CN1584583A - Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof - Google Patents
Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof Download PDFInfo
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- CN1584583A CN1584583A CN03139148.6A CN03139148A CN1584583A CN 1584583 A CN1584583 A CN 1584583A CN 03139148 A CN03139148 A CN 03139148A CN 1584583 A CN1584583 A CN 1584583A
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Abstract
A method and device for on-line crack detection of metal pipe, bar and wire rod in high speed includes installing vortex detecting mechanism formed by point detection probe, control processor, alarm signal annoucer and battery on a rotating mechanism in high-speed rotation; detecting axial slowly varying defect and annoucing relevant alarm signal by vortex detecting mechanism in high speed as feeding metal pipe bar and wire rod in along axial move.
Description
Affiliated technical field
The present invention relates to a kind of method and device thereof that utilizes eddy current test material defective, especially utilize eddy current to test the method and the device thereof of the metal tube of high speed feed, rod, wire rod defective.
Background technology
In the commercial production, the electromagnetic eddy Dynamic Non-Destruction Measurement is mainly adopted in the test of small diameter metal tube whose, rod, wire rod defective.For example, the detection of the copper pipe (coil pipe) that refrigerator, air-conditioning condenser are used because speed of production is more and more faster, it is reported that the maximum economic rate of production (MERP) can reach 550 meters/minute, and domestic Ai Desen company has developed the eddy current testing instrument that adopts through mode differential winding sensor.Can online detection reach 780 meters/minute metal tube, rod, the mutation defect of wire rod by speed.For reducing cost, to raise the efficiency, the wall thickness of condenser tube is more and more thin, and increases internal thread technology again, and the difficulty of end product quality control is increased, and the formula defective of gradually splitting especially longitudinally appears in the production tube more and more.But, adopt the eddy current testing instrument of through mode differential winding sensor can't find gradual longitudinal defect.For gradual longitudinal defect, the prior art method is to use point type eddy current probe, EDDY CURRENT processor controls and alerting signal display to constitute rotary eddy current testing device.The point type eddy current probe is installed on the rotating mechanism; EDDY CURRENT processor controls and alerting signal display are installed on the fixing frame; Point type eddy current probe in the rotation is realized being electrically connected with the logical overcoupling mechanism of static EDDY CURRENT processor controls; The output terminal of EDDY CURRENT processor controls connects the alerting signal display.When moving along the axis of rotating mechanism, the metal tube of high speed feed, rod, wire rod be rotated scanning by the point type eddy current probe, at this moment Tan Tou excitation input signal and detection output signal are all through overcoupling mechanism and EDDY CURRENT processor controls UNICOM, and the gradual axial flaw information that the EDDY CURRENT processor controls will detect is transferred to the alerting signal display and shown.The version that lotus root is closed mechanism has a variety of, but all has intrinsic defective.It is big to close mechanism's noise as the brush lotus root, and speed is low; The saturated aqueous common salt lotus root is closed mechanism, the mercury lotus root is closed mechanism's tightness and is difficult for guaranteeing and having corrosion or poisonous; Capacitive coupling mechanism is because of an eddy current excitation frequency hundreds of KHz only, and excitation frequency is low, and capacitive coupling mechanism is difficult for making; The rotary transformer lotus root is closed mechanism owing to can produce rotational noise, requires the machining precision height, the cost height.For metal tube, rod, occasion that the wire rod speed of feed is very high, be difficult to utilize existing lotus root to close the rotary eddy current testing device that mechanism produces the use point type eddy current probe that meets online detection demand.
Summary of the invention
The present invention aims to provide and does not a kind ofly need lotus root to close mechanism and can detect high-velocity tube, rod, the wire rod line flaw detection method of gradual axial flaw.
Second purpose of the present invention provides and a kind ofly do not need lotus root to close mechanism and can detect high-velocity tube, rod, the wire rod line flaw detection device of gradual axial flaw
The objective of the invention is to realize by following scheme: high speed metal tube, rod, wire rod line flaw detection method will comprise that the EDDY CURRENT mechanism that point type eddy current probe, EDDY CURRENT processor controls and alerting signal transmitter and their supply unit constitute is installed on the rotating mechanism of a high speed rotating; In high speed rotating, survey gradual axial flaw and send corresponding alerting signal by EDDY CURRENT mechanism when the metal tube of high speed feed, rod, wire rod move along the axis of rotating mechanism.
Second purpose of the present invention realizes by following scheme: high speed metal tube, rod, wire rod line flaw detection device comprise that a point type eddy current probe, one pop one's head in into electrical connection and to its EDDY CURRENT processor controls of controlling and corresponding data being handled with aforementioned; Described probe comprises the detecting device of the field coil of a support, a rack-mount generation point type eddy current magnetism, detection metal tube that at least one is rack-mount, rod, wire rod point type resultant magnetic field; The electric connection line of described field coil and detecting device is outwards drawn from the support and is connected described processor controls, it is characterized in that: further comprising an alerting signal transmitter that is connected with the processor controls output terminal; The EDDY CURRENT mechanism that described probe, processor controls and alerting signal transmitter and their supply unit constitute is installed on the rotating mechanism of a high speed rotating.
Be provided with adjusting mechanism radially between the support of described probe and the rotating mechanism.
Described rotating mechanism is fixedlyed connected with the rotor of a core motor or the hollow rotating shaft of a high speed rotating.
Described supply unit is miniature high-capacity battery; Or supply unit comprises the electromagnetic field mechanism of a loop configuration of inductive power supply mechanism that the electromagnetic induction coil that is installed in the rotating mechanism periphery and regulator rectifier circuit are formed and the outside that is fixed on the rotating mechanism periphery; Two ac input ends of the regulator rectifier circuit of inductive power supply mechanism connect two terminations of electromagnetic induction coil respectively; The electromagnetic induction coil of inductive power supply mechanism is installed in the Huan Xinchu of electromagnetic field mechanism; The process that the inductive power supply mechanism of this supply unit rotates in this electromagnetic field mechanism produces electric energy.
Described alerting signal transmitter is acoustical signal alarm or light alarm device or radio signal alarm.
And then it also has the alerting signal of a described alerting signal transmitter of response, has gradual axial flaw partly to carry out the mark machine of mark to metal tube, rod, wire rod.
Further, described alerting signal transmitter also includes the control signal receiving circuit, this control signal receiving circuit is connected with the control input end of processor controls, and other has a control signal transmitter to cooperate with the control signal receiving circuit, and sends control information to it.
And described control signal transmitter also includes the alerting signal receiving circuit, and this control signal transmitter is connected with the I/O interface of a PC; After PC is specified the order of passback detection data by the control signal receiving circuit of control signal transmitter and alerting signal transmitter to the processor controls transmission, processor controls detects data by the alerting signal receiving circuit of alerting signal transmitter and control signal transmitter to the PC passback, carries out post analysis process by PC.
High-velocity tube of the present invention, rod, wire rod line flaw detection method and device thereof, broken through EDDY CURRENT processor controls circuit complexity in the past, power consumption is many, volume is big, Heavy Weight, can not be installed on the rotating mechanism of high speed rotating and the point type eddy current probe is installed on the rotating mechanism of high speed rotating, must utilize lotus root to close the excitation input signal that mechanism will pop one's head in again and detect output signal and EDDY CURRENT processor controls lotus root is closed the traditional concept of UNICOM.It utilizes the microelectronic integrated circuit technology to make little lightweight EDDY CURRENT processor controls of volume and alerting signal transmitter, and using microminiaturized high-octane battery to solve power issue, the EDDY CURRENT mechanism of the microminiaturization of formation is installed on the rotating mechanism of a high speed rotating becomes practicable technical scheme.Supply unit adopts electromagnetic induction coil and the regulator rectifier circuit with the rotating mechanism rotation, and is fixed on the induction power supply device that the electromagnetic field device of a loop configuration in the outside of rotating mechanism periphery is formed, and can avoid changing battery.It has been got rid of lotus root and has closed mechanism, has fundamentally eliminated lotus root and has closed noise and the various additional cost that mechanism produces.It is at gradual axial flaw information characteristic of simple, utilize light/sound/wireless simple alerting signal transmitter issue alerting signal, can exempt the complicated circuit construction that general eddy current testing device picture and text show, reduce cost, can in time provide direct prompting again.Alerting signal is directly carried out mark to defective part after being received by the mark machine, makes being reflected on the product of visual result of detection.Be provided with adjusting mechanism radially between the support of probe and the rotating mechanism, can adapt to the demand that many specifications are produced.Rotating mechanism is driven by the rotor of core motor or hollow rotating shaft, and annexation is simple, is convenient to metal tube, rod, wire rod and passes through from the rotor of rotating mechanism and core motor or the axis high speed of hollow rotating shaft.Make the alerting signal transmitter possess the function of emission/reception two-way exchange, on the one hand the working method of EDDY CURRENT mechanism and state are controlled, can make the detection data of EDDY CURRENT mechanism be sent to the enterprising behaviour post analysis processing of PC on the other hand.Improve the level of automatic management.
Description of drawings
Fig. 1 is the structural representation of an embodiment of high speed metal tube of the present invention, rod, wire rod line flaw detection device.
Fig. 2 is the structural representation of another embodiment of high speed metal tube of the present invention, rod, wire rod line flaw detection device.
Fig. 3 is the circuit structure block diagram of Fig. 2 embodiment.
Embodiment
The structure of an embodiment of high speed metal tube of the present invention, rod, wire rod line flaw detection device sees also Fig. 1.This line flaw detection device has a frame that fixes on the ground 8, frame 8 inner hollow, and a supplementary bearing 5 is respectively installed in the both sides of waist, wears the rotating mechanism main shaft 9 of fixation hollow in this two supplementary bearing 5.The front end of main shaft 9 inside is provided with a pair of centring sleeve 2, and the rear end is provided with one and imports cover 10; The metal tube that high-speed straight-line moves, rod, wire rod 1 enter main shaft 9 inside from the center pit that imports cover 10, draw main shaft 9 outsides after the center pit of two centring sleeves 2 passes.Two centring sleeves 2 make metal tube, rod, wire rod 1 remain on main shaft 9 axial location in this section of main shaft 9 inside with importing cover 10.The part periphery that main shaft 9 stretches out frame 8 front ends is provided with a plurality of adjusting mechanisms 4 evenly distributedly, a point type eddy current probe 3 is installed on each adjusting mechanism 4, and the tube wall that each point type eddy current probe 3 passes main shaft 9 stretches to the axis and the point midway between two centring sleeves 2 of main shaft 9; Each point type eddy current probe 3 is done adjustment radially on all can the adjusting mechanism 4 under it, adjusts to best measuring position with the diameter of corresponding metal tube, rod, wire rod 1.The outside of each point type eddy current probe 3 is supports, and internal stent is equipped with the field coil and the detecting device that detects the point type resultant magnetic field of metal tube, rod, wire rod 1 that produce the point type eddy current magnetism; The electric connection line of field coil and detecting device is outwards drawn from the support and is connected EDDY CURRENT processor controls 7.EDDY CURRENT processor controls 7 is installed in main shaft 9 and is in part in the frame 8, and its function is that each probe 3 is controlled and corresponding data is handled.The schematic circuit of EDDY CURRENT processor controls 7 is same as the prior art, but it utilizes the manufacturing of microelectronic integrated circuit technology, and uses microminiaturized high-octane battery.The part that main shaft 9 is in the frame 8 also is equipped with an alerting signal transmitter 12, and it becomes to be electrically connected with processor controls 7 output terminals.Alerting signal transmitter 12 can be acoustical signal alarm or light alarm device or the radio signal alarm that utilizes the microelectronic integrated circuit technology to make according to concrete Environment Design.Main shaft 9 is in parts in the frame 8 to be gone back fixed cover a hollow rotating shaft 11 is housed, the frame 8 outer main motors 6 that a high speed rotating is installed, and main motor 6 drives hollow rotating shaft 11 and main shaft 9 high speed rotating by gear train.Thereby respectively pop one's head in 3, processor controls 7, alerting signal transmitter 12 also rotate with main motor 6 and main shaft 9 high speed rotating.When the metal tube of high speed feed, rod, wire rod 1 move along the axis of rotating mechanism main shaft 9 by EDDY CURRENT mechanism respectively pop one's head in 3, processor controls 7, alerting signal transmitter 12 survey gradual axial flaw and send corresponding alerting signal in high speed rotating.
Certainly, rotating mechanism main shaft 9 can also adopt the structure of fixedlying connected with the rotor of a core motor and save frame 8.Particularly, high speed metal tube of the present invention, rod, wire rod line flaw detection device, the alerting signal that can also be furnished with a described alerting signal transmitter 12 of response has gradual axial flaw partly to carry out the mark machine of mark to metal tube, rod, wire rod 1.
The structure of another embodiment of high speed metal tube of the present invention, rod, wire rod line flaw detection device sees also Fig. 2.Contrast the structure of last embodiment shown in Figure 1, the structure difference of the structure of present embodiment and last embodiment has following several respects:
At frame 8 rear inside faces, be fixed with an electromagnetic field device 13 with the coaxial loop configuration of main shaft 9 in the outer fix of main shaft 9 peripheries, be positioned at the inductive power supply mechanism 14 that electromagnetic field device 13 ring heart places' installings are made up of electromagnetic induction coil 141 and regulator rectifier circuit 142 in main shaft 9 peripheries.Two ac input ends of the regulator rectifier circuit 142 of inductive power supply mechanism 14 connect two terminations of electromagnetic induction coil 141 respectively.Electromagnetic induction coil 141 is near the inside surface of the electromagnetic field device 13 ring hearts.The process that inductive power supply mechanism 14 rotates in this electromagnetic field device 13 produces electric energy.
The frame 8 front ends outside is in the position of drawing main shaft 9 near metal tube, rod, wire rod 1, and being equiped with has gradual axial flaw partly to carry out the mark machine 16 of mark to metal tube, rod, wire rod 1.Mark machine 16 is connected with control signal transmitter 15, when the alerting signal receiving circuit of control signal transmitter 15 is received the axial flaw alerting signal of alerting signal transmitter 12 transmissions, promptly send the mark control information to mark machine 16, the axial flaw of 16 pairs of metal tubes of mark machine, rod, wire rod 1 partly carries out mark.Certainly, mark machine 16 also can be arranged to partly carry out mark by the axial flaw that PC 17 is controlled metal tube, rod, wire rod 1.
See also the circuit structure block diagram of present embodiment shown in Figure 3.Discuss the still unspecified intelligentized EDDY CURRENT processor controls 7 in front.The central module of processor controls 7 is one-chip computers 71 that load intelligentized EDDY CURRENT control program in advance.One group of I/O port of one-chip computer 71 forms two-way the connection with the alerting signal transmitter 12 of processor controls 7 outsides, to receive control signal or the instruction that alerting signal transmitter 12 transmits, perhaps send alerting signal or send the detection data to PC 17 through alerting signal transmitter 12 to alerting signal transmitter 12.One-chip computer 71 is through address/data bus difference connection oscillator 72, quadrature detector 74, the automatic gain controller 75 of processor controls 7 inside.One-chip computer 71 connects the control input end of wave filter 77, phase rotation circuit 78 and A/D converter 79 respectively through 3 output lines of the I/O bus of processor controls 7 inside; The data output end of A/D converter 79 connects one-chip computer 71 through the incoming line of the I/O bus of processor controls 7 inside.The analog output of oscillator 72 connects the analog input end of driving amplifier 73, and the output terminal of driving amplifier 73 connects the analog input end of the point type eddy current probe 3 of processor controls 7 outsides.The analog output of point type eddy current probe 3 connects the analog input end of the prime amplifier 76 of processor controls 7 inside.The analog output of prime amplifier 76 connects the analog input end of automatic gain controller 75.The analog output of automatic gain controller 75 connects the analog input end of quadrature detector 74.The analog output of quadrature detector 74 connects the analog input end of wave filter 77.The analog output of wave filter 77 connects the analog input end of phase rotation circuit 78.The analog output of phase rotation circuit 78 connects the analog input end of A/D converter 79.
Claims (13)
1. high speed metal tube, rod, wire rod line flaw detection method is characterized in that: will comprise that the EDDY CURRENT mechanism that point type eddy current probe, EDDY CURRENT processor controls and alerting signal transmitter and their supply unit constitute is installed on the rotating mechanism of a high speed rotating; In high speed rotating, survey gradual axial flaw and send corresponding alerting signal by EDDY CURRENT mechanism when the metal tube of high speed feed, rod, wire rod move along the axis of rotating mechanism.
2. high speed metal tube, rod, wire rod line flaw detection device comprise that a point type eddy current probe, one pop one's head in into electrical connection and to its EDDY CURRENT processor controls of controlling and corresponding data being handled with aforementioned; Described probe comprises the detecting device of the field coil of a support, a rack-mount generation point type eddy current magnetism, detection metal tube that at least one is rack-mount, rod, wire rod point type resultant magnetic field; The electric connection line of described field coil and detecting device is outwards drawn from the support and is connected described processor controls, it is characterized in that: further comprising an alerting signal transmitter that is connected with the processor controls output terminal; The EDDY CURRENT mechanism that described probe, processor controls and alerting signal transmitter and their supply unit constitute is installed on the rotating mechanism of a high speed rotating.
3. high speed metal tube according to claim 2, rod, wire rod line flaw detection device is characterized in that: be provided with adjusting mechanism radially between the support of described probe and the rotating mechanism.
4. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described rotating mechanism is fixedlyed connected with the rotor of a core motor.
5. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described rotating mechanism is fixedlyed connected with the hollow rotating shaft of a high speed rotating.
6. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described supply unit is miniature high-capacity battery.
7. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described supply unit comprises the electromagnetic field mechanism of a loop configuration of inductive power supply mechanism that the electromagnetic induction coil that is installed in the rotating mechanism periphery and regulator rectifier circuit are formed and the outside that is fixed on the rotating mechanism periphery; Two ac input ends of the regulator rectifier circuit of inductive power supply mechanism connect two terminations of electromagnetic induction coil respectively; The electromagnetic induction coil of inductive power supply mechanism is installed in the Huan Xinchu of electromagnetic field mechanism; The process that the inductive power supply mechanism of this supply unit rotates in this electromagnetic field mechanism produces electric energy.
8. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described alerting signal transmitter is the acoustical signal alarm.
9. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described alerting signal transmitter is the light alarm device.
10. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described alerting signal transmitter is the radio signal alarm.
11. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: it also has the alerting signal of a described alerting signal transmitter of response, has gradual axial flaw partly to carry out the mark machine of mark to metal tube, rod, wire rod.
12. according to claim 2 or 3 described high speed metal tubes, rod, wire rod line flaw detection device, it is characterized in that: described alerting signal transmitter also includes the control signal receiving circuit, this control signal receiving circuit is connected with the control input end of processor controls, other has a control signal transmitter to cooperate with the control signal receiving circuit, and sends control information to it.
