CN112975282B

CN112975282B - Method for determining notch machining position of Charpy impact test sample

Info

Publication number: CN112975282B
Application number: CN202110187657.3A
Authority: CN
Inventors: 万骏; 邓硕
Original assignee: Wuhu Shipyard Co Ltd
Current assignee: Wuhu Shipyard Co Ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2022-02-01
Anticipated expiration: 2041-02-09
Also published as: CN112975282A

Abstract

The invention provides a method for determining notch processing positions of Charpy impact test samples, which is applied to the technical field of dynamic mechanical property test methods, wherein when the sections of the Charpy impact test samples are single-side welded or double-side welded with cut sections similar to the single-side welded, three straight lines of a1, b1 and c1 are parallel to each other, a1 is positioned between b1 and c1, and a1, b1 and c1 and a fusion line divide welding seams and parent metal parts of the Charpy impact test samples into 4 parts: the area of a base material I area 101 is A1, the area of a base material II area 102 is B1, the area of a weld I area 103 is C1, the area of a weld II area 104 is D1, a1 moves between B1 and C1, the numerical values of A1/B1 and C1/D1 are also changed along with the movement of a1, and the position of a1 is the position of a charpy impact specimen notch central line when A1/B1 is C1/D1.

Description

Method for determining notch machining position of Charpy impact test sample

Technical Field

The invention belongs to the technical field of dynamic mechanical property test methods, and particularly relates to a method for determining a notch processing position of a Charpy impact test sample.

Background

The Charpy impact test is a dynamic mechanical property test method which utilizes the energy conservation principle to break a Charpy impact test sample with a specific shape and size processed and manufactured according to relevant standards under the action of impact load so as to measure the impact absorption energy of the Charpy impact test sample in the fracture process. The charpy impact test has become a traditional mechanical property test for measuring the toughness of metal materials which is most widely applied due to the characteristics of simple and convenient sample processing, short test time and sensitivity of test data to material tissue structure, metallurgical defects and the like, is also one of important means for evaluating the toughness of metal materials under impact load, and is more an important test method for testing the toughness of materials in the welding process approval test in engineering. The factors influencing the Charpy impact test result of the metal material are many, and the main factors include the processing and manufacturing of the material and the sample, the measurement instrument and equipment, the operation of personnel and the like. The machining position of the notch of the sample has the largest influence on the test result, and if the machining position of the notch is inaccurate, the test result cannot accurately reflect the actual toughness level of the test material.

For the welding of metal materials, a welding seam is the weakest link of the whole steel, and the steel is easy to break and fail from the position of the welding seam. The weld seam is the juncture where the weld metal and the metal material substrate are combined, and is also the place where the weld seam is most prone to failure. Therefore, the impact absorption energy at the weld line is important for the trial evaluation of the safety performance at the weld joint. At present, standards for Charpy impact test methods and sample processing formed at home and abroad include GB/T229-2007 standards for Charpy pendulum impact test methods for metal materials, GB/T2650-2008 standards for welded joint impact test methods, ISO148-2006 standards for Charpy pendulum impact tests for metal materials, ISO9016-2012 standards for weld destructive tests for metal materials, namely impact tests and the like. Although charpy impact specimen notch processing positions of the weld line and the heat affected zone are specified in these standards, the charpy impact specimen notch processing position at the weld line is not specifically described. The welding line of the metal material welding line has the characteristics of irregular shape, very narrow shape and the like, so that the Charpy impact energy at the welding line is difficult to obtain, and the method for determining the processing position of the Charpy impact specimen notch at the welding line cannot meet the actual requirement in the existing various standards.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the method for determining the notch processing position of the Charpy impact test sample is simple in step, can effectively solve the problem that the existing welding process recognizes the notch processing position of the Charpy impact test sample of the material at the welding line in the Charpy impact test, ensures that the Charpy impact test is reliably carried out, and is accurate and reliable in test result.

