CN116275763B - Hot wire welding method and device for one-dimensional probe of hot wire anemometer - Google Patents
Hot wire welding method and device for one-dimensional probe of hot wire anemometer Download PDFInfo
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- CN116275763B CN116275763B CN202310574219.1A CN202310574219A CN116275763B CN 116275763 B CN116275763 B CN 116275763B CN 202310574219 A CN202310574219 A CN 202310574219A CN 116275763 B CN116275763 B CN 116275763B
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- 238000003466 welding Methods 0.000 title claims abstract description 172
- 239000000523 sample Substances 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229910052802 copper Inorganic materials 0.000 claims abstract description 72
- 239000010949 copper Substances 0.000 claims abstract description 72
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention relates to the technical field of hot wire anemometers, and discloses a hot wire welding method and device for a one-dimensional probe of a hot wire anemometer, wherein the probe position of the hot wire anemometer is adjusted through a first movable support, so that a hot wire is contacted with a round plane center point at the front end of a probe to be welded; the welding end of the welding copper bar is regulated through the second movable support, so that the contact point of the welding end of the welding copper bar and the hot wire is opposite to the center point of the circular plane, and the contact force of the welding copper bar and the hot wire is controlled to be 0.02N-0.05N; the welding sequence is that after the welding spots are applied to the center of the circular plane, one or two welding spots are symmetrically applied to the two sides of the center welding spot respectively by moving the second movable support, so that the welding strength is ensured, and meanwhile, the one-dimensional hot wire welding efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of hot wire anemometers, and discloses a hot wire welding method and device for a one-dimensional probe of a hot wire anemometer.
Background
The fields of aeroengines, gas turbines, aircrafts, wind tunnels and the like all need to measure parameters such as airflow direction, speed, turbulence and the like, and the current means for finely measuring airflow fields mainly comprise: hot wire anemometer, laser doppler velocimeter, and particle imaging velocimeter. Compared with other two test instruments, the hot wire anemometer has the characteristics of convenient use, analog voltage output, quick response and wide measurement range. In addition, the hot wire anemometer is also much cheaper than the other two measurement means.
However, since the hot wire anemometer probe is directly arranged in the flow field, and the diameter of the hot wire is only a few micrometers (generally 5-10 micrometers), the hot wire anemometer probe is easily damaged due to impurities in the flow field, equipment vibration and the like, and a method for rapidly welding and repairing the hot wire anemometer probe is needed, so that the repairing efficiency of the hot wire anemometer is improved.
Disclosure of Invention
The invention aims to provide a hot wire welding method and device for a one-dimensional probe of a hot wire anemometer, wherein the contact force between a welding copper bar and a hot wire is controlled to be 0.02N-0.05N; after the welding spots are applied to the center of the circular plane, one or two welding spots are symmetrically applied to two sides of the center welding spot respectively by moving the second movable support, the structure of the welding end part, the pressure required by welding and the welding spot sequence are adjusted, the welding strength is ensured, and meanwhile, the one-dimensional hot wire welding efficiency is greatly improved.
In order to achieve the technical effects, the technical scheme adopted by the invention is as follows:
a hot wire welding method of a one-dimensional probe of a hot wire anemometer comprises the following steps:
fixing a probe of the hot wire anemometer on a first movable support, wherein the probe of the hot wire anemometer comprises two cantilever probes, and the first movable support is used for adjusting the vertical height and the horizontal position of the front end of the probe of the hot wire anemometer;
the welding copper bar is arranged on a second movable support, and the second movable support is used for adjusting the vertical height and the horizontal position of the welding copper bar;
fixing the hot wire at the ends of the two support rods of the U-shaped clamp, and keeping the hot wire in a straightening state;
when the front end of each probe is welded with the same hot wire, the first movable support is adjusted to enable the hot wire to be in contact with the center point of the round plane corresponding to the front end of the probe;
adjusting the second movable support to enable the welding copper bar to be in contact with the hot wire, wherein the contact point is the hot wire position corresponding to the center point of the front end of the probe of the hot wire anemometer, and the contact force between the copper bar and the hot wire is 0.02N-0.05N;
respectively connecting the tail end of the probe and a welding copper rod into electrodes of a welding machine to enable a hot wire to be welded at the center point of the front end of the probe, wherein the output voltage of the welding machine is 10+/-0.5V;
and symmetrically applying one or two welding spots on two sides of the central point of the front end of the probe, wherein all the welding spots are distributed at equal intervals.
