CN103264225A - Laser butt welding process parameter optimization method and device - Google Patents
Laser butt welding process parameter optimization method and device Download PDFInfo
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- CN103264225A CN103264225A CN2013101778843A CN201310177884A CN103264225A CN 103264225 A CN103264225 A CN 103264225A CN 2013101778843 A CN2013101778843 A CN 2013101778843A CN 201310177884 A CN201310177884 A CN 201310177884A CN 103264225 A CN103264225 A CN 103264225A
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Abstract
The invention discloses a laser butt welding process parameter optimization method and device. The method includes: firstly building a corresponding relationship of typical ultrasonic echo characteristics and a corresponding welding joint cross section metallographic structure, performing ultrasonic detection on the surface of a welding test block, obtaining comparative analysis of detected ultrasonic echo characteristics and characteristic waveform library kurtosis coefficients through laser butt welding orthogonal tests, and obtaining optimal laser butt welding technological parameters. The device comprises a welding test device composed of a control device, an Nd:YAG laser generator, a laser beam, a light guide pipe, a totally reflecting mirror, a light spot adjusting device, a butt welding head, a workpiece, a workpiece clamp system, a three-shaft working platform and a welding member ultrasonic detecting device composed of a test table, a welded workpiece to be detected, an ultrasonic fault detector, a probe, coupling liquid and a computer. The laser butt welding process parameter optimization method and device can optimize laser butt welding process parameters rapidly, reduces detection cost, and can be applied to optimization of the laser butt welding process parameters.
Description
Technical field
The present invention relates to field of laser processing, be specifically related to a kind of method and apparatus of laser butt welding process parameter optimizing.
Background technology
Often add alloying element in the fine aluminium, for example: silicon, copper, magnesium, zinc, cadmium, titanium, nickel, strontium, cobalt and rare earth metal etc., make various aluminium alloys, by changing its structure property and structure, make it to become the light metal material of extensive use.Along with aluminium alloy in manufacturing field utilizations more and more widely such as automobile, shipbuilding, national defence, Aero-Space, amusement and sports equipments, the solder technology of light metal also more and more shows its importance.Along with the continuous development of solder technology, the structural change of the material of welding, aluminium alloy shows its superiority more: have good corrosion resistance, electric conductivity, thermal conductivity and high specific strength, thereby applied to welding field widely.
Because the particularity of aluminium alloy range of application makes its tensile strength is required height, and defectives such as crackle, slag inclusion, shrinkage porosite, pore are had strict restriction.To be the laser pulse that utilizes high-energy-density carry out local heat in the tiny area to material to laser weld, and the energy of laser emission forms specific molten bath to reach the purpose of welding by the diffusion inside of heat conduction to material with material fusing back.And because the welding of material is a quick and inhomogeneous thermal cycle process, and all be under the condition that is exceedingly fast, to carry out, if forming technology control is improper, be easy to cause the weldment distortion, in drip molding, form crackle, directly influence welded quality and serviceability.
Ultrasound examination is the highest and development a kind of Dynamic Non-Destruction Measurement faster of the widest frequency of utilization of domestic and international application.It is to produce decay when utilizing ultrasonic wave to propagate in medium that the ultrasonic inspection ripple detects, run into the interface and produce the technology that the character that reflects detects the defective Non-Destructive Testing, be widely used in the aspects such as forging, rolled parts, welded seam and some foundry goods of various sizes at present.Optimize laser butt welding technological parameter cost height in the prior art, efficient is low.
Summary of the invention
The objective of the invention is to provide a kind of laser butt welding parameter optimizing method and device, for laser butt welding process parameter optimizing provides a kind of use effective method, can rapid Optimum laser butt welding technological parameter, reduce and detect cost, the actual theoretical direction that provides of engineering is provided.
In order to solve above technical problem, the technical solution used in the present invention is as follows:
A kind of laser butt welding parameter optimizing method, at first set up the corresponding relation of typical ultrasonic echo feature and corresponding section of weld joint metallographic structure, it is characterized in that: ultrasound examination is carried out on the surface that also is included in the welding test block, obtain ultrasonic echo feature and the signature waveform storehouse coefficient of kurtosis compare of analysis of detection by laser butt welding orthogonal test, obtain optimum laser butt welding technological parameter, concrete steps are as follows:
The welding region of butt welding is wide.
Described laser butt welding technological parameter requires mainly to refer to laser diode voltage, laser defocusing amount and jig translational speed.
Described experience Waveform Analysis Method refers to by to hyperacoustic first time, the second time and the wave amplitude of echo for the third time, and ultrasonic wave is in defective test block propagation characteristic and receive that a sign that the ripple frequency comes down to pad value judges.
A kind of device of realizing described laser butt welding process parameter optimizing method, comprise that the weldment ultrasonic detection device comprises the test bench (12) that links to each other successively, weldment (13), detection system, wherein detection system comprises supersonic detector (15), double-crystal normal probe (16), coupling liquid (14), ultrasonic echo (17), weld seam (18), welding region (19), heat affected area (20) and computer (21), it is characterized in that, also comprise the butt welding experimental rig: control device (1), be installed in the tool holder system (10) on three workbench (11), by the workpiece (9) of tool holder system (10) clamping, and light path system; Described light path system comprises laser generator (2), laser beam (3), light pipe (4), total reflective mirror (5), spot size adjusting device (6), the laser instrument soldering tip (7) that links to each other successively, the relative position of the soldering tip (7) of control device (1) parallel control laser generator (2) and three workbench (11), control workpiece (9) Surface Machining point and laser instrument is namely realized laser butt welding by control device (1) programming and laser technical parameters.
Description of drawings
Fig. 1 is metal coupons laser butt welding test welder;
Fig. 2 is the ultrasonic detection device of metal butt welding test block;
Fig. 3 is that high test block is detected a flaw and the laser butt welding weld joint ultrasonic echo waveform figure that obtains to welding quality;
Fig. 4 detects a flaw and the laser butt welding weld joint ultrasonic echo waveform that obtains to the test block with cooling weld seam;
Fig. 5 is that the serious test block of defective is detected a flaw and the laser butt welding weld joint ultrasonic echo waveform that obtains;
Fig. 6 is the section of weld joint metallograph of no significant defect test block;
Fig. 7 is the section of weld joint metallograph that the open defect test block is arranged;
Fig. 8 is the section of weld joint metallograph of the test block of poor welding quality;
Fig. 9 is the measured weldment ultrasonic echo of laser butt welding matter characteristic pattern;
A is the ultrasonic echo oscillogram that the welding translational speed is respectively 90 mm/min laser butt welding weld seams among Figure 10, and b is that the focusing microscope of the laser butt welding weld seam of correspondence is taken the section of weld joint metallograph;
Among Figure 11, c is the ultrasonic echo oscillogram that the welding translational speed is respectively 100 mm/min laser butt welding weld seams, and d is that the focusing microscope of the laser butt welding weld seam of correspondence is taken the section of weld joint metallograph;
E is the ultrasonic echo oscillogram that the welding translational speed is respectively 110 mm/min laser butt welding weld seams among Figure 12, and f is that the focusing microscope of the laser butt welding weld seam of correspondence is taken the section of weld joint metallograph;
G is the ultrasonic echo oscillogram that the welding translational speed is respectively 120 mm/min laser butt welding weld seams among Figure 13, and h is that the focusing microscope of the laser butt welding weld seam of correspondence is taken the section of weld joint metallograph;
Among Figure 14 among a, Figure 15 among c, Figure 16 among e, Figure 17 g be respectively that laser pulse width is 2 ms, laser frequency is 30 Hz, the positive defocusing amount of laser is 6 mm, and the jig translational speed is corresponding laser butt welding weld joint ultrasonic echo waveform figure when laser diode voltage is respectively 450 V, 460 V, 470 V and 480 V under the 110 mm/min conditions;
Among Figure 14 among b, Figure 15 among d, Figure 16 among f, Figure 17 h be respectively among a among Figure 14, Figure 15 among c, Figure 16 among e, Figure 17 the focusing microscope of the corresponding laser butt welding of g weld seam take the section of weld joint metallograph;
Among Figure 18 among a, Figure 19 among c, Figure 20 among e, Figure 21 g be that laser pulse width is 2 ms, pulse laser frequency is 30 Hz, laser voltage is 460 V, and the welding translational speed is corresponding laser butt welding weld joint ultrasonic echo waveform figure when the positive defocusing amount of laser is respectively 4 mm, 5 mm, 6 mm and 7 mm under the 110 mm/min conditions;
Among Figure 18 among b, Figure 19 among d, Figure 20 among f, Figure 21 h be respectively among a among Figure 18, Figure 19 among c, Figure 20 among e, Figure 21 the focusing microscope of the corresponding laser butt welding of g weld seam take the section of weld joint metallograph.
