CN101088693A - Microbeam plasma arc scanning type weld seam tracking sensor - Google Patents
Microbeam plasma arc scanning type weld seam tracking sensor Download PDFInfo
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- CN101088693A CN101088693A CN 200710072531 CN200710072531A CN101088693A CN 101088693 A CN101088693 A CN 101088693A CN 200710072531 CN200710072531 CN 200710072531 CN 200710072531 A CN200710072531 A CN 200710072531A CN 101088693 A CN101088693 A CN 101088693A
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Abstract
The present invention relates to weld seam tracking sensor for welding process, and is especially a microbeam plasma arc scanning type weld seam tracking sensor. The weld seam tracking sensor includes a lower gun body with cavity separated into a middle cavity and an outer cavity, a compression nozzle with cavity separated into a middle cavity communicated with the middle cavity of the lower gun body and an outer cavity, an upper gun body with cavity communicated with the middle cavity of the lower gun body, a tungsten electrode with upper end outside the top of the upper gun body and lower end located inside the middle cavity of the compression nozzle and forming one slot together with the spout of the compression nozzle, an ionic gas duct with one end communicated with the upper gun body cavity, and cooling water inlet pipe and outlet pipe communicated with the outer cavity of the lower gun body.
Description
Technical field
The present invention relates to a kind of sensor, be specifically related to the weld seam tracking sensor in a kind of welding process.
Background technology
Realize welding process by manual in automatic transforming process, various soldered sensors play critical effect.Because the effect of various factors, actual welding condition often changes, the for example processing and the error of fit on and the heat in the welding process and residual stress and the situations such as distortion that produce can cause the variation of joint location and size, therefore require welding system (or arc welding robot) can detect this variation and adjustment path of welding and welding parameter in real time, to guarantee welding quality.The most important condition that obtains qualified weld seam is to guarantee aiming at of welding gun and weld seam, so in various soldered sensors, weld seam tracking sensor has occupied very large proportion, accounts for 80% of soldered sensor total amount.The sensor that is used for Arc Welding Process Control has a variety of, arc sensor and optical pickocff occupy outstanding status, but two kinds of sensor ubiquity ranges of application are narrow, the authenticity of the interference that is subject to electric arc, Information Monitoring and accuracy is lower, problem that the welding material surface is had relatively high expectations.
The one piece of experiment that is called the paper article on plasma arc weld spotting scaming of " based on the weld joint tracking of micro-beam plasma arc " that is published on 2004 4 monthly magazines of welding journal is analyzed, compare the plasma arc sensor with traditional sensors and have the influence that welding process is independent, be not subjected to factors such as welding process, surface of the work reflection, but there is following shortcoming in the sensor in this experiment: the apparatus structure parameter does not have reasonably optimizing, the micro-beam plasma arc less stable of acquisition; Not with tungsten electrode and rifle body stationary device, the distance between tungsten electrode and the nozzle is fixing, measurement result repeated bad, and the data validity of collection is poor, need proofread parameter again before each measurement.
Summary of the invention
The present invention does not have reasonably optimizing for the apparatus structure parameter that solves existing micro-beam plasma arc sensor existence, the micro-beam plasma arc poor stability that obtains, distance between tungsten electrode and the nozzle is unfixing, measurement result repeated bad, the problem of the data validity difference of gathering provides a kind of microbeam plasma arc scanning type weld seam tracking sensor.The present invention comprises upper cutting gun 1, lower gun body 2, constricting nozzle 3 and tungsten electrode 4, upper cutting gun 1, lower gun body 2 and constricting nozzle 3 all are cavity structure, the inner chamber of lower gun body 2 is divided into rifle body lumen 2-1 and two cavitys of the external chamber 2-2 of rifle, the inner chamber of constricting nozzle 3 is divided into nozzle lumen 3-1 and two cavitys of nozzle exocoel 3-2, fixedly connected with the top of lower gun body 2 in the bottom of upper cutting gun 1, the inner chamber of upper cutting gun 1 is connected with the rifle body lumen 2-1 of lower gun body 2, fixedly connected with the top of constricting nozzle 3 in the bottom of lower gun body 2, the rifle body lumen 2-1 of lower gun body 2 is connected with the nozzle lumen 3-1 of constricting nozzle 3, the external chamber 2-2 of the rifle of lower gun body 2 is connected with the nozzle exocoel 3-2 of constricting nozzle 3, the top of upper cutting gun 1 is provided with tungsten electrode folder 5, tungsten electrode 4 is arranged on the tungsten electrode folder 5, the upper end of tungsten electrode 4 is positioned at the outside at upper cutting gun 1 top, the lower end of tungsten electrode 4 in the nozzle lumen 3-1 of constricting nozzle 3 and and the spout 6 of constricting nozzle 3 between form slit 13, the upper end of the lateral wall of upper cutting gun 1 is provided with ion airway 7, one end of ion airway 7 and the intracavity inter-connection of upper cutting gun 1, enter the upper end that cooling water pipe 9 is arranged on the lateral wall of lower gun body 2, go out the lower end that cooling water pipe 10 is arranged on the lateral wall of lower gun body 2, advance cooling water pipe 9 and be connected with the external chamber 2-2 of the rifle of lower gun body 2 respectively with an end that goes out cooling water pipe 10.
The invention effect: the apparatus structure parameter process reasonably optimizing of sensor of the present invention, the micro-beam plasma arc good stability of acquisition, the tungsten electrode folder makes the fixed distance between tungsten electrode and the nozzle, the good reproducibility of measurement result, the data validity height of collection; It is independent that the present invention has welding process with respect to traditional sensors, not influenced by welding process, is not subjected to arc light, splashes, the influence of factors such as heat radiation, surface reflection; Tracking accuracy of the present invention is higher, laterally reaches vertical accuracy of detection＜0.5mm, can be applicable to that butt joint, tower such as connect at the tracking sensing of multiple joint welding, can be used for most industrial welding production process.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention, the integrated circuit schematic diagram that the present invention when Fig. 2 is duty and external device (ED) connect.
The specific embodiment
The specific embodiment one: referring to Fig. 1, Fig. 2, present embodiment is by upper cutting gun 1, lower gun body 2, constricting nozzle 3 and tungsten electrode 4 are formed, upper cutting gun 1, lower gun body 2 and constricting nozzle 3 all are cavity structure, the inner chamber of lower gun body 2 is divided into rifle body lumen 2-1 and two cavitys of the external chamber 2-2 of rifle, the inner chamber of constricting nozzle 3 is divided into nozzle lumen 3-1 and two cavitys of nozzle exocoel 3-2, fixedly connected with the top of lower gun body 2 in the bottom of upper cutting gun 1, the inner chamber of upper cutting gun 1 is connected with the rifle body lumen 2-1 of lower gun body 2, fixedly connected with the top of constricting nozzle 3 in the bottom of lower gun body 2, the rifle body lumen 2-1 of lower gun body 2 is connected with the nozzle lumen 3-1 of constricting nozzle 3, the external chamber 2-2 of the rifle of lower gun body 2 is connected with the nozzle exocoel 3-2 of constricting nozzle 3, the top of upper cutting gun 1 is provided with tungsten electrode folder 5, tungsten electrode 4 is arranged on the tungsten electrode folder 5, the upper end of tungsten electrode 4 is positioned at the outside at upper cutting gun 1 top, the lower end of tungsten electrode 4 in the nozzle lumen 3-1 of constricting nozzle 3 and and the spout 6 of constricting nozzle 3 between form slit 13, the upper end of the lateral wall of upper cutting gun 1 is provided with ion airway 7, one end of ion airway 7 and the intracavity inter-connection of upper cutting gun 1, enter the upper end that cooling water pipe 9 is arranged on the lateral wall of lower gun body 2, go out the lower end that cooling water pipe 10 is arranged on the lateral wall of lower gun body 2, advance cooling water pipe 9 and be connected with the external chamber 2-2 of the rifle of lower gun body 2 respectively with an end that goes out cooling water pipe 10.The material of described upper cutting gun 1 is an insulating materials, and the material of described lower gun body 2 is a Heat Conduction Material, and the material of described constricting nozzle 3 is a conductive heat conducting material.The external diameter of the sensor of present embodiment is 15～20mm, and entire length is 80～150mm.
Operation principle: between constricting nozzle 3 and tungsten electrode 4, add a voltage, utilize the high frequency electric arc that ignites, the plasma air-flow of introducing by ion airway 7 (argon gas) again, plasma (orifice) gas stream enters the nozzle lumen 3-1 of constricting nozzle 3 by the rifle body lumen 2-1 of lower gun body 2, and be discharged to the outside of constricting nozzle 3 from the spout 6 of constricting nozzle 3, under the effect of plasma air-flow, part electric arc is blown to the outside of constricting nozzle 3, form plasma flame flow, this plasma flame flow belongs to high-temperature plasma, has good electrical conductivity.Increase along with the working time, the temperature of constricting nozzle 3 rises, cause conditions at the arc to change, influence scanning result, on lower gun body 2 water-cooling structure is installed, cooling water enters external chamber 2-2 of rifle and nozzle exocoel 3-2 by advancing cooling water pipe 9, flows out from going out cooling water pipe 10 then, water-cooling structure can make the temperature of constricting nozzle 3 tend towards stability, thereby obtains stable scanning result.Under the situation that parameters such as structure of nozzle, gas flow of ions amount, electric current are fixed, the electric conductivity of plasma depends on the length of this plasma, and promptly the equivalent resistance of plasma flame flow is directly proportional to the distance between the workpiece with constricting nozzle 3.As shown in Figure 2, between constricting nozzle 3 and tungsten electrode 4, arc maintenance power supply 14 is set, between constricting nozzle 3 and workpiece 18, be provided with again and measure power supply 15, and the resistance R of on circuit, connecting, the resistance R two ends are provided with a voltage acquisition card 16, and the voltage change at measuring resistance R two ends can draw the voltage change at equivalent resistance two ends, and notes data with computer 17, by can reflect the variation of the equivalent resistance of plasma flame flow, the i.e. variation of plasma flame flow length to the analysis of data.When the smooth position on the sensor scan workpiece 18, the distance between constricting nozzle 3 and the workpiece 18 remains unchanged, and the length of plasma flame flow is also constant, and the equivalent resistance of plasma flame flow is constant; When the weld seam of sensor scan to workpiece 18, the distance between constricting nozzle 3 and the workpiece 18 increases, and plasma flame flow length increases, and it is big that the equivalent resistance of plasma flame flow becomes, according to the position that calculates weld seam to resistance R both end voltage change information.Sensor of the present invention and welding gun are installed together, and, can realize the Tracking Recognition of butt welded seam, make welding gun can aim at weld seam accurately by the scanning motion of sensor control welding gun.
The specific embodiment two: referring to Fig. 1, the difference of the present embodiment and the specific embodiment one is that it has increased it and has increased centering ring 8, have several through holes 8-1 on the centering ring 8, centering ring 8 is arranged on the junction of the nozzle lumen 3-1 of the rifle body lumen 2-1 of lower gun body 2 and constricting nozzle 3, and the lower end of tungsten electrode 4 is encircled the through hole 8-1 at 8 centers and passed from being positioned at centering.Other structure is identical with the specific embodiment one.The material of centering ring 8 is heat-resistant insulation material (as a pottery), is used for locating tungsten electrode 4, makes its center of aiming at the spout 6 of constricting nozzle 3, can better improve the stable and repeatable of plasma flame flow.
The specific embodiment three: referring to Fig. 1, the difference of the present embodiment and the specific embodiment three is that it has increased by first sealing ring 11 and second sealing ring 12, first sealing ring 11 is arranged on the junction of rifle body lumen 2-1 and nozzle lumen 3-1, and second sealing ring 12 is arranged on the junction of external chamber 2-2 of rifle and nozzle exocoel 3-2.Other structure is identical with the specific embodiment one.Cooling water can cause the sensor damage if leakage takes place when the junction of the nozzle exocoel 3-2 by external chamber 2-2 of the rifle of lower gun body 2 and constricting nozzle 3, the material of first sealing ring 11 and second sealing ring 12 is insulating materials (as a rubber), can effectively prevent leakage of cooling water, improve the security of sensor.
The specific embodiment four: referring to Fig. 1, the difference of the present embodiment and the specific embodiment one is that tungsten electrode folder 5 is made up of chuck 5-1, nut 5-2 and bolt 5-3, the center of chuck 5-1 has through hole, have internal thread in the through hole, tungsten electrode 4 passes in through hole, and nut 5-2 and bolt 5-3 are threaded with the two ends of chuck 5-1 respectively.Other structure is identical with the specific embodiment one.When tungsten electrode 4 damages or is aging, turn on nut 5-2 and bolt 5-3 promptly takes off tungsten electrode 4, change re-use more convenient.
The specific embodiment five: the material of the upper cutting gun 1 of present embodiment is selected bakelite or engineering plastics for use, and the material of lower gun body 2 is selected fine copper or albronze for use, and the material of constricting nozzle 3 is selected Kufil for use.
Claims (9)
1, microbeam plasma arc scanning type weld seam tracking sensor, it comprises upper cutting gun (1), lower gun body (2), constricting nozzle (3) and tungsten electrode (4), upper cutting gun (1), lower gun body (2) and constricting nozzle (3) all are cavity structure, the inner chamber that it is characterized in that lower gun body (2) is divided into two cavitys of rifle body lumen (2-1) and the external chamber of rifle (2-2), the inner chamber of constricting nozzle (3) is divided into nozzle lumen (3-1) and two cavitys of nozzle exocoel (3-2), fixedly connected with the top of lower gun body (2) in the bottom of upper cutting gun (1), the inner chamber of upper cutting gun (1) is connected with the rifle body lumen (2-1) of lower gun body (2), fixedly connected with the top of constricting nozzle (3) in the bottom of lower gun body (2), the rifle body lumen (2-1) of lower gun body (2) is connected with the nozzle lumen (3-1) of constricting nozzle (3), the external chamber of rifle (2-2) of lower gun body (2) is connected with the nozzle exocoel (3-2) of constricting nozzle (3), the top of upper cutting gun (1) is provided with tungsten electrode folder (5), tungsten electrode (4) is arranged on the tungsten electrode folder (5), the upper end of tungsten electrode (4) is positioned at the outside at upper cutting gun (1) top, the lower end of tungsten electrode (4) be positioned at constricting nozzle (3) nozzle lumen (3-1) and and the spout (6) of constricting nozzle (3) between form slit (13), the upper end of the lateral wall of upper cutting gun (1) is provided with ion airway (7), the intracavity inter-connection of one end of ion airway (7) and upper cutting gun (1), enter the upper end that cooling water pipe (9) is arranged on the lateral wall of lower gun body (2), go out the lower end that cooling water pipe (10) is arranged on the lateral wall of lower gun body (2), an end that advances cooling water pipe (9) and go out cooling water pipe (10) is connected with the external chamber of rifle (2-2) of lower gun body (2) respectively.
2, microbeam plasma arc scanning type weld seam tracking sensor according to claim 1, it is characterized in that it has increased centering ring (8), have several through holes (8-1) on the centering ring (8), centering ring (8) is arranged on the junction of rifle body lumen (2-1) with the nozzle lumen (3-1) of constricting nozzle (3) of lower gun body (2), and the lower end of tungsten electrode (4) is passed from the through hole (8-1) that is positioned at centering ring (8) center.
3, microbeam plasma arc scanning type weld seam tracking sensor according to claim 1, it is characterized in that it has increased by first sealing ring (11) and second sealing ring (12), first sealing ring (11) is arranged on the junction of rifle body lumen (2-1) and nozzle lumen (3-1), and second sealing ring (12) is arranged on the junction of external chamber of rifle (2-2) and nozzle exocoel (3-2).
4, microbeam plasma arc scanning type weld seam tracking sensor according to claim 1, it is characterized in that tungsten electrode presss from both sides (5) and is made up of chuck (5-1), nut (5-2) and bolt (5-3), the center of chuck (5-1) has through hole, have internal thread in the through hole, tungsten electrode (4) passes in through hole, and nut (5-2) and bolt (5-3) are threaded with the two ends of chuck (5-1) respectively.
5, microbeam plasma arc scanning type weld seam tracking sensor according to claim 1, the external diameter that it is characterized in that sensor is 15～20mm, entire length is 80～150mm.
6, microbeam plasma arc scanning type weld seam tracking sensor according to claim 1, the material that it is characterized in that described upper cutting gun (1) is an insulating materials, the material of described lower gun body (2) is a Heat Conduction Material, and the material of described constricting nozzle (3) is a conductive heat conducting material.
7, microbeam plasma arc scanning type weld seam tracking sensor according to claim 6, the material that it is characterized in that described upper cutting gun (1) is bakelite or engineering plastics, the material of described lower gun body (2) is fine copper or albronze, and the material of described constricting nozzle (3) is a Kufil.
8, microbeam plasma arc scanning type weld seam tracking sensor according to claim 2 is characterized in that the material of described centering ring (8) is pottery.
9, microbeam plasma arc scanning type weld seam tracking sensor according to claim 3 is characterized in that the material of described first sealing ring (11) and second sealing ring (12) is an elastomeric material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100725311A CN100482396C (en) | 2007-07-20 | 2007-07-20 | Microbeam plasma arc scanning type weld seam tracking sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100725311A CN100482396C (en) | 2007-07-20 | 2007-07-20 | Microbeam plasma arc scanning type weld seam tracking sensor |
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| Publication Number | Publication Date |
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| CN101088693A true CN101088693A (en) | 2007-12-19 |
| CN100482396C CN100482396C (en) | 2009-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100725311A Expired - Fee Related CN100482396C (en) | 2007-07-20 | 2007-07-20 | Microbeam plasma arc scanning type weld seam tracking sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825364A (en) * | 2012-09-12 | 2012-12-19 | 湘潭大学 | Magnetic-control arc sensor device applied in seam tracking |
| CN105537739A (en) * | 2016-02-25 | 2016-05-04 | 哈尔滨工业大学（威海） | Negative electrode forced cooling and magnetic control compression combined type small hole TIG welding device |
| CN107105564A (en) * | 2015-10-14 | 2017-08-29 | 天津大学 | Laser welding small hole plasma electric properties detection method |
| CN109332858A (en) * | 2018-11-28 | 2019-02-15 | 江苏科技大学 | A kind of hollow tungsten electrode profundity melts the welding method of TIG filler wire welding slab |
| CN116275413A (en) * | 2023-03-15 | 2023-06-23 | 哈尔滨工业大学 | Narrow-gap GTAW welding gun capable of synchronously swinging wire arcs |
-
2007
- 2007-07-20 CN CNB2007100725311A patent/CN100482396C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825364A (en) * | 2012-09-12 | 2012-12-19 | 湘潭大学 | Magnetic-control arc sensor device applied in seam tracking |
| CN107105564A (en) * | 2015-10-14 | 2017-08-29 | 天津大学 | Laser welding small hole plasma electric properties detection method |
| CN107105564B (en) * | 2015-10-14 | 2019-03-26 | 天津大学 | Laser welding small hole plasma electric properties detection method |
| CN105537739A (en) * | 2016-02-25 | 2016-05-04 | 哈尔滨工业大学（威海） | Negative electrode forced cooling and magnetic control compression combined type small hole TIG welding device |
| CN109332858A (en) * | 2018-11-28 | 2019-02-15 | 江苏科技大学 | A kind of hollow tungsten electrode profundity melts the welding method of TIG filler wire welding slab |
| CN116275413A (en) * | 2023-03-15 | 2023-06-23 | 哈尔滨工业大学 | Narrow-gap GTAW welding gun capable of synchronously swinging wire arcs |
| CN116275413B (en) * | 2023-03-15 | 2023-12-05 | 哈尔滨工业大学 | Narrow-gap GTAW welding gun capable of synchronously swinging wire arcs |
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| CN100482396C (en) | 2009-04-29 |
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Granted publication date: 20090429 Termination date: 20110720 |