To solve the technical problems, the invention adopts the technical scheme that:

the invention relates to a method for determining a notch processing position of a Charpy impact test sample, which comprises the following processing steps: 1) firstly, taking down a Charpy impact test sample blank from a test board approved by a welding process; 2) grinding and polishing one side surface of a welding line of the Charpy impact test sample blank, and then selecting a corrosive liquid to corrode according to the material quality of the Charpy impact test sample blank to form a corrosion surface; 3) determining the position of a central line of a notch on the center of a welding line and a heat affected zone of the Charpy impact test sample blank respectively; 4) the Charpy impact test sample blank comprises three different conditions that the section is single-side welded or double-side welded with a cut section similar to the single-side welded, the section is double-side welded containing the root of a weld line fusion line, the distance between the root of the weld line fusion line and the upper surface and the lower surface of the Charpy impact test sample is close, the section is double-side welded containing the root of the weld line fusion line, the distance between the root of the weld line fusion line and the upper surface and the distance between the root of the Charpy impact test sample and the lower surface of the Charpy impact test sample are greatly different, and the position of a notch central line of the Charpy impact test sample is respectively determined for different conditions; 5) after the central line position of the Charpy impact sample notch is well positioned, cutting lines are respectively drawn towards the two sides of the central line, the Charpy impact sample blank is cut into a new sample blank along the cutting lines, the new sample blank is sent to a grinding machine to be processed into a Charpy impact sample with the surface meeting the roughness requirement of the Charpy impact sample, a V-shaped notch meeting the requirement of the Charpy impact sample is drawn out by an impact sample notch broaching machine, and then the Charpy impact test is carried out on the Charpy impact sample; when the section of the Charpy impact sample is single-side welded or double-side welded with a cut section similar to the single-side welded, b1 is a straight line passing through the intersection point of the fusion bonding line and the lower surface of the Charpy impact sample and perpendicular to the upper surface and the lower surface of the Charpy impact sample, and c1 is a straight line passing through the intersection point of the fusion bonding line and the upper surface of the Charpy impact sample and perpendicular to the upper surface and the lower surface of the Charpy impact sample. Three straight lines a1, b1 and c1 are parallel to each other, a1 is positioned between b1 and c1, and a1, b1 and c1 and a fusion line divide the Charpy impact sample weld seam and the parent metal part into 4 parts: a base material I area 101, a base material II area 102, a weld I area 103 and a weld II area 104 are set as A1, an area of the base material I area 101 is B1, an area of the weld I area 103 is C1, an area of the weld II area 104 is D1, a1 moves between B1 and C1, values of A1/B1 and C1/D1 are changed continuously along with movement of a1, and the position of a1 is the Charpy impact specimen notch center line position when A1/B1 is equal to C1/D1.

When the cross section of the Charpy impact specimen is double-sided welding containing the root of the welding line, and the distance between the root of the welding line and the upper surface and the lower surface of the Charpy impact specimen is larger, b2 is a straight line passing through the root of the welding line and perpendicular to the upper surface and the lower surface of the Charpy impact specimen, and c2 is a straight line passing through the intersection point of the welding line and the position, farthest from the center of the welding line, of the upper surface or the lower surface of the Charpy impact specimen and perpendicular to the upper surface and the lower surface of the Charpy impact specimen. Three straight lines of a2, b2 and c2 are parallel to each other, and a2 is positioned between b2 and c 2. a2, b2, c2 and the weld line divide the charpy impact specimen weld and parent material portion into 5 sections: the area of the base material I region 201 is A2, the area of the base material II region 202 is B2, the area of the weld I region 203 is C2, the area of the weld II region 204 is D2, the area of the weld III region 205 is E2, a2 moves between B2 and C2, the numerical values of A2/B2 and C2/(D2+ E2) are continuously changed along with the movement of a2, and the position of a2 when A2/B2 is equal to C2/(D2+ E2) is the Charpy impact specimen notch line position.

When the cross section of the Charpy impact specimen is double-sided welding containing the root of the welding line, and the distance between the root of the welding line and the upper surface and the lower surface of the Charpy impact specimen is close, b3 is a straight line passing through the root of the welding line and perpendicular to the upper surface and the lower surface of the Charpy impact specimen, and c3 is a straight line passing through the intersection point of the welding line and the position, farthest from the center of the welding line, of the upper surface or the lower surface of the Charpy impact specimen and perpendicular to the upper surface and the lower surface of the Charpy impact specimen. Three straight lines of a3, b3 and c3 are parallel to each other, and a3 is positioned between b3 and c 3. a3, b3, c3 and the weld line divide the charpy impact specimen weld and parent material portion into 6 sections: the area of the base material I area 301, the area of the base material II area 302, the area of the weld I area 303, the area of the weld II area 304, the area of the weld III area 305 and the weld IV area 306 are respectively A3, B3, C3, D3, E3, F3 and F3, the A3 moves between B3 and C3, the values of A3/B3 and (C3+ E3)/(D3+ F3) are also changed along with the movement of A3, and the position of A3 when A3/B3 is equal to (C3+ F3)/(D3+ E3) is the Charpy impact specimen notch center line position.

