CN108982276B - Dynamic stress testing method and device in metal welding process - Google Patents
Dynamic stress testing method and device in metal welding process Download PDFInfo
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- CN108982276B CN108982276B CN201811116923.8A CN201811116923A CN108982276B CN 108982276 B CN108982276 B CN 108982276B CN 201811116923 A CN201811116923 A CN 201811116923A CN 108982276 B CN108982276 B CN 108982276B
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
Abstract
The invention discloses a method and a device for testing dynamic stress in a metal welding process. Wherein the method comprises the following steps: respectively carrying out welding heat simulation experiments on metal sections with preset thickness at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal sections with the preset thickness, respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to the heat cycle characteristic parameters, and if the actually measured heating speed and the generated bending deformation of the metal samples with the preset sizes meet set conditions, determining the metal samples with the preset sizes as standard samples; and respectively carrying out welding thermal simulation experiments on the standard samples with different maximum heating temperatures to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the respective corresponding maximum heating temperatures. The device is used for executing the method. The method and the device for testing the dynamic stress in the metal welding process improve the reliability of stress detection of the metal sample.
Description
Technical Field
The invention relates to the technical field of mechanical manufacturing, in particular to a method and a device for testing dynamic stress in a metal welding process.
Background
The thermal simulation testing machine can accurately simulate the thermal processing process of materials such as welding, heat treatment and the like.
At present, most of researches aim at the morphology and the mechanical property of tissues after thermal cycling. For example, a method for detecting stress in a high-temperature alloy post-welding heat treatment process simulates a welding process of a high-temperature alloy sample on a Gleelbe-3500 thermal simulation testing machine; adding a load which is uniformly loaded along the axial direction in the process of temperature reduction to obtain a heat affected zone which is equivalent to the residual stress and is subjected to welding thermal impact, and after welding simulation is completed, simulating the post-welding heat treatment process, so that the real-time change of the stress in the heat treatment process can be directly observed and recorded. In the welding and heat treatment processes, if the sample is bent and deformed, the reliability of the test result is affected.
Therefore, how to provide a method for detecting the stress of the sample during the welding process to improve the reliability of the stress detection of the sample is an important issue to be solved in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a device for testing dynamic stress in a metal welding process.
On one hand, the invention provides a dynamic stress testing method in a metal welding process, which comprises the following steps:
respectively carrying out welding heat simulation experiments on metal profiles with preset thicknesses at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal profiles with the preset thicknesses at the different maximum heating temperatures;
respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, and if the fact that the actually measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included in the thermal cycle characteristic parameters and the generated bending deformation is in a preset range is judged and obtained, the metal samples with the preset sizes are corresponding standard samples with the maximum heating temperatures; the thickness of the metal sample with the preset size is the preset thickness;
and respectively carrying out welding thermal simulation experiments on the different standard samples with the highest heating temperature to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the highest heating temperatures corresponding to the standard samples.
In another aspect, the present invention provides a dynamic stress testing apparatus for a metal welding process, including:
the device comprises an obtaining unit, a calculating unit and a processing unit, wherein the obtaining unit is used for respectively carrying out welding heat simulation experiments on the metal section with the preset thickness at different highest heating temperatures to obtain heat cycle characteristic parameters of the metal section with the preset thickness at different highest heating temperatures;
the judgment unit is used for respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, and if the fact that the actually-measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included by the thermal cycle characteristic parameters and the generated bending deformation is within a preset range is judged and obtained, the metal samples with the preset sizes are corresponding standard samples with the maximum heating temperatures; the thickness of the metal sample with the preset size is the preset thickness;
and the test unit is used for respectively carrying out welding thermal simulation experiments on the different standard samples with the highest heating temperature to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the respectively corresponding highest heating temperature.
In yet another aspect, the present invention provides an electronic device comprising: a processor, a memory, and a communication bus, wherein:
the processor and the memory are communicated with each other through the communication bus;
the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the dynamic stress testing method of the metal welding process provided by the embodiments.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium storing computer instructions that cause the computer to perform the metal welding process dynamic stress testing method provided in the embodiments above.
