CN106513925B - method for screening reasonable welding process parameters based on impact toughness - Google Patents
method for screening reasonable welding process parameters based on impact toughness Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
A method for screening reasonable welding process parameters based on impact toughness belongs to the field of material mechanical property evaluation and characterization; the method comprises the following steps: 1) pretreating a steel plate; 2) performing single-pass welding on the steel plate to obtain a welded plate containing a complete welding heat affected zone; 3) intercepting an impact sample on a welding plate, and forming a V/U-shaped notch; 4) detecting the impact toughness of the impact test sample, obtaining the impact absorption work of the impact test sample, and determining the impact fracture behavior of a heat affected zone; 5) and (3) judging: when the requirement that the impact absorption power of the welding plate is more than or equal to that of 1/2 original steel plates and the impact fracture behavior of the heat affected zone is ductile fracture is met, the welding process parameters are reasonable, otherwise, the welding process parameters are unreasonable; according to the method, a welding heat affected zone is prepared by adopting single-pass flat plate welding; welding process parameters can be adjusted in a large range, the deterioration degree of impact toughness of a heat affected zone is evaluated according to different welding processes, and reasonable process parameters are screened out; the welding process is few, the simple operation, practices thrift the cost, and is efficient.
Description
Technical Field
The invention belongs to the field of mechanical property evaluation and characterization of materials, and particularly relates to a method for screening reasonable welding process parameters based on impact toughness.
background
Welding is an essential process in the construction of steel structure engineering. With the large-scale and high-parameter engineering structure and the deterioration of service environment, the demand of high-performance medium-thickness steel plates is increasing. In the process of engineering structure construction, the same high-strength steel plate inevitably undergoes welding processes with different parameters, so that the original microstructure and the performance of the steel plate are changed to different degrees. For example, in the construction of west-east gas pipeline engineering, high-strength pipeline steel generally needs to be subjected to a gas shielded backing welding process, an internal and external multi-wire submerged arc welding process and a field annular welding process. The different process parameters used in these welding processes result in welded joints having different microstructures and mechanical properties. When the welding process parameters are not properly selected, the welding joint has a local embrittlement phenomenon, and the safety service performance of the welding structural part is seriously damaged. Therefore, screening out reasonable process parameters aiming at different welding methods is an important precondition for ensuring the integrity of the welded joint structure.
The phenomenon of deterioration of impact toughness in the heat-affected zone has been a major problem in the field of weld metallurgy. According to the theoretical analysis of the weld metallurgy, the steel plate is locally acted by a high-temperature welding heat source, and the microstructure is obviously changed to reduce the impact toughness. The change of the microstructure is mainly reflected in the following two aspects: (1) the grain size is coarsened, the welding temperature is extremely high (even exceeds 1300 ℃) near a fusion zone, and the austenite grains grow abnormally; (2) the formation of hard and brittle phase change products is beneficial to carbon enrichment to form M-A components due to the uneven cooling speed of welding thermal cycle, and particularly, part of austenite generated by reverse phase change is immediately converted into coarse M-A components in an incomplete phase change region under the condition of rapid cooling. These two aspects are important factors that cause a decrease in impact toughness of the heat-affected zone. The reasonable welding process can be designed to furthest inhibit the adverse effects of the two factors on the impact toughness. In addition, for high-strength structural steel, the content of alloy elements is relatively high, and when the heat input is small, a heat affected zone is easy to form a high-brittleness martensite structure; when the heat input amount is too large, side plate bar ferrite or widmanstatten structures tend to appear, and both of these matrix structures adversely affect the impact toughness of the heat-affected zone.
In order to optimize the toughness of the heat affected zone, metallurgists have improved the toughness mainly by changing the chemical composition of the base metal, such as "steel excellent in toughness of the weld heat affected zone and its manufacturing method" (CN101153372A) which mainly uses REM oxide and CaO to improve the toughness, such as "high-strength steel plate for high heat input welding with welded joint having better impact toughness in the weld heat affected zone" (CN101918607A) which adds Ti/B element to form TiO and TiO- (Ti, B) N 7 MnS composite oxide to promote the formation of acicular ferrite to improve the toughness ", and such as" high-strength steel with high weld heat affected zone toughness and its manufacturing method "(CN 101165202A) which improves the toughness by controlling the formation of cementite (or M-a component) after welding with ultra-low carbon, and such as" an in-line process for improving impact toughness in the weld heat affected zone "(CN 102152012A) which improves the toughness by blowing high-pressure gas during welding, such patents use the welded joint to evaluate the heat affected zone in practice, and such as to improve the toughness of the weld heat affected zone, although there are not proposed significant weld heat affected zone improvement parameters.