When the Charpy impact test sample blank is taken down from a test plate approved by a welding process, according to the standard requirements of the Material and welding Specifications, GB/T2650-2008 'welding joint impact test method', or ISO9016-2012 'metallic material welding destructive test-impact test', of China Classification, the Charpy impact test sample blank is taken down from the corresponding position of the test plate approved by the welding process, and the surface roughness of the Charpy impact test sample blank meets the standard requirements, so that the Charpy impact sample blank is drawn orderly, and a machining allowance is reserved for the size of the Charpy impact test sample processed.

When the positions of the central lines of the notches are determined on the weld centers and the heat affected zones of the Charpy impact test sample embryos respectively, the positions of the central lines of the notches of the Charpy impact test sample embryos are determined on the Charpy impact test sample embryos in the weld centers and the heat affected zones respectively according to the standard requirements of the Material and welding Specifications, GB/T2650-2008 'impact test method for welded joints or ISO 9016-2012' impact tests for metal material welding destructiveness.

After the position of the central line of the Charpy impact sample notch is well positioned, cutting lines are respectively drawn at the positions 27.5mm on the two sides of the central line, the Charpy impact sample blank is cut into new sample blanks with the size of 55 multiplied by 10.1 multiplied by 10.5mm along the cutting lines, the new sample blanks are sent to a grinding machine to be processed into Charpy impact samples meeting the requirements of the standards of China Classification's material and welding Specifications, GB/T2650-2008 ' weld joint impact test method ' and ISO9016-2012 ' metal material weld destructive test-impact test ', a V-shaped notch meeting the requirement of the Charpy impact samples is drawn by an impact sample notch broaching machine, and then the Charpy impact test is carried out.

By adopting the technical scheme of the invention, the following beneficial effects can be obtained:

the invention relates to a method for determining a processing position of a Charpy impact test sample notch, which aims to solve the problem that the existing welding process recognizes the positioning of the processing position of the Charpy impact test sample notch of a material at a weld line fusion line of a Charpy impact test. The blank that the test welding process can accept impact absorption energy at the weld line of the Charpy impact test is filled, and the toughness index of the weakest part of the weld is obtained. The method has important significance for engineering application such as welding material performance test, welding process acceptance test, failure analysis and the like. The method for determining the notch processing position of the Charpy impact test sample can effectively solve the problem of the notch processing position positioning of the Charpy impact test sample of the material at the weld joint line in the Charpy impact test approved by the existing welding process, ensure the reliable performance of the Charpy impact test and ensure the accurate and reliable test result.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIG. 1 is a schematic view of the centerline of a Charpy impact specimen notch;

FIG. 2 is a schematic view I of a Charpy impact test sample blank (the cross section is a single-side welding or a double-side welding with a cross section similar to the single-side welding after cutting);

FIG. 3 is a schematic view II of a Charpy impact test sample blank (the section is a double-sided weld including the root of a weld fusion line, and the distance between the root of the weld fusion line and the upper and lower surfaces of the Charpy impact test sample is close);

FIG. 4 is a schematic view of a Charpy impact test specimen blank (the cross section is a double-sided weld including a weld fusion line root, and the distance between the weld fusion line root and the upper surface and the lower surface of the Charpy impact test specimen is greatly different);

FIG. 5 is a schematic diagram showing a position sampling of a fusion line in a double-sided welding process in which a cross section is a single-sided welding or a cut cross section similar to the single-sided welding;

FIG. 6 is a schematic diagram of a weld line position sampling in a double-sided weld having a weld line root with a greater distance difference between the weld line root and the Charpy impact specimen upper and lower surfaces;

FIG. 7 is a schematic view of a weld line position sampling taken in a cross-section of a double-sided weld including a weld line root at a similar distance from the upper and lower surfaces of a Charpy impact specimen;

in the drawings, the reference numbers are respectively: 1. charpy impact test specimens; 2. a sample notch; 3. the center line of the notch.

