A method and system for acquiring copper tube welding parameters

Abstract

The application discloses a copper pipe welding parameter acquisition method and system, the method comprises the following steps: acquiring a first length verification copper pipe with the same specification as the actual welding required copper pipe, and dividing the verification copper pipe into a plurality of first to N verification areas; in the state that the verification copper pipe is not aerated, a first verification step is performed on the first area; in the verification copper pipe, protective gas is sequentially introduced according to a preset flow gradient, and a second verification step is sequentially performed on S adjacent verification areas under different flow rates; acquiring oxidation information in the verification copper pipe, generating a welding parameter reference table of the current verification copper pipe based on the oxidation information; and acquiring the welding parameter of the current welding copper pipe based on the welding parameter reference table. The disclosure can effectively verify the internal protection effect of the copper pipe during brazing under various heating temperatures, heating times and gas flow conditions, and is helpful for the authentication and use of the copper pipe induction brazing welding process evaluation.

Description

Technical Field

[0001] This application relates to the field of pipeline welding technology, and in particular to a method and system for obtaining copper pipe welding parameters. Background Technology

[0002] Brazing is required when welding gas-insulated copper pipes. Flame brazing has become the mainstream method for on-site construction due to its flexibility and ease of use. To reduce oxidation of the inner wall of the copper pipe during welding, construction specifications require the introduction of inert gases such as argon or nitrogen into the copper pipe for protection during brazing.

[0003] Currently, flame brazing of existing gas-fired copper pipes relies heavily on the skill and experience of the welder. However, precise control of heating temperature, time, and range during the welding process is difficult, easily leading to uneven solder distribution and insufficient joint strength. Even with inert gas protection during heating, the instability of flame heating and the limitations of gas protection cannot completely prevent severe internal oxidation of the copper pipe; the residual oxide layer affects the pipe's cleanliness and corrosion resistance.

[0004] The welding parameters required for different types of copper tubes vary. Different heating temperatures, heating times, and gas flow rates all have different effects on the protective effect. Due to the closed structure of copper tubes, it is difficult to directly detect the internal oxidation during and after welding. This leads to the determination of reasonable welding parameters relying on repeated experiments, and the parameter control during construction lacks real-time feedback. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for obtaining copper pipe welding parameters, which can solve the above-mentioned problems existing in the prior art.

[0006] To achieve the above objectives, this application adopts the following technical solution: On the one hand, a method for obtaining copper pipe welding parameters is provided, which includes: Step S10: Obtain a first-length verification copper pipe with the same specifications as the copper pipe required for actual welding, and divide the verification copper pipe into multiple adjacent verification zones. The verification zones are defined sequentially along the axial direction of the verification copper pipe as Zone 1, Zone 2, ..., Zone M, Zone M+1, ..., Zone M+S, ..., Zone N. Step S20: When the verification copper tube is in a non-ventilated state, perform the first verification step on the first zone; The first verification step includes: heating the first zone and recording the time T when the temperature of the first zone reaches different temperature nodes within the first temperature range, wherein the time T includes the time T1 of the first temperature node, the time T2 of the second temperature node, ... the time TS of the Sth temperature node; Step S30: Introduce protective gas into the verification copper tube according to a preset flow gradient, and perform the second verification step on S adjacent verification zones at different flow rates. The second verification step includes: heating the Mth to M+Sth regions respectively for heating times T1, T2...TS; Step S40: Obtain oxidation information inside the verification copper tube, and generate a welding parameter comparison table for the current verification copper tube based on the oxidation information; Step S50: Based on the welding parameter comparison table, obtain the welding parameters of the current copper pipe being welded.

[0007] In one embodiment, in step S10, the lengths of adjacent verification areas are the same.

[0008] In one embodiment, heating the verification copper tube in steps S20 and S30 includes: An open-type induction heating coil is used, and the heating coil is placed on the corresponding verification area of ​​the verification copper tube, and the heating power of the induction heating coil is constant during heating.

[0009] In one embodiment, the first temperature range is 650-800°C.

[0010] In one embodiment, the length of the verification area is 100 mm.

[0011] In one embodiment, the initial flow rate of the protective gas is 10 L / min.

[0012] In one embodiment, in step S30, when heating the adjacent verification area, the subsequent verification area should be heated only after the temperature of the verification copper tube has dropped to room temperature.