The invention provides a method and a device for testing dynamic stress of a metal welding process, which can respectively carry out welding heat simulation experiments on metal sections with preset thickness at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal sections with the preset thickness at different maximum heating temperatures, respectively carry out the welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to the respective heat cycle characteristic parameters at different maximum heating temperatures, obtain standard samples with the maximum heating temperatures after judging that the actual heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included by the heat cycle characteristic parameters and the generated bending deformation is within the preset range, respectively carry out the welding heat simulation experiments on the standard samples with different maximum heating temperatures to obtain the dynamic stress test results of the standard samples in the welding process at the corresponding maximum heating temperatures, the reliability of stress detection of the metal sample is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a dynamic stress testing method in a metal welding process according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a thermal cycling curve according to an embodiment of the present invention;
FIGS. 3 a-3 f are stress versus temperature curves of a standard sample at different maximum heating temperatures according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a standard sample according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a dynamic stress testing apparatus for a metal welding process according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a dynamic stress testing apparatus for a metal welding process according to another embodiment of the present invention;
fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a dynamic stress testing method in a metal welding process according to an embodiment of the present invention, and as shown in fig. 1, the dynamic stress testing method in the metal welding process provided by the present invention includes:
s101, respectively carrying out welding heat simulation experiments on metal profiles with preset thicknesses at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal profiles with the preset thicknesses at the different maximum heating temperatures;
specifically, a Gleelbe-3500 thermal simulation testing machine is used for performing welding thermal simulation experiments on metal profiles with preset thicknesses at different maximum heating temperatures, so that thermal cycle curves of the metal profiles at each maximum heating temperature can be obtained. And obtaining the characteristic parameters of the thermal cycle corresponding to each thermal cycle according to the thermal cycle curve at the highest heating temperature. Wherein the maximum heating temperature may be 400 ℃, 450 ℃, 470 ℃, 490 ℃, 510 ℃ and 550 ℃; the preset thickness is selected according to actual needs, and the embodiment of the invention is not limited; the maximum heating temperature is a heating peak temperature at which the sample is heated in the welding thermal simulation experiment.
For example, fig. 2 is a schematic diagram of a thermal cycle curve, and as shown in fig. 2, a heating process of the thermal cycle curve may be divided into two sections, and linear fitting may be performed respectively to obtain a heating speed corresponding to each section. The characteristic parameter of the thermal cycle comprises the highest temperature T of the first stagemax1The first stage heating speed vh1First stage heating time th1The second stage maximum temperature Tmax2And the second stage high-temperature heating rate vh2And the second stage high temperature heating time th2And a cooling mode, wherein th1＝Tmax1/vh1，th2＝(Tmax2-Tmax1)/vh2. Table 1 shows the A6N01 aluminum alloy thickness of 4mm at different maximum heating temperaturesCharacteristic parameters of the welding thermal cycle.
TABLE 1 welding thermal cycle characterization parameters for A6N01 aluminum alloy
S102, respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, wherein if the fact that the actually measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included in the thermal cycle characteristic parameters and the generated bending deformation is within a preset range is judged, the metal samples with the preset sizes are corresponding standard samples with the maximum heating temperatures; the thickness of the metal sample with the preset size is the preset thickness;
specifically, after different thermal cycle characteristic parameters at the highest heating temperatures are obtained, a Gleelbe-3500 thermal simulation testing machine and a welding thermal simulation experiment program compiled according to the thermal cycle characteristic parameters at the highest heating temperatures are used for respectively carrying out welding thermal simulation experiments on a plurality of groups of metal samples with preset sizes by adopting a displacement control method at each highest heating temperature, so that the actually measured heating speed and the bending deformation of each metal sample at each highest heating temperature can be obtained. And comparing the actually measured heating speed of a certain metal sample at the highest heating temperature with the given heating speed included in the thermal cycle characteristic parameters at the highest heating temperature, wherein if the actually measured heating speed is consistent with the given acceleration, namely the actually measured heating speed is equal to the given acceleration or the actually measured heating speed is in the set range of the given acceleration, and the bending deformation of the certain metal sample is in the preset range, the metal sample is the standard sample at the highest heating temperature. The thickness of the standard sample with the preset size is the preset thickness; the preset range is set according to actual experience, and the embodiment of the invention is not limited; the setting range of the given acceleration is set according to practical experience, and the embodiment of the invention is not limited. It will be appreciated that the metal coupon is derived from the metal profile.
