CN118162795A - Method for prolonging service life of cross lap welding type small-inertia thermocouple wire - Google Patents
Method for prolonging service life of cross lap welding type small-inertia thermocouple wire Download PDFInfo
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- CN118162795A CN118162795A CN202410287121.2A CN202410287121A CN118162795A CN 118162795 A CN118162795 A CN 118162795A CN 202410287121 A CN202410287121 A CN 202410287121A CN 118162795 A CN118162795 A CN 118162795A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005493 welding type Methods 0.000 title claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 88
- 239000003223 protective agent Substances 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 239000012459 cleaning agent Substances 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 4
- 244000137852 Petrea volubilis Species 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000000834 fixative Substances 0.000 claims 1
- 230000001737 promoting effect Effects 0.000 claims 1
- 239000004945 silicone rubber Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 11
- 239000000523 sample Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The application provides a method for prolonging the service life of a cross lap welding type small inertia thermocouple wire, belonging to the technical field of thermocouples, comprising the following steps: cleaning the welding surface of the first diameter galvanic couple wire by using a cleaning agent before a welding machine, and polishing by using fine sand paper to remove an oxide layer at a welding position; welding the end surfaces of the two first diameter galvanic wires to form a bent galvanic wire with a preset angle; welding the second diameter galvanic wire and the first diameter galvanic wire to form a cross lap welding galvanic wire, wherein a second welding spot is formed at the welding position of the second diameter galvanic wire and the first diameter galvanic wire; uniformly coating a connection-assisting protective agent at the second welding point, wherein the connection-assisting protective agent covers the whole second welding point, and polyacrylate resin materials are uniformly coated at the root parts of the first diameter galvanic filaments and the second diameter galvanic filaments adjacent to the second welding point; and injecting an insulating fixing agent into the mounting seat of the thermocouple, inserting the cross lap welding type thermocouple wire into the mounting seat, and enabling the second diameter thermocouple wire to be higher than the end face of the mounting seat 5 by a preset length.
Description
Technical Field
The application belongs to the field of thermocouples, and particularly relates to a method for prolonging the service life of a cross lap welding type small-inertia thermocouple wire.
Background
The thermocouple for testing the inlet temperature distortion of the aeroengine has quick time response so as to meet the requirement of testing the dynamic temperature distortion parameter. The thermocouple has smaller thermal inertia for testing the temperature rise rate response of 2000K/s. The thermocouple wires of the common thermocouple are bare thermocouple wires with diameters within 0.1mm and are fixed on the temperature probe in a cross lap welding mode. The filament thermocouple temperature probe is the most ideal structure with the current response time, but because the thermocouple wires are in a cross lap welding structure, the reliability of the thermocouple temperature probe is greatly reduced when the test air flow reaches 0.5-0.6 Ma.
Therefore, on the basis of not changing the thermal overall structure of the cross lap welding small inertia filament, the service life of the cross lap welding small inertia thermocouple filament under the aeroengine inlet test condition is greatly prolonged, the repairing cost is reduced, and the test efficiency is improved by improving the welding and manufacturing process.
Disclosure of Invention
The application aims to provide a method for prolonging the service life of a cross lap welding type small inertia thermocouple wire, so as to solve or alleviate at least one problem in the background technology.
The technical scheme of the application is as follows: a method of improving the service life of a cross lap welded small inertia thermocouple wire, the method comprising:
selecting a K-shaped first diameter thermocouple wire as a thermocouple wire for measuring the cross section of the thermocouple end, cleaning the welding surface of the first diameter thermocouple wire by using a cleaning agent before a welding machine, and polishing by using fine sand paper to remove an oxide layer at the welding position;
Welding the end surfaces of the two first diameter galvanic wires to form a bent galvanic wire with a preset angle, wherein the welding parts of the end surfaces of the two first diameter galvanic wires form first welding spots;
welding the second diameter galvanic wire and the first diameter galvanic wire to form a cross lap welding galvanic wire, wherein a second welding spot is formed at the welding position of the second diameter galvanic wire and the first diameter galvanic wire;
Uniformly coating a connection-assisting protective agent at the second welding point, wherein the connection-assisting protective agent covers the whole second welding point, and uniformly coating the connection-assisting protective agent at the root parts of the first diameter galvanic wire and the second diameter galvanic wire which are adjacent to the second welding point, wherein the total coated length is not less than one third of the total length of the first diameter galvanic wire and the second diameter galvanic wire respectively;
And injecting an insulating fixing agent into the mounting seat of the thermocouple, inserting the cross lap welding type thermocouple wire into the mounting seat, and enabling the second diameter thermocouple wire to be higher than the end face of the mounting seat 5 by a preset length.
Further, the cleaning agent is ethanol.
Further, the predetermined angle is greater than 130 °.
Further, the auxiliary connection protective agent is polyacrylate resin.
Further, the insulating fixing agent is 704 silicon rubber.
Further, the predetermined length is 2mm to 3mm.
Further, the diameter of the first diameter galvanic wire is smaller than that of the second diameter galvanic wire.
Further, the diameter of the first diameter thermocouple wire is 0.08mm, and the diameter of the second diameter thermocouple wire is 0.5mm.
Further, welding parameters when welding the first diameter galvanic couple wire are as follows: the welding energy is 14 joules, the welding time is 30ms, the welding spot is welded at one time, and the repeated welding is not realized;
The welding parameters when the first diameter thermocouple wire and the second diameter thermocouple wire are welded are as follows: the welding energy is 15 joules, the welding time is 35ms, and the welding spot is welded once and can not be repeatedly welded.
In addition, the application also provides a cross lap welding type thermocouple, which is prepared by adopting the method for prolonging the service life of the cross lap welding type small inertia thermocouple wire.
The method can greatly improve the service life of the cross lap welding type small inertia couple wire under the aeroengine inlet test condition on the basis of not changing the cross lap welding small inertia filament heat overall structure, can greatly reduce the repairing cost and improve the test efficiency.
Drawings
In order to more clearly illustrate the technical solution provided by the present application, the following description will briefly refer to the accompanying drawings. It will be apparent that the figures described below are merely some embodiments of the application.
FIG. 1 is a schematic view of a thermocouple tip of the present application.
Reference numerals:
1-first diameter galvanic wire
2-First solder joint
3-Second diameter galvanic wire
4-Second solder joint
5-Mounting base
Detailed Description
In order to make the objects, technical solutions and advantages of the present application become more apparent, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.
In order to greatly improve the service life of the cross lap welded type small inertia filament thermocouple under the aeroengine inlet test condition, the application provides a method for improving the service life of the cross lap welded type small inertia thermocouple.
As shown in FIG. 1, the method for improving the service life of the cross lap welded type small inertia thermocouple wire provided by the application comprises the following steps:
Step S1, selecting a K-shaped first diameter thermocouple wire 1 as a thermocouple wire for measuring the cross section of a thermocouple end (namely, perpendicular to the airflow direction), cleaning the welding surface of the first diameter thermocouple wire 1 by using a cleaning agent (ethanol) before welding, and polishing by using fine sand paper to remove an oxide layer at a welding position, wherein the welding surface is usually the end surface of the first diameter thermocouple wire 1;
Step S2, welding the end surfaces of the two first-diameter galvanic wires 1 by using a capacitive spot welder to form a bent galvanic wire with a preset angle, wherein a first welding spot 2 is formed at the welding position of the end surfaces of the two first-diameter galvanic wires 1;
Wherein, the included angle formed by the two first diameter galvanic wires 1 after welding is larger than 130 degrees (the drum is in the coming direction), and the two first diameter galvanic wires 1 after welding should not have folds;
s3, welding the second diameter thermocouple wire 3 and the first diameter thermocouple wire 1 by using a capacitance type spot welder to form a cross lap welding type thermocouple wire, wherein a second welding point 4 is formed at the welding position of the second diameter thermocouple wire 3 and the first diameter thermocouple wire 1;
S4, uniformly coating a connection-assisting protective agent (polyacrylate resin) at the second welding point 4, wherein the connection-assisting protective agent covers the whole second welding point 4, and uniformly coating a connection-assisting protective agent at the root parts of the first diameter galvanic wire 1 and the second diameter galvanic wire 3 which are adjacent to the second welding point 4, wherein the total length of coating is not less than one third of the total length of the first diameter galvanic wire 1 and the second diameter galvanic wire 3 respectively;
S5, injecting an insulating fixing agent (704 silicon rubber materials) into the mounting seat 5, inserting the cross lap welding type thermocouple wires into the mounting seat 5, and enabling the second diameter thermocouple wires 3 to be 2-3 mm higher than the end face of the mounting seat 5.
In the present application, the diameter of the first diameter galvanic wire 1 is smaller than the diameter of the second diameter galvanic wire, for example, in one embodiment of the present application, the diameter of the first diameter galvanic wire 1 is 0.08mm, and the diameter of the second diameter galvanic wire 3 is 0.5mm.
In a preferred embodiment of the present application, when welding the first diameter galvanic wire 1, the welding parameters used by the capacitive spot welder are: the welding energy is 14 joules, the welding time is 30ms, the welding spot is welded at one time, and the repeated welding is not realized; when the first diameter thermocouple wire 1 and the second diameter thermocouple wire 3 are welded, the welding parameters used by the capacitive spot welder are as follows: the welding energy is 15 joules, the welding time is 35ms, and the welding spot is welded once and can not be repeatedly welded.