Among the figure: 1. 11. 3 workbench of control device 2. laser generators 3. laser beams 4. light pipes 5. total reflective mirrors 6. spot size adjusting devices 7. laser instrument soldering tips 8. butt welding zone 9. workpiece, 10. workpiece clamp systems, 12. test platforms, 13. weldments, 14. coupling liquid, 15. supersonic detectors show ultrasonic echo 18. weld seams 19. welding regions 20. heat-affected zones 21. computers in equipment 16. double-crystal normal probes 17. workpiece.
The specific embodiment
Describe details and the working condition of the concrete device of the present invention's proposition in detail below in conjunction with accompanying drawing.
Embodiment one:
The concrete steps of the ultrasonic detection method of laser butt welding weld seam internal flaw are as follows:
(1) according to the parameter request of butt welding workpiece, generates laser butt welding welding condition by control device 1 programming; By laser butt welding initial trial, determine the technological parameter welding parameter scope of laser frequency, laser voltage, laser defocusing amount and the jig translational speed of laser butt welding;
(2) scope that changes according to above-mentioned definite parameter utilizes the parameter of control device 1 control laser instrument 2 and 11 pairs of workpiece of three-shaft linkage workbench to carry out the butt welding test.Butt welding parameter area according to initial stage butt welding test obtains in this scope, carries out orthogonal test by control device 1 control to laser instrument 2 parameters and three-shaft linkage workbench 11, finishes up to welding;
(3) workpiece of butt welding being finished with sand paper (following replace with weldment) surface finish is smooth, and cleans the polishing surface with acetone, to remove foreign material such as oxide-film, dirt, burr;
(4) the ultrasonic examination instrument parameter is set, scan mode, head angle, probe type (monocrystalline or double crystal probe), frequency probe, damping size, sweep limits are set respectively, time delay, pickup mode, pulse pattern etc. are ready to coupling solution; The ultrasonic examination instrument probe is calibrated, and can be obtained the spread speed of ultrasonic wave in weldment; At this moment, with the spread speed of ultrasonic wave in weldment and the thickness of weldment, can calculate ultrasonic wave propagation time in test block;
(5) adopt double-crystal normal probe that test block is detected a flaw, probe is placed on above the test block, utilize supersonic detector that the welding test block is detected a flaw respectively, obtain the ultrasonic wave waveform figure of weldment; Utilize wire cutting method that weldment is cut along cross section, employing standard metallographic specimen preparation section is made sample, adopt OLYMPUS OSL3000 type laser confocal microscope to take section of weld joint metallographic structure figure, set up the corresponding relation of typical ultrasonic echo feature and corresponding section of weld joint metallographic structure then, the experience Waveform Analysis Method of utilization is set up the characteristic feature waveform library of the various form correspondences of weld seam;
(6) weldment to all laser butt welding orthogonal tests carries out the ultrasonic echo detection, obtains ultrasonic echo feature under the different welding conditions, with the echo character comparative analysis in signature waveform storehouse, thus the optimal processing parameter of acquisition butt welding.