For example, the plurality of sets of metal test pieces with preset sizes are two sets of aluminum alloy test pieces with different sizes, each set comprises 5 aluminum alloy test pieces, and the first set comprises: thickness t of aluminum alloy sampleaIs 4mm and has a parallel length LcIs 50mm, and the widths b of the parallel length portions are 6mm, 8mm, 10mm, 12mm and 15mm, respectively; second group: thickness t of aluminum alloy samplea4mm, a parallel length part width b of 10mm, and a parallel length Lc30mm, 40mm, 50mm, 60mm and 70mm respectively. In order to prevent the metal sample from being displaced in the welding simulation process, a plate-shaped tensile sample with a round hole is selected, namely the round hole is machined at the clamping end of the aluminum alloy sample, and the diameter of the round hole can be 5mm so as to fix the metal sample; other dimensions of the aluminum alloy test sample are set according to practical experience, and the embodiment of the invention is not limited.
S103, performing welding thermal simulation experiments on the different standard samples with the highest heating temperature to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the highest heating temperatures corresponding to the standard samples.
Specifically, adopt Gleeble3500 thermal simulation testing machine to be different the standard sample of maximum heating temperature is corresponding the maximum heating temperature carries out the welding thermal simulation experiment respectively down, obtains each the standard sample is in corresponding temperature and the power data in the welding thermal simulation experiment process, according to power data and corresponding the size of standard sample can calculate and obtain the stress of standard sample, according to the temperature with the stress data can establish corresponding the standard sample the relation curve of temperature and stress obtains each promptly the standard sample is in each correspondence the dynamic stress test result of the welding thermal simulation experiment under the maximum heating temperature.
For example, a welding thermal simulation experiment of a standard sample corresponding to 550 ℃ is performed at 550 ℃ by using a Gleeble3500 thermal simulation testing machine, a thermocouple is spot-welded at the center position of the standard sample of 550 ℃, the standard sample of 550 ℃ is fixedly installed in an operation box of the thermal simulation testing machine by using a special fixture, so that the standard sample of 550 ℃ is ensured not to be displaced, the thermal simulation testing machine automatically records and stores data such as temperature, force and the like in the welding thermal simulation experiment process, stress data of the standard sample of 550 ℃ can be obtained by calculation according to the collected force data and the size of the standard sample of 550 ℃, and a relation curve of the stress and the temperature of the standard sample of 550 ℃ can be established according to the stress data and the temperature data.
Fig. 3a to 3f are stress-temperature curves of standard samples at different maximum heating temperatures according to an embodiment of the present invention, as shown in fig. 3a to 3f, the maximum heating temperatures are 400 ℃, 450 ℃, 470 ℃, 490 ℃, 510 ℃ and 550 ℃, and the welding thermal simulation experiment is performed 5 times for the aluminum alloy standard sample at the maximum heating temperature at each maximum heating temperature. FIG. 3a is a relation curve of stress and temperature obtained by 5 times of welding simulation experiments on a 400 ℃ aluminum alloy standard sample at the maximum heating temperature of 400 ℃; FIG. 3b is a graph showing the relationship between stress and temperature obtained by performing 5 welding simulation experiments on a 450 ℃ aluminum alloy standard sample at the maximum heating temperature of 450 ℃; FIG. 3c is a stress-temperature relationship curve obtained by performing 5 welding simulation experiments on a 470 ℃ aluminum alloy standard sample at the maximum heating temperature of 470 ℃; FIG. 3d is a stress-temperature relationship curve obtained by performing 5 welding simulation experiments on 490 ℃ aluminum alloy standard samples at the maximum heating temperature of 490 ℃; FIG. 3e is a stress-temperature relationship curve obtained by performing 5 welding simulation experiments on a 510 ℃ aluminum alloy standard sample at the maximum heating temperature of 510 ℃; fig. 3f is a stress-temperature relationship curve obtained by performing 5 times of welding simulation experiments on a 550 ℃ aluminum alloy standard sample at the maximum heating temperature of 550 ℃. As can be seen from fig. 3a to 3f, in the heating stage, the compression stress is generated due to the expansion of the standard sample, and the compression stress is increased linearly with the increase of the temperature, but reaches the maximum value after reaching a certain temperature, which is the yield temperature of the material. After the temperature exceeds the yield temperature, the compressive stress gradually decreases as the temperature continues to increase. When the temperature reaches the maximum heating temperature, the stress is displayed as the compressive stress being smaller. In the cooling phase, tensile stress is generated due to the shrinkage of the specimen, and gradually increases as the temperature decreases. The dynamic stress testing method for the metal welding process can intuitively and accurately test the change condition of the stress in the welding process.