[0013] In one embodiment, step 40 includes: Step S410: Divide the verification copper tube in two along the plane including its axis; Step S420: Obtain image data of the inner wall of the verification copper tube, input the image data into a trained neural network recognition model, and analyze and obtain the degree of oxidation at different locations based on the neural network recognition model; Step S430: Output the color difference ΔE for different verification areas according to the level of oxidation, wherein the color difference ΔE ranges from 1 to 20; Step S440: Based on the color difference ΔE, generate a reference table of welding parameters for the current verification copper tube.

[0014] In one embodiment, step S430 includes: The colors of different levels of oxidized regions and the unoxidized matrix were converted to the CIELAB color space, and the color difference ΔE was calculated:

[0015]

[0016]

[0017]

[0018] Where L* is the brightness factor, representing the lightness or darkness of the color; a* is the red-green axis chromaticity coordinate; and b* is the blue-yellow axis chromaticity coordinate.

[0019] On the other hand, this disclosure also provides a system for performing the copper tube welding parameter acquisition method described above, comprising: The raw material preparation module is used to obtain a first-length verification copper tube with the same specifications as the copper tube required for actual welding, and to divide the verification copper tube into multiple adjacent verification zones. The verification zones are defined sequentially along the axial direction of the verification copper tube as Zone 1, Zone 2, ..., Zone M, Zone M+1, ..., Zone M+S, ..., Zone N. The first verification module is used to perform a first verification step on the first zone when the verification copper tube is in a non-ventilated state. The first verification step includes: heating the first zone and recording the time T when the temperature of the first zone reaches different temperature nodes within the first temperature range, wherein the time T includes the time T1 of the first temperature node, the time T2 of the second temperature node, ... the time TS of the Sth temperature node; The second verification module is used to sequentially introduce protective gas into the verification copper tube according to a preset flow gradient, and to perform the second verification step on S adjacent verification zones at different flow rates. The second verification step includes: heating the Mth to M+Sth regions respectively for heating times T1, T2...TS; The data processing module is used to acquire oxidation information inside the verification copper tube and generate a welding parameter comparison table of the current verification copper tube based on the oxidation information. The data output module is used to obtain the welding parameters of the current copper pipe based on the welding parameter lookup table.

[0020] The beneficial effects of this application are as follows: 1. It can effectively verify the internal protection effect of copper tubes during brazing under various heating temperatures, heating times, and gas flow rates.

[0021] 2. It can precisely control the induction brazing heating time and the flow rate of argon or nitrogen gas inside the copper tube, completely avoiding severe oxidation inside the copper tube and ensuring the construction acceptance and use of the copper tube brazing.

[0022] 3. The complete copper tube brazing parameter table formed after verification can effectively ensure the cleanliness of the tube's interior after brazing by simply following the parameters in the table during subsequent welding processes. This is helpful for the certification and use of copper tube induction brazing welding process evaluation. Attached Figure Description

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the copper tube structure used in Embodiment 1 of this application. Figure 2 This is a schematic diagram of the structure of the verification copper tube after it has been cut open according to Embodiment 1 of this application; Figure 3 This is a flowchart illustrating the method for obtaining copper tube welding parameters according to Embodiment 1 of this application; Figure 4 This is a flowchart illustrating step S40 of the method for obtaining copper tube welding parameters in Embodiment 1 of this application. Figure 5 This is a schematic diagram of the module structure of the copper tube welding parameter acquisition system in Embodiment 1 of this application. Detailed Implementation

[0025] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] like Figure 1 and Figure 4 As shown, this disclosure provides a method for obtaining copper pipe welding parameters. This method allows for the accurate acquisition of welding time, welding temperature, and shielding gas flow rate values ​​required for welding copper pipes of different specifications. This provides a reference data basis for subsequent copper pipe welding.

[0029] Specifically, the method for obtaining copper pipe welding parameters includes at least the following steps.

[0030] First, execute step S10 to obtain a first-length verification copper pipe with the same specifications as the copper pipe required for actual welding, and divide the verification copper pipe into multiple adjacent verification zones. The verification zones are defined sequentially along the axial direction of the verification copper pipe as Zone 1, Zone 2, ..., Zone M, Zone M+1, ..., Zone M+S, ..., Zone N.

