm×55mm U-shaped notch specimen with a depth of 2mm, and Figure b is a 10mm×10mm×55mm V-shaped notch specimen with a depth of 2mm, both of which are Charpy standard specimens. Figures c and d are Charpy non-standard specimens. 3. The sample should be cut by mechanical method or gas cutting. In addition to considering the processing allowance, it is also necessary to ensure that the heat affected zone caused by gas cutting is not left on the sample to avoid affecting the impact performance of the sample. The number of samples taken from the same part under the same test conditions should be no less than 3. Before notching the sample, the weld should be clearly displayed with an etchant, and then the line should be drawn as required. When processing the notch, the impact performance of the sample should not be affected by heat. 4. The samples should be numbered one by one, and the cross-sectional dimensions at the bottom of the notch should be accurately measured and recorded. - Welding
Flash butt welding
Electric pressure welding
Arc groove welding
Fusion line
Note: The distance t between the axis of the notch and the fusion line of the sample is 2 to 3 mm. 55±0.6
27.5±0.3
Figure 3.1.2a
R0.25±0.025
22.5±22.5±1
Figure 3.1.26
V. Inspection of steel bar welding construction process
Gap position
27.5±0.3
Plain round steel bar
Figure 3. 1.2c
27.5±0.30
Deformed steel bar
R0.25±0.025
22.5±22.5±1
Figure 3.1.2d
Part II Construction process Engineering detection method standard Article 3.1.3 Test equipment
1. A 150J or 300J pendulum impact tester should be used during the test. 2. The normal use range of the tester is 10%-90% of the maximum impact energy of the pendulum used. The scale division accuracy of the tester should not be less than 5% of the maximum impact energy of the pendulum.
3. The dimensions of the tester specimen support and pendulum blade should comply with the specifications of Figure 3.1.3 R2-2.5
4. A sample gauge should be set to ensure that the center line of the specimen notch is aligned with the span center of the two supports of the tester and does not affect the free deformation of the specimen when it is impacted. R1-1
5. The swing plane of the pendulum of the testing machine must be vertical, and the striking center should coincide with the impact point of the pendulum.
6. Before the test, check whether the pendulum is pointing to zero (before the pendulum is raised for empty striking, the passive pointer should indicate zero. When the pendulum is hanging freely, make the passive pointer close to the active pointer and align it with the maximum impact energy), and its deviation should not exceed one-fourth of the minimum scale value. Article 3.1.4 Test conditions and test methods
1. The impact test can be carried out at room temperature or negative temperature. The test temperature at room temperature is generally 10~35℃, and when the requirements are strict, it is (23±5)℃. The negative temperature test temperature includes: (0±2)℃, (10±2)℃, (-20±2)℃, (-30±2)℃, (-40±2)℃, etc., which are determined according to actual needs. The test temperature refers to the temperature of the bottom surface of the notch of the specimen at the moment when the pendulum contacts the specimen.
2. The sample can be cooled in a refrigerator or a cooling box containing a coolant. 3. A mixture of ice and alcohol should be used as the coolant; explosive liquid oxygen, industrial liquid nitrogen with an oxygen content greater than 10%, or liquid air should not be used as the coolant. When mixing dry ice and alcohol, stir them to ensure that the coolant temperature is uniform.
4. The thermometer used in the cooling box should not have a value greater than 1°C per division, and its accuracy should be 0.5%. If a thermocouple thermometer is used, the thermocouple point should be placed in the notch of the temperature-controlled sample. At this time, the temperature-controlled sample should be placed in the cooling box at the same time as the test sample.
5. The temperature in the refrigerator or cooling box should be lower than the specified test temperature, and its supercooling should be determined by testing according to actual conditions. If the time from taking out the sample from the box to the time when the pendulum hits the sample is 2 to 5 seconds, the room temperature is (20±5)℃, and the test temperature is 0 to -40℃, a supercooling value of 1 to 2℃ can be used. 6. The tool for clamping the sample should be cooled at the same time as the sample. The samples should be placed at a certain distance in the refrigerator or cooling box. After the temperature in the refrigerator or cooling box reaches the specified temperature (i.e. the test temperature plus the supercooling value), it should be maintained for a certain time; the time is: in liquid, not less than 5 minutes; in gas, not less than 15 minutes. 7. During the test, the sample should be placed securely on the support, and the center line of the sample notch should be aligned with the center of the support span. The back of the specimen notch faces the pendulum, and the deviation between the pendulum blade and the center line of the specimen notch should not exceed ±0.2mm. Loosen the suspended pendulum, impact the specimen, and record the dial pointer indication. 8. After the specimen is broken, the fracture should be checked. If there are defects such as pores, slag inclusions, cracks, etc., they should be recorded. Article 3.1.5 Test Report
1. The impact absorption energy A when the specimen is broken can be read directly from the dial of the testing machine, and the unit is J. U-notch specimens are represented by Aku;
V-notch specimens are represented by A.
2. The impact toughness value ak is calculated according to the following formula: In the formula, αk-—the impact toughness value of the specimen (J/cm2); Ak
5. Inspection of steel bar welding construction process
F-—the cross-sectional area at the bottom of the specimen notch before the test (cm2). 3. The test report should record the following contents: 1. 1. Welding method, specimen type and sampling location; 2. Test temperature;
3. Impact absorption energy or impact toughness value of the specimen; 4. Defects found on the fracture;
5. If the specimen is not broken, it should be marked as "not broken". IV. See Appendix III, Table 3.2 for the test report format. Section 2 Fatigue Test
Article 3.2.1 Scope of Application
This method is applicable to axial tensile fatigue tests of steel bar welded joints at room temperature. 1597
The purpose of the test is to determine and test the conditional fatigue limit of steel bar welded joints under a certain stress ratio and stress cycle number. Stress cycles are shown in Figure 3.2.1.
Article 3.2.2 Test Specimen
The length of the test specimen shall generally not be less than the sum of the fatigue test area (including weld and parent material) and the two clamping lengths; among them, the length of the test area should not be less than 500mm (see Figure 3.2.2). -1 stress cycle-
Figure 3.2.1 Axial tensile fatigue stress cycle
amax—maximum stress; αmin—minimum stress; am——average stress; 一stress amplitude: 2g 一stress range
Figure 3.2.2 Fatigue specimen of steel bar welded joint
l—test length; lh—weld length; t,—central holding length; main—specimen length; &—drug diameter
When the testing machine cannot adapt to the above specimen length, the actual length of the specimen should be indicated in the report. The length of the high-frequency fatigue specimen is determined according to the specific conditions of the testing machine. 2. The appearance of the specimen should be carefully inspected, and there should be no welding defects such as pores, burns, crushing, and undercuts. The center line of the specimen should be in a straight line.
3. To avoid the specimen from breaking at the clamping part, the following measures can be taken for the clamping part: 1. Cold work strengthening treatment is carried out on the clamping part; 2. Lanthanum mold sleeves suitable for the shape of the steel bar are used; Part II Construction Process Engineering Inspection Method Standard 1598
3. Steel mold sleeves with annular inner grooves suitable for the diameter of the steel bar are used and poured with epoxy resin. Article 3.2.3 Test equipment and test conditions
1. The axial fatigue testing machine used shall meet the following requirements: 1. The static load indication error of the testing machine shall not exceed 1%; 2. Within 10 hours of continuous testing, the load amplitude indication fluctuation shall not exceed 2% of the full range of the load used; 3. The testing machine shall have safety control and automatic recording of stress cycle numbers. 2. During the entire test period of a specimen, the maximum and minimum fatigue loads and cycle frequency shall remain constant. The accidental change of fatigue load shall not exceed 5% of the initial value, and its time shall not exceed 2% of the number of cycles of a specimen. 3. The stress cycle frequency depends on the type of testing machine used, the stiffness of the specimen and the test requirements. The selected frequency shall not cause the tested part of the specimen to heat up. The frequency of low-frequency fatigue test should be 5~15Hz; the frequency of high-frequency fatigue test should be 100150Hz.
The test of the same batch of specimens should be carried out at approximately the same frequency. Article 3.2.4 Test method
1. Clamp the ends of the specimen firmly in the upper and lower clamps of the testing machine. The center line of the clamp should coincide with the load axis of the testing machine to ensure accurate transmission of fatigue load along the center line of the specimen. 3. Determine the maximum and minimum loads of the test according to the mechanical properties, specifications and use requirements of the steel bars. The increase in load should be carried out slowly. If the load fluctuates at the beginning of the test, it should be adjusted in time until it stabilizes. 3. The fatigue test should be carried out continuously. If there is a pause in the middle, it shall not exceed three times; the total pause time shall not exceed 10% of the total time, and it shall be noted in the test report. 4. When the specimen is damaged, the fracture position, distance from the end of the clamp and the number of test cycles should be recorded in time. At the same time, carefully check the fracture and draw a picture to describe the fracture morphology. When the specimen fracture occurs in the clamping part, or the distance from the end of the clamp (or die sleeve) is less than one times the diameter of the steel bar, the test result is invalid.
5. When conducting a proof fatigue test, at least three specimens should be tested at the required fatigue stress level and stress ratio to determine their fatigue life N value. 6. The number of cycles of the conditional fatigue limit is stipulated as follows: 105, 2×105, 5×105, 106, 2×10%, 5×10%, 107; 2×10% can generally be used. 7. Determination of conditional fatigue limit
Fatigue test results are generally expressed by graphical method. The SN curve is the most commonly used method for expressing fatigue test results. By drawing the SN curve and combining mathematical statistics, the conditional fatigue limit value can be obtained. When conducting fatigue tests, under the condition of determining the stress ratio R (in prestressed concrete structures, the R of the steel bar can generally be 0.7 or 0.8; in non-prestressed concrete structures, the R of the steel bar can be 0.2 or 0.1), change the stress max and Omin, starting from the high stress level, and gradually decreasing, taking 1 to 3 specimens at each level, and conducting the test in stages, and finally obtaining the relationship between amax and N. Through regression analysis, the accurate statistical value is obtained, the SN. curve is drawn, and the conditional fatigue limit that reaches the specified fatigue life N under the given stress ratio R is obtained (see Figure 3.2.4). The formula and calculation examples are shown in Appendix V.
Article 3.2.5 Test Report
During the fatigue test of steel bar welded joints, various original records should be recorded in time, and a test report should be submitted after the test is completed. The original record table and test report template of the test are shown in Appendix III, Appendix 3.3 and Appendix 3.4. Section 3 Hardness Test
Article 3.3.1 Scope of Application
This method is applicable to the room temperature hardness test of each area of the steel bar welding joint (including weld, fusion zone, heat affected zone and parent material). The purpose of the test is to understand the hardness difference and change of each area.
The test equipment can generally use Vickers hardness tester. Article 3.3.2 Test Specimen
V. Inspection of Steel Bar Welding Construction Process
1. The test surface of the specimen should be a smooth plane, without 220 scale and other dirt. The roughness of the test surface must ensure that the indentation diagonal can be accurately measured, and generally not less than 0.22. 2. During the preparation of the specimen, the influence of heating or cold working on the hardness of the test surface should be avoided. 3. The specimen should generally include all areas of the welded joint; but according to specific requirements, a certain area can also be intercepted to make a hardness specimen.
1.5×1053×10'5×105
2×105
○Broken in the heat affected zone, or the weld root
0Broken in the steel mold sleeve, invalid
O-More than two million times, not broken
Fatigue life N times
2×106
Figure 3.2.4 SN curve of fatigue test of steel bar welded joint 4. The hardness test of steel bar welded joint can also be carried out on the metallographic specimen, and its test surface must be parallel to the supporting surface. Article 3.3.3 Test equipment
1. The hardness tester should be installed on a stable foundation and adjusted to a horizontal level. The test environment should be clean, vibration-free, and free of corrosive gases around.
2. When using a Vickers hardness tester, each time the pressure head, test bench or support is replaced, it should be in accordance with JJG151--83 "Metal Vickers Hardness Tester Verification Procedure",Check the hardness tester. 3. When using a micro Vickers hardness tester, each time the indenter, test bench or support is replaced, the hardness tester should be checked in accordance with JJG260--81 "Micro Hardness Tester Verification Procedure". 4. When the tip or edge of the diamond indenter is defective, or when other main parts are found to be abnormal, it must be replaced. Article 3.3.4 Test method
, When conducting a Vickers hardness test, press the diamond pyramid indenter into the surface of the sample with the corresponding test force (49.03~980.7N). The test force is divided into six levels, see Table 3.3.4α, and select appropriately from them. Table 3.3.4a
Test force
After the specified holding time, remove the test force and measure the length of the two diagonals of the indentation (see Figure 3.3.4). 2. The essence of the micro Vickers hardness test is a Vickers hardness test with a small test force (0.09807~1.961N). The test force is divided into five levels, see Table 3.3.4b.
The micro-Vickers hardness test is mainly used to determine the hardness of the microstructure and micro-segregation zone of metal materials. The test method is the same as that of this Article 1.
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