The impact toughness of the weld heat affected zone of the steel plate is detected and evaluated by two methods: although the method is a direct and commonly adopted method for evaluating the toughness of a heat affected zone by adopting an actual welded joint, the pretreatment process is more complicated, and if a welded plate needs to be beveled, the two ends of the welded plate are respectively lapped to initiate an arc and extinguish the arc, the method is simple and convenient to operate. Due to more technological parameters, the method for detecting the toughness of the heat affected zone also needs to consume a large amount of raw materials, and has high labor intensity and poor economy. After the multi-pass welding process is adopted, the heat affected zone structure is complex due to the interaction of the inter-pass thermal cycle, the pertinence of toughness evaluation is not strong, the toughness value is relatively discrete due to the sampling position of the impact sample, and the effectiveness of screening reasonable welding process parameters according to experimental results is reduced. And the other method adopts a welding heat simulation method, which only simulates the sub-zone welding heat cycle characteristics, mainly analyzes the impact toughness change of a single sub-zone and does not embody the continuously changed microstructure characteristics of the heat-affected zone, so that the method cannot represent the evolution of the whole impact toughness of the heat-affected zone.
as described above, the same steel plate may be subjected to a welding process of various process parameters of different welding methods in one engineering project. Therefore, how to quickly and conveniently screen out a reasonable welding process is very necessary to ensure that the impact toughness of a welding heat affected zone is not deteriorated and improve the safety and reliability of an engineering structure. However, although the degree of impact toughness degradation in the heat affected zone is an important parameter that directly affects the integrity of the welded joint structure, there is no method for evaluating the weld process parameters that is fast, convenient, and screenable.
Disclosure of Invention
Aiming at the defects of the prior art, particularly the problems that when a steel plate needs to be welded by adopting different process parameters, unreasonable process parameters can obviously deteriorate the impact toughness of a welding heat affected zone and the like, the invention provides a method for rapidly screening reasonable welding process parameters based on the impact toughness; aims to provide a method for rapidly evaluating the impact toughness of a welding heat affected zone and screening out reasonable welding process parameters, which has simple process, low cost and convenient operation, solves the problems of single evaluation method, complex operation and the like of the impact toughness of the current welding heat affected zone,
The method for rapidly screening reasonable welding process parameters based on impact toughness is mainly used for rapidly evaluating the impact toughness of a heat affected zone of a high-strength medium-thickness steel plate for a welding (mainly fusion welding) structure, particularly evaluating the deterioration degree of the impact toughness of the welding heat affected zone under the condition of different heat input quantities, and screening out the reasonable process parameters capable of obtaining excellent welding heat affected zone toughness; the method specifically comprises the following steps:
Step 1, steel plate pretreatment:
pretreating the steel plate, and removing iron scales and oil stains on the surface to smooth the surface of the steel plate;
Step 2, single-pass welding:
Performing single-pass welding on the steel plate to obtain a welded plate comprising a complete welding heat affected zone, wherein the process parameters of the single-pass welding are as follows: welding current, welding voltage and welding speed;
step 3, preparing an impact sample:
defining a point farthest away from the welding surface of the original steel plate in a heat affected zone on the welding plate, wherein the point is the central point of the heat affected zone, and a straight line which is perpendicular to the welding plane of the original steel plate and passes through the central point is a central line; the impact sample is a cuboid, and the longest side of the impact sample is defined as the length of the impact sample;
intercepting an impact sample on a welding plate, enabling the length of the impact sample to be perpendicular to the direction of a weld bead, enabling the length of the impact sample to be parallel to the original steel plate welding plane and taking a central line as a long symmetrical line, enabling a welding heat affected zone on the central line to be located in the middle of the thickness direction of the impact sample, if the welding plate does not meet the size of the impact sample, increasing the thickness or the length of the steel plate, and restarting the step 1;
Opening a V-shaped or U-shaped notch on the impact sample, and enabling the V-shaped or U-shaped notch to penetrate through a heat affected zone of the impact sample;
Step 4, impact test:
Detecting the impact toughness of an impact sample by adopting a pendulum bob type or drop hammer type impact testing machine to obtain the impact absorption work of the impact sample, observing the fracture surface morphology characteristics of the impact sample, and determining the impact fracture behavior of a heat affected zone;
step 5, judging whether the welding process parameters are reasonable:
If the following conditions (a) and (b) are met simultaneously, judging that the welding process parameters, namely the welding current, the welding voltage and the welding speed are reasonable; otherwise, it is not reasonable;
(a) impact absorption work of impact specimen: the impact absorption work of the welding plate is more than or equal to that of 1/2 original steel plates;
(b) the impact fracture behavior of the heat affected zone is ductile fracture.