In addition, the application also provides a cross lap welding type thermocouple, which is manufactured by adopting the process method.
The method can greatly improve the service life of the cross lap welding type small inertia couple wire under the aeroengine inlet test condition on the basis of not changing the cross lap welding small inertia filament heat overall structure, can greatly reduce the repairing cost and improve the test efficiency.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of increasing the service life of a cross lap welded small inertia thermocouple wire, the method comprising:
selecting a K-shaped first diameter thermocouple wire (1) as a thermocouple wire for measuring the cross section of a thermocouple end, cleaning the welding surface of the first diameter thermocouple wire (1) by using a cleaning agent before a welding machine, and polishing by using fine sand paper to remove an oxide layer at a welding position;
welding the end surfaces of the two first diameter galvanic wires (1) to form a bent galvanic wire with a preset angle, wherein a first welding point (2) is formed at the welding position of the end surfaces of the two first diameter galvanic wires (1);
welding the second diameter thermocouple wire (3) and the first diameter thermocouple wire (1) to form a cross lap welding type thermocouple wire, and forming a second welding point (4) at the welding position of the second diameter thermocouple wire (3) and the first diameter thermocouple wire (1);
Uniformly coating a connection-assisting protective agent at the second welding point (4), wherein the connection-assisting protective agent covers the whole second welding point (4), and simultaneously uniformly coating the connection-assisting protective agent at the root parts of the first diameter thermocouple wire (1) and the second diameter thermocouple wire (3) which are adjacent to the second welding point (4), wherein the total length of coating is not less than one third of the total length of the first diameter thermocouple wire (1) and the second diameter thermocouple wire (3) respectively;
And (3) injecting an insulating fixing agent into the mounting seat (5) of the thermocouple, inserting the cross lap welding type thermocouple wire into the mounting seat (5), and enabling the second diameter thermocouple wire (3) to be higher than the end face of the mounting seat 5 by a preset length.
2. The method of increasing the service life of a cross-lap welded low inertia thermocouple wire of claim 1, wherein the cleaning agent is ethanol.
3. The method of increasing the service life of a cross-lap welded low inertia thermocouple wire of claim 1, wherein said predetermined angle is greater than 130 °.
4. The method for improving the service life of a cross lap welded small inertia thermocouple wire of claim 1, wherein the adhesion promoting protective agent is a polyacrylate resin.
5. The method of increasing the service life of a cross lap welded low inertia thermocouple wire of claim 1, wherein said insulating fixative is 704 silicone rubber.
6. The method of increasing the service life of a cross lap welded low inertia thermocouple wire of claim 1, wherein the predetermined length is between 2mm and 3mm.
7. Method for improving the service life of cross lap welded small inertia thermocouple wires according to claims 1 to 6, characterized in that the diameter of the first diameter thermocouple wire (1) is smaller than the diameter of the second diameter thermocouple wire (3).
8. The method for improving the service life of a cross lap welded small inertia thermocouple wire according to claim 7, wherein the diameter of the first diameter thermocouple wire (1) is 0.08mm and the diameter of the second diameter thermocouple wire (3) is 0.5mm.
9. The method for improving the service life of a cross lap welded small inertia thermocouple wire according to claim 8, wherein the welding parameters when welding the first diameter thermocouple wire (1) are: the welding energy is 14 joules, the welding time is 30ms, the welding spot is welded at one time, and the repeated welding is not realized;
The welding parameters when the first diameter thermocouple wire (1) and the second diameter thermocouple wire (3) are welded are as follows: the welding energy is 15 joules, the welding time is 35ms, and the welding spot is welded once and can not be repeatedly welded.
10. A cross lap welded thermocouple produced by the method of any one of claims 1 to 9 for increasing the useful life of cross lap welded low inertia thermocouple wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410287121.2A CN118162795A (en) | 2024-03-13 | 2024-03-13 | Method for prolonging service life of cross lap welding type small-inertia thermocouple wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410287121.2A CN118162795A (en) | 2024-03-13 | 2024-03-13 | Method for prolonging service life of cross lap welding type small-inertia thermocouple wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118162795A true CN118162795A (en) | 2024-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410287121.2A Pending CN118162795A (en) | 2024-03-13 | 2024-03-13 | Method for prolonging service life of cross lap welding type small-inertia thermocouple wire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118162795A (en) |
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- 2024-03-13 CN CN202410287121.2A patent/CN118162795A/en active Pending
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