Further, when the hot wires are welded between the two probes of the hot wire anemometer, welding forming is carried out in a mode that welding spots are alternately applied to the front ends of the two probes.
Further, a first camera is adopted to collect a top view of the front end center point of the probe, a second camera is adopted to collect a horizontal lateral view of the front end center point of the probe, and according to the three-dimensional positions of the front end of the probe, the hot wire and the welding copper rod end in the view, the first movable support and the second movable support are respectively adjusted to enable the front end center point of the probe, the welding copper rod center point to correspond to the welding spot.
Further, the welding end of the welding copper bar is in a round table structure, and the end part of the welding copper bar is a round surface; wherein the angle range of the conical tip of the welding copper rod is 20-30 degrees, and the diameter of the circular surface is 5-10 micrometers.
Further, a jack for inserting a welding copper bar is arranged on the second movable support, and an internal thread is arranged in the jack; the welding copper bar outer wall is fixed with an adjusting cylinder, and the adjusting cylinder outer wall is provided with external threads matched with the internal threads.
In order to achieve the technical effects, the invention also provides a hot wire welding device for the one-dimensional probe of the hot wire anemometer, which is used for implementing the hot wire welding method for the one-dimensional probe of the hot wire anemometer, and comprises the following steps:
the probe of the hot wire anemometer is arranged on the first movable support, and the first movable support is used for adjusting the vertical height and the horizontal position of the front end of the probe of the hot wire anemometer;
the second movable support is used for adjusting the vertical height and the horizontal position of the welding copper rod;
the U-shaped clamp is used for fixing the welding hot wire;
and the welding machine is used for providing current for the probes and the welding copper bars and finishing welding forming of the hot wires at the front end of each probe.
Further, a first camera is arranged right above the front end of the probe, and a second camera is arranged horizontally at the side of the front end of the probe.
Compared with the prior art, the invention has the following beneficial effects: the contact force between the welding copper bar and the hot wire is controlled to be 0.02N-0.05N; after the welding spots are applied to the center of the circular plane, one or two welding spots are symmetrically applied to the two sides of the center welding spot respectively by moving the second movable support, the structure of the welding end part, the pressure required by welding and the welding spot sequence are adjusted, the welding strength is ensured, and meanwhile, the one-dimensional hot wire welding efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a hot wire welding device for a one-dimensional probe of a hot wire anemometer in an embodiment;
FIG. 2 is a schematic diagram of the positional relationship among the hot wire, the U-shaped fixture, the first camera, and the second camera in the embodiment;
1, a probe; 2. a first movable support; 3. a probe; 4. welding a copper bar; 5. the second movable support; 6. a hot wire; 7. a U-shaped clamp; 8. welding machine; 9. a first camera; 10. a second camera; 11. and (5) adjusting the cylinder.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Examples
Referring to fig. 1 and 2, a hot wire anemometer one-dimensional probe hot wire welding method includes:
fixing a probe 1 of the hot wire anemometer on a first movable support 2, wherein the probe 1 of the hot wire anemometer comprises two cantilever probes 3, and the first movable support 2 is used for adjusting the vertical height and the horizontal position of the front end of the probe 3 of the hot wire anemometer;
the welding copper rod 4 is arranged on a second movable support 5, and the second movable support 5 is used for adjusting the vertical height and the horizontal position of the welding copper rod 4;
fixing the hot wire 6 at the ends of two support rods of the U-shaped clamp 7, and keeping the hot wire 6 in a straightening state;
when the front end of each probe 3 is welded with the same hot wire 6, the first movable support 2 is adjusted to enable the hot wire 6 to be in contact with the center point of the round plane corresponding to the front end of the probe 3;
the second movable support 5 is regulated to enable the welding copper rod 4 to be in contact with the hot wire 6, the contact point is the position of the hot wire 6 corresponding to the center point of the front end of the probe 3 of the hot wire anemometer, and the contact force between the copper rod and the hot wire 6 is 0.02N-0.05N;
the tail end of the probe 3 and the welding copper rod 4 are respectively connected with electrodes of a welding machine 8, so that a hot wire 6 is welded at the center point of the front end of the probe 3, wherein the output voltage of the welding machine 8 is 10+/-0.5V;
one or two welding spots are symmetrically applied to two sides of the center point of the front end of the probe 3, and all the welding spots are distributed at equal intervals.
After the hot wire 6 between the two probes 3 of the hot wire anemometer breaks, the front end of the probe 3 is ensured to be a circular plane before the hot wire 6 is welded. The conventional treatment is to polish the probe end into a conical shape in advance and then polish the conical tip into a circular plane. In the embodiment, the hot wire 6 can be straightened and fixed between the two support rod ends of the U-shaped clamp 7 through adhesive tape or glue; when the hot wire 6 is welded, the first movable support 2 is adjusted to enable the hot wire 6 to be located at the center of a round plane at the front end of the hot wire anemometer probe 3, and the round plane is slightly contacted with the left side of the hot wire 6. And adjusting the welding copper rod 4 on the second fixed support, so that one end part of the welding copper rod 4 is contacted with the hot wire 6 on the circular platform at the front end of the probe 3 to be welded, and the contact point of the welding copper rod 4 and the hot wire 6 is ensured to be also on the central axis of the circular plane, and the hot wire 6 is welded to the central point of the circular platform at the front end of the probe 3 to be welded by controlling the contact force of the welding copper rod 4 and the hot wire 6 to be 0.02N-0.05N and clicking on and off a welder 8. After the application of the center welding spots is completed, one or two welding spots are symmetrically applied to the two sides of the center point of the front end of the probe 3 to be welded, and all the welding spots are distributed at equal intervals. In the embodiment, the position of the probe 1 of the hot wire anemometer is adjusted through the first movable support 2, so that the hot wire 6 is contacted with the center point of the circular plane at the front end of the probe 3 to be welded; the welding end of the welding copper bar 4 is regulated through the second movable support 5, so that the contact point of the welding end of the welding copper bar 4 and the hot wire 6 is opposite to the center point of the circular plane, and the contact force of the welding copper bar 4 and the hot wire 6 is controlled to be 0.02N-0.05N; the welding sequence is that after the welding spots are applied to the center of the circular plane, one or two welding spots are symmetrically applied to the two sides of the center welding spot respectively by moving the second movable support 5, so that the welding strength is ensured, and meanwhile, the one-dimensional hot wire welding efficiency is greatly improved.
After the welding spots of the two probes 3 are applied, the switch of the click welder 8 is turned on, and the part of the hot wire 6 extending outside the two probes 3 is fused. The resistance value of the front end of the hot wire anemometer probe 3 can be detected by using an instrument, if the resistance value is qualified for welding repair within a specified range, the welding repair is needed again otherwise.
In this embodiment, when the hot wire 6 is welded between the two probes 3 of the hot wire anemometer, welding forming is performed by alternately applying welding spots to the front ends of the two probes 3. The mode of alternately welding the two probes 3 can enable the probes 3 after welding spots are applied to have a certain cooling time on one hand, and the problem that the welding effect of the hot wire 6 on a circular plane is affected due to the fact that the temperature of the probes 3 is too high when the welding spots are continuously applied to the same probe 3 is avoided.
The first camera 9 is adopted to collect a top view of the front end center point of the probe 3, the second camera 10 is adopted to collect a horizontal lateral view of the front end center point of the probe 3, and the first movable support 2 and the second movable support 5 are respectively adjusted according to the three-dimensional positions of the front end of the probe 3, the hot wire 6 and the end of the welding copper rod 4 in the views, so that the front end center point of the probe 3 and the center point of the welding copper rod 4 correspond to the welding spot positions. Before welding, the position and focal length of the first camera 9 can be adjusted to enable the hot wire 6 to be clearly displayed in the center of the field of view of the first camera 9; the position and focal length of the second camera 10 in the horizontal side view (adjusted to the front of the circular plane side of the front end of the probe 3) are adjusted so that the hot wire 6 is in the center of the field of view of the second camera 10 and clearly displayed. Then, if the centers of the front ends of the two probes 3 of the probe 1 are not on the same horizontal line, the position of the probe 1 needs to be adjusted by the first movable support 2 until the centers of the front ends of the two probes 3 of the probe 1 are on the same horizontal line, as observed by the second camera 10. The first camera 9 is adjusted such that the probe 1 to be welded is in the center of the camera. And then the first movable support 2 is horizontally adjusted to enable the front end of the probe 3 to be welded to be in contact with the hot wire 6, and the second movable support 5 is adjusted to enable the welding end of the welding copper rod 4 to be aligned with the end of the probe 3 to be welded to be in contact with the hot wire 6, so that the welding machine 8 can be controlled to weld. In the embodiment, the alignment of the center of the front end of the probe 3 to be welded, the hot wire 6 and the front end of the welding copper rod 4 in the horizontal direction is ensured through the view field observation of the first camera 9; the alignment of the center of the front end of the probe 3 to be soldered, the hot wire 6 and the front end of the soldering copper rod 4 in the vertical direction is ensured by the view field observation of the second camera 10. The double-view-field alignment is realized, and the defect that the horizontal and vertical directions cannot be easily and accurately aligned at the same time cannot be ensured by a single view field is avoided.