in the method for rapidly screening reasonable welding process parameters based on impact toughness, the method comprises the following steps:
defining that the section vertical to the original steel plate welding plane in the welding heat affected zone is the cross section of the welding heat affected zone;
the definition, welding heat affected zone, refers to the zone where the base material around the weld seam undergoes solid phase change behavior and mechanical property change under the action of the welding heat source, and can be generally subdivided into a coarse crystal zone, a fine crystal zone, an incomplete phase change zone, and a tempering zone. The complete welding heat affected zone is a heat affected zone of four complete sub-zones including a coarse crystal zone, a fine crystal zone, an incomplete phase change zone and a tempering zone on the cross section of the steel plate.
In the step 1, the steel plate is one of low-carbon steel, medium-carbon steel, low-alloy or medium-alloy high-strength steel plates.
in the step 1, the thickness of the steel plate is more than or equal to 5mm, and the width or length of the steel plate is more than or equal to 55 mm.
in the step 1, the surface of the steel plate is polished by a grinding wheel, and iron scale and oil stains on the surface are removed.
In the step 2, the first position of the single-pass welding on the steel plate is the middle part of the steel plate.
In the step 2, the welding mode adopts fusion welding, namely the welding joint is prepared by one method of manual electric arc welding, gas shielded welding, submerged arc welding or argon arc welding.
in said step 2, a welded plate is obtained which comprises a complete welding heat affected zone, also meaning that the complete welding heat affected zone is comprised in the cross section of the steel plate.
In the step 3, the size of the impact sample is selected to meet the national standard GB/T229.
in the step 3, the distance between the central point and the welding plane of the steel plate minus the depth of the weld pool is defined as the width of the heat affected zone, and the size of the impact sample is determined according to the width of the heat affected zone: when the width of the heat affected zone is less than or equal to 1mm (the width is narrower), the size of the impact test sample is selected to be 5mm multiplied by 10mm multiplied by 55 mm; when the width of the heat affected zone is > 1mm (the width is wide), the standard size of the impact specimen is selected to be 7.5mm × 10mm × 55mm or 10mm × 10mm × 55 mm.
in the step 3, the heat affected zone is located at the middle position of the impact specimen along the thickness direction of the original steel plate.
in the step 4, the impact absorption energy is the impact toughness.
And 4, judging whether the impact fracture behavior is brittle fracture, ductile fracture or the brittle fracture-ductile fracture simultaneously according to the appearance characteristics of the fracture of the impact sample.
and in the step 5, whether the welding process parameters are reasonable is further judged by evaluating the impact toughness of the heat affected zone of the impact test sample.
In the step 5, if the heat affected zone forms the morphology characteristic of the ductile fracture, the welding condition is shown to obtain the heat affected zone with better impact toughness, and the adopted welding process is more reasonable; if the impact absorption work of the sample is obviously reduced compared with that of the base material and the heat affected zone of the sample has a brittle fracture form, the impact toughness of the heat affected zone is deteriorated under the welding condition, and the adopted welding process parameters are unreasonable.
the method for rapidly screening reasonable welding process parameters based on impact toughness can be used for single-pass welding or multi-pass welding of the steel plate if the welding process parameters are judged to be reasonable finally.
compared with the prior art, the method for rapidly screening reasonable welding process parameters based on impact toughness has the beneficial effects that:
(1) The welding heat affected zone is prepared by adopting single-pass flat plate welding, the microstructure change of the heat affected zone under different welding process parameters can be completely presented, the structure of the heat affected zone is simpler, the position of the fracture surface of an impact sample is clear, and the change of the impact toughness of the heat affected zone under the adopted welding process can be evaluated with high pertinence.
(2) According to the thickness of the steel plate, welding process parameters can be adjusted in a large range, and the deterioration degree of the impact toughness of the welding heat affected zone under different processes can be conveniently detected.
(3) The steel plate is simple in pretreatment, few in welding procedures, convenient to operate, cost-saving, high in efficiency and free of limitation of sites and environments in the welding process.
Drawings
FIG. 1 is a schematic cross-sectional view of a weld plate and an impact pattern sampling location thereof according to an embodiment of the present invention;
FIG. 2 is a graph of load versus time for different welding processes for an impact specimen in an embodiment of the invention;
FIG. 3 is a scanning electron microscope picture of the macroscopic morphology of the fracture of the impact specimen in different welding processes in the embodiment of the invention; wherein, the white arrow points to the position of the fusion line, (a) corresponds to the welding process 1, (b) corresponds to the welding process 2, and (c) corresponds to the welding process 3.
detailed description of the preferred embodiment
Examples
a method for rapidly screening reasonable welding process parameters based on impact toughness specifically comprises the following steps:
step 1, pretreating a Q690MPa high-strength steel plate:
respectively preparing 3Q 690MPa high-strength steel plates with the size of 20mm multiplied by 400mm multiplied by 100mm, respectively preprocessing the Q690MPa high-strength steel plates, polishing one surface of each steel plate by adopting a grinding wheel, and removing surface iron oxide scales and oil stains to enable the surface of each steel plate to be flat;
step 2, single-pass welding:
respectively carrying out single-pass welding on the middle positions of Q690MPa high-strength steel plates by adopting submerged arc welding to obtain a welding plate comprising a complete welding heat affected zone, wherein the process parameters of 3 groups of single-pass welding are as follows: welding current, welding voltage and welding speed, wherein the heat input quantity is welding voltage multiplied by welding current/welding speed, and specific parameters are shown in table 1;
TABLE 1 Process parameters for single pass flat welding
step 3, preparing an impact sample:
Defining a point farthest away from the welding surface of the original steel plate in a heat affected zone on the welding plate, wherein the point is the central point of the heat affected zone, and a straight line which is perpendicular to the welding plane of the original steel plate and passes through the central point is a central line; the impact sample is a cuboid, and the longest side of the impact sample is defined as the length of the impact sample;
respectively intercepting impact samples meeting the national standard GB/T229 on a welding plate, wherein the sectional schematic diagram and the sampling positions of the impact samples are shown in figure 1, the size of the impact samples is 10mm multiplied by 55mm, the length of the impact samples is perpendicular to the welding bead direction, the length of the impact samples is parallel to the original Q690MPa high-strength steel plate welding plane and takes a central line as a long symmetrical line, a welding heat affected zone on the central line is positioned in the middle of the thickness direction of the impact samples, and the heat affected zone is positioned in the middle of the impact samples along the thickness direction of the original steel plate; opening a V-shaped or U-shaped notch on the impact sample, and enabling the V-shaped or U-shaped notch to penetrate through a heat affected zone of the impact sample;
In the embodiment, the width of the heat affected zone is 0.8-2.0 mm and is smaller than the thickness of the impact sample, and the sampling position of the impact sample should ensure that the heat affected zone is in the middle of the Charpy V-shaped notch as far as possible (the size and the position of the heat affected zone can be clearly observed by simply and coarsely grinding the impact sample blank and adopting 4% nitric acid alcohol for corrosion);
in order to detect the discreteness of the impact toughness result, five impact samples are prepared on each welding plate, so that 15 samples are prepared corresponding to 3 sets of process parameters of single-pass welding;
Step 4, impact test:
The impact toughness of the impact sample is detected by adopting a drop hammer type impact tester, a load oscilloscope is equipped to record a load-time curve in the impact process, as shown in figure 2, the impact absorption power of the impact sample is obtained, the fracture surface morphology characteristics of the impact sample are observed, and the impact fracture behavior of a heat affected zone is determined;
Step 5, judging whether the welding process parameters are reasonable:
(a) impact absorption work of impact specimen:
Table 2 shows the impact toughness value of the impact specimen, and the impact absorption power of the Q690MPa high-strength steel plate is 196J; therefore, the impact absorption power of the welding plates corresponding to the welding processes 1-3 is more than half of that of the Q690MPa high-strength steel plate;
TABLE 2 impact toughness results for all samples
(b) judging the impact fracture behavior of the heat affected zone according to the macroscopic morphology of the fracture, as shown in fig. 3, it can be seen that fig. 3(a) corresponding to the welding process 1 shows that brittle fracture and ductile fracture occur simultaneously, brittle fracture occurs in the tempered zone, fig. 3(b) corresponding to the welding process 2 shows that ductile fracture occurs simultaneously, fig. 3(c) corresponding to the welding process 3 shows that brittle fracture and ductile fracture occur simultaneously, but brittle fracture is mainly the brittle fracture, and brittle fracture occurs in the coarse grain zone and the fine grain zone;
Therefore, the welding process 2 can be judged to simultaneously meet the following conditions (a) and (b), and the welding process parameters, namely the welding current, the welding voltage and the welding speed are judged to be reasonable, while the welding process 1 and the welding process 3 are not reasonable.
The process of screening for reasonable welding process parameters is described and further demonstrated below with reference to the tables and figures:
as is clear from FIG. 2 and Table 2 by comparing the values of the impact toughness of the base material, when the heat input amount is 1.38kJ/mm, the impact toughness similar to that of the base material can be obtained, and the impact toughness of the welded joint is reduced to a different degree in both of the other two sets of welding process parameters. Furthermore, it can be found that the dispersion of the impact toughness values of the welded joint obtained by the present invention is very small. Therefore, when the heat input quantity of welding process parameters is about 1.38kJ/mm after comparison, the welding heat influence of the test steel has higher impact toughness; the fracture morphology characteristics were observed by scanning electron microscopy, as shown in fig. 3, giving the macroscopic morphology of the fracture under three different welding processes. It can be found that when the heat input of the welding process is 2.05kJ/mm, the heat affected zone has obvious cleavage fracture area, namely brittle fracture morphology characteristics; when the heat input of the welding process is 0.92kJ/mm, although no brittle fracture appearance characteristic appears in a heat affected zone close to a fusion line, an obvious cleavage fracture appearance appears in a tempering zone; and when the heat input is 1.38kJ/mm, the whole fracture has the appearance characteristic of a ductile fracture, and the process parameters verify that the welding heat affected zone has better impact toughness.
To further verify the effectiveness of the present invention, actual welded joints were prepared using an actual multipass submerged arc welding process, using the welding process parameters shown in Table 1, with the interpass temperature controlled at 120-150 ℃, and the impact toughness of the heat affected zone of the actual welded joints was examined, and it was found that when the heat input was around 1.38kJ/mm, the impact toughness obtained was better, with an average value of 127J, while when the heat input of the welding process was 2.05kJ/mm or higher, the impact toughness decreased significantly (when the heat input was 2.05kJ/mm, the average value was 43J; when the heat input was 4.5kJ/mm, the average impact toughness of the heat affected was only 27J). Therefore, the effectiveness of the method for screening welding process parameters is verified, and the impact toughness of welding heat influence is further ensured.
