CN205040091U - Laser beam welding aperture plasma electrical characteristics detection device - Google Patents
Laser beam welding aperture plasma electrical characteristics detection device Download PDFInfo
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- CN205040091U CN205040091U CN201520793569.8U CN201520793569U CN205040091U CN 205040091 U CN205040091 U CN 205040091U CN 201520793569 U CN201520793569 U CN 201520793569U CN 205040091 U CN205040091 U CN 205040091U
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Abstract
The utility model discloses a laser beam welding aperture plasma electrical characteristics detection device, detection device comprises upper cover and lower cover to wherein setting up detection agency, water inlet tap, suction nozzle, faucet, play air cock and connecting pipe, setting up the insulating layer at detection device's basal surface, be used for with work piece, welding seam insulatingly. Use electrical characteristics detection device at laser welding welding seam in -process, link to each other through varistor ware, amplifier and capture card and computer, directly gather laser beam welding aperture plasma's electrical characteristics signal. The technical scheme of the utility model stability is stronger, and the detection range is bigger, and check -out time is longer, and to the formation and the development of laser beam welding in -process aperture, the on -line measuring of laser welding quality has important actual meaning.
Description
Technical field
The utility model belongs to laser processing technology, more specifically, be specifically related to checkout gear and the method for the electrical characteristics comprising plasma and workpiece upper plasma plumage in aperture in a kind of detection laser welding process, the implication of aperture plasma described in the utility model to refer under deep penetration welding condition in aperture plasma and by the plasma gushed out in aperture.
Background technology
In laser beam welding, high energy laser beam and workpiece and protective gas interact, and produce plasma, also known as laser plasma.Laser Welding can be divided into thermal conductance to weld and deep penetration welding two kinds of patterns, and specifically, the plasma produced in Laser Deep Penetration Welding comprises the plasma in aperture and the plasma plume above workpiece, can unite and be referred to as plasma.The plasma produced in welding process on welding process whether stablize and welding quality difference has important impact.So have important practical significance to the research of laser plasma.
From dialectical angle, laser plasma is the bridge of our exploring laser light welding process.On the one hand, in laser plasma, contain the important information about welding process, such as optical, electrical and acoustical signal, have more research both at home and abroad, the essential information about welding process can be obtained by the research of information in article on plasma; On the other hand, the welding quality of plasma on workpiece has important impact, is in particular in that the plasma plume above workpiece is to the scattering of laser beam and absorption, and the energy density making laser arrive surface of the work reduces, and then affects welding quality.Because the utility model only relates to the detection of the laser plasma signal of telecommunication, therefore at this, prior art about the detection of the laser plasma signal of telecommunication is described.In the electrical signal detection of general steady-state plasma, the most extensive with Langmuir probe, this is a kind of active probe, but and is not suitable for the detection with the plasma electric characteristic of certain fluctuation produced in laser beam welding.In addition, prior art about passive electrical probe in detecting laser plasma electrical characteristics has, and photoelectricity probe and the using method (patent No. 201110360537.5) thereof of the passive electric detection device of laser plasma and method (patent No. 201310513676.6) and detection laser plasma have obtained Patents mandate.It should be noted that under Laser Deep Penetration Welding pattern, be filled with plasma in aperture, at steam pressure, under the state that molten bath static pressure and surface tension balance mutually, aperture maintains and opens, and welding process is stablized.So, to monitor Laser Welding Quality, be necessary to detect the plasma characteristics in aperture.But, no matter utilize the plasma plume that photoelectricity probe or Langmuir probe or the isoionic method of passive electrical probe in detecting are only confined to above workpiece now, the device and method of plasma characteristics in the aperture not under a kind of detection laser deep penetration welding pattern.
Utility model content
The purpose of this utility model is to overcome prior art limitation of plasma electric characteristic in aperture under detection laser deep penetration welding pattern, a kind of power source model comprising the plasma gushed out in little keyhole plasma and aperture is proposed, and on this basis a kind of device and method that can detect aperture plasma electric properties of utility model, achieve the detection to aperture plasma electric properties under Laser Deep Penetration Welding pattern.
Technical purpose of the present utility model is achieved by following technical proposals:
Laser Welding aperture plasma electric properties checkout gear, comprises electrical signal detection device, first and connects wire, the second connection wire, rheostat, amplifying circuit, data collecting card and computer, wherein:
Electrical signal detection device connects wire by second and is connected with rheostat; First one end connecting wire is connected with rheostat, and the other end is connected with workpiece; Rheostat is connected with amplifying circuit, amplifying circuit is connected with data collecting card, data collecting card is connected with computer, laser beam and workpiece and protective gas interact, form plasma, current signal in plasma is drawn through the connection wire of electrical signal detection device and workpiece, flow through external load resistance (i.e. rheostat), the voltage signal at load resistance two ends is gathered by amplifying circuit and data collecting card, can be drawn the current signal in plasma by voltage and resistance, final voltage signal and current signal enter computer and store;
Electrical signal detection device comprises detection agency, lower cover and upper cover; Detection agency entirety is cylindric, upper end open, and lower end arranges catch, arranges laser action mouth in the central authorities of catch, arranges gas flow outlet in the side of laser action mouth, and the central authorities of detection agency are through-hole structure, think that laser action provides passage; The middle position of upper cover and lower cover is provided with through hole, and upper cover is connected as a whole for columned housing with lower cover, forms cavity in enclosure interior, under cover the water inlet tap, faucet and the suction nozzle that arrange and be connected with cavity; Outlet nozzle is arranged on the catch of detection agency, and its one end is connected with suction nozzle by connecting tube, and the other end is connected with gas flow outlet; Detection agency entirety is positioned at housing, the upper end of detection agency is fixedly installed in the through hole of upper cover, the catch of detection agency to be fixedly installed in the through hole of lower cover and concordant with the lower surface of lower cover, the lower surface of common composition electrical signal detection device, and heat-resistant insulating layer is set on the lower surface of electrical signal detection device.
In technique scheme, the central authorities of detection agency are through-hole structure, coordinate for laser action provides passage with the laser action mouth of catch central authorities, and lasing light emitter passing through and laser action mouth by probe mechanism, acts on workpiece and carry out laser welding; Through-hole structure is made up of the manhole of upper end and the bellmouth of lower end, the maximum gauge of bellmouth is consistent with manhole diameter, be and be less than or equal to 10mm preferably at 6-10mm, to avoid plasma to the lens effect of laser beam, the minimum diameter of bellmouth is 3-5mm, to make the good surface contact of the lower end bellmouth of the through-hole structure of laser plasma and detection agency.
In technique scheme, the wall thickness of the cylinder-like structure of the upper end of the catch of detection agency is at 2-3mm.
In technique scheme, the thickness of heat-resistant insulating layer is within 0.5mm, and the insulating material of material selection heat-resisting (for the temperature of laser welding, can bear and not occur to melt deformation etc.), selects coating, adheres to; The object of heat-resistant insulating layer is used to be the current circuit that cut-out workpiece upper plasma plumage and welding work pieces form, the current signal in plasma is made to flow into detection agency, this is equivalent to the current circuit changed in plasma, achieves the electrical characteristics this purpose utilizing aperture plasma in signal of telecommunication sniffer detection laser welding process.
In technique scheme, workpiece to be welded is provided with fixture, for clamping and fixed telecommunication checkout gear.
In technique scheme, carry out the conduction of the signal of telecommunication for convenience, detection agency in electrical signal detection device, lower cover, upper cover, water inlet tap, faucet, suction nozzle select metal material, preferably copper, metal material is adopted to be prepared by whole electrical signal detection device entirety, be connected so that all can be connected wire with second at any position of electrical signal detection device, outside exporting telecommunication number.
In technique scheme, water inlet tap and faucet are arranged on the two ends of lower cover diameter, so that after cooling water enters cavity by water inlet tap, after flowing through the longest distance (i.e. the diameter of lower cover), flow out, better for whole electrical signal detection device provides cooling processing from faucet again.
In technique scheme; suction nozzle is arranged on the middle position of the circular arc connecting water inlet tap and faucet; for laser welding protection inert gas from suction nozzle through connecting tube; enter outlet nozzle; flow out through gas flow outlet again; realize Buchholz protection to laser welding, be separated existences, the cooling of cooling water realization simultaneously to connecting tube with what realize gas and cooling water.
In technique scheme; described gas flow outlet to be arranged on catch and to run through whole catch; to form air guide channel; the angle of the axis of air guide channel and the lower surface (i.e. horizontal direction) of whole electrical signal detection device is 30-50 °; to laser and style of work region and around can protect (protect weld seam, prevent it to be oxidized) to make inert gas (nitrogen, helium or argon gas).
In technique scheme, described connecting tube selects soft air-guide pipe.
In technique scheme, outlet nozzle is threaded connection and is arranged on the catch of detection agency.
In technique scheme, upper cover and lower cover outer surface diameter are between 60-100mm, and wall thickness 3-5mm, within the scope of housing depth 30-60mm, to ensure cooling effect.
In technique scheme, the catch of detection agency is threaded with lower cover and fixes.
In technique scheme, the upper end of detection agency is fixedly installed in the through hole of upper cover by backing plate and connecting bolt, and connecting bolt is connected to downward-extension with lower cover, becomes as a whole to make detection agency, upper cover with lower cover.
In technique scheme, the junction of detection agency and upper cover, upper cover and lower cover, probe mechanism and lower cover arranges sealing ring, selects the sealing ring that heat-resistant seal material is prepared.
Utilize said apparatus to detect the method for aperture plasma electric characteristic, carry out according to following step:
Step 1, electrical signal detection device connects wire by second and is connected with rheostat; First one end connecting wire is connected with rheostat, and the other end is connected with workpiece; Rheostat is connected with amplifying circuit, and amplifying circuit is connected with data collecting card, and data collecting card is connected with computer, and the voltage at rheostat two ends enters computer through data collecting card after amplifying circuit; Electrical signal detection device is placed in surface of the work, lasing light emitter is aimed at through hole and the laser action mouth of detection agency in electrical signal detection device, to enable laser beam pass by arriving surface of the work with laser action mouth, the height of the lower surface of the heat-resistant insulating layer of electrical signal detection device and the weld seam upper surface of workpiece is within 2mm;
Step 2, opens lasing light emitter and carries out laser welding, utilizes suction nozzle, connecting tube, outlet nozzle and gas flow outlet to input inert protective gas simultaneously, utilizes water inlet tap and faucet to carry out water-cooled;
Step 3, analog voltage signal is converted to digital electric signal by data collecting card, and digital electric signal enters computer through data acquisition line concentration and shows and store.
In technique scheme, because electrical signal detection device all can surround plasma, so the signal of telecommunication collected is stablized, the scope of collection is also maximum.Change external rheostat resistance (i.e. rheostatic resistance value), make it change from small to large, often change a resistance value, measure a signal of telecommunication, finally can obtain about aperture voltage-current characteristic curve of plasma.
Laser plasma (comprising the plasma in aperture and the plasma plume above workpiece) is considered as a power supply, as shown in Figure 7, inner at plasma, owing to longitudinally there is barometric gradient P in aperture inside
eand temperature gradient T
e, there will be potential difference by the known inside at aperture of formula (1).Inner at plasma, owing to it to be regarded as a power supply, the direction of aperture internal temperature gradient and the direction of electric potential gradient consistent, so electron stream is by (n
e, T
e) 2 (B place) flow direction (n
e, T
e) 0 (O place), be labeled as j
e,h.It is the part of power source model that plasma plume above workpiece is seen as, due to the heart (n in the plasma
e, T
e) temperature at 0 (O place) place and pressure are higher than outside, so from temperature gradient and the relation between barometric gradient and electric potential gradient, in plasma plume, electron stream is by center (n
e, T
e) 0 (O place) with radial to boundary (n
e, T
e) 1 (A place) flowing, be labeled as j
e, pl.Electron stream in sum in aperture flows to O place from B, then flows to A place from O, and this is the electron flow direction of plasma inside.Because plasma contacts with welding work pieces, therefore the electron stream in plasma can flow to welding work pieces, in order to measure the electron stream in aperture plasma, electrical signal detection device of the present utility model is utilized to detect, owing to being coated with one deck heat-resistant insulating layer at electrical signal detection device lower surface, so when laser plasma sprays in aperture, entered the through hole of detection agency by laser action mouth after, electron stream in plasma can not enter welding work pieces, but the testing circuit that inflow detection agency and external rheostat form, (through hole adopts the manhole of upper end and the bellmouth of lower end to concrete testing circuit schematic diagram as shown in Figure 8, contacted with laser plasma by the surface of lower end bellmouth), the detection of aperture plasma electