CN116329731A - Temperature monitoring method and device for friction stir welding weld joint core area - Google Patents
Temperature monitoring method and device for friction stir welding weld joint core area Download PDFInfo
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- CN116329731A CN116329731A CN202310185422.XA CN202310185422A CN116329731A CN 116329731 A CN116329731 A CN 116329731A CN 202310185422 A CN202310185422 A CN 202310185422A CN 116329731 A CN116329731 A CN 116329731A
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- 238000003466 welding Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 238000012806 monitoring device Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
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- 238000009529 body temperature measurement Methods 0.000 claims description 13
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- 238000003754 machining Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
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- 239000000919 ceramic Substances 0.000 claims description 3
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- 229910021484 silicon-nickel alloy Inorganic materials 0.000 claims description 3
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- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a temperature monitoring device and a temperature monitoring method for a friction stir welding seam core area, wherein a stepped hole is formed in a welding stirring head, thermocouple metal wires are placed in the stepped hole, and the thermocouple metal wires are filled with and coated with high-temperature-resistant insulating materials; the temperature measuring point is positioned on the contact surface of the stirring head and the workpiece, and the thermocouple wire, the stirring head and the workpiece are contacted with each other at the temperature measuring point; the stirring head can be driven by a main shaft of the welding machine to rotate so as to realize welding of the workpiece; the thermocouple metal wire and the stirring head are made of different materials, thermoelectric potential signals of the thermocouple metal wire and the stirring head are measured in the welding process, the signals are amplified through a signal processing circuit board on the taper sleeve and transmitted to external equipment wirelessly, and the signal processing circuit board supplies power through a battery module in the taper sleeve, so that the temperature monitoring of a core area in the welding process is realized. The invention can directly contact the temperature measuring point with the welding material at the contact surface of the stirring head and the workpiece, and can realize the rapid and accurate measurement of the temperature of the core area of the welding line in the welding process.
Description
Technical Field
The invention belongs to the technical field of manufacturing of welding equipment, and particularly relates to a temperature monitoring method and device for a welding seam core area of friction stir welding.
Background
Friction stir welding is a solid state welding technology, has the characteristics of high efficiency, good weld performance, green environmental protection and the like, and is widely applied to the field of aluminum, copper and titanium alloy welding. Friction stir welding generates heat through friction between a stirring head and a workpiece, and the temperature of the contact surface of the stirring head and the workpiece is taken as the temperature of a core region of a welding seam, which is an important factor affecting the quality of the welding seam.
The traditional method for measuring the temperature of the weld joint core area is to embed a thermocouple in a workpiece or a stirring head for measurement, wherein the workpiece is required to be destroyed by embedding a temperature sensor in the workpiece, and the method cannot be popularized and applied in engineering practice.
Thus, some scholars have conducted related studies to realize real-time temperature monitoring during engineering welding by implanting thermocouples inside the stirring head in the following manner: a conventional industry packaged thermocouple (e.g., a k-type sheathed thermocouple) is embedded in the stirring head. The internal structure of the k-type armoured thermocouple is shown in fig. 1, and can be seen to comprise two thermocouple wires made of different materials; the actual temperature measuring point is positioned at the joint of the two thermocouple wires, and meanwhile, the thermocouple wires are covered with a temperature-resistant insulating layer and a stainless steel protective layer, so that the temperature measuring point of the thermocouple in the prior scheme is not in actual contact with the workpiece material. In the friction stir welding process, the stirring head is in a high-speed rotating motion state, and for the currently adopted temperature measurement scheme, the temperature of a welding line core area can reach an actual temperature measurement point only by heat transfer of a stainless steel protection layer and a temperature-resistant heat insulation layer. The heat transfer equation in the homogeneous material is a first-order time-lag differential equation, so that a hysteresis effect exists in the measurement result of the existing temperature measurement scheme, the dynamic performance of the temperature measurement system is poor, and when the temperature of a temperature measurement point changes sharply in the welding process, the temperature measurement precision is obviously reduced.
Disclosure of Invention
In order to solve the problems, the invention discloses a temperature monitoring method of a friction stir welding weld joint core area, which can be realized.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a temperature monitoring device for a friction stir welding seam core area, which comprises:
thermocouple wires; a temperature-resistant insulating layer; a stirring head; a workpiece; a main shaft of the welding machine; a signal processing circuit board;
the thermocouple wires are made of different materials from the stirring heads;
the stirring head is driven by a main shaft of a welder to rotate so as to process a stepped hole in a workpiece; the thermocouple metal wire with the periphery coated with the temperature-resistant insulating layer is placed in the stepped hole, and two end parts of the thermocouple metal wire are exposed, wherein the exposed end at the bottom is flush with the contact surface of the stirring head and the workpiece and contacts with the welded workpiece to form a temperature measuring point; the upper exposed end is connected with the stirring head through a wire to form a conductive loop;
the signal processing circuit board is connected in the conductive loop and used for collecting thermoelectric voltage E signals of the thermocouple metal wire and one end of the stirring head, which is far away from the temperature measuring point; and the acquired thermoelectric voltage E signals are transmitted to an upper computer for storing and presenting data through a signal processing circuit board.
More preferably, the temperature monitoring device further comprises: a main shaft of the welding machine; a taper sleeve; a jacket; the stirring head is fixed in the jacket, the jacket is connected with the taper sleeve, and the taper sleeve is arranged on the main shaft of the welder and synchronously rotates along with the main shaft of the welder.
More preferably, the signal processing circuit board is fixed on the taper sleeve and is powered by a battery module fixed inside the taper sleeve.
More preferably, the signal processing circuit board includes:
the power supply system comprises an amplifier, a signal processing module, a control module and a wireless transmitting module which are sequentially connected in series, and provides power through a power supply module.
The thermoelectric voltage E signal is amplified by an amplifier, then converted into a corresponding digital signal by a signal processing module, and the digital signal is noise-removed and filtered by a control module and then transmitted by a wireless transmitting module.
More preferably, the thermocouple wires are made of nickel-silicon alloy; the stirring head is made of H13 die steel; alumina is used to insulate the ceramic.
The invention also provides a temperature monitoring method of a friction stir welding seam core region, which is realized by applying the temperature monitoring device of the friction stir welding seam core region according to any one of claims 1 to 5, and the temperature monitoring method comprises the following steps:
step S101, machining a stepped hole on a stirring head according to the position of a temperature measurement point of a friction surface of a workpiece to be measured; the small hole section of the stepped hole is close to the temperature detection point;
step S102, a thermocouple wire is selected to be placed in a stepped hole of a stirring head, the exposed end of the bottom of the thermocouple wire is closely contacted with the stirring head at a temperature measuring point, the exposed end of the upper part of the thermocouple wire is connected with a column part of the stirring head through a wire to form a conductive loop, and a signal processing circuit board is connected in the conductive loop; a temperature-resistant insulating material is filled between the rest part of the thermocouple wire and the stirring head; the thermocouple metal wires and the stirring head are made of different materials;
step S103, fixing the stirring head in a jacket, connecting the jacket with a taper sleeve, and mounting the taper sleeve on a main shaft of the welding machine; in the process of welding a workpiece by using the stirring head, the exposed end at the bottom of the thermocouple wire is flush with the stirring head and is simultaneously contacted with the workpiece;
step S104, in the welding process, the thermoelectric voltage difference E between the thermocouple metal wire and the stirring head is collected through the signal processing circuit board and used as a temperature monitoring signal; the signal processing circuit board is fixed on the taper sleeve, a battery module is arranged in the taper sleeve to supply power to the circuit, and the temperature signal wire and the power wire are connected with the circuit board through a jacket and an inner hole of the taper sleeve;
step S105, the detected thermal potential difference E is transmitted to an external upper computer for data storage and presentation by using a signal processing circuit board through an amplifying circuit and a wireless transmission module.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention utilizes the stirring head and the built-in thermocouple metal wire to form the anode and the cathode of the thermoelectric effect, the temperature measuring point is positioned on the friction surface of the stirring head contacted with the workpiece, and meanwhile, the thermocouple metal wire is directly contacted with the workpiece material, so that the rapid temperature change condition on the friction surface of the stirring head and the workpiece can be rapidly and accurately monitored, the dynamic performance of the monitoring result is better, the testing result is more accurate, and the rapid and accurate measurement of the temperature of the welding seam core area in the welding process can be realized.
2. Through setting up a plurality of temperature detection points in the stirring head on different positions, realize the simultaneous measurement of multiple spot temperature.
3. The temperature real-time monitoring in the welding process is realized by designing a signal processing and wireless transmission circuit on the main shaft of the welding machine.
Drawings
FIG. 1 is a schematic diagram of the internal structure of an industrial K-type sheathed thermocouple of the prior art;
FIG. 2 is a schematic diagram of the operation of a temperature monitoring device for friction stir welding of the present invention in the core region of the weld;
FIG. 3 is a schematic diagram of the operation of the signal processing circuit board of the present invention;
FIG. 4 is a schematic diagram of the working principle of the temperature monitoring device for multipoint temperature measurement;
fig. 5 is a schematic structural diagram of a temperature monitoring device for a friction stir welding weld core zone according to the present invention.
In the accompanying drawings:
thermocouple wires 1; a temperature-resistant insulating layer 2; a stirring head 3; a work 4; a welder main shaft 5; a taper sleeve 6; a battery module 7; a signal processing circuit board 8; and a jacket 9.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
The invention provides a temperature monitoring device for a friction stir welding weld joint core zone, as shown in fig. 2-5, comprising: thermocouple wires 1; a temperature-resistant insulating layer 2; a stirring head 3; a work 4; a welder main shaft 5; a taper sleeve 6; a battery module 7; a signal processing circuit board 8; and a jacket 9.
The thermocouple wire 1 is made of a material different from that of the stirring head 3. The thermocouple metal wire 1 is made of nickel-silicon alloy; the stirring head 3 is made of H13 die steel; the work piece 4 is a 6061 aluminum alloy work piece; the temperature-resistant insulating layer 2 is made of alumina insulating ceramic.
The stirring head 3 is fixed in the jacket 9, the jacket 9 is connected with the taper sleeve 6, and the taper sleeve 6 is arranged on the main shaft 5 of the welding machine and synchronously rotates along with the main shaft of the welding machine, so that the stirring head 3 can be driven to rotate.
The stirring head 3 comprises a column body and a stirring pin positioned below the column body; the stirring pin is in a shape of a circular truncated cone and can be embedded into a welding groove of the workpiece 4; the maximum outer diameter of the stirring pin is smaller than the diameter of the cylinder, so that the cylinder forms a shoulder at the position where the stirring pin is not connected; the inside of the stirring head 3 is provided with a stepped hole (namely a stepped hole) by electric spark machining;
the thermocouple metal wire 1 with the periphery coated with the temperature-resistant insulating layer 2 can be placed in the stepped hole, and two end parts of the thermocouple metal wire 1 are exposed, wherein the exposed end at the bottom is flush with and contacted with the shoulder of the stirring head 3 and is contacted with the workpiece 4 to be welded, so that a temperature measuring point is formed; the upper exposed end is connected with the stirring head 3 through a wire to form a conductive loop; diameter d1 (e.g., 1 mm) of thermocouple wire 1; the small diameter hole of the stepped hole can accommodate the exposed end of the bottom of the temperature-resistant insulating layer 2, and the height of the small diameter hole is 0.8d1; the large diameter hole of the stepped hole has a diameter d2, and can accommodate the thermocouple wire 1 covered with the temperature-resistant insulating layer 2.
A signal processing circuit board 8 is connected in the conductive loop and is used for measuring the thermoelectric voltage E of one end of the thermocouple metal wire 1 and the stirring head 3 far away from the temperature measuring point;
the signal processing circuit board 8 is fixed on the cone sleeve 6 and is powered by a battery module 7 fixed inside the cone sleeve 6. The working principle of the signal processing circuit board 8 is shown in fig. 3, and the signal processing circuit board comprises an amplifier, a signal processing module, a control module, a wireless transmitting module and a power supply module which are sequentially connected in series; the power supply module supplies power to the signal processing circuit board 8.
The thermoelectric voltage E signal is amplified by an amplifier, converted into a corresponding digital signal by a signal processing module, filtered by a control module and then transmitted by a wireless transmitting module;
after the upper computer receives the signal through the wireless receiving module, the corresponding signal is stored and presented to the user.
The thermocouple wire 1 at the temperature measuring point and the stirring head 3 are in contact with the contact surface of the workpiece 4, and the rest thermocouple wire 1 is insulated from the stirring head 3 through the peripheral-coated temperature-resistant insulating layer 2. In this way, in the process of welding the workpiece 4 by using the stirring head 3, high temperature can be generated by friction on the contact surface of the stirring head 3 and the workpiece 4, and a thermoelectric effect is formed between the thermocouple wire 1 and the stirring head 3, so that the signal description of the welding temperature at the temperature measuring point can be obtained by measuring the thermoelectric potential E of one end of the thermocouple wire 1 and the stirring head 3 away from the temperature measuring point.
The working principle of the temperature monitoring device for the friction stir welding weld joint core area for implementing the multipoint temperature measurement is shown in fig. 4, three temperature measuring points are respectively arranged on the shoulder of the stirring head 3, the stirring needle of the stirring head 3 and the transition area of the shoulder and the stirring needle, stepped holes are respectively formed in the stirring head 3 aiming at the three temperature measuring points, and a thermocouple metal wire 1 is respectively implanted in each stepped hole to form the structure shown in fig. 4.
In the process of welding the workpiece 4 by using the stirring head 3, three lead wires are led out by taking the stirring head 3 as a common end and are respectively connected with the upper bare drain ends of the three thermocouple wires 1; the bottom bare drain ends of the three thermocouple wires 1 are in contact with the workpiece 4. Because the periphery of each thermocouple wire 1 is coated with the temperature-resistant insulating layer 2, three conductive loops are formed between the three thermocouple wires 1 and the stirring head 3, and based on the structure, a signal processing circuit board 8 is connected in the conductive loops and is used for collecting and identifying thermoelectric voltages E1, E2 and E3 between the three thermocouple wires 1 and the stirring head 3 and describing the thermoelectric voltages as temperature signals of three temperature measuring points.
The invention also provides a temperature monitoring method of the friction stir welding seam core region, which is realized based on the temperature monitoring device. The temperature monitoring method comprises the following steps:
step S101, machining a stepped hole on the stirring head 3 according to the position of a temperature detection point of a friction surface of a workpiece to be measured; the small hole section of the stepped hole is close to the temperature detection point;
step S102, a thermocouple wire 1 is selected to be placed in a stepped hole of a stirring head 3, the bottom bare drain end of the thermocouple wire 1 is tightly contacted with the stirring head 3 at a temperature measuring point position, the upper bare end of the thermocouple wire 1 is connected with a column part of the stirring head through a wire to form a conductive loop, and a signal processing circuit board 8 is connected in the conductive loop; a temperature-resistant insulating material is filled between the rest part of the thermocouple wire 1 and the stirring head 3 to form a temperature-resistant insulating layer 2;
in step S102, preferably, the height of the contact surface of the thermocouple wire 1 and the stirring head 3 at the temperature measurement point (i.e., the height of the bottom bare drain end of the thermocouple wire 1) is 0.1 to 20mm.
The thermocouple wire 1 and the stirring head 3 selected in step S102 are made of different materials, so that a thermoelectric effect can be ensured to be formed between the thermocouple wire 1 and one end of the stirring head 3, which is far away from the temperature measuring point.
Step S103, fixing the stirring head 3 in a jacket, connecting the jacket with a taper sleeve, and installing the taper sleeve on a main shaft of the welding machine. In the process of welding the workpiece 4 by using the stirring head 3, the bottom bare drain end of the thermocouple wire 1 is flush with the stirring head 3 and is simultaneously contacted with the workpiece 4;
step S104, in the welding process, a thermoelectric voltage difference E between the thermocouple wire 1 and the stirring head 3 is collected through a signal processing circuit board 8 in the conductive loop and is used as a temperature monitoring signal; the signal processing circuit board 8 is fixed on the taper sleeve, a battery module is arranged in the taper sleeve to supply power to the circuit, and the temperature signal wire and the power wire are connected with the signal processing circuit board 8 through a jacket and an inner hole of the taper sleeve;
in step S105, the detected thermoelectric voltage difference E is transmitted to an external upper computer data storage and presentation to the user via the amplifying circuit and the wireless transmission module by using the signal processing circuit board 8.
In step S105, the thermoelectric signal E is processed and wirelessly transmitted according to the following scheme: the AD595 chip is adopted to amplify the thermoelectric signals acquired in the welding process of the stirring head 3, the ADS1115 chip is adopted to perform A/D conversion on the signals, the NRF24l01 wireless transmission module is utilized to perform wireless transmission on the signals, the STM32 singlechip is selected as a control chip of the signal processing circuit board 8, and the whole signal processing circuit board 8 is powered by a single lithium battery. At the outer receiving end, the NRF24l01 wireless receiving module is used for receiving the temperature measurement data and transmitting the temperature measurement data to the upper computer for storing and displaying the signals in real time.
The above description is only an application embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and the scope of the claims should not be limited thereto, and any equivalent changes according to the technical solution of the present invention should be covered in the protection scope of the present invention.
Claims (6)
1. The utility model provides a temperature monitoring device of friction stir welding seam core area which characterized in that, temperature monitoring device include:
a thermocouple wire (1); a temperature-resistant insulating layer (2); a stirring head (3); a workpiece (4); a welder spindle (5); a signal processing circuit board (8);
the thermocouple wires (1) are made of different materials from the stirring heads (3);
the thermocouple wire (1) with the periphery coated with the temperature-resistant insulating layer (2) is placed in the stepped hole, two end parts of the thermocouple wire (1) are exposed, wherein the exposed end at the bottom is flush with the contact surface of the stirring head (3) and the workpiece (4) and is contacted with the welded workpiece (4) to form a temperature measuring point;
the signal processing circuit board (8) collects thermoelectric voltage E signals of one end, far away from the temperature measuring point, of the thermocouple metal wire (1) and the stirring head (3); the collected thermoelectric voltage E signals are transmitted to an upper computer for storing and presenting data through a signal processing circuit board (8).
2. The device for monitoring the temperature of a friction stir welding weld core as recited in claim 1, further comprising:
a welder spindle (5); a taper sleeve (6); a jacket (9);
the stirring head (3) is fixed in the jacket (9), the jacket (9) is connected with the taper sleeve (6), and the taper sleeve (6) is arranged on the main shaft (5) of the welding machine and synchronously rotates along with the main shaft (5) of the welding machine.
3. The temperature monitoring device for the friction stir welding seam core area according to claim 1, wherein the signal processing circuit board (8) is fixed on the taper sleeve (6) and is powered by a battery module (7) fixed inside the taper sleeve (6).
4. A temperature monitoring device for friction stir welding weld core according to claim 1, characterized in that the signal processing circuit board (8) comprises:
the power supply system comprises an amplifier, a signal processing module, a control module and a wireless transmitting module which are sequentially connected in series, and provides power through a power supply module;
the thermoelectric voltage E signal is amplified by an amplifier, then converted into a corresponding digital signal by a signal processing module, and the digital signal is noise-removed and filtered by a control module and then transmitted by a wireless transmitting module.
5. The temperature monitoring device for a friction stir welding weld core zone of claim 1, wherein: the thermocouple metal wire (1) is made of nickel-silicon alloy; the stirring head (3) is made of H13 die steel; alumina is used to insulate the ceramic.
6. A method for monitoring the temperature of a friction stir welding seam core region, which is characterized in that the method is implemented by using the device for monitoring the temperature of the friction stir welding seam core region according to any one of claims 1 to 5, and the method comprises the following steps:
step S101, machining a stepped hole on a stirring head (3) according to the position of a temperature measurement point of a friction surface of a workpiece to be measured; the small hole section of the stepped hole is close to the temperature detection point;
step S102, a thermocouple wire (1) is selected to be placed in a stepped hole of a stirring head (3), the exposed end at the bottom of the thermocouple wire (1) is tightly contacted with the stirring head (3) at a temperature measuring point, the exposed end at the upper part of the thermocouple wire (1) is connected with a column part of the stirring head through a wire to form a conductive loop, and a signal processing circuit board (8) is connected in the conductive loop; a temperature-resistant insulating material is filled between the rest part of the thermocouple wire (1) and the stirring head (3); the thermocouple metal wire (1) and the stirring head (3) are made of different materials;
step S103, fixing the stirring head (3) in a jacket, connecting the jacket with a taper sleeve, and mounting the taper sleeve on a main shaft of the welding machine; in the process of welding the workpiece (4) by using the stirring head (3), the exposed end at the bottom of the thermocouple wire (1) is flush with the stirring head (3) and is simultaneously contacted with the workpiece (4);
step S104, in the welding process, a thermoelectric voltage difference E between the thermocouple wire (1) and the stirring head (3) is collected through the signal processing circuit board (8) and used as a temperature monitoring signal; the signal processing circuit board (8) is fixed on the taper sleeve, a battery module is arranged in the taper sleeve to supply power to the circuit, and the temperature signal wire and the power wire are connected with the circuit board through a jacket and an inner hole of the taper sleeve;
step S105, the detected thermal potential difference E is transmitted to an external upper computer for data storage and presentation by using a signal processing circuit board (8) through an amplifying circuit and a wireless transmission module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310185422.XA CN116329731A (en) | 2023-03-01 | 2023-03-01 | Temperature monitoring method and device for friction stir welding weld joint core area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310185422.XA CN116329731A (en) | 2023-03-01 | 2023-03-01 | Temperature monitoring method and device for friction stir welding weld joint core area |
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| CN116329731A true CN116329731A (en) | 2023-06-27 |
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| CN202310185422.XA Pending CN116329731A (en) | 2023-03-01 | 2023-03-01 | Temperature monitoring method and device for friction stir welding weld joint core area |
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| CN (1) | CN116329731A (en) |
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2023
- 2023-03-01 CN CN202310185422.XA patent/CN116329731A/en active Pending
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