Claims (5)
1. a method for screening reasonable welding process parameters based on impact toughness is characterized by comprising the following steps:
step 1, steel plate pretreatment:
pretreating the steel plate, and removing iron scales and oil stains on the surface to smooth the surface of the steel plate; wherein the thickness of the steel plate is more than or equal to 5mm, and the width or length is more than or equal to 55 mm; wherein, the steel plate is one of low-carbon steel, medium-carbon steel, low alloy or medium alloy high-strength steel plate;
Step 2, single-pass welding:
Performing single-pass welding on the steel plate to obtain a welded plate comprising a complete welding heat affected zone, wherein the process parameters of the single-pass welding are as follows: welding current, welding voltage and welding speed;
Step 3, preparing an impact sample:
defining a point farthest away from the welding surface of the original steel plate in a heat affected zone on the welding plate, wherein the point is the central point of the heat affected zone, and a straight line which is perpendicular to the welding plane of the original steel plate and passes through the central point is a central line; the impact sample is a cuboid, and the longest side of the impact sample is defined as the length of the impact sample;
intercepting an impact sample on a welding plate, enabling the length of the impact sample to be perpendicular to the direction of a weld bead, enabling the length of the impact sample to be parallel to the original steel plate welding plane and taking a central line as a long symmetrical line, enabling a welding heat affected zone on the central line to be located in the middle of the thickness direction of the impact sample, if the welding plate does not meet the size of the impact sample, increasing the thickness or the length of the steel plate, and restarting the step 1;
Opening a V-shaped or U-shaped notch on the impact sample, and enabling the V-shaped or U-shaped notch to penetrate through a heat affected zone of the impact sample;
when the width of a heat affected zone is less than or equal to 1mm, selecting the size of an impact sample to be 5mm multiplied by 10mm multiplied by 55 mm; when the width of the heat affected zone is more than 1mm, the size of the impact test sample is selected from the standard size of 7.5mm multiplied by 10mm multiplied by 55mm or 10mm multiplied by 55 mm;
The heat affected zone is positioned in the middle of the impact sample along the thickness direction of the original steel plate;
step 4, impact test:
Detecting the impact toughness of an impact sample by adopting a pendulum bob type or drop hammer type impact testing machine to obtain the impact absorption work of the impact sample, observing the surface morphology characteristics of a fracture of the impact sample, judging the brittle fracture, the ductile fracture or the simultaneous occurrence of the brittle fracture and the ductile fracture of the impact fracture behavior according to the morphology characteristics of the fracture of the impact sample, and determining the impact fracture behavior of a heat affected zone;
step 5, judging whether the welding process parameters are reasonable:
If the following conditions (a) and (b) are met simultaneously, judging that the welding process parameters, namely the welding current, the welding voltage and the welding speed are reasonable; otherwise, it is not reasonable;
(a) Impact absorption work of impact specimen: the impact absorption work of the welding plate is more than or equal to that of 1/2 original steel plates;
(b) the impact fracture behavior of the heat affected zone is ductile fracture.
2. the method for screening reasonable welding process parameters based on impact toughness of claim 1, wherein in the step 1, the surface of the steel plate is ground by a grinding wheel to remove surface iron oxide scales and oil stains.
3. The method for screening reasonable welding process parameters based on impact toughness of claim 1, wherein in the step 2, the first position for performing single-pass welding on the steel plate is the middle part of the steel plate.
4. The method for screening reasonable welding process parameters based on impact toughness according to claim 1, wherein in the step 2, the welding mode adopts fusion welding, namely, the welding joint is prepared by one method of manual arc welding, gas shielded welding, submerged arc welding or argon arc welding.
5. The method for screening reasonable welding process parameters based on impact toughness according to claim 1, wherein in the step 3, the selection of the size of the impact specimen meets the national standard GB/T229.
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| CN111521495B (en) * | 2020-04-30 | 2022-10-25 | 江苏师范大学 | Method for optimizing toughness of welding coarse crystal region of dual-phase high-strength steel |
| CN112985939A (en) * | 2021-02-09 | 2021-06-18 | 芜湖造船厂有限公司 | Charpy impact sample processing method for Charpy impact test |
| CN112985940A (en) * | 2021-02-09 | 2021-06-18 | 芜湖造船厂有限公司 | Method for processing Charpy impact test sample approved by welding process |
| CN113607568A (en) * | 2021-07-08 | 2021-11-05 | 中国建材检验认证集团股份有限公司 | Method and device for testing fracture toughness of ceramic substrate |
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| CN114029593A (en) * | 2021-11-02 | 2022-02-11 | 山东钢铁集团日照有限公司 | Weldability test method for evaluating toughness of welding heat affected zone of medium plate |
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