The welding end of the welding copper rod 4 in the embodiment is in a round table structure, and the end part is a round surface; wherein the angle range of the conical tip of the welding copper rod 4 is 20-30 degrees, and the diameter of the circular surface is 5-10 micrometers. The end heads of the copper bars 4 welded by the probes 3 are polished into conical shapes and then the tips are processed into round surfaces, so that whether the copper bars are aligned or not can be observed from a visual field. And in order to further ensure the field of view of the camera, the angle range of the conical tip of the welding copper rod 4 is required to be 20-30 degrees. The conical tip of the welding copper rod 4 and the probe 3 are contacted with two symmetrical points in the horizontal direction of the hot wire 6, the conical tip of the welding copper rod 4 and the conical tip of the probe 3 are polished into a circular plane, the diameter of the circular plane at the front end of the probe 3 is ensured to be within the range of 20-50 microns, the hot wire 6 with the welding point number of 5-10 microns is ensured to be not less than three on the circular plane, welding spots on the probe 3 can be symmetrically distributed on two sides of a central welding spot, the welding spot symmetrical distribution not only improves the heat dissipation effect of the welding spots, reduces the thermal stress and the welding deformation, but also can ensure that the hot wire is uniformly stressed between the two welding spots which are not shed under the condition that the individual welding spots are in the process of virtual welding or the individual welding spots are shed in the use, and the service life is prolonged. The plane diameter of the end part of the welding copper rod 4 is in the range of 5-10 microns, so that the diameter of the hot wire 6 can be covered, and the welding copper rod can be reliably contacted and discharged.
The second movable support 5 is provided with a jack for inserting the welding copper rod 4, and an internal thread is arranged in the jack; the outer wall of the welding copper bar 4 is fixedly provided with an adjusting cylinder 11, and the outer wall of the adjusting cylinder 11 is provided with external threads matched with the internal threads. The second movable support 5 is used for carrying out position adjustment on the welding copper rod 4 so that the welding copper rod 4 contacts with the hot wire 6, and then the position of the second movable support 5 is locked; and then the welding copper bar 4 can be rotated by a torque wrench to control the contact force between the welding copper bar 4 and the hot wire 6 within a required range.
Based on the same inventive concept, the hot wire welding method of the one-dimensional probe of the hot wire anemometer of the embodiment is based on a hot wire welding device of the one-dimensional probe of the hot wire anemometer, and the device comprises:
the first movable support 2 is provided with a probe 1 of the hot wire anemometer, and the first movable support 2 is used for adjusting the vertical height and the horizontal position of the front end of the hot wire anemometer probe 3;
the second movable support 5 is provided with a welding copper bar 4, and the second movable support 5 is used for adjusting the vertical height and the horizontal position of the welding copper bar 4;
the U-shaped clamp 7 is used for fixing the welding hot wire 6;
and the welding machine 8 is used for providing current for the probes 3 and the welding copper bars 4 and finishing welding forming of the hot wires 6 at the front end of each probe 3.
The first camera 9 is arranged right above the front end of the probe 3 in the embodiment, and the second camera 10 is arranged horizontally at the side of the front end of the probe 3. The alignment of the center of the front end of the probe 3 to be welded, the hot wire 6 and the front end of the welding copper rod 4 in the horizontal direction is ensured through the view field observation of the first camera 9; the alignment of the center of the front end of the probe 3 to be soldered, the hot wire 6 and the front end of the soldering copper rod 4 in the vertical direction is ensured by the view field observation of the second camera 10. The double-view-field alignment is realized, and the defect that the horizontal and vertical directions cannot be easily and accurately aligned at the same time cannot be ensured by a single view field is avoided.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The hot wire welding method for the one-dimensional probe of the hot wire anemometer is characterized by comprising the following steps of:
fixing a probe (1) of a hot wire anemometer on a first movable support (2), wherein the probe (1) of the hot wire anemometer comprises two cantilever probes (3), and the first movable support (2) is used for adjusting the vertical height and the horizontal position of the front end of the probe (3) of the hot wire anemometer;
the welding copper rod (4) is arranged on a second movable support (5), and the second movable support (5) is used for adjusting the vertical height and the horizontal position of the welding copper rod (4); the welding end of the welding copper rod (4) is of a round platform structure, and the end part of the welding copper rod is of a round surface; wherein the angle range of the conical tip of the welding copper bar (4) is 20-30 degrees, and the diameter of the circular surface is 5-10 micrometers;
fixing the hot wire (6) at the ends of two support rods of the U-shaped clamp (7), and keeping the hot wire (6) in a straightening state;
when the front end of each probe (3) is welded with the same hot wire (6), the first movable support (2) is adjusted to enable the hot wire (6) to be in contact with the center point of the round plane at the front end of the corresponding probe (3);
the second movable support (5) is regulated to enable the welding copper bar (4) to be in contact with the hot wire (6), the contact point is the position of the hot wire (6) corresponding to the center point of the front end of the probe (3) of the hot wire anemometer, and the contact force between the copper bar and the hot wire (6) is 0.02N-0.05N;
the tail end of the probe (3) and the welding copper rod (4) are respectively connected with the electrode of the welding machine (8), so that the hot wire (6) is welded at the center point of the front end of the probe (3), wherein the output voltage of the welding machine (8) is 10+/-0.5V;
symmetrically applying one or two welding spots on two sides of the central point of the front end of the probe (3), wherein all the welding spots are distributed at equal intervals; when a hot wire (6) is welded between two probes (3) of the hot wire anemometer, welding forming is carried out in a mode that welding spots are alternately applied to the front ends of the two probes (3);
and when in welding, a first camera (9) is adopted to collect a top view of the front end center point of the probe (3), a second camera (10) is adopted to collect a horizontal lateral view of the front end center point of the probe (3), and the first movable support (2) and the second movable support (5) are respectively adjusted according to the three-dimensional positions of the front end of the probe (3), the hot wire (6) and the end of the welding copper rod (4) in the views, so that the front end center point of the probe (3), the center point of the welding copper rod (4) and the welding spot position correspond.
2. The hot wire welding method of the one-dimensional probe of the hot wire anemometer according to claim 1, wherein a jack for inserting a welding copper bar (4) is arranged on the second movable support (5), and an internal thread is arranged in the jack; an adjusting cylinder (11) is fixed on the outer wall of the welding copper rod (4), and an external thread matched with the internal thread is arranged on the outer wall of the adjusting cylinder (11).
3. A hot wire welding device for a one-dimensional probe of a hot wire anemometer, for implementing the hot wire welding method for the one-dimensional probe of the hot wire anemometer according to claim 1 or 2, comprising:
the probe (1) of the hot wire anemometer is arranged on the first movable support (2), and the first movable support (2) is used for adjusting the vertical height and the horizontal position of the front end of the hot wire anemometer probe (3);
the second movable support (5) is provided with a welding copper bar (4), and the second movable support (5) is used for adjusting the vertical height and the horizontal position of the welding copper bar (4);
the U-shaped clamp (7), the U-shaped clamp (7) is used for fixing a welding hot wire (6);
and the welding machine (8) is used for providing current for the probes (3) and the welding copper bars (4) and finishing the welding forming of the hot wires (6) at the front end of each probe (3).
4. The hot wire welding device for the one-dimensional probe of the hot wire anemometer according to claim 3, wherein a first camera (9) is arranged right above the front end of the probe (3), and a second camera (10) is arranged horizontally at the side of the front end of the probe (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310574219.1A CN116275763B (en) | 2023-05-22 | 2023-05-22 | Hot wire welding method and device for one-dimensional probe of hot wire anemometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310574219.1A CN116275763B (en) | 2023-05-22 | 2023-05-22 | Hot wire welding method and device for one-dimensional probe of hot wire anemometer |
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| CN116275763A CN116275763A (en) | 2023-06-23 |
| CN116275763B true CN116275763B (en) | 2023-08-18 |
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