[0031] For example, in one embodiment, a first verification copper tube with a length of 1700 mm can be cut and divided into 17 equally spaced verification zones. It is understood that each verification zone is 100 mm long, and the 17 verification zones are defined as zones 1 to 17 along the axial direction of the verification copper tube.

[0032] It should be noted that the 17 verification areas are divided into 5 verification units. The first verification unit only includes area 1, and the subsequent first to fourth verification units each include 4 verification areas.

[0033] However, this is not the only option; the verification area may be divided according to actual needs.

[0034] Understandably, the copper tube is divided into multiple adjacent verification zones along the axis, with each zone serving as an independent testing unit for welding parameters. By applying different welding conditions to different zones, the welding effects of each zone can be systematically compared, avoiding the random errors of a single test point and thus accurately identifying the optimal parameter combination. Furthermore, dividing the verification zone into 5 units in a "1+4×4" manner facilitates gradient testing of the parameters.

[0035] For example, different temperature gradients can be set for different units, and different welding times or gas flow rates can be set for different zones within the same unit, forming a matrix-style testing scheme that efficiently covers multiple parameter combinations and improves testing efficiency and data integrity.

[0036] Furthermore, to facilitate the identification of different verification areas, it is permissible to separate adjacent verification areas by drawing lines.

[0037] Then, step S20 is executed, and the first verification step is performed on zone 1 while verifying that the copper tube is in a non-ventilated state.

[0038] The first verification step includes: heating the first zone and recording the time T when the temperature of the first zone reaches different temperature nodes within the first temperature range. The time T includes the time T1 of the first temperature node, the time T2 of the second temperature node, ... the time TS of the Sth temperature node.

[0039] For example, in one embodiment, the first temperature range includes 650-800°C. Simultaneously, the temperature of the first temperature node is 650°C, the temperature of the second temperature node is 700°C, the temperature of the third temperature node is 750°C, and the temperature of the fourth temperature node is 800°C. Multiple temperature nodes are set within the first temperature range, and the arrival time of each node is recorded, establishing a quantitative correspondence between "temperature" and "time." This data can be directly used to set the time parameters for temperature control during subsequent welding processes.

[0040] When heating Zone 1, an open-type induction heating coil may be used, and the coil is placed over the corresponding verification area of ​​the verification copper tube. The heating power of the induction heating coil remains constant during heating. It is important to note that in subsequent steps of heating the verification copper tube, the heating power of the induction heating coil remains constant and is the same as that in step S10. Using a constant-power open-type induction heating coil, coaxially positioned with the copper tube, ensures uniform heat conduction during heating, avoiding temperature field deviations caused by power fluctuations or eccentric heating, thus laying the foundation for accurate temperature-time data.

[0041] It is important to note that during the heating process of the induction heating coil on the verification copper tube, the induction heating coil and the verification copper tube are coaxially aligned. This ensures that the verification coil is heated stably during the heating process.

[0042] The test under non-ventilated conditions eliminates the interference of protective gas on heat conduction, so that the temperature rise curve only reflects the relationship between the copper tube material and the heating power, forming pure reference data.

[0043] Furthermore, in step S30, protective gas is sequentially introduced into the verification copper tube according to a preset flow gradient, and the second verification step is performed on S adjacent verification areas at different flow rates.

[0044] The second verification step includes heating regions M to M+S respectively for heating times T1, T2...TS.

[0045] For example, in one embodiment, the initial flow rate of the protective gas may be allowed to be 10 L / min, and the subsequent initial flow rate gradient may be increased in increments of 5 L / min.

[0046] The flow gradient test covers the fluctuation scenarios that may occur in actual production. By verifying the welding effect under different flow rates, the final parameters can have stronger anti-interference capabilities.

[0047] It should be noted that step S30 may specifically include the following steps.

[0048] Step S310: Inert gas is introduced into the verification copper tube, and the gas flow rate is controlled at 10 L / min. In zone 2 of the second verification unit, the verification copper tube is heated using an induction coil for time T1. After the copper tube cools down, the copper tube is heated using an induction coil in zone 3 for time T2. After the copper tube cools down, the copper tube is heated using an induction coil in zone 4 for time T3. After the copper tube cools down, the copper tube is heated using an induction coil in zone 5 for time T4.

