Verification method for induction brazing protection effect of medical gas copper pipe

Abstract

The invention relates to the technical field of welding, in particular to a medical gas copper pipe induction brazing protection effect verification method which comprises the following steps: selecting a copper pipe with a set length, and marking a plurality of marks at equal intervals along the axial direction of the copper pipe; under the condition of no ventilation, heating the copper pipe by using a heating device, measuring the heating temperature, and respectively recording the heating time T1, T2, T3 and T4 when the heating temperature of the copper pipe reaches 650 DEG C, 700 DEG C, 750 DEG C and 800 DEG C; inert gas is introduced into the copper pipe, the flow of the inert gas is controlled to be a first set value, and a heating device is used for sequentially conducting heating for T1 time at the first marking position, conducting heating for T2 time at the second marking position, conducting heating for T3 time at the third marking position and conducting heating for T4 time at the fourth marking position; the flow of the inert gas is controlled to be a second set value; the flow of the inert gas is controlled to be a third set value; and recording the mark position of which the oxidation degree meets the standard. According to the method, construction acceptance and use of medical gas copper pipe brazing can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a method for verifying the protective effect of induction brazing of medical gas copper tubes. Background Technology

[0002] Copper pipes for medical gases should be brazed, with flame brazing being the primary method used in actual construction. This requires the use of inert gases such as argon or nitrogen for protection during the brazing process. However, flame brazing demands high skill and experience from the welder, and precise control of heating temperature, time, and range is difficult. Therefore, even with argon or nitrogen protection inside the copper pipe, severe internal oxidation cannot be completely avoided, affecting final acceptance and use.

[0003] Therefore, a method for verifying the protective effect of induction brazing of medical gas copper tubes is needed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a method for verifying the protective effect of induction brazing of medical gas copper tubes. This method can simulate and verify the protective effect inside the copper tube under different heating times, heating temperatures, and gas flow rates, thereby effectively guiding the brazing of medical gas copper tubes and ensuring the construction, acceptance, and use of brazed medical gas copper tubes.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A method for verifying the protective effect of induction brazing on medical gas copper tubes includes the following steps:

[0007] S1. Select a copper tube of a set length and mark multiple marks at equal intervals along the axial direction of the copper tube;

[0008] S2. Without ventilation, heat the copper tube using a heating device and measure the heating temperature. Record the heating time when the copper tube reaches 650℃, 700℃, 750℃, and 800℃ as T1, T2, T3, and T4, respectively.

[0009] S3. Inert gas is introduced into the copper tube, and the flow rate of the inert gas is controlled to a first set value. The heating device is used to heat the first mark for time T1, the second mark for time T2, the third mark for time T3, and the fourth mark for time T4 in sequence.

[0010] S4. Control the flow rate of the inert gas to the second set value, and use the heating device to heat the fifth mark for time T1, the sixth mark for time T2, the seventh mark for time T3, and the eighth mark for time T4 in sequence.

[0011] S5. Control the flow rate of the inert gas to the third set value, and use the heating device to heat the ninth mark for time T1, the tenth mark for time T2, the eleventh mark for time T3, and the twelfth mark for time T4 in sequence.

[0012] S6. Cut the cooled copper tube along the axial direction, compare the degree of oxidation inside the copper tube at all the marked locations, and record the marked locations where the degree of oxidation meets the standard.

[0013] In some embodiments, all types of copper pipes involved in the construction process are tested as described in steps S1-S6.

[0014] In some embodiments, in step S2, a temperature sensor is used to detect the temperature of the copper tube.

[0015] In some embodiments, in step S2, before heating to the next temperature value, the copper tube is first cooled to room temperature.

[0016] In some embodiments, in step S2, the heating device is an induction heating coil.

[0017] In some embodiments, in steps S3-S5, the copper tube needs to be cooled to room temperature after each heating before the next heating is performed.

[0018] In some embodiments, before step S6, the flow rate of the inert gas needs to be controlled to a fourth set value, and the heating device is used to heat the thirteenth mark for time T1, the fourteenth mark for time T2, the fifteenth mark for time T3, and the sixteenth mark for time T4.

[0019] In some embodiments, the first setting value, the second setting value, the third setting value, and the fourth setting value increase sequentially.

[0020] In some embodiments, the inert gas is nitrogen or argon.

[0021] In some embodiments, in step S1, the markings are made on the copper tube using a marker.

[0022] The beneficial effects of this invention are:

[0023] This invention provides a method for verifying the protective effect of induction brazing of medical gas copper tubes. A copper tube of a predetermined length is selected, and multiple marks are made at equal intervals along the axial direction of the tube. Without gas flow, the copper tube is heated using a heating device, and the heating temperature is measured. The heating times when the copper tube reaches 650℃, 700℃, 750℃, and 800℃ are recorded as T1, T2, T3, and T4, respectively. Inert gas is introduced into the copper tube, and the flow rate is controlled to a first predetermined value. The heating device is used to sequentially heat the tube at the first mark for T1 time, at the second mark for T2 time, at the third mark for T3 time, and at the fourth mark for T4 time. Then, the flow rate of the inert gas is controlled to a second predetermined value, and the heating device is used to sequentially heat the tube at the fifth mark for T1 time, at the sixth mark for T2 time, at the seventh mark for T3 time, and at the eighth mark for T4 time. The inert gas flow rate was controlled to a third set value. The heating device was used to sequentially heat the copper tube at the ninth mark for time T1, the tenth mark for time T2, the eleventh mark for time T3, and the twelfth mark for time T4. Finally, the cooled copper tube was cut axially, and the degree of oxidation inside the copper tube at all marked locations was compared. The marks where the oxidation degree met the standard were recorded. This method verifies the internal protection effect of the copper tube during brazing under different heating temperatures, heating times, and gas flow rates. By using the recorded marks that met the standard, the corresponding gas flow rate, heating temperature, and time were obtained, which can guide subsequent copper tube brazing work, effectively ensuring the cleanliness of the copper tube's interior after brazing. This is helpful for the certification and use of copper tube induction brazing welding process evaluation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 This is a flowchart of a method for verifying the protective effect of induction brazing of medical gas copper tubes according to the present invention. Detailed Implementation

[0026] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0027] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0028] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0029] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0030] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0031] To simulate and verify the protective effect inside the copper tube under different heating times, temperatures, and gas flow rates during brazing, and thus effectively guide the brazing of medical gas copper tubes, ensuring the construction, acceptance, and use of brazed medical gas copper tubes, such as... Figure 1 As shown, this invention provides a method for verifying the protective effect of induction brazing on medical gas copper tubes. The method includes the following steps:

[0032] S1. Select a copper tube of a set length and mark multiple marks at equal intervals along the axial direction of the copper tube;

[0033] S2. Without ventilation, heat the copper tube using a heating device and measure the heating temperature. Record the heating time when the copper tube reaches 650℃, 700℃, 750℃, and 800℃ as T1, T2, T3, and T4, respectively.

[0034] S3. Inert gas is introduced into the copper tube and the flow rate of the inert gas is controlled to the first set value. The heating device is used to heat the first mark for time T1, the second mark for time T2, the third mark for time T3, and the fourth mark for time T4 in sequence.

[0035] S4. Control the flow rate of the inert gas to the second set value, and use the heating device to heat at the fifth mark for time T1, at the sixth mark for time T2, at the seventh mark for time T3, and at the eighth mark for time T4 in sequence.

[0036] S5. Control the flow rate of the inert gas to the third set value, and use the heating device to heat the gas at the ninth mark for time T1, at the tenth mark for time T2, at the eleventh mark for time T3, and at the twelfth mark for time T4 in sequence.

[0037] S6. Cut the cooled copper tube along the axial direction, compare the degree of oxidation inside the copper tube at all marked locations, and record the marked locations where the degree of oxidation meets the standard.

[0038] The above method verifies the internal protection effect of copper tubes during brazing under different heating temperatures, heating times, and gas flow rates. By recording the standard-compliant marker positions, the corresponding gas flow rate, heating temperature, and time are obtained, which can guide subsequent copper tube brazing work, effectively ensuring the cleanliness of the copper tube's interior after brazing. This is helpful for the certification and use of copper tube induction brazing welding process evaluation.

[0039] In some embodiments, all types of copper pipes involved in the construction process are tested as described in steps S1-S6. This method allows for testing of all types of copper pipes, thereby obtaining the required temperature, time, and gas flow rate for brazing all types of copper pipes, which can then guide the brazing of the corresponding types of copper pipes.

[0040] In some embodiments, in step S2, a temperature sensor is used to detect the temperature of the copper tube. The probe of the temperature sensor can directly contact the copper tube to collect temperature data, or an infrared temperature sensor can be used to detect the temperature of the copper tube remotely. Through these methods, the real-time temperature of the copper tube can be effectively obtained during the heating process.

[0041] In some embodiments, in step S2, before heating to the next temperature value, the copper tube is first cooled to room temperature. In this embodiment, room temperature refers to a temperature between 20°C and 25°C. This method avoids the copper tube being affected by the residual heat from the previous heating when heating to the next temperature value, thereby ensuring the accuracy of the obtained time values ​​T1, T2, T3, and T4.

[0042] In some embodiments, in step S2, the heating device is an induction heating coil. The working principle of an induction heating coil is based on the phenomenon of electromagnetic induction. When the induction heating coil is connected to a power source, the power source provides alternating current to the induction heating coil. The alternating current flowing through the induction heating coil generates an alternating magnetic field passing through the workpiece. This magnetic field induces eddy currents in the workpiece, and the energy of these eddy currents is used to heat the workpiece. When a rapidly changing current flows through a copper tube, a skin effect occurs, concentrating the current on the surface of the copper tube and generating a high-temperature heat source on the surface, thereby effectively heating the copper tube. Furthermore, using an induction heating coil facilitates movement along the extension direction of the copper tube, allowing heating at different points on the copper tube.

[0043] In some embodiments, in steps S3-S5, the copper tube needs to be cooled to room temperature after each heating before the next heating is performed. This arrangement also avoids the previous heating affecting the next heating of the copper tube, ensuring the accuracy of the test process.

[0044] In some embodiments, before step S6, the flow rate of the inert gas needs to be controlled to a fourth preset value, and the heating device is used to heat the copper tube sequentially at the thirteenth mark for time T1, the fourteenth mark for time T2, the fifteenth mark for time T3, and the sixteenth mark for time T4. This method can further enrich the data for copper tube testing under different inert gas flow rates.

[0045] In some embodiments, the first, second, third, and fourth set values ​​increase sequentially. In this embodiment, the first set value is 10 L / min, the second set value is 15 L / min, the third set value is 20 L / min, and the fourth set value is 25 L / min. By testing copper tube welding under different inert gas flow rates, various working conditions can be simulated, thereby obtaining better data on the successful brazing under different conditions. In this embodiment, reasonable copper tube brazing data are: 1. 650℃, gas flow rate 10 L / min; 2. 700℃, gas flow rate 15 L / min; 3. 750℃, gas flow rate 20 L / min; 5. 800℃, gas flow rate 25 L / min. In other embodiments, different values ​​for the first, second, third, and fourth set values ​​can be set according to actual needs, without further restrictions.

[0046] In some embodiments, the inert gas is nitrogen or argon. Both nitrogen and argon can provide a similar inert environment to some extent, but their properties and application characteristics differ. In actual use, the choice should be made according to specific needs, and no further restrictions are imposed here.

[0047] In some embodiments, in step S1, a marker is used to mark the copper tube. This method facilitates observation and movement of the heating device when heating different marked areas.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for verifying the protective effect of induction brazing on medical gas copper tubes, characterized in that, Includes the following steps: S1. Select a copper tube of a set length and mark multiple marks at equal intervals along the axial direction of the copper tube; S2. Without ventilation, heat the copper tube using a heating device and measure the heating temperature. Record the heating time when the copper tube reaches 650℃, 700℃, 750℃, and 800℃ as T1, T2, T3, and T4, respectively. S3. Inert gas is introduced into the copper tube, and the flow rate of the inert gas is controlled to a first set value. The heating device is used to heat the first mark for time T1, the second mark for time T2, the third mark for time T3, and the fourth mark for time T4 in sequence. S4. Control the flow rate of the inert gas to the second set value, and use the heating device to heat the fifth mark for time T1, the sixth mark for time T2, the seventh mark for time T3, and the eighth mark for time T4 in sequence. S5. Control the flow rate of the inert gas to the third set value, and use the heating device to heat the ninth mark for time T1, the tenth mark for time T2, the eleventh mark for time T3, and the twelfth mark for time T4 in sequence. S6. Cut the cooled copper tube along the axial direction, compare the degree of oxidation inside the copper tube at all the marked locations, and record the marked locations where the degree of oxidation meets the standard.

2. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, All copper pipes of various models involved in the construction process were tested as described in steps S1-S6.

3. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, In step S2, a temperature sensor is used to detect the temperature of the copper tube.

4. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, In step S2, before heating to the next temperature value, the copper tube is first cooled to room temperature.

5. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, In step S2, the heating device is an induction heating coil.

6. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, In steps S3-S5, after each heating, the copper tube needs to be cooled to room temperature before the next heating is performed.

7. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, Before step S6, the flow rate of the inert gas needs to be controlled to the fourth set value, and the heating device is used to heat the thirteenth mark for time T1, the fourteenth mark for time T2, the fifteenth mark for time T3, and the sixteenth mark for time T4.

8. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 7, characterized in that, The first setting value, the second setting value, the third setting value, and the fourth setting value increase sequentially.

9. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, The inert gas is nitrogen or argon.

10. The method for verifying the protective effect of induction brazing of medical gas copper tubes according to claim 1, characterized in that, In step S1, the markings are made on the copper tube using a marker.

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