Embodiment two:
Be optimized laser butt welding technological parameter device with the present invention and comprise laser butt welding experimental rig and test block ultrasonic detection device, the butt welding experimental rig comprises the control device 1 that links to each other successively, light path system, tool holder system 10, workpiece 9 and three workbench 11, wherein light path system comprises the laser generator 2 that links to each other successively, laser beam 3, light pipe 4, total reflective mirror 5, spot size adjusting device 6, laser instrument soldering tip 7, control device 1 parallel control laser generator 2 and three workbench 11, the relative position of the soldering tip 7 of control workpiece 9 Surface Machining points and laser instrument is namely realized laser butt welding by control device programming 1 and laser technical parameters; The test block ultrasonic detection device comprises test bench 12, weldment 13, the detection system that links to each other successively, and wherein detection system comprises supersonic detector 15, double-crystal normal probe 16, coupling liquid 14, ultrasonic echo 17, weld seam 18, welding region 19, heat affected area 20 and computer 21.Determine proper laser butt welding process parameters range (comprising laser diode voltage, laser defocusing amount and jig translational speed etc.), utilize the control device 1 can parallel control laser generator 2 and three workbench 11, can control the relative position of workpiece 9 Surface Machining points and laser instrument soldering tip 7, namely realize laser butt welding test by control device programming 1 and laser technical parameters.Use the test block ultrasonic wave detecting system that test block 13 is finished in butt welding and detect a flaw, use 16 pairs of test blocks of double-crystal normal probe to scan, use coupling liquid 14 to be coupled between probe and the test block, scanning result shows on supersonic detector display screen 15.
Below be the 7075-T6 aluminium alloy laser butt welding process parameter optimizing example based on the ultrasonic echo feature, at first obtained low powder pulsed Nd:YAG laser butt welding 7075-T6 aluminium alloy process parameters range according to butt welding material behavior test and be: laser diode voltage
=450-480 V, laser pulse width
=2 ms, the welding translational speed
=90-120 mm/min, the positive defocusing amount of laser
=4-7 mm, laser frequency
=30 Hz, by control laser parameter and jig translational speed repeatedly butt welding test is carried out in test block then, utilize supersonic detector that test block is detected a flaw, write down everywhere position and corresponding ultrasonic echo figure, adopt the line cutting to cut perpendicular to weld seam along measuring everywhere, the seam cross-section of acquisition is polished successively with 200#, 500#, 800#, 1200#, 1500# sand paper; With the surface after the acetone cleaning polishing, remove foreign material such as surperficial oxide-film, dirt, burr, according to standard metallographic specimen preparation section butt welded seam cross section with sand papering, polish, inlay, be put in and take the section of weld joint metallograph under the OLYMPUS OSL3000 type laser confocal microscope, set up the corresponding relation of typical ultrasonic echo feature and corresponding section of weld joint metallographic structure then, set up the signature waveform storehouse, and obtained the measured weldment ultrasonic echo of butt welding matter feature; Adopt orthogonal test (relating to laser diode voltage, laser defocusing amount and jig translational speed) that alloy sheets is carried out laser butt welding at last, adopt supersonic detector to obtain the echo character collection of corresponding laser butt welding weld seam simultaneously, and compare with the echo character in signature waveform storehouse, obtained low powder pulsed Nd:YAG laser butt welding 7075-T6 aluminium alloy laser butt welding optimum process parameter and be: 110 mm/min weld translational speed, the positive defocusing amount of 6 mm laser and 460 V laser diode voltages.Obtain optimum laser butt welding technological parameter.