Detailed Description

The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:

as shown in fig. 1 to 7, the present invention is a method for determining a notch machining position of a charpy impact test specimen, and the method for determining the notch machining position of the charpy impact test specimen includes the following machining steps: 1) firstly, taking down a Charpy impact test sample blank from a test board approved by a welding process; 2) grinding and polishing one side surface of a welding line of the Charpy impact test sample blank, and then selecting a corrosive liquid to corrode according to the material quality of the Charpy impact test sample blank to form a corrosion surface; 3) determining the position of a central line of a notch on the center of a welding line and a heat affected zone of the Charpy impact test sample blank respectively; 4) the Charpy impact test sample blank comprises three different conditions that the section is single-side welded or double-side welded with a cut section similar to the single-side welded, the section is double-side welded containing the root of a weld line fusion line, the distance between the root of the weld line fusion line and the upper surface and the lower surface of the Charpy impact test sample is close, the section is double-side welded containing the root of the weld line fusion line, the distance between the root of the weld line fusion line and the upper surface and the distance between the root of the Charpy impact test sample and the lower surface of the Charpy impact test sample are greatly different, and the position of a notch central line of the Charpy impact test sample is respectively determined for different conditions; 5) after the central line position of the Charpy impact sample notch is well positioned, cutting lines are respectively drawn towards the two sides of the central line, the Charpy impact sample blank is cut into a new sample blank along the cutting lines, the new sample blank is sent to a grinding machine to be processed into a Charpy impact sample with the surface meeting the roughness requirement of the Charpy impact sample, a V-shaped notch meeting the requirement of the Charpy impact sample is drawn out by an impact sample notch broaching machine, and then the Charpy impact test is carried out on the Charpy impact sample; as shown in fig. 5, when the cross section of the charpy impact specimen is single-side welded or double-side welded with a cut cross section similar to the single-side welded, b1 is a straight line passing through the intersection point of the weld line and the lower surface of the charpy impact specimen and perpendicular to the upper and lower surfaces of the charpy impact specimen, and c1 is a straight line passing through the intersection point of the weld line and the upper surface of the charpy impact specimen and perpendicular to the upper and lower surfaces of the charpy impact specimen. Three straight lines a1, b1 and c1 are parallel to each other, a1 is positioned between b1 and c1, and a1, b1 and c1 and a fusion line divide the Charpy impact sample weld seam and the parent metal part into 4 parts: a base material I area 101, a base material II area 102, a weld I area 103 and a weld II area 104 are set as A1, an area of the base material I area 101 is B1, an area of the weld I area 103 is C1, an area of the weld II area 104 is D1, a1 moves between B1 and C1, values of A1/B1 and C1/D1 are changed continuously along with movement of a1, and the position of a1 is the Charpy impact specimen notch center line position when A1/B1 is equal to C1/D1. In order to solve the problem that the traditional welding process recognizes the positioning of the notch processing position of the Charpy impact test sample of the material at the weld joint line in the Charpy impact test, the invention provides a method for determining the notch processing position of the Charpy impact test sample at the weld joint line by calculating the area ratio. The blank that the test welding process can accept impact absorption energy at the weld line of the Charpy impact test is filled, and the toughness index of the weakest part of the weld is obtained. The invention has important significance for engineering application such as welding material performance test, welding process acceptance test, failure analysis and the like. The method for determining the notch processing position of the Charpy impact test sample has simple steps, can effectively solve the problem that the existing welding process recognizes the notch processing position positioning of the Charpy impact test sample of the material at the weld line in the Charpy impact test, ensures that the Charpy impact test is reliably carried out, and has accurate and reliable test results.

As shown in fig. 7, when the cross section of the charpy impact specimen is double-sided welding including the root of the weld line, and the distance between the root of the weld line and the upper surface and the lower surface of the charpy impact specimen is greatly different, b2 is a straight line passing through the root of the weld line and perpendicular to the upper surface and the lower surface of the charpy impact specimen, and c2 is a straight line passing through the intersection point of the weld line and the position of the upper surface or the lower surface of the charpy impact specimen farthest from the center of the weld line and perpendicular to the upper surface and the lower surface of the charpy impact specimen. Three straight lines of a2, b2 and c2 are parallel to each other, and a2 is positioned between b2 and c 2. a2, b2, c2 and the weld line divide the charpy impact specimen weld and parent material portion into 5 sections: the area of the base material I region 201 is A2, the area of the base material II region 202 is B2, the area of the weld I region 203 is C2, the area of the weld II region 204 is D2, the area of the weld III region 205 is E2, a2 moves between B2 and C2, the numerical values of A2/B2 and C2/(D2+ E2) are continuously changed along with the movement of a2, and the position of a2 when A2/B2 is equal to C2/(D2+ E2) is the Charpy impact specimen notch line position.

