CN204758540U - Quick nondestructive test device of sheet metal overlap joint bead weld supersound - Google Patents
Quick nondestructive test device of sheet metal overlap joint bead weld supersound Download PDFInfo
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- CN204758540U CN204758540U CN201520416420.8U CN201520416420U CN204758540U CN 204758540 U CN204758540 U CN 204758540U CN 201520416420 U CN201520416420 U CN 201520416420U CN 204758540 U CN204758540 U CN 204758540U
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Abstract
The utility model provides a quick nondestructive test device of sheet metal overlap joint bead weld supersound, it can carry out quick ultrasonic testing to sheet metal overlap joint laser welding seam, realizes the quality evaluation of sheet metal overlap joint laser welding seam, finds the defect in the welding seam in advance, guarantees product quality. The device is including two probes, the appearance of detecting a flaw, operation part, and the ultrasonic wave of left side probe transmission returns through launch, propagate, meet welding seam left side wall, by the pop one's head in whole in -process of wafer receipt of left side, and ultrasonic wave transmission's distance (being the sound path) is S1, in like manner right side sound path is S2. The sound wave of probe transmission meets nearest welding seam wall, then reflects and received by former probe, twice that the sound wave was propagated this moment leaves apart from the nearly span of welding seam for probe transmission wafer apart from S, and weld width W=L+2L0 - (S1+S2) / 2, L0 is the forward position length of probe, and two probes can be followed the welding seam and slided, adopt the operation part can obtain the testing result rapidly after the process of looking into completion is swept to the probe.
Description
Technical field
The utility model belongs to rail vehicle welding field, is specifically related to a kind of city rail, passenger train sheet lap laser welded seam Rapid non-destructive testing device.
Background technology
Bring into use Laser Welding (LBW) to weld urban rail car body at present, the feature of this type of welded seam is that the melting area of welding seam is especially carefully narrow.In whole welding process, due to defects such as the factors such as this type of unusual fluctuations of welding method welding parameter, workpiece assembling are easy to cause rosin joint, incomplete fusion, molten wide too narrow or fusion penetration too shallow, have a strong impact on the quality of weld seam, great economic loss and security incident may be caused.And for sheet lap bead weld, molten wide butt junction Effect on Mechanical Properties is maximum, therefore butt welded seam is needed to melt wide detection exactly to the subject matter that overlap joint bead weld detects.Can directly reject the molten substandard weld seam of wide size; Molten wide size reaches standard and weld seam without other defect is qualified, does not also have sheet lap bead weld to melt wide Dynamic Non-Destruction Measurement at present.
Utility model content
For above one or more problems, the utility model provides that a kind of sheet lap laser bead weld is ultrasonic sweeps Rapid non-destructive testing device, it can detect lap weld quality, particularly can melt the wide Dynamic Non-Destruction Measurement measured to bead weld, have easy and simple to handle, with low cost, the features such as applicability is strong.Use this device, quick Ultrasonic Detection can be carried out to sheet lap laser welded seam, realize the quality assessment of sheet lap laser welded seam, find the defect in weld seam in advance, ensure product quality.
The utility model belongs to product independent research technology.Design concept of the present utility model is: by two probes, the ultrasound wave that left side probe is launched returns through launching, propagating, run into weld seam left side wall, by the whole process of left side probe wafer receipt, the distance (i.e. sound path) of ultrasonic propagation is S1; In like manner right side sound path is S2.According to sonic propagation characteristic, the sound wave that probe is launched runs into nearest weld seam wall, then reflect and received by former probe, the distance S that now sound wave is propagated be probe launch wafer apart from the nearly span of weld seam from twice, i.e. S1=2 (L1+L0), S2=2 (L2+L0).Weld width W=L+2L0-(S1+S2)/2 can be calculated according to above data.According to this principle, this device of utility model, carries out modular design by weld width computation process, can obtain testing result rapidly after probe scanning process completes.