Fig. 3 to Fig. 5 adopts supersonic detector different test blocks to be detected a flaw and the laser butt welding weld joint ultrasonic echo waveform figure that obtains.From the laser butt welding weld seam echo waveform figure of Fig. 3, can find that whole oscillogram is regular, arrange closely, and echo is high-visible several times before hyperacoustic, spacing between adjacent two echoes is identical, each crest width is moderate, all be unimodal, there is not tangible sprig peak, for the first time echo amplitude is also than higher, and for the second time, the crest of the preceding relatively echo of echo reduces gradually for the third time, the reduction amplitude is certain linearity, obtain this test block laser butt welding welding quality height, no significant defect by judgement and the experience echo analysis of utilization to waveform signal.From the laser butt welding weld seam echo waveform figure of Fig. 4, the wave-shape amplitude that can find hyperacoustic first time of echo is very low, Mintrop wave is mild, amplitude is little, the echo ratio echo first time is taller for the second time for ultrasonic wave, and waveform is polyline shaped, the end is thinner, shows this test block because cooling weld seam bigger than normal by residual stress and that the metal inside tissue causes partially firmly.From the laser butt welding weld seam echo waveform figure of Fig. 5, can find hyperacoustic first time, for the second time, the wave-shape amplitude of echo is very low for the third time, Mintrop wave is mild, amplitude is little, postpone backward, after echo for the third time, occurred echo detect less than phenomenon, this shows that ultrasonic wave has run into bigger defective in test block is propagated, scattering clearly occurred.Ultrasonic wave is the mechanical wave with multiple frequency content, in defect test block in the communication process, hyperacoustic attenuation degree difference of different frequency composition, relatively the low frequency part decay is serious for its HFS, thereby the dominant frequency that receives ripple is drifted about to low frequency end, and its drift amplitude is relevant with the defect level of test block.So, receive the sign that the ripple frequency comes down to pad value.But the degree of the drift situation analysis auxiliary judgment defective by dominant frequency, dominant frequency is lower, and the defective of test block is more serious.
Fig. 6 to Fig. 8 is the section of weld joint metallograph of different test blocks, and they distinguish the focusing microscope of the laser butt welding weld seam of corresponding diagram 3 to Fig. 5 and take the section of weld joint metallograph.From the laser confocal microscope shooting section of weld joint metallograph of Fig. 6, can find that test block tissue topography is smooth, there is not obvious defects, the zone of weld zone, heat affected area and matrix shows clearly, transition is very even, it is more even to be heated during this explanation test specimen laser butt welding, draw thus: corresponding laser butt welding test block welding quality height, no obvious defects.Take the section of weld joint metallograph from the laser confocal microscope of Fig. 7 and can find crackle to have occurred in the laser weld district, this be since in the laser beam welding inhomogeneous the causing of being heated of test specimen produce; And the demonstration of laser weld heat affected area is not obvious, and the zone of weld zone and heat affected area is distinguished not obvious, and the tissue topography at whole welding line interface shows smooth inadequately.Draw thus: corresponding laser butt welding test block welding quality is not high, and obvious defects is arranged.Take from the laser confocal microscope of Fig. 8 and can find the section of weld joint metallograph that section of weld joint that laser butt welding forms has many wide and deep torn grain and shrinkage cavities.Laser butt welding weld zone and heat affected area are distinguished not obvious, and whole welding region is more random.Draw thus: corresponding laser butt welding test block poor welding quality has obvious defects.
Fig. 9 is the measured weldment ultrasonic echo of laser butt welding matter characteristic pattern.It is regular to it is characterized by whole oscillogram, arrange closely, and echo is high-visible several times before hyperacoustic, spacing between adjacent two echoes is identical, and each crest width is moderate, all is unimodal, there is not tangible sprig peak, for the first time echo amplitude is also than higher, and for the second time, the crest of the preceding relatively echo of echo reduces gradually for the third time, the reduction amplitude is certain linearity.