[0049] Step S320: Inert gas is introduced into the verification copper tube, and the gas flow rate is controlled at 15 L / min. In zone 6 of the third verification unit, the verification copper tube is heated using an induction coil for time T1. After the copper tube cools down, it is heated again in zone 7 using an induction coil for time T2. After the copper tube cools down, it is heated again in zone 8 using an induction coil for time T3. After the copper tube cools down, it is heated again in zone 9 using an induction coil for time T4.

[0050] Step S330: Inert gas is introduced into the verification copper tube, and the gas flow rate is controlled at 20 L / min. In zone 10 of the fourth verification unit, the verification copper tube is heated using an induction coil for time T1. After the copper tube cools down, it is heated again using an induction coil in zone 11 for time T2. After the copper tube cools down, it is heated again using an induction coil in zone 12 for time T3. After the copper tube cools down, it is heated again using an induction coil in zone 13 for time T4.

[0051] Step S340: Inert gas is introduced into the verification copper tube, and the gas flow rate is controlled at 25 L / min. In zone 14 of the fifth verification unit, the verification copper tube is heated using an induction coil for time T1. After the copper tube cools down, it is heated again using an induction coil in zone 15 for time T2. After the copper tube cools down, it is heated again using an induction coil in zone 16 for time T3. After the copper tube cools down, it is heated again using an induction coil in zone 17 for time T4.

[0052] Understandably, in steps S310 to S340, the verification zones within them were heated for times T1 to T4 in protective gases at different flow rates. Therefore, the degree of oxidation within the copper tube in different verification zones also differs. Thus, by verifying the degree of oxidation, the optimal parameters for the current copper tube during the actual welding process can be determined.

[0053] Furthermore, step S40 is executed to obtain oxidation information inside the verification copper tube, and a welding parameter comparison table for the current verification copper tube is generated based on the oxidation information.

[0054] Specifically, in step S40, the oxidation state of the copper tube can be determined based on the oxidation color of the inner wall of the copper tube.

[0055] Furthermore, step S40 may specifically include the following steps.

[0056] Step S410: Divide the verification copper tube in two along the plane including its axis.

[0057] Specifically, by splitting the verification copper tube in two, the degree of oxidation within the tube can be more easily confirmed. By dividing the copper tube along its axial plane, the visual blind spot on the inner wall of the cylinder is eliminated, allowing the industrial camera to directly acquire a complete image of the inner wall. Compared to non-destructive testing, this slicing method avoids image distortion caused by light path refraction. Combined with the high resolution and noise reduction performance of the industrial camera, it can capture micron-level oxide film textures.

[0058] Step S420: Obtain image data of the inner wall of the verification copper tube, input the image data into a trained neural network recognition model, and analyze and obtain the degree of oxidation at different locations based on the neural network recognition model.

[0059] It should be noted that in step S420, it is permissible to use an image recognition device to photograph the inner wall of the verification copper tube to obtain image data. For example, an industrial camera may be used. An industrial camera is an image acquisition device designed with industrial standards and capable of operating stably in complex environments. It acquires images of objects through a lens and converts them into digital signals for subsequent image processing system analysis.

[0060] Furthermore, a pre-trained neural network recognition model is provided, which analyzes and obtains the degree of oxidation at different locations.

[0061] Specifically, in one embodiment, the neural network recognition model provided by this disclosure can include convolutional layers and pooling layers, extracting features such as texture, color, and edges of oxidized regions using convolutional kernels of different sizes. Since the goal is to quantify the degree of oxidation and stratify it, multi-classification can be achieved through fully connected layers and the Softmax function. Simultaneously, when locating oxidized regions, a semantic segmentation model can be used to output an oxidation probability map for each pixel.

[0062] Furthermore, the neural network module can classify the oxidation levels of different verification regions.

[0063] Step S430: Output the color difference ΔE for different verification areas according to the degree of oxidation. The range of color difference ΔE is 1 to 20. It should be noted that when ΔE is less than 5, it indicates that the oxidation degree of the current verified copper tube meets the actual use requirements; conversely, it indicates that the oxidation degree of the current verified copper tube does not meet the actual practical requirements.