13. high speed metal tube according to claim 12, rod, wire rod line flaw detection device is characterized in that: described control signal transmitter also includes the alerting signal receiving circuit, this control signal transmitter is connected with the I/O interface of a PC; After PC is specified the order of passback detection data by the control signal receiving circuit of control signal transmitter and alerting signal transmitter to the processor controls transmission, processor controls detects data by the alerting signal receiving circuit of alerting signal transmitter and control signal transmitter to the PC passback, carries out post analysis process by PC.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031391486A CN100365414C (en) | 2003-08-18 | 2003-08-18 | Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031391486A CN100365414C (en) | 2003-08-18 | 2003-08-18 | Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof |
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| CN1584583A true CN1584583A (en) | 2005-02-23 |
| CN100365414C CN100365414C (en) | 2008-01-30 |
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| CNB031391486A Expired - Fee Related CN100365414C (en) | 2003-08-18 | 2003-08-18 | Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458436C (en) * | 2007-02-14 | 2009-02-04 | 沈阳银捷机械装备制造有限责任公司 | Multifunction electromagnetic flaw detection device |
| CN102253113A (en) * | 2011-04-27 | 2011-11-23 | 苏州龙骏无损检测设备有限公司 | Transformer type high-speed signal coupling transmitter |
| CN102338774A (en) * | 2011-06-23 | 2012-02-01 | 苏州龙骏无损检测设备有限公司 | Coaxially-rotating signal coupling transmitter |
| CN101258510B (en) * | 2005-08-02 | 2012-05-09 | Og技术公司 | Apparatus and method for detecting surface defects on a workpiece such as a rolled/drawn metal bar |
| CN103286803A (en) * | 2013-05-30 | 2013-09-11 | 广东联塑机器制造有限公司 | Coreless-motor-driven rotary centrifugal chipless cutting machine |
| CN107835941A (en) * | 2015-08-03 | 2018-03-23 | 日锻汽门株式会社 | The defect detecting test method and device in the axis connection portion of engine valve |
| CN109115866A (en) * | 2018-07-18 | 2019-01-01 | 清华大学 | Rotate in a circumferential direction point type eddy current sensor and detection method |
| CN111360371A (en) * | 2020-03-09 | 2020-07-03 | 哈尔滨威尔焊接有限责任公司 | Method for detecting stability of gas shielded welding wire welding process |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435670B (en) * | 2011-11-30 | 2014-05-28 | 上海易尔电磁技术有限公司 | Method and device for controlling undetectable region at end of metal tube bar |
| CN104801570B (en) * | 2015-05-11 | 2016-04-06 | 广东骏驰科技股份有限公司 | The online caliber checkout gear of a kind of automobile pipe fitting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3693075A (en) * | 1969-11-15 | 1972-09-19 | Forster F M O | Eddy current system for testing tubes for defects,eccentricity,and wall thickness |
| SE347356B (en) * | 1970-03-20 | 1972-07-31 | Essem Metotest Ab | |
| JPH0254165A (en) * | 1988-08-19 | 1990-02-23 | Kobe Steel Ltd | Vortex flaw detection method of pipe and bar material |
| CN1409107A (en) * | 2001-09-29 | 2003-04-09 | 中国科学院金属研究所 | Supersonic and eddy composite automatic detector for pipe |
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2003
- 2003-08-18 CN CNB031391486A patent/CN100365414C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101258510B (en) * | 2005-08-02 | 2012-05-09 | Og技术公司 | Apparatus and method for detecting surface defects on a workpiece such as a rolled/drawn metal bar |
| CN100458436C (en) * | 2007-02-14 | 2009-02-04 | 沈阳银捷机械装备制造有限责任公司 | Multifunction electromagnetic flaw detection device |
| CN102253113A (en) * | 2011-04-27 | 2011-11-23 | 苏州龙骏无损检测设备有限公司 | Transformer type high-speed signal coupling transmitter |
| CN102338774A (en) * | 2011-06-23 | 2012-02-01 | 苏州龙骏无损检测设备有限公司 | Coaxially-rotating signal coupling transmitter |
| CN103286803A (en) * | 2013-05-30 | 2013-09-11 | 广东联塑机器制造有限公司 | Coreless-motor-driven rotary centrifugal chipless cutting machine |
| CN107835941A (en) * | 2015-08-03 | 2018-03-23 | 日锻汽门株式会社 | The defect detecting test method and device in the axis connection portion of engine valve |
| CN109115866A (en) * | 2018-07-18 | 2019-01-01 | 清华大学 | Rotate in a circumferential direction point type eddy current sensor and detection method |
| CN109115866B (en) * | 2018-07-18 | 2022-07-22 | 清华大学 | Circumferential rotation point type eddy current sensor and detection method |
| CN111360371A (en) * | 2020-03-09 | 2020-07-03 | 哈尔滨威尔焊接有限责任公司 | Method for detecting stability of gas shielded welding wire welding process |
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| CN100365414C (en) | 2008-01-30 |
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