Figure 10 to Figure 13 is ultrasonic wave waveform figure and the section of weld joint metallograph of the weld seam internal flaw under the different welding of the 7075-T6 aluminium alloy laser butt welding translational speed.Among Figure 10 among a, Figure 11 among c, Figure 12 among e, Figure 13 g be that laser pulse width is 2 ms, pulse laser frequency is 30 Hz, the positive defocusing amount of laser is 6 mm, voltage is under the 460 V conditions, the ultrasonic echo oscillogram of corresponding laser butt welding weld seam when the welding translational speed is respectively 90 mm/min, 100 mm/min, 110 mm/min, 120 mm/min; Among Figure 10 among b, Figure 11 among d, Figure 12 among f, Figure 13 h be among a among Figure 10, Figure 11 among c, Figure 12 among e, Figure 13 the focusing microscope of the corresponding laser butt welding of g weld seam take the section of weld joint metallograph.Can draw in the positive defocusing amount of laser by the signature waveform storehouse is 6 mm, and laser pulse width is 2 ms, and pulse laser frequency is 30 Hz, and laser diode voltage is 460 V when remaining unchanged, when the welding translational speed is 110 mm/min, and corresponding laser butt welding quality height.
Figure 14 to Figure 17 is ultrasonic wave waveform figure and the section of weld joint metallograph of the weld seam internal flaw under the 7075-T6 aluminium alloy laser butt welding various lasers voltage; Among Figure 14 among a, Figure 15 among c, Figure 16 among e, Figure 17 g be respectively that laser pulse width is 2 ms, laser frequency is 30 Hz, the positive defocusing amount of laser is 6 mm, and the jig translational speed is corresponding laser butt welding weld joint ultrasonic echo waveform figure when laser diode voltage is respectively 450 V, 460 V, 470 V and 480 V under the 110 mm/min conditions; Among Figure 14 among b, Figure 15 among d, Figure 16 among f, Figure 17 h be respectively among a among Figure 14, Figure 15 among c, Figure 16 among e, Figure 17 the focusing microscope of the corresponding laser butt welding of g weld seam take the section of weld joint metallograph.Can draw at laser pulse width by waveform characterization libraries is 2 ms, and the positive defocusing amount of laser is 6 mm, and pulse laser frequency is 30 Hz, and the translational speed of welding is 110 mm/min when remaining unchanged, when laser diode voltage is 460 V, and corresponding laser butt welding quality height.
Figure 18 to Figure 21 is ultrasonic wave waveform figure and the section of weld joint metallograph of the weld seam internal flaw under the different laser defocusing amounts of 7075-T6 aluminium alloy laser butt welding.Among Figure 18 among a, Figure 19 among c, Figure 20 among e, Figure 21 g be that laser pulse width is 2 ms, pulse laser frequency is 30 Hz, laser voltage is 460 V, and the welding translational speed is corresponding laser butt welding weld joint ultrasonic echo waveform figure when the positive defocusing amount of laser is respectively 4 mm, 5 mm, 6 mm and 7 mm under the 110 mm/min conditions; Among Figure 18 among b, Figure 19 among d, Figure 20 among f, Figure 21 h be respectively among a among Figure 18, Figure 19 among c, Figure 20 among e, Figure 21 the focusing microscope of the corresponding laser butt welding of g weld seam take the section of weld joint metallograph.Can draw at laser diode voltage by waveform characterization libraries is 460 V, and laser pulse width is 2 ms, and pulse laser frequency is 30 Hz, and the translational speed of welding is 110 mm/min when remaining unchanged, when the positive defocusing amount of laser is 6 mm, and corresponding laser butt welding quality height.
Claims (5)
1. laser butt welding parameter optimizing method, at first set up the corresponding relation of typical ultrasonic echo feature and corresponding section of weld joint metallographic structure, it is characterized in that: ultrasound examination is carried out on the surface that also is included in the welding test block, obtain ultrasonic echo feature and the signature waveform storehouse coefficient of kurtosis compare of analysis of detection by laser butt welding orthogonal test, obtain optimum laser butt welding technological parameter, concrete steps are as follows:
Step 1 according to the parameter request of butt welding workpiece, generates laser butt welding welding condition by control device (1) programming; By laser butt welding initial trial, determine the technological parameter welding parameter scope of laser frequency, laser voltage, laser defocusing amount and the jig translational speed of laser butt welding;
Step 2 according to the scope that above-mentioned definite parameter changes, utilizes the parameter of control device (1) control laser instrument (2) and three-shaft linkage workbench (11) that workpiece is carried out the butt welding test;
Butt welding parameter area according to initial stage butt welding test obtains in this scope, carries out orthogonal test by control device (1) control to laser instrument (2) parameter and three-shaft linkage workbench (11), finishes up to welding;
Step 3, the workpiece of butt welding being finished with sand paper (following replace with weldment) surface finish is smooth, and cleans the polishing surface with acetone, to remove foreign material such as oxide-film, dirt, burr;
Step 4, the ultrasonic examination instrument parameter is set, scan mode, head angle, probe type (monocrystalline or double crystal probe), frequency probe, damping size, sweep limits are set respectively, and time delay, pickup mode, pulse pattern etc. are ready to coupling solution; The ultrasonic examination instrument probe is calibrated, and can be obtained the spread speed of ultrasonic wave in weldment; At this moment, with the spread speed of ultrasonic wave in weldment and the thickness of weldment, can calculate ultrasonic wave propagation time in test block;
Step 5 adopts double-crystal normal probe that test block is detected a flaw, and probe is placed on above the test block, utilizes supersonic detector that the welding test block is detected a flaw respectively, obtains the ultrasonic wave waveform figure of weldment; Utilize wire cutting method that weldment is cut along cross section, employing standard metallographic specimen preparation section is made sample, adopt laser confocal microscope to take section of weld joint metallographic structure figure, set up the corresponding relation of typical ultrasonic echo feature and corresponding section of weld joint metallographic structure then, the experience Waveform Analysis Method of utilization is set up the characteristic feature waveform library of the various form correspondences of weld seam;
Step 6 is carried out ultrasonic echo to the weldment of all laser butt welding orthogonal tests and is detected, and obtains ultrasonic echo feature under the different welding conditions, with the echo character comparative analysis in signature waveform storehouse, thereby obtains the optimal processing parameter of butt welding.
2. laser butt welding parameter optimizing method as claimed in claim 1, it is characterized in that: the welding region of butt welding is wide.
3. laser butt welding parameter optimizing method as claimed in claim 1 is characterized in that: described laser butt welding technological parameter requires mainly to refer to laser diode voltage, laser defocusing amount and jig translational speed.
4. laser butt welding parameter optimizing method as claimed in claim 1, it is characterized in that: described experience Waveform Analysis Method refers to by to hyperacoustic first time, the second time and the wave amplitude of echo for the third time, and ultrasonic wave is in defective test block propagation characteristic and receive that a sign that the ripple frequency comes down to pad value judges.
5. device of implementing the described laser butt welding of claim 1 process parameter optimizing method, comprise that the weldment ultrasonic detection device comprises the test bench (12) that links to each other successively, weldment (13), detection system, wherein detection system comprises supersonic detector (15), double-crystal normal probe (16), coupling liquid (14), ultrasonic echo (17), weld seam (18), welding region (19), heat affected area (20) and computer (21), it is characterized in that, also comprise the butt welding experimental rig: control device (1), be installed in the tool holder system (10) on three workbench (11), by the workpiece (9) of tool holder system (10) clamping, and light path system; Described light path system comprises laser generator (2), laser beam (3), light pipe (4), total reflective mirror (5), spot size adjusting device (6), the laser instrument soldering tip (7) that links to each other successively, the relative position of the soldering tip (7) of control device (1) parallel control laser generator (2) and three workbench (11), control workpiece (9) Surface Machining point and laser instrument is namely realized laser butt welding by control device (1) programming and laser technical parameters.
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| CN110640316B (en) * | 2019-09-03 | 2021-05-21 | 温州大学 | Double-beam laser welding optimization method |
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