The invention provides a method for testing dynamic stress of metal welding process, which can respectively carry out welding heat simulation experiments on metal sections with preset thickness at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal sections with the preset thickness at different maximum heating temperatures, respectively carry out the welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to the respective heat cycle characteristic parameters at different maximum heating temperatures, obtain standard samples with the maximum heating temperatures after judging that the actually measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included by the heat cycle characteristic parameters and the generated bending deformation is within the preset range, respectively carry out the welding heat simulation experiments on the standard samples with different maximum heating temperatures to obtain the dynamic stress test results of the standard samples in the welding process at the corresponding maximum heating temperatures, the reliability of stress detection of the metal sample is improved.
On the basis of the above embodiment, further, the method for testing dynamic stress in a metal welding process provided by the present invention further includes:
and verifying the dynamic stress test result of the welding thermal simulation experiment of each standard sample at the corresponding highest heating temperature.
Specifically, after obtaining a dynamic stress test result of a welding thermal simulation experiment of each standard sample at the highest heating temperature corresponding to each standard sample, each dynamic stress test result is verified. In order to ensure the validity of the verification, a preset number of times of welding thermal simulation experiments can be performed on each standard sample with the highest heating temperature, so as to obtain a corresponding dynamic stress test result, namely a relation curve of the stress and the temperature of the standard sample, the yield temperature of the material of the corresponding standard sample, the maximum compressive stress at the yield temperature and the final tensile stress can be obtained through the relation curve of the stress and the temperature, the yield temperature, the maximum compressive stress at the yield temperature and the final tensile stress are evaluated within a 95% confidence interval range, and if the evaluation results of the yield temperature, the maximum compressive stress at the yield temperature and the final tensile stress are all within a 95% confidence interval, the dynamic stress test result of the corresponding standard sample with the highest heating temperature is valid. Wherein the preset times are more than or equal to 5 times.
For example, as shown in fig. 3e, the aluminum alloy standard sample with the maximum heating temperature of 510 ℃ is subjected to 5 times of welding thermal simulation tests on a Gleeble3500 thermal simulation testing machine, five corresponding stress-temperature relationship curves are respectively obtained, and the yield temperature, the maximum compressive stress at the yield temperature and the final tensile stress value of the material of the aluminum alloy standard sample with the maximum heating temperature of 510 ℃ are respectively obtained according to the five stress-temperature relationship curves, which is shown in table 2. The validity of the yield temperature, the maximum compressive stress at the yield temperature and the final tensile stress value of the material of the aluminum alloy standard sample at 510 ℃ is evaluated in a 95% confidence interval range, the yield temperature 95% confidence interval is (264.0, 283.8), the maximum compressive stress 95% confidence interval is (-166.4, -134.8) and the final tensile stress 95% confidence interval is (79.2, 100.6) according to formula (1) and formula (2). As can be seen from the data in Table 2, the yield temperature, the maximum compressive stress and the final tensile stress of the aluminum alloy standard sample No. A6S-510-3 at 510 ℃ are not within the 95% confidence interval, the dynamic stress test result of A6S-510-3 is not valid, and the dynamic stress test result of A6S-510-3 should be deleted and supplemented.
Wherein the content of the first and second substances,
represents the mean of the samples, n represents the number of samples, S represents the variance, xiThe sample value is the ith sample value, i is more than or equal to 0 and less than or equal to n, α represents the significance level, 1- α represents the confidence coefficient, and the α value of 95% confidence coefficient is 0.05 which can be obtained by table lookup.
Table 2510 ℃ yield temperature, maximum compressive stress and ultimate tensile stress of aluminium alloy standard specimens
On the basis of the above embodiments, further, the metal profile is an aluminum alloy, and the preset thickness is 4 mm.
FIG. 4 is a schematic structural diagram of a standard sample according to an embodiment of the present invention, and as shown in FIG. 4, in addition to the above embodiments, the width b of the parallel length portion of the standard sample is less than 10mm, and the parallel length L of the standard sample is less than 10mmcLess than 50mm, thickness t of said standard samplea4 mm. Other dimensions of the standard sample are set according to practical experience, and the embodiment of the invention is not limited.
Fig. 4 is a schematic structural diagram of a standard sample according to an embodiment of the present invention, and as shown in fig. 4, on the basis of the above embodiments, the standard sample is a plate-shaped tensile sample with a circular hole, and the circular hole is used for fixing the standard sample during the welding heat simulation experiment.
Specifically, the standard sample is the slabby sample, and thickness is even, and the exposed core processing round hole of standard sample, the round hole is used for fixing standard sample adopts special fixture to pass through the round hole will standard sample fixed mounting be in the control box of thermal simulation testing machine, avoid standard sample is in take place the displacement among the welding thermal simulation experiment process. The diameter of the circular hole can be 5mm, the position of the circular hole at the clamping end is set according to practical experience, and the embodiment of the invention is not limited.
Fig. 5 is a schematic structural diagram of a dynamic stress testing apparatus in a metal welding process according to an embodiment of the present invention, and as shown in fig. 5, the dynamic stress testing apparatus in a metal welding process according to the present invention includes an obtaining unit 501, a determining unit 502, and a testing unit 503, where:
the obtaining unit 501 is configured to perform a welding heat simulation experiment on a metal profile with a preset thickness at different maximum heating temperatures, and obtain a thermal cycle characteristic parameter of the metal profile with the preset thickness at the different maximum heating temperatures; the judging unit 502 is configured to perform a welding thermal simulation experiment on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, and if it is judged that the actual heating speed of the metal sample with the preset size at the maximum heating temperature is consistent with the given heating speed included in the thermal cycle characteristic parameters and the occurring bending deformation is within a preset range, the metal sample with the preset size is a corresponding standard sample with the maximum heating temperature; the thickness of the metal sample with the preset size is the preset thickness; the testing unit 503 is configured to perform a welding thermal simulation experiment on the different standard samples with the highest heating temperature, and obtain a dynamic stress testing result of the welding thermal simulation experiment of each standard sample at the corresponding highest heating temperature.
Specifically, the obtaining unit 501 performs a welding thermal simulation experiment on the metal section with a preset thickness at different maximum heating temperatures by using a Gleelbe-3500 thermal simulation testing machine, so as to obtain a thermal cycle curve of the metal section at each maximum heating temperature. And obtaining the characteristic parameters of the thermal cycle corresponding to each thermal cycle according to the thermal cycle curve at the highest heating temperature. Wherein the maximum heating temperature may be 400 ℃, 450 ℃, 470 ℃, 490 ℃, 510 ℃ and 550 ℃; the preset thickness is selected according to actual needs, and the embodiment of the invention is not limited; the maximum heating temperature is a heating peak temperature at which the sample is heated in the welding thermal simulation experiment.
After obtaining the thermal cycle characteristic parameters at different maximum heating temperatures, the determining unit 502 performs a welding thermal simulation experiment on a plurality of groups of metal samples with preset sizes by using a Gleelbe-3500 thermal simulation testing machine and a welding thermal simulation experiment program written according to the thermal cycle characteristic parameters at the maximum heating temperatures under each maximum heating temperature and using a displacement control method, so as to obtain an actually measured heating speed and a bending deformation of each metal sample at each maximum heating temperature. The determining unit 502 compares the measured heating rate of a certain metal sample at the maximum heating temperature with a given heating rate included in the thermal cycle characteristic parameter at the maximum heating temperature, and if the measured heating rate is consistent with the given acceleration, that is, the measured heating rate is equal to the given acceleration or the measured heating rate is within a set range of the given acceleration, and the bending deformation amount of the certain metal sample is within a preset range, the certain metal sample is the standard sample at the maximum heating temperature. The thickness of the standard sample with the preset size is the preset thickness; the preset range is set according to actual experience, and the embodiment of the invention is not limited; the setting range of the given acceleration is set according to practical experience, and the embodiment of the invention is not limited. It will be appreciated that the metal coupon is derived from the metal profile.
The dynamic stress testing device for the metal welding process can respectively carry out welding heat simulation experiments on metal sections with preset thickness at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal sections with the preset thickness at different maximum heating temperatures, respectively carry out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to the respective heat cycle characteristic parameters at different maximum heating temperatures, obtain standard samples with the maximum heating temperatures after judging that the actually measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included in the heat cycle characteristic parameters and the generated bending deformation is within the preset range, respectively carry out welding heat simulation experiments on the standard samples with different maximum heating temperatures to obtain the dynamic stress testing results of the standard samples in the welding process at the corresponding maximum heating temperatures, the reliability of stress detection of the metal sample is improved.
Fig. 6 is a schematic structural diagram of a dynamic stress testing apparatus in a metal welding process according to another embodiment of the present invention, and as shown in fig. 6, the dynamic stress testing apparatus in a metal welding process according to the present invention further includes a verification unit 504, where:
the verification unit 504 is configured to verify a dynamic stress test result of the welding thermal simulation experiment of each of the standard samples at the corresponding highest heating temperature.
Specifically, after obtaining the dynamic stress test result of the welding thermal simulation experiment of each of the standard samples at the respectively corresponding highest heating temperature, the verification unit 504 verifies each of the dynamic stress test results. In order to ensure the validity of the verification, a preset number of welding thermal simulation experiments may be performed on each of the standard samples with the highest heating temperature, so as to obtain corresponding dynamic stress test results, that is, a relation curve of stress and temperature of the standard samples, the verification unit 504 may obtain, through the relation curve of stress and temperature, a yield temperature, a maximum compressive stress at the yield temperature, and a final tensile stress of the material of the corresponding standard sample, evaluate the yield temperature, the maximum compressive stress at the yield temperature, and the final tensile stress within a 95% confidence interval range, and if the evaluation results of the yield temperature, the maximum compressive stress at the yield temperature, and the final tensile stress are all within a 95% confidence interval, the dynamic stress test results of the corresponding standard samples with the highest heating temperature are valid. Wherein the preset times are more than or equal to 5 times.
On the basis of the above embodiments, further, the standard sample is a plate-shaped tensile sample with a round hole, and the round hole is used for fixing the standard sample during the welding heat simulation experiment.
Specifically, the standard sample is the slabby sample, and thickness is even, and the exposed core processing round hole of standard sample, the round hole is used for fixing standard sample adopts special fixture to pass through the round hole will standard sample fixed mounting be in the control box of thermal simulation testing machine, avoid standard sample is in take place the displacement among the welding thermal simulation experiment process. The diameter of the circular hole can be 5mm, the position of the circular hole at the clamping end is set according to practical experience, and the embodiment of the invention is not limited.
The embodiment of the apparatus provided in the present invention may be specifically configured to execute the processing flows of the above method embodiments, and the functions of the apparatus are not described herein again, and refer to the detailed description of the above method embodiments.
Fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 7, the electronic device includes a processor 701, a memory 702 and a communication bus 703;
the processor 701 and the memory 702 complete mutual communication through a communication bus 703;
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising: respectively carrying out welding heat simulation experiments on metal profiles with preset thicknesses at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal profiles with the preset thicknesses at the different maximum heating temperatures; respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, and if the fact that the actually measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included in the thermal cycle characteristic parameters and the generated bending deformation is in a preset range is judged and obtained, the metal samples with the preset sizes are corresponding standard samples with the maximum heating temperatures; the thickness of the metal sample with the preset size is the preset thickness; and respectively carrying out welding thermal simulation experiments on the different standard samples with the highest heating temperature to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the highest heating temperatures corresponding to the standard samples.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the above method embodiments, for example, including: respectively carrying out welding heat simulation experiments on metal profiles with preset thicknesses at different maximum heating temperatures to obtain heat cycle characteristic parameters of the metal profiles with the preset thicknesses at the different maximum heating temperatures; respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, and if the fact that the actually measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included in the thermal cycle characteristic parameters and the generated bending deformation is in a preset range is judged and obtained, the metal samples with the preset sizes are corresponding standard samples with the maximum heating temperatures; the thickness of the metal sample with the preset size is the preset thickness; and respectively carrying out welding thermal simulation experiments on the different standard samples with the highest heating temperature to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the highest heating temperatures corresponding to the standard samples.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer (which may be a personal computer, an apparatus, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A dynamic stress testing method in a metal welding process is characterized by comprising the following steps:
respectively carrying out welding heat simulation experiments on metal profiles with preset thicknesses at different highest heating temperatures to obtain heat cycle characteristic parameters of the metal profiles with the preset thicknesses at the different highest heating temperatures, wherein the highest heating temperature is the heating peak temperature for heating a sample in the welding heat simulation experiments;
respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, and if the fact that the actually measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included in the thermal cycle characteristic parameters and the generated bending deformation is in a preset range is judged and obtained, the metal samples with the preset sizes are corresponding standard samples with the maximum heating temperatures; the thickness of the metal sample with the preset size is the preset thickness;
and respectively carrying out welding thermal simulation experiments on the different standard samples with the highest heating temperature to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the highest heating temperatures corresponding to the standard samples.
2. The method of claim 1, further comprising:
and verifying the dynamic stress test result of the welding thermal simulation experiment of each standard sample at the corresponding highest heating temperature.
3. The method according to claim 1, characterized in that said metal profile is an aluminium alloy and said predetermined thickness is 4 mm.
4. The method of claim 3, wherein the width of the parallel length portion of the standard specimen is less than 10mm and the parallel length of the standard specimen is less than 50 mm.
5. The method according to any one of claims 1 to 4, wherein the standard specimen is a plate-like tensile specimen with a round hole for fixing the standard specimen during the welding thermal simulation experiment.
6. A metal welding process dynamic stress testing device is characterized by comprising:
the device comprises an obtaining unit, a calculating unit and a processing unit, wherein the obtaining unit is used for respectively carrying out welding heat simulation experiments on metal profiles with preset thicknesses at different highest heating temperatures to obtain heat cycle characteristic parameters of the metal profiles with the preset thicknesses at the different highest heating temperatures, and the highest heating temperature is the heating peak temperature for heating a sample in the welding heat simulation experiments;
the judgment unit is used for respectively carrying out welding heat simulation experiments on a plurality of groups of metal samples with preset sizes according to respective thermal cycle characteristic parameters at different maximum heating temperatures, and if the fact that the actually-measured heating speed of the metal samples with the preset sizes at the maximum heating temperatures is consistent with the given heating speed included by the thermal cycle characteristic parameters and the generated bending deformation is within a preset range is judged and obtained, the metal samples with the preset sizes are corresponding standard samples with the maximum heating temperatures; the thickness of the metal sample with the preset size is the preset thickness;
and the test unit is used for respectively carrying out welding thermal simulation experiments on the different standard samples with the highest heating temperature to obtain dynamic stress test results of the welding thermal simulation experiments of the standard samples at the respectively corresponding highest heating temperature.
7. The apparatus of claim 6, further comprising a verification unit, wherein:
the verification unit is used for verifying the dynamic stress test result of the welding thermal simulation experiment of each standard sample at the corresponding highest heating temperature.
8. The apparatus according to claim 6 or 7, wherein the standard sample is a plate-shaped tensile sample with a round hole for fixing the standard sample during the welding thermal simulation experiment.
9. An electronic device, comprising: a processor, a memory, and a communication bus, wherein:
the processor and the memory are communicated with each other through the communication bus;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 5.
10. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1 to 5.
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