[0064] Specifically, in the process of obtaining ΔE, it is permissible to convert the colors of oxidized regions of different levels and the unoxidized matrix to the CIELAB color space, and calculate the color difference ΔE, including: ; ; ; ; Where L* is the brightness factor, representing the lightness or darkness of the color; a* is the red-green axis chromaticity coordinate; and b* is the blue-yellow axis chromaticity coordinate.

[0065] Understandably, the CIELAB space is based on the CIE standard illuminance volume definition. It linearly converts RGB values ​​into Lab* coordinates using a formula, which can eliminate color shifts caused by differences in spectral response and fluctuations in ambient light in industrial cameras.

[0066] Meanwhile, by setting a color difference ΔE standard, oxidation detection is upgraded from "qualitative description" to "quantitative analysis", thereby improving the actual verification accuracy.

[0067] Step S440: Based on the color difference ΔE, generate a comparison table of welding parameters for the current verified copper tube.

[0068] Please refer to Table 1 Table 1

[0069] Finally, step S50 is executed to obtain the welding parameters of the current copper pipe based on the welding parameter reference table.

[0070] In step S50, it is permissible to compare the degree of oxidation row by row and column by column in Table 1.

[0071] Specifically, comparing each column reveals the protective effect of different protective gas flow rates on the inside of the copper tube at the same heating temperature. Conversely, comparing each row reveals the protective effect of different heating temperatures at the same protective gas flow rate.

[0072] Specifically, to improve the actual visualization effect, qualified welding parameters may be highlighted.

[0073] For example, in one embodiment, the welding parameters that can be determined to meet the welding adjustment include: 1. 650℃, gas flow rate ≥10L / min; 2. 700℃, gas flow rate ≥15L / min; 3. 750℃, gas flow rate ≥20L / min; 4. 800℃, gas flow rate ≥25L / min.

[0074] Please refer to Table 2 Table 2

[0075] Please see Figure 4 Based on the copper tube welding parameter acquisition method in any of the above embodiments, this disclosure also provides a system capable of executing any of the above copper tube welding parameter acquisition methods, which has the corresponding functional modules and beneficial effects of the execution method.

[0076] Specifically, the system includes a raw material preparation module, a first verification module, a second verification module, a data processing module, and a data output module.

[0077] Specifically, the raw material preparation module is used to obtain a first-length verification copper tube with the same specifications as the copper tube required for actual welding, and to divide the verification copper tube into multiple adjacent verification zones. The verification zones are defined sequentially along the axial direction of the verification copper tube as Zone 1, Zone 2, ..., Zone M, Zone M+1, ..., Zone M+S, ..., Zone N.

[0078] The first verification module is used to perform a first verification step on Zone 1 when the copper tube is in a non-ventilated state. The first verification step includes: heating Zone 1 and recording the time T when the temperature of Zone 1 reaches different temperature nodes within a first temperature range, where time T includes the time T1 of the first temperature node, the time T2 of the second temperature node, ..., the time TS of the Sth temperature node.

[0079] The second verification module is used to sequentially introduce protective gas into the verification copper tube according to a preset flow gradient, and to perform the second verification step on S adjacent verification zones at different flow rates. The second verification step includes heating zones M to M+S respectively for heating times T1, T2...TS.

[0080] The data processing module is used to obtain oxidation information inside the verification copper tube and generate a welding parameter comparison table for the current verification copper tube based on the oxidation information.

[0081] The data output module is used to obtain the welding parameters of the current copper pipe being welded based on the welding parameter lookup table.

[0082] In summary, this disclosure provides a method and system for obtaining copper tube welding parameters, which can verify the internal protection effect of copper tubes during brazing under various heating temperatures, heating times, and gas flow rates. Simultaneously, it can precisely control the induction brazing heating time and the flow rate of argon or nitrogen gas inside the copper tube, completely avoiding severe internal oxidation and ensuring the construction acceptance and use of the brazed copper tubes. Furthermore, the complete copper tube brazing parameter table generated after verification allows for effective maintenance of the cleanliness of the tube's interior after brazing by simply following the parameters in the table during subsequent welding processes. This facilitates the certification and use of copper tube induction brazing welding process evaluation.

