CN102161134A - Hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser - Google Patents
Hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser Download PDFInfo
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- CN102161134A CN102161134A CN2009103107211A CN200910310721A CN102161134A CN 102161134 A CN102161134 A CN 102161134A CN 2009103107211 A CN2009103107211 A CN 2009103107211A CN 200910310721 A CN200910310721 A CN 200910310721A CN 102161134 A CN102161134 A CN 102161134A
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Abstract
The invention relates to a hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser, comprising the following steps: firstly fixing a variable-polarity square-wave tungsten electrode argon arc welding gun and a laser beam transmitting gun, providing a workpiece moving at a constant speed, forming a mode of preposing the variable-polarity square-wave tungsten electrode argon arc welding gun, utilizing the electric arc of variable-polarity square-wave tungsten electrode argon arc welding to remove impurities such as oxide films and the like at the surface zone of the welding workpiece, and leading the workpiece to be in a high-temperature melting state; and then leading laser beams to radiate a welded part, thus deepening the depth of fusion in variable-polarity square-wave tungsten electrode argon arc welding and finishing the welding. By utilizing the welding method adopted by the invention, the reflectivity of metal to the laser can be reduced, and the absorptivity of the metal to the laser energy is improved, so that the effective heating depth of the laser is improved, the depth of fusion of welding seams is enlarged, and the width of the welding seams and the width of heat affected zones are effectively reduced, thus finally a welding piece with deeper depth of fusion, very small heat affected zones and attractive appearance can be obtained.
Description
Technical field
The present invention relates to sheet metal or the butt-welded methods of section bar such as a kind of aluminium alloy, specifically a kind of by using two kinds of thermals source of Variable Polarity Square-wave AC tungsten argon arc and laser that sheet metals such as aluminium alloy or section bar are carried out butt-welded method simultaneously, belong to the metal welding techniques field.
Background technology
Aluminium alloy has that density is little, plasticity good, is easy to machine-shaping, no black brittleness changes and many advantages such as atmospheric corrosion resistance, the structural material that is widely used in Aeronautics and Astronautics, high-speed track train or other delivery vehicle, yet, because distinctive physics of aluminum alloy materials and chemical characteristic have determined the weldability that it is unique.
The TIG welding requirements of aluminium alloy should be brought into play the oxide-film that cleaning action of the cathode is removed surface compact, reduces the tungsten electrode scaling loss again, keeps tungsten electrode termination shape.Particularly in automatic welding, the TIG welding system of the low tungsten electrode scaling loss of high cleaning becomes people's expectation.Along this thinking, aluminum alloy TIG welding method has experienced the direct current tungsten electrode and has connect that negative (DCEN), direct current tungsten electrode are just connecing (DCEP), sine wave AC, square wave alternating-current develops into Variable Polarity Square-wave AC TIG welding.
The core devices of Variable Polarity Square-wave AC TIG welding is exactly the Variable Polarity power supply, its output waveform as shown in Figure 1, among Fig. 1, I
NBe straight polarity direct current half-wave current amplitude, t
nBe straight polarity direct current hemiwave time, I
pBe dc reverse connection half-wave current amplitude, t
pBe the dc reverse connection hemiwave time, also comprise welding gun, air supply plant etc. in addition.The Variable Polarity power supply is as a kind of novel source of welding current that grew up in nearly ten years, inherited the advantage of square wave power, the Variable Polarity power supply is that a kind of thing goes out the square wave alternating-current power supply that supply frequency and positive and negative half-wave (DCEP and DCEN) current amplitude, time ratio can be distinguished independent regulation, can select optimum range by different materials, different weldment shape; Its output current is an ac square wave, and direct current output is precise and stable, and the crest pulsation rate is less than 0.5%, and the current settings value drift is less than 1%; Power IG-BT module has been adopted in power transfer control, the current over-zero conversion is exceedingly fast, the electric arc quite stable, time and the increase DCEP half-wave current amplitude of Variable Polarity power supply by further reducing DCEP, and the control loop signal frequency is greater than 10KHZ, response current instruction fast, square wave rising and fall time are less than 1 μ s, there are not excess or deficiency when rising to peak value, can guarantee under the enough cathode cleaning district conditions of acquisition, reducing tungsten electrode to greatest extent is the positive time, and it is close to make the characteristics of electric arc meet negative (DECN) to the direct current tungsten electrode, can reduce the scaling loss of tungsten electrode to greatest extent; Consider computer control during the design of Variable Polarity power supply, pulse rather than high frequency are adopted in the starting the arc, can effectively stop the Electromagnetic Interference on the holding wire, the Variable Polarity power supply also is that its pulsed arc of a kind of pulse power has very strong stirring action to the molten bath, thereby can reduce and suppress air holes.
Though the Variable Polarity Square-wave AC tungsten argon arc is welded in welding aluminum alloy and puts face plurality of advantages is arranged, but as single welding heat source, even welding arc is very concentrated, thickness for weldment also has requirement, and welding efficiency is not high especially, at the pluses and minuses of present laser weld aluminium alloy, can combine Variable Polarity Square-wave AC argon tungsten-arc welding and method for laser welding, realize both pluses and minuses complementations.Because be widely used for many years for laser welding technology, be mainly used in the various metal materials of welding, aluminium alloy for example, stainless steel or the like, general laser welding apparatus, comprise a solid-state or gas laser oscillator that produces intrinsic monochromatic high-energy light beam guiding, one has light path of being partial to mirror or the optical fiber that allows laser beam is transferred to the soldering tip that is positioned at sheet material to be welded opposite, comprise lens or one or more focusing mirror in the soldering tip, so that laser beam is focused on the material to be welded, joint at material to be welded forms one or more focuses, thereby remove to melt material to be welded in the enough power densities of concentration of local, usually, soldering tip comprises that also one is used for by means of supplying with welding gas with the exhaust nozzle of laser beam coaxial arrangement, the feeder that also claims assist gas, this feeder also can be arranged on the outside of laser welding head.
Yet for welding aluminum alloy sheet or section bar, laser welding process has its inherent characteristics.Advantage such as fusion penetration was big when Laser Welding had power density height, equal hot input quantity, the heat affected area is narrow, welding deformation is little, speed of welding is fast and easily be automated, because Laser Welding can concentrate on thermal source in the very little size, so Laser Welding can accurately be welded the little part of drawing-down, thereby can carry out deep penetration welding, in welding is produced, have very big application potential.But when utilizing the LASER BEAM WELDING aluminium alloy, because aluminium is to characteristics such as reflectivity height, the heat conduction of laser are fast, often need to adopt more powerful laser instrument to weld, cause welding cost too high, and when the Laser Welding aluminium alloy thick plate, weld defect such as also be prone to poor stability, pore, crackle, stay.In addition, because the laser beam focus spot size of laser weld is very little, so need workpiece to be welded to have high position precision, machining accuracy and the equipment precision to welding point all has higher requirement simultaneously.
Summary of the invention
Main purpose of the present invention is to address the above problem and is not enough, a kind of Variable Polarity Square-wave AC tungsten argon arc and laser complex welding method are provided, can increase substantially the absorptivity of aluminum alloy materials to laser, the generation weld penetration is big, the heat affected area is little, the metal weldment of good looking appearance, can effectively improve welding quality and welding efficiency when welding aluminum alloy sheet and section bar.
For achieving the above object, technical scheme of the present invention is:
A kind of Variable Polarity Square-wave AC tungsten argon arc and laser complex welding method, this method comprises the steps:
(1) Variable Polarity Square-wave AC tungsten electrode rifle and laser beam ejecting gun are fixed, wherein Variable Polarity Square-wave AC tungsten argon arc rifle is preceding, the laser beam ejecting gun after, the part that workpiece to be welded need dock is docked, wherein, Variable Polarity Square-wave AC tungsten argon arc rifle should be directly over position to be welded, and the focus of laser beam is in the centre of workpiece welding portion to be welded;
(2) move workpiece to be welded continuously, the welding position that uses Variable Polarity Square-wave AC tungsten argon arc rifle to treat welding work pieces carries out cathode cleaning and initial fusing, makes the welding portion surface be in high temperature fused state;
(3) make laser beam shine described welding portion subsequently, thereby deepen the fusion penetration of Variable Polarity Square-wave AC tungsten argon arc melting welding, finish welding.
Wherein but the tungsten electrode of Variable Polarity Square-wave AC tungsten argon arc is a positive half-wave electric current independent regulation for negative and tungsten electrode, and adjustable range is 5～300A.
Wherein the defocusing amount of laser beam is-2 to-3mm.
Wherein the tungsten electrode center of Variable Polarity Square-wave AC argon tungsten-arc welding and the spacing between the laser beam center are 1 to 3mm.
Described Variable Polarity Square-wave AC tungsten electrode rifle and laser beam ejecting gun are fixed on the screw rod, weld by the distance of regulating between Variable Polarity Square-wave AC tungsten electrode center and the laser beam center.
The welding portion of wherein said workpiece to be welded has 0.1mm or littler butt joint space.
The electric arc direction that described Variable Polarity Square-wave AC tungsten electrode is emitted and the direction of illumination of laser beam be parallel to each other and the vertical welding portion that acts on workpiece to be welded on.
Described workpiece material to be welded is one or both in aluminium alloy, magnesium alloy, copper alloy, titanium alloy and the low-alloy steel.
The cross section of described workpiece welding portion to be welded forms I shape or Y shape groove toward each other, and the angle of described Y shape groove should be less than or equal to 10 °.
Content to sum up, Variable Polarity Square-wave AC tungsten argon arc provided by the present invention and laser complex welding method adopt workpiece to be welded to move and the fixing mode of Variable Polarity Square-wave AC tungsten argon arc and laser beam, carry out the welding of sheet metal such as aluminium alloy or section bar.Variable Polarity Square-wave AC tungsten argon arc rifle and laser beam ejecting gun are fixed on the screw rod, can regulate the distance between laser beam center and the Variable Polarity Square-wave AC tungsten argon arc center as required arbitrarily, guarantee that welding quality reaches best.
Among the present invention, the direction of weldment along the Variable Polarity Square-wave AC tungsten argon arc to laser beam moves, and forms the preposition mode of Variable Polarity Square-wave AC tungsten argon arc.When the welding beginning, Variable Polarity Square-wave AC tungsten argon arc thermal source at first heats metal materials such as aluminium alloy, because the Variable Polarity pulse can the ratio of anticathode half-wave current be carried out full adjustment in welding interval, to obtain satisfied negative electrode fragmentation and suitable electric arc penetration power; And the negative polarity half-wave duty cycle is controlled by program, also can use to be installed in that slide switch manually welds on the welding torch; Inverted pulse DCEP produced oxide and the pollutant that the negative electrode fragmentation can effectively be removed welding pool the place ahead when therefore, Variable Polarity TIG welded; Simultaneously prevent the scaling loss of tungsten electrode again and brought the weld defect of tungsten inclusion, and the electron stream impinge anode of high speed is a weldment in anodal half-wave current, thereby producing fusion penetration makes the face of weld floor district of welding point be in high temperature fused state, at this moment workpiece to be welded begins to move and open laser beam, because face of weld is in high temperature fused state, reduced the reflectivity of metal pair laser, improved the absorptivity of metal pair laser energy, thereby improved effective heat penetration of laser, strengthen weld penetration, effectively reduce weld width and heat affected area width, it is darker to obtain fusion penetration at last, and the heat affected area is especially little, the weldment of good looking appearance simultaneously, has reduced the machining accuracy of welding point and the requirement of equipping aspects such as precision, improve welding quality and welding efficiency, made Variable Polarity Square-wave AC tungsten argon arc and laser beam produce the effect of 1+1＞2.
Because mainly to act on be the pollutant of removing aluminum alloy material surface, oxide-film etc. to the positive polarity half-wave of Variable Polarity Square-wave AC tungsten argon arc in this welding method, preheating metal materials such as aluminium alloy in the negative polarity half-wave makes the weld seam rim surface zona of its welding point be in high temperature fused state, reduce the laser reflection, increase laser absorption rate, improve effective utilization of laser energy, and guarantee that the fusion area is not excessive, guarantee that the heat affected area is in the minimum scope; It is fast simultaneously can also to satisfy speed of welding, is out of shape the little requirement of Denging; And Variable Polarity Square-wave AC tungsten electrode self out-put supply DCEN, DCEP hemiwave time, amplitude are independent adjustable, can realize the oxide-film of cleaning action of the cathode removal surface compact, can reduce the tungsten electrode scaling loss again, keep tungsten electrode termination shape, make the welding arc deflection good, concentration of energy has characteristics such as speed of welding is fast, weld seam is narrow, the heat affected area is little, welding deformation is little and satisfies above-mentioned requirements just, and Variable Polarity Square-wave AC tungsten argon arc and laser composite methods are welded the weak point that has just in time remedied both.In addition, adopt welding method of the present invention, when metal materials such as welding aluminum alloy, need not clear up in advance, and the Variable Polarity current over-zero does not have the supper-fast conversion of Dead Time, the current polarity conversion frequency reaches more than the kHz, can produce special role to the electric arc welding process of aluminium alloy, obviously improve the arc welding quality of aluminium alloy.
This soldering method also is applicable to the butt joint weld job of multiple materials such as aluminium alloy, magnesium alloy, copper alloy, titanium alloy, low-alloy steel simultaneously.
Description of drawings
Fig. 1 structural representation of the present invention.
As shown in Figure 1, workpiece 1 to be welded, Variable Polarity Square-wave AC tungsten electrode rifle 2, Laser emission rifle 3.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described in further detail:
As shown in Figure 2, complex welding method of the present invention, adopt Variable Polarity Square-wave AC tungsten argon arc and laser composite heat power supply to carry out the butt joint welding of sheet metal such as aluminium alloy or section bar, sheet metal or section bar can be one or both materials in aluminium alloy, magnesium alloy, copper alloy, titanium alloy, the low-alloy steel, present embodiment is that example is elaborated with the butt welding of welding two aluminum alloy plate materials, and wherein, the thickness of aluminum alloy plate materials is 8mm, width is 200mm, length 1000mm.
Variable Polarity Square-wave AC tungsten electrode gun electrode is Φ 2.4mm WC20, electrode tip and surface of the work are apart from 3mm, nozzle diameter 6.0mm, tungsten electrode stem elongation are 6.0mm, important technological parameters: wherein the forward and reverse current amplitude of Variable Polarity Square-wave AC tungsten argon arc is respectively 80A and 120A; High-frequency pulse current amplitude 80A; High-frequency impulse frequency 20kHz; Dutycycle 50%; Current polarity conversion frequency 500Hz; The forward and reverse ON time ratio of electric current is 4: 1, and protective gas is a high-purity argon gas.
Laser welder adopts HL2006D type Nd:YAG continuous wave laser; wavelength is that 1.06 microns, laser are output as 0-2000W (mean power); single pulse energy is that 0-200J, impulse waveform can be set arbitrarily, the 0.6mm Optical Fiber Transmission; the condenser lens focal length is 200mm; focus diameter is 0.6mm, and protective gas is a high-purity argon gas.
This complex welding method comprises the steps:
The first step: Variable Polarity Square-wave AC tungsten electrode rifle 2 and laser beam ejecting gun 3 kept at a certain distance away fix on the screw rod (not shown), as shown in Figure 1, the moving direction of workpiece 1 to be welded relatively, Variable Polarity Square-wave AC tungsten electrode rifle 2 is fixed on the front, laser beam ejecting gun 3 is fixed on the back, just can regulate distance between Variable Polarity Square-wave AC tungsten electrode rifle 2 and the laser beam ejecting gun 3 by the screw on the sliding screw.
As shown in Figure 1, in this welding method, the horizontal range that guarantees the center of Variable Polarity Square-wave AC tungsten electrode rifle 2 and laser beam foucing 5 is 1 to 3mm, for welding the thick aluminum alloy plate materials of above-mentioned 8mm, the center of Variable Polarity Square-wave AC tungsten electrode rifle 2 and the horizontal range of laser beam foucing 5 are elected 2.0mm as, this the distance can guarantee Variable Polarity Square-wave AC tungsten argon arc thermal source finish negative electrode put in order with the anode incipient melting after, carry out the welding of laser beam again, with the assurance welding quality.If the hypotelorism at two centers, can cause Variable Polarity Square-wave AC tungsten argon arc thermal source cathode cleaning insufficient, residues such as oxide fail to remove fully, and in the time of can occurring not waiting workpiece 1 surface to be in high temperature fused state, laser beam has just acted on the weldment surface, can influence the absorptivity of workpiece 1 surface to laser; If the distance at two centers is excessive, can not obtain compound effect, and be in the face of weld of high temperature fused state can be contaminated, the result has carried out secondary welding, thereby influences welding quality and welding efficiency.
The pre-heat effect of Variable Polarity Square-wave AC tungsten argon arc can improve thermal source efficient, the negative electrode scavenging action of argon arc welding has been removed and has been influenced some of welding quality impurity on the one hand, oxide-film, greasy dirt etc., the effect of anode incipient melting has improved the absorption of metal pair laser to the preheating of surface of the work on the other hand, meanwhile, because tungsten electrode is a Variable Polarity, make the acceleration direction of electronics and metal ion produce cyclically-varying, can play the isoionic effect of dissipating, thereby the transmissivity of laser is further strengthened, the laser energy conversion ratio is increased, so the intensity of spectral lines of weld zone strengthen; On the other hand, the metal vapors that laser produces only needs less accelerating potential can obtain satisfied cleaning action of the cathode for the cathode cleaning process provides the metal ion on high-speed impact weldment surface, and the electric arc arc column is shunk, and arc stiffness improves.
To have the position butt joint of two workpiece 1 butt joints to be welded of certain width and thickness, and make the focus at Variable Polarity Square-wave AC tungsten electrode center and laser beam center just in time drop on the centre of workpiece 1 weld seam to be welded.
The cross section of the welding portion of workpiece 1 to be welded forms I shape or Y shape groove toward each other, as shown in Figure 1, formation be I shape groove, and in I shape groove, have about 0.1mm or littler butt joint space.
Shape and gauge according to aluminum alloy plate materials also may form Y shape groove, the angle of Y shape groove should be less than or equal to 10 °, be because the cathode protection size that forms in the cathode cleaning process is smaller, if angle is too big, as traditional 50-70 ° angle, cathode protection is not enough to cover the weldment on both sides, and cathode cleaning is not thorough; Simultaneously, because need not fill silk in this welding method, if angle too conference causes the postwelding weld seam recessed, perhaps need to increase the filling metal, this will certainly increase the heat affected area width, property of welded joint and welding efficiency are descended, and the advantage of Variable Polarity Square-wave AC tungsten electrode can not be given full play to, so angle is unsuitable excessive.But angle is too little, as is lower than 5 °, in the process of weldment, can increase workload, and angle is too little wayward, so, the welding manner of preferred I shape groove.
Second step: move workpiece 1 to be welded continuously with a constant speed, the direction of the moving direction of workpiece 1 to be welded shown in arrow among Fig. 1, opposite with the permanent order of Variable Polarity Square-wave AC tungsten electrode rifle 2 and laser beam ejecting gun 3, form the preposition mode of Variable Polarity Square-wave AC tungsten argon arc, treat welding work pieces 1 by Variable Polarity Square-wave AC tungsten electrode rifle 2 and laser beam ejecting gun 3 along bonding wire and carry out composite welding.Because have only workpiece 1 to move,, can select different workpiece 1 translational speed and speed of welding according to the characteristic of different materials and dimensional thickness etc. so the translational speed of workpiece 1 has just determined speed of welding.Speed of welding is a selection principle with the through welding workpiece, as when welding the thick aluminum alloy plate materials of above-mentioned 8mm, speed of welding is selected 20mm/s for use.
After workpiece 1 to be welded begins to move, at first the Variable Polarity Square-wave AC tungsten argon arc is acted on the surface of Al alloy parts 1 butted part, make the foreign material such as face of weld zone oxide-film of workpiece 1 welding portion remove and make it to be in high temperature fused state.Owing to DCEN, DCEP hemiwave time, the half-wave current of Variable Polarity Square-wave AC argon tungsten-arc welding are independent adjustable, so concrete numerical value according to workpiece 1 properties of materials with size and different, as long as under the situation that the assurance cleaning action of the cathode is finished smoothly, reduce the dc reverse connection hemiwave time, this can be realized by strengthening the dc reverse connection half-wave current as far as possible; So reasonable distribution the energy of Variable Polarity power supply, make most of energy come preheating aluminium alloy weldment, to obtain satisfied molten bath, improve the absorption efficiency of aluminium alloy to laser, given full play to the advantage of laser weld, make tungsten electrode obtain minimum damage again and burn.In present embodiment, the thick aluminum alloy plate materials of above-mentioned 8mm then selects forward and reverse current amplitude to be respectively 80A and 120A generally speaking, and the forward and reverse ON time ratio of electric current is 4: 1.
The 3rd step: workpiece 1 to be welded uses high-octane laser beam to shine the welding portion that has been heated by the Variable Polarity Square-wave AC tungsten argon arc after beginning to move, and welds, until finally finishing welding.
Because face of weld is in high temperature fused state, has reduced the reflectivity of aluminum alloy plate materials to laser, has improved the absorptivity of aluminum alloy plate materials to laser energy, thereby has improved effective heat penetration of laser, has strengthened weld penetration.
In this welding method, because the surface that the Variable Polarity Square-wave AC tungsten argon arc has at first heated workpiece 1, and make surface of the work produce certain thickness fusion penetration, for better increasing fusion penetration, so the gonglion of laser beam can drop on workpiece 1 lower face 2-3mm place, like this, not only can effectively reduce weld width and heat affected area width, weld seam after the welding no longer needs operations such as polishing, can directly obtain the weldment of good looking appearance, increase substantially welding quality, but also can save labour turnover and material cost, improve the utilization rate and the welding efficiency of laser.In present embodiment, the thick aluminum alloy plate materials of above-mentioned 8mm adopts parameters such as above-mentioned speed of welding and welding current, can guarantee the weld seam through welding.
In welding method of the present invention, the incidence angle of the ejaculation direction of Variable Polarity Square-wave AC tungsten argon arc rifle 2 and laser beam ejecting gun 3 has bigger influence to welding quality, when there is incidence angle in Variable Polarity Square-wave AC tungsten electrode rifle 2, the spot size of cathode cleaning and cleaning effect can change with the variation of incidence angle, and the deep-seated in the molten bath that welding point has melted is put with width position and can be changed with the different of incidence angle, tungsten electrode also must be made corresponding adjustment from the distance on the surface of weldment like this, control accuracy is reduced and the control system complexity, welding quality and efficient are had bigger influence.If also there are angle in the incidence angle and the welding point of the ejaculation direction of laser beam ejecting gun 3, the drop point of laser beam foucing position and the degree of depth more are difficult to intuitive judgment so, make on-the-spot welding operation difficulty, the quality control complexity, for welding parameter determine to become very difficult, to the welding quality control influence bigger.Therefore, the ejaculation direction of Variable Polarity Square-wave AC tungsten electrode rifle 2 of the present invention and laser beam ejecting gun 3 is parallel to each other and vertical acting on the workpiece 1 to be welded.Variable Polarity Square-wave AC tungsten electrode rifle 2 is during perpendicular to mother metal, and the width position of welding pool can intuitively show, and its distance apart from Variable Polarity Square-wave AC tungsten electrode rifle 2 centers is very easy to measure and obtains.And for the Variable Polarity Square-wave AC argon tungsten-arc welding of vertical incidence, the deep-seated of its weld seam is put consistent with the width position of weld seam, and cleaning action of the cathode best results at this moment.Therefore, be convenient to very much determine the position of laser welding gun.The focus of laser should be positioned on the innermost straight line of weld seam center motlten metal, at following 2-3mm place, surface, at this moment, absorption and increase welding penetration for laser are the most favourable, the ejaculation direction and the face of weld of laser beam ejecting gun are the most straight, the drop point of its focal position is convenient to intuitive judgment, makes on-the-spot welding operation simple, and quality control is easy.
As mentioned above, given in conjunction with the accompanying drawings and embodiments scheme content can derive the similar techniques scheme.In every case be the content that does not break away from technical solution of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical solution of the present invention according to technical spirit of the present invention.
Claims (10)
1. Variable Polarity Square-wave AC tungsten argon arc and laser complex welding method is characterized in that: this method comprises,
(1) Variable Polarity Square-wave AC tungsten electrode rifle and laser beam ejecting gun are fixed, wherein Variable Polarity Square-wave AC tungsten argon arc rifle is preceding, the laser beam ejecting gun after, the part that workpiece to be welded need dock is docked, wherein, Variable Polarity Square-wave AC tungsten argon arc rifle should be directly over position to be welded, and the focus of laser beam is in the centre of workpiece welding portion to be welded;
(2) move workpiece to be welded continuously, the welding position that uses Variable Polarity Square-wave AC tungsten argon arc rifle to treat welding work pieces carries out cathode cleaning and initial fusing, makes the welding portion surface be in high temperature fused state;
(3) make laser beam shine described welding portion subsequently, thereby deepen the fusion penetration of Variable Polarity Square-wave AC tungsten argon arc melting welding, finish welding.
2. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method is characterized in that: but wherein the tungsten electrode of Variable Polarity Square-wave AC tungsten argon arc is a positive half-wave electric current independent regulation for negative and tungsten electrode, and adjustable range is 5～300A.
3. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method is characterized in that: wherein the defocusing amount of laser beam is-2 to-3mm.
4. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method is characterized in that: wherein the tungsten electrode center of Variable Polarity Square-wave AC argon tungsten-arc welding and the spacing between the laser beam center are 1 to 3mm.
5. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method, it is characterized in that: described Variable Polarity Square-wave AC tungsten electrode rifle and laser beam ejecting gun are fixed on the screw rod, weld by the distance of regulating between Variable Polarity Square-wave AC tungsten electrode center and the laser beam center.
6. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method is characterized in that: the welding portion of wherein said workpiece to be welded has 0.1mm or littler butt joint space.
7. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method is characterized in that: the electric arc direction that described Variable Polarity Square-wave AC tungsten electrode is emitted and the direction of illumination of laser beam be parallel to each other and the vertical welding portion that acts on workpiece to be welded on.
8. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method is characterized in that: described workpiece material to be welded is one or both in aluminium alloy, magnesium alloy, copper alloy, titanium alloy and the low-alloy steel.
9. Variable Polarity Square-wave AC tungsten argon arc according to claim 1 and laser complex welding method is characterized in that: the cross section of described workpiece welding portion to be welded forms I shape or Y shape groove toward each other.
10. Variable Polarity Square-wave AC tungsten argon arc according to claim 9 and laser complex welding method is characterized in that: the angle of described Y shape groove should be less than or equal to 10 °.
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| CN112792432A (en) * | 2020-12-31 | 2021-05-14 | 福尼斯(南京)表面工程技术有限公司 | Polarity-variable double-tungsten-electrode surfacing system and using method thereof |
| CN113118615A (en) * | 2021-04-26 | 2021-07-16 | 中南大学 | Friction stir welding device and method |
| CN113414494A (en) * | 2021-07-06 | 2021-09-21 | 中车广东轨道交通车辆有限公司 | Welding method of aluminum alloy and stainless steel capable of obtaining high-strength welding joint |
| CN113427132A (en) * | 2021-07-06 | 2021-09-24 | 中车广东轨道交通车辆有限公司 | Laser-double TIG electric arc composite self-melting brazing method for aluminum alloy and stainless steel |
| CN113832458A (en) * | 2020-06-23 | 2021-12-24 | 天津大学 | Laser cladding method for inhibiting cracking of FeCoCrNiMnAl high-entropy alloy cladding layer |
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