The technical solution of the utility model is:
The ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld, is characterized in that, comprise the first probe, the second probe, defectoscope, arithmetic unit, particularly:
First probe is arranged on the left of weld seam, and the second probe is arranged on the right side of weld seam, and first, second probe all has the function of signal transmitting and receiving concurrently, and the line of the acoustic axis axis of first, second probe is perpendicular to weld seam;
Arithmetic unit is popped one's head in first, second pop one's head in, defectoscope is connected;
Defectoscope is popped one's head in first, second pop one's head in be connected and obtain sound path data;
Arithmetic unit comprises weld pool width computing module, data obtaining module, output module, human-computer interaction device, data obtaining module obtains sound path data from defectoscope, and data obtaining module connects human-computer interaction device and obtains distance between first, second probe and the forward position length of probe; Weld pool width computing module connection data obtains module, output module; Data obtaining module, output module all connect human-computer interaction device.
Further, the described data obtaining module distance comprised between two probes obtains the forward position length acquisition module of module, two probe sound path read modules, probe, and the forward position length of the distance acquisition module between two described probes, two probe sound path read modules, probe obtains the equal attachment weld of module and melts wide computing module.
Further, described weld pool width computing module calculates weld pool width: weld pool width W=L+2L0-(S1+S2)/2 according to following relational expression, wherein: the distance between two probes is L; Weld pool width is W; The ultrasound wave that left side probe is launched returns, by the distance of ultrasonic propagation the whole process of left side probe wafer receipt, i.e. left side sound path S1 from launching, propagating, run into weld seam left side wall; In like manner right side sound path is S2; L0 is the forward position length of probe, i.e. the propagation distance of sound wave within the scope of probe.
Further, the first described probe, the second probe are angle probe; The model of first, second described probe is identical.
Further, described defectoscope is the reflectoscope with B scan function.
Further, also be provided with carriage, carriage comprises driving mechanism, guide rail or slideway, the axis direction that carriage supplies the first probe respectively, the second probe is parallel to weld seam slides, driving mechanism comprises displacement controller, first probe, the second probe connection bit shift controller, displacement controller drives two probe synchronous slides.
Further, described arithmetic unit also comprises image-forming module, and image-forming module connects oscillograph, demonstrates the molten wide curve along bead direction.
The ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld, it is characterized in that, adopt the angle probe 1 of two same model, the scrambler 2 be connected with probe 1, the displacement controller 3 controlling probe 1 and scrambler 2 movement, reflectoscope 4, data processing and image-forming module 5 with B scan function, guide rail 6; The angle probe 1 of two same models is placed on guide rail 6, and angle probe 1 has the function of signal transmitting and receiving concurrently, is placed in the both sides of weld seam to be checked respectively, and the line of two angle probe 1 acoustic axis axis is perpendicular to weld seam; The accurate spacing and two controlling two probes 1 of displacement controller 3 is popped one's head in and is moved along bead direction; Reflectoscope 4 for encouraging the ultrasonic signal with receiving transducer 1, and shows detection waveform, then detection data is transferred to data processing and image-forming module 5; Data processing and image-forming module 5 receive the data of defectoscope 4 and displacement controller 3 simultaneously, calculate weld pool width and demonstrate the molten wide curve along bead direction.
Further, be provided with data processing module in described data processing and image-forming module, calculating the relational expression that weld pool width adopts in data processing module is: weld pool width W=L+2L0-(S1+S2)/2, wherein: the distance between two probes is L; Weld pool width is W; The ultrasound wave that left side probe is launched returns, by the distance of ultrasonic propagation the whole process of left side probe wafer receipt, i.e. left side sound path S1 from launching, propagating, run into weld seam left side wall; In like manner right side sound path is S2; L0 is the forward position length of probe, i.e. the propagation distance of sound wave within the scope of probe; Sound path S1, S2 read from defectoscope 4.
Accompanying drawing explanation
Fig. 1 is the structural drawing of an embodiment of the ultrasonic Rapid non-destructive testing device of sheet lap bead weld of the present utility model;
The schematic top plan view that when Fig. 2 is an embodiment detection of the utility model device, probe and guide rail are placed;
Fig. 3 is the probe place Acoustic Wave Propagation schematic diagram of an embodiment of the utility model device;
Fig. 4 is the Cleaning Principle schematic diagram of an embodiment of the utility model device;
Fig. 5 is the Acoustic Wave Propagation schematic diagram of an embodiment of the utility model device;
Fig. 6 is the ripple plotting table on the oscillograph of the utility model device;
Fig. 7 is the structural drawing of the arithmetic unit of an embodiment of the utility model device.
Embodiment
Now the utility model is further described in conjunction with the drawings and the specific embodiments:
As shown in Figure 1, two angle probes modes of emplacement on workpiece to be checked as shown in Figure 2 for the concrete connected mode of the utility model each several part.First probe 1 and guide rail 6 are placed on weld seam both sides, guide rail parallel is placed in weld seam, the transmitting axis of two probes perpendicular to weld seam and two axial lines on the same line, adjustment probe positions is fixing to suitable distance (about 5 ~ 50mm).In testing process, between probe, relative position is fixed all the time, and displacement controller 3 controls probe 1 entirety along weld movement, can detect the width of whole piece weld seam.The Signal transmissions that receives of probe 1 is to defectoscope 4, and the data after process reach data processing and image-forming module 5 again, finally can obtain weld seam everywhere molten wide and show with molten wide curve.
The principle that the utility model detects weld width is as follows:
Fig. 3 is angle probe hyperacoustic round when normally detecting.If the forward position length of two angle probes 1 is L0, ignore the propagation of sound wave in probe inside, then L0 can represent the propagation distance of sound wave within the scope of probe.
Fig. 4 is principle schematic when detecting weld seam.The distance of left probe front end distance weld seam left side wall is L1, right probe front end is L2 apart from the distance of weld seam right side wall, and the distance between probe is L.As shown in Figure 4, if weld pool width is W, then W=L-(L1+L2) is had.The ultrasound wave that left side probe is launched returns from launching, propagating, run into weld seam left side wall, is popped one's head in the whole process of wafer receipt by left side, and the distance (i.e. sound path) of ultrasonic propagation is S1; In like manner right side sound path is S2.Sound path S1, S2 can read from defectoscope 4.According to sonic propagation characteristic and Fig. 4, the sound wave that probe is launched runs into nearest weld seam wall, then reflect and received by former probe, the distance S that now sound wave is propagated be probe launch wafer apart from weld seam nearly span from twice, i.e. S1=2 (L1+L0), S2=2 (L2+L0).Weld width W=L+2L0-(S1+S2)/2 can be calculated according to above data.
According to above principle, weld width computation process is carried out modular design, testing result can be obtained rapidly after probe scanning process completes.
It is simple, easy and simple to handle that the sheet lap bead weld that the utility model provides melts wide the cannot-harm-detection device principle, and the manpower that less input just can detect on-the-spot lap weld quickly and accurately.
Preferred embodiment 1
The ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld, be that the method detection of being measured by quick nondestructive is melted wide, this device mainly comprises the angle probe 1 of two same model, the scrambler 2 be connected with probe 1, the displacement controller 3 controlling probe 1 and scrambler 2 movement, reflectoscope 4, data processing and image-forming module 5 with B scan function, guide rail 6.The angle probe 1 of two same models is placed on guide rail 6, and probe 1 has the function of signal transmitting and receiving concurrently, and be placed in the both sides of weld seam to be checked respectively, the line of two angle probe 1 acoustic axis axis is perpendicular to weld seam.The accurate spacing and two controlling two probes 1 of displacement controller 3 is popped one's head in and is moved along bead direction.Reflectoscope 4 for encouraging the ultrasonic signal with receiving transducer 1, and shows detection waveform, then detection data is transferred to data processing and image-forming module 5.Data processing and image-forming module 5 receive the data of defectoscope 4 and displacement controller 3 simultaneously, calculate weld pool width and demonstrate the molten wide curve along bead direction.
Arithmetic unit comprises weld pool width computing module, data obtaining module, output module, human-computer interaction device, data obtaining module obtains sound path data from defectoscope, and data obtaining module connects human-computer interaction device and obtains distance between first, second probe and the forward position length of probe; Weld pool width computing module connection data obtains module, output module; Data obtaining module, output module all connect human-computer interaction device.The data obtaining module distance comprised between two probes obtains the forward position length acquisition module of module, two probe sound path read modules, probe, and the forward position length of the distance acquisition module between two described probes, two probe sound path read modules, probe obtains the equal attachment weld of module and melts wide computing module.Weld pool width computing module calculates weld pool width: weld pool width W=L+2L0-(S1+S2)/2 according to following relational expression, wherein: the distance between two probes is L; Weld pool width is W; The ultrasound wave that left side probe is launched returns, by the distance of ultrasonic propagation the whole process of left side probe wafer receipt, i.e. left side sound path S1 from launching, propagating, run into weld seam left side wall; In like manner right side sound path is S2; L0 is the forward position length of probe, i.e. the propagation distance of sound wave within the scope of probe.
In the present embodiment, arithmetic unit is data processing and image-forming module 5, and data processing and image-forming module are also connected with oscillograph.
The model of first, second probe is identical.Also be provided with carriage, carriage comprises driving mechanism, guide rail or slideway, the axis direction that carriage supplies the first probe respectively, the second probe is parallel to weld seam slides, driving mechanism comprises displacement controller, first probe, the second probe connection bit shift controller, displacement controller is set to driving two and pops one's head in synchronous slide.
Carriage can adopt motor to drive and slide and mechanical linkage carriage, and probe can be installed on slide block and move.
Detection of the present utility model comprises the following steps:
Step1: first two probes 1 and guide rail 6 are placed on weld seam both sides, guide rail parallel is placed in weld seam, the transmitting axis of two probes perpendicular to weld seam and two axial lines on the same line, adjustment probe positions is fixing to suitable distance;
Step2: in testing process, between probe, relative position is fixed all the time, and displacement controller 3 controls probe 1 entirety along weld movement, can detect the width of whole piece weld seam; The Signal transmissions that probe 1 receives is to defectoscope 4, and the data after process reach data processing and image-forming module 5 again;
Step3: calculating the relational expression that weld pool width adopts in data processing and image-forming module is: weld pool width W=L+2L0-(S1+S2)/2, wherein: the distance between two probes is L; Weld pool width is W; The ultrasound wave that left side probe is launched returns, by the distance of ultrasonic propagation the whole process of left side probe wafer receipt, i.e. left side sound path S1 from launching, propagating, run into weld seam left side wall; In like manner right side sound path is S2; L0 is the forward position length of probe, i.e. the propagation distance of sound wave within the scope of probe; Sound path S1, S2 read from defectoscope 4;
Step4: result is sent on display device or oscillograph by data processing and image-forming module, obtains weld seam everywhere molten wide and with molten wide curve display.
As shown in Figure 5, two probes are distributed in weld seam both sides in operation.For left side angle probe, analyze the display situation of waveform on its propagation condition receiving and dispatching acoustic signals and oscillograph.
The left side sound wave that sends of angle probe 1 is propagated along upper plate to commissure, and when running into weld seam left side wall, according to sonic propagation characteristic, a branch of sound wave can disperse formation four bundle, as numbered in Fig. 5 1. ~ 4. shown in.1. acoustic beam directly can reflect back from commissure and be received by probe; 2. 3. 4. sound wave can continue forward direction until run into reflecting body, then turns back to probe along former road received.Certainly the acoustic signals wherein also having multiple reflections can be received by probe, but energy is very weak can ignore.Wherein 1. acoustic beam is weld seam reflection echo, is the echoed signal wishing to detect.Organic glass/the moisture film of probe and moisture film/thin sheet surface also can reflective sound waves, but its sound path can be much smaller compared with weld seam reflection echo sound path, on oscillograph, meeting and initial pulse ripple overlap, and are not just distinguished below to these three kinds of waveforms, and unification is shown with initial pulse wave table.
When lap weld shown in Fig. 5 is detected, oscillograph there will be initial pulse ripple T, 1. echo A1, A2, A3, A4 of 2. 3. 4. Shu Shengbo.Because the sound path of A4 is longer, generally can exceed analyzed scope, so waveform can be as shown in Figure 6.Because 2. 3. sound path is 4. longer than 1., so the reflection echo of weld seam is exactly appear at the obvious sound wave A1 of after initial pulse ripple T first, measure the sound path S1 of A1 and record.In like manner measure S2 and record by another probe of ALT-CH alternate channel.Again according to the distance L between two probes measured in advance, then measure the width of weld seam at this place by above data: W=L+2L0-(S1+S2)/2, (L0 is Front distance length).
Mobile probe 1 and displacement controller 3 move along guide rail 6, then being with B to sweep the reflectoscope of function can according to automatically (0.2 ~ 2mm) excitation at a certain distance and receive ultrasound wave once of the pulse signal of scrambler 2, calculates everywhere molten wide by aforementioned formula.Be horizontal ordinate by molten wide measured value everywhere with scanning distance, just can obtain the molten wide curve of a weld seam, thus the fusion situation of weld seam can be shown at a glance.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (9)
1. the ultrasonic Rapid non-destructive testing device of sheet lap bead weld, is characterized in that, comprises the first probe, the second probe, defectoscope, arithmetic unit, particularly:
First probe is arranged on the left of weld seam, and the second probe is arranged on the right side of weld seam, and first, second probe all has the function of signal transmitting and receiving concurrently, and the line of the acoustic axis axis of first, second probe is perpendicular to weld seam;
Arithmetic unit is popped one's head in first, second pop one's head in, defectoscope is connected;
Defectoscope is popped one's head in first, second pop one's head in be connected and obtain sound path data;
Arithmetic unit comprises weld pool width computing module, data obtaining module, output module, human-computer interaction device, data obtaining module obtains sound path data from defectoscope, and data obtaining module connects human-computer interaction device and obtains distance between first, second probe and the forward position length of probe; Weld pool width computing module connection data obtains module, output module; Data obtaining module, output module all connect human-computer interaction device.
2. the ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld according to claim 1, it is characterized in that, the described data obtaining module distance comprised between two probes obtains the forward position length acquisition module of module, two probe sound path read modules, probe, and the forward position length of the distance acquisition module between two described probes, two probe sound path read modules, probe obtains the equal attachment weld of module and melts wide computing module.
3. the ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld according to claim 1, it is characterized in that, described weld pool width computing module calculates weld pool width: weld pool width W=L+2L0-(S1+S2)/2 according to following relational expression, wherein: the distance between two probes is L; Weld pool width is W; The ultrasound wave that left side probe is launched returns, by the distance of ultrasonic propagation the whole process of left side probe wafer receipt, i.e. left side sound path S1 from launching, propagating, run into weld seam left side wall; In like manner right side sound path is S2; L0 is the forward position length of probe, i.e. the propagation distance of sound wave within the scope of probe.
4. the ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld according to claim 1, is characterized in that, the first described probe, the second probe are angle probe; The model of first, second described probe is identical.
5. the ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld according to claim 1, is characterized in that, described defectoscope is the reflectoscope with B scan function.
6. according to the arbitrary described ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld of claim 1 to 5, it is characterized in that, also be provided with carriage, carriage comprises driving mechanism, guide rail or slideway, the axis direction that carriage supplies the first probe respectively, the second probe is parallel to weld seam slides, driving mechanism comprises displacement controller, and the first probe, the second probe connection bit shift controller, displacement controller drives two probe synchronous slides.
7. the ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld according to claim 6, it is characterized in that, described arithmetic unit also comprises image-forming module, and image-forming module connects oscillograph, demonstrates the molten wide curve along bead direction.
8. the ultrasonic Rapid non-destructive testing device of sheet lap bead weld, it is characterized in that, adopt the angle probe (1) of two same model, the scrambler (2) be connected with pop one's head in (1), control to pop one's head in (1) and the displacement controller (3) of scrambler (2) movement, reflectoscope (4), data processing and image-forming module (5) with B scan function, guide rail (6); The angle probe (1) of two same models is placed on guide rail (6), angle probe (1) has the function of signal transmitting and receiving concurrently, be placed in the both sides of weld seam to be checked respectively, the line of two angle probe (1) acoustic axis axis is perpendicular to weld seam; The accurate spacing and two controlling two probes (1) of displacement controller (3) are popped one's head in and are moved along bead direction; Reflectoscope (4) for excitation and the ultrasonic signal of receiving transducer (1), and shows detection waveform, then detection data is transferred to data processing and image-forming module (5); Data processing and image-forming module (5) receive the data of defectoscope (4) and displacement controller (3) simultaneously, calculate weld pool width and demonstrate the molten wide curve along bead direction.
9. the ultrasonic Rapid non-destructive testing device of a kind of sheet lap bead weld according to claim 8, it is characterized in that, data processing module is provided with in described data processing and image-forming module, calculating the relational expression that weld pool width adopts in data processing module is: weld pool width W=L+2L0-(S1+S2)/2, wherein: the distance between two probes is L; Weld pool width is W; The ultrasound wave that left side probe is launched returns, by the distance of ultrasonic propagation the whole process of left side probe wafer receipt, i.e. left side sound path S1 from launching, propagating, run into weld seam left side wall; In like manner right side sound path is S2; L0 is the forward position length of probe, i.e. the propagation distance of sound wave within the scope of probe; Sound path S1, S2 read from defectoscope (4).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104931582A (en) * | 2015-06-16 | 2015-09-23 | 南车青岛四方机车车辆股份有限公司 | Thin plate overlap joint narrow weld joint ultrasound fast nondestructive testing method and device |
| CN105717199A (en) * | 2016-01-26 | 2016-06-29 | 陆雷俊 | Ultrasonic transverse and longitudinal section element-separating detection method for stainless steel and nickel-based steel weld joint |
| CN106802325A (en) * | 2016-11-28 | 2017-06-06 | 中车齐齐哈尔车辆有限公司 | The test device and detection method of acoustic axis angle of deviation |
| CN108508087A (en) * | 2018-03-14 | 2018-09-07 | 中车青岛四方机车车辆股份有限公司 | Lap weld molten wide detection method, device and system |
| CN113655116A (en) * | 2020-05-12 | 2021-11-16 | 中车唐山机车车辆有限公司 | Auxiliary device for ultrasonic flaw detection and judgment method |
| CN115656325A (en) * | 2022-10-27 | 2023-01-31 | 吉林大学 | Lamb wave based internal weld width detection method and device for lap joint laser welding head |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104931582A (en) * | 2015-06-16 | 2015-09-23 | 南车青岛四方机车车辆股份有限公司 | Thin plate overlap joint narrow weld joint ultrasound fast nondestructive testing method and device |
| CN105717199A (en) * | 2016-01-26 | 2016-06-29 | 陆雷俊 | Ultrasonic transverse and longitudinal section element-separating detection method for stainless steel and nickel-based steel weld joint |
| CN105717199B (en) * | 2016-01-26 | 2018-11-16 | 陆雷俊 | A kind of stainless steel, Ni-based steel the welding line ultrasonic first detection method in face point in length and breadth |
| CN106802325A (en) * | 2016-11-28 | 2017-06-06 | 中车齐齐哈尔车辆有限公司 | The test device and detection method of acoustic axis angle of deviation |
| CN106802325B (en) * | 2016-11-28 | 2019-10-25 | 中车齐齐哈尔车辆有限公司 | The test device and detection method of acoustic axis angle of deviation |
| CN108508087A (en) * | 2018-03-14 | 2018-09-07 | 中车青岛四方机车车辆股份有限公司 | Lap weld molten wide detection method, device and system |
| CN113655116A (en) * | 2020-05-12 | 2021-11-16 | 中车唐山机车车辆有限公司 | Auxiliary device for ultrasonic flaw detection and judgment method |
| CN113655116B (en) * | 2020-05-12 | 2023-10-03 | 中车唐山机车车辆有限公司 | Auxiliary device for ultrasonic flaw detection and judging method |
| CN115656325A (en) * | 2022-10-27 | 2023-01-31 | 吉林大学 | Lamb wave based internal weld width detection method and device for lap joint laser welding head |
| CN115656325B (en) * | 2022-10-27 | 2024-04-30 | 吉林大学 | Lamb wave-based internal melting width detection method and device for lap joint laser welding head |
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