[0083] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0084] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0085] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0086] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A method for obtaining copper pipe welding parameters, characterized in that, include: Step S10: Obtain a first-length verification copper pipe with the same specifications as the copper pipe required for actual welding, and divide the verification copper pipe into multiple adjacent verification zones. The verification zones are defined sequentially along the axial direction of the verification copper pipe as Zone 1, Zone 2, ..., Zone M, Zone M+1, ..., Zone M+S, ..., Zone N. Step S20: When the verification copper tube is in a non-ventilated state, perform the first verification step on the first zone; The first verification step includes: heating the first zone and recording the time T when the temperature of the first zone reaches different temperature nodes within the first temperature range, wherein the time T includes the time T1 of the first temperature node, the time T2 of the second temperature node, ... the time TS of the Sth temperature node; Step S30: Introduce protective gas into the verification copper tube according to a preset flow gradient, and perform the second verification step on S adjacent verification zones at different flow rates. The second verification step includes: heating the Mth region to the M+Sth region respectively for heating times T1, T2...TS; Step S40: Obtain oxidation information inside the verification copper tube, and generate a welding parameter comparison table for the current verification copper tube based on the oxidation information; specifically including: Step S410: Divide the verification copper tube in two along the plane including its axis; Step S420: Obtain image data of the inner wall of the verification copper tube, input the image data into a trained neural network recognition model, and analyze and obtain the degree of oxidation at different locations based on the neural network recognition model; Step S430: Based on the degree of oxidation, output the color difference ΔE for different verification areas, where the color difference ΔE ranges from 1 to 20; wherein, the colors of the oxidized areas and the unoxidized substrate at different degrees are converted to the CIELAB color space, and the color difference ΔE is calculated. Where L* is the brightness factor, representing the lightness or darkness of the color; a* is the red-green axis chromaticity coordinate; and b* is the blue-yellow axis chromaticity coordinate; Step S440: Based on the color difference ΔE, generate a reference table of welding parameters for the current verification copper tube; Step S50: Based on the welding parameter comparison table, obtain the welding parameters of the current copper pipe being welded.

2. The method for obtaining copper tube welding parameters according to claim 1, characterized in that, In step S10, the lengths of adjacent verification areas are the same.

3. The method for obtaining copper tube welding parameters according to claim 1, characterized in that, In steps S20 and S30, heating the verification copper tube includes: An open-type induction heating coil is used, and the heating coil is placed on the corresponding verification area of ​​the verification copper tube, and the heating power of the induction heating coil is constant during heating.

4. The method for obtaining copper tube welding parameters according to claim 1, characterized in that, The first temperature range is 650-800℃.

5. The method for obtaining copper tube welding parameters according to claim 1, characterized in that, The length of the verification area is 100mm.

6. The method for obtaining copper tube welding parameters according to claim 1, characterized in that, The initial flow rate of the protective gas is 10 L / min.

7. The method for obtaining copper tube welding parameters according to claim 1, characterized in that, In step S30, when heating the adjacent verification area, the subsequent verification area should only be heated after the temperature of the verification copper tube has dropped to room temperature.

8. A system capable of performing the method for obtaining copper tube welding parameters according to any one of claims 1 to 7, characterized in that, include: The raw material preparation module is used to obtain a first-length verification copper tube with the same specifications as the copper tube required for actual welding, and to divide the verification copper tube into multiple adjacent verification zones. The verification zones are defined sequentially along the axial direction of the verification copper tube as Zone 1, Zone 2, ..., Zone M, Zone M+1, ..., Zone M+S, ..., Zone N. The first verification module is used to perform a first verification step on the first zone when the verification copper tube is in a non-ventilated state. The first verification step includes: heating the first zone and recording the time T when the temperature of the first zone reaches different temperature nodes within the first temperature range, wherein the time T includes the time T1 of the first temperature node, the time T2 of the second temperature node, ... the time TS of the Sth temperature node; The second verification module is used to sequentially introduce protective gas into the verification copper tube according to a preset flow gradient, and to perform the second verification step on S adjacent verification zones at different flow rates. The second verification step includes: heating the Mth region to the M+Sth region respectively for heating times T1, T2...TS; The data processing module is used to acquire oxidation information inside the verification copper tube and generate a welding parameter comparison table of the current verification copper tube based on the oxidation information. The data output module is used to obtain the welding parameters of the current copper pipe based on the welding parameter lookup table.

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