As shown in fig. 6, when the cross section of the charpy impact specimen is double-sided welding including the root of the weld line, and the root of the weld line is close to the upper surface and the lower surface of the charpy impact specimen, b3 is a straight line passing through the root of the weld line and perpendicular to the upper surface and the lower surface of the charpy impact specimen, and c3 is a straight line passing through the intersection point of the weld line and the upper surface or the lower surface of the charpy impact specimen farthest from the center of the weld line and perpendicular to the upper surface and the lower surface of the charpy impact specimen. Three straight lines of a3, b3 and c3 are parallel to each other, and a3 is positioned between b3 and c 3. a3, b3, c3 and the weld line divide the charpy impact specimen weld and parent material portion into 6 sections: the area of the base material I area 301, the area of the base material II area 302, the area of the weld I area 303, the area of the weld II area 304, the area of the weld III area 305 and the weld IV area 306 are respectively A3, B3, C3, D3, E3, F3 and F3, the A3 moves between B3 and C3, the values of A3/B3 and (C3+ E3)/(D3+ F3) are also changed along with the movement of A3, and the position of A3 when A3/B3 is equal to (C3+ F3)/(D3+ E3) is the Charpy impact specimen notch center line position.

The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.

Claims

1. A method for determining a notch processing position of a Charpy impact test sample is characterized by comprising the following steps of: the method for determining the notch processing position of the Charpy impact test sample comprises the following processing steps: 1) firstly, taking down a Charpy impact test sample blank from a test board approved by a welding process; 2) grinding and polishing one side surface of a welding line of the Charpy impact test sample blank, and then selecting a corrosive liquid to corrode according to the material quality of the Charpy impact test sample blank to form a corrosion surface; 3) determining the position of a central line of a notch on the center of a welding line and a heat affected zone of the Charpy impact test sample blank respectively; 4) the Charpy impact test sample blank comprises three different conditions that the section is single-side welded or double-side welded with a cut section similar to the single-side welded, the section is double-side welded containing the root of a weld line fusion line, the distance between the root of the weld line fusion line and the upper surface and the lower surface of the Charpy impact test sample is close, the section is double-side welded containing the root of the weld line fusion line, the distance between the root of the weld line fusion line and the upper surface and the distance between the root of the Charpy impact test sample and the lower surface of the Charpy impact test sample are greatly different, and the position of a notch central line of the Charpy impact test sample is respectively determined for different conditions; 5) after the position of the central line of the Charpy impact sample notch is well positioned, cutting lines are respectively drawn at the two sides of the central line, the Charpy impact sample blank is cut into a new sample blank along the cutting lines, the new sample blank is sent to a grinding machine to be processed into a Charpy impact sample with a surface having roughness, a V-shaped notch is drawn out by using an impact sample notch broaching machine, and then a Charpy impact test is carried out on the Charpy impact sample; when the section of the Charpy impact specimen is single-side welding or double-side welding with the cut section similar to the single-side welding, b1 is a straight line which passes through the intersection point of a fusion line and the lower surface of the Charpy impact specimen and is vertical to the upper surface and the lower surface of the Charpy impact specimen, c1 is a straight line which passes through the intersection point of the fusion line and the upper surface of the Charpy impact specimen and is vertical to the upper surface and the lower surface of the Charpy impact specimen, three straight lines a1, b1 and c1 are parallel to each other, a1 is positioned between b1 and c1, and the welding lines a1, b1 and c1 divide the welding line and the parent metal part of the Charpy impact specimen into 4 parts: a base material I area 101, a base material II area 102, a weld I area 103 and a weld II area 104 are set as A1, an area of the base material I area 101 is B1, an area of the weld I area 103 is C1, an area of the weld II area 104 is D1, a1 moves between B1 and C1, values of A1/B1 and C1/D1 are changed continuously along with movement of a1, and the position of a1 is the Charpy impact specimen notch center line position when A1/B1 is equal to C1/D1.

2. The method for determining the charpy impact test specimen notch working position according to claim 1, characterized in that: when the cross section of the Charpy impact specimen is double-sided welding containing a weld line root, and the distance between the weld line root and the upper surface and the lower surface of the Charpy impact specimen is greatly different, b2 is a straight line passing through the weld line root and perpendicular to the upper surface and the lower surface of the Charpy impact specimen, c2 is a straight line passing through the intersection point of the weld line and the upper surface or the lower surface of the Charpy impact specimen farthest away from the center of the weld line and perpendicular to the upper surface and the lower surface of the Charpy impact specimen, three straight lines a2, b2 and c2 are parallel to each other, a2 is positioned between b2 and c2, and a2, b2 and c2 divide the weld line and the parent material part of the Charpy impact specimen into 5 parts by the weld lines: the area of the base material I region 201 is A2, the area of the base material II region 202 is B2, the area of the weld I region 203 is C2, the area of the weld II region 204 is D2, the area of the weld III region 205 is E2, a2 moves between B2 and C2, the numerical values of A2/B2 and C2/(D2+ E2) are continuously changed along with the movement of a2, and the position of a2 when A2/B2 is equal to C2/(D2+ E2) is the Charpy impact specimen notch line position.

3. The method for determining the charpy impact test specimen notch working position according to claim 1, characterized in that: when the cross section of the Charpy impact specimen is double-sided welding containing a weld line root, and the distance between the weld line root and the upper surface and the lower surface of the Charpy impact specimen is close, b3 is a straight line passing through the weld line root and perpendicular to the upper surface and the lower surface of the Charpy impact specimen, c3 is a straight line passing through the intersection point of the weld line and the upper surface or the lower surface of the Charpy impact specimen farthest away from the center of the weld line and perpendicular to the upper surface and the lower surface of the Charpy impact specimen, three straight lines a3, b3 and c3 are parallel to each other, a3 is positioned between b3 and c3, and a3, b3 and c3 and the weld line divide the weld line and the parent material part of the Charpy impact specimen into 6 parts: the area of the base material I area 301, the area of the base material II area 302, the area of the weld I area 303, the area of the weld II area 304, the area of the weld III area 305 and the weld IV area 306 are respectively A3, B3, C3, D3, E3, F3 and F3, the A3 moves between B3 and C3, the values of A3/B3 and (C3+ E3)/(D3+ F3) are also changed along with the movement of A3, and the position of A3 when A3/B3 is equal to (C3+ F3)/(D3+ E3) is the Charpy impact specimen notch center line position.

4. The method for determining the charpy impact test specimen notch working position according to claim 1, 2 or 3, characterized in that: when the Charpy impact test sample blank is taken down from a test plate approved by a welding process, according to the standard requirements of the Material and welding Specifications, GB/T2650-2008 'welding joint impact test method', or ISO9016-2012 'metallic material welding destructive test-impact test', of China Classification, the Charpy impact test sample blank is taken down from the corresponding position of the test plate approved by the welding process, and the surface roughness of the Charpy impact test sample blank meets the standard requirements, so that the Charpy impact sample blank is drawn orderly, and a machining allowance is reserved for the size of the Charpy impact test sample processed.

5. The method for determining the charpy impact test specimen notch working position according to claim 1, 2 or 3, characterized in that: when the positions of the central lines of the notches are determined on the weld centers and the heat affected zones of the Charpy impact test sample embryos respectively, the positions of the central lines of the notches of the Charpy impact test sample embryos are determined on the Charpy impact test sample embryos in the weld centers and the heat affected zones respectively according to the standard requirements of the Material and welding Specifications, GB/T2650-2008 'impact test method for welded joints or ISO 9016-2012' impact tests for metal material welding destructiveness.

6. The method for determining the charpy impact test specimen notch working position according to claim 1, 2 or 3, characterized in that: after the position of the central line of the Charpy impact sample notch is well positioned, cutting lines are respectively drawn at the positions 27.5mm on the two sides of the central line, the Charpy impact sample blank is cut into new sample blanks with the size of 55 multiplied by 10.1 multiplied by 10.5mm along the cutting lines, the new sample blanks are sent to a grinding machine to be processed into Charpy impact samples meeting the requirements of the standards of China Classification's material and welding Specifications, GB/T2650-2008 ' weld joint impact test method ' and ISO9016-2012 ' metal material weld destructive test-impact test ', a V-shaped notch meeting the requirement of the Charpy impact samples is drawn by an impact sample notch broaching machine, and then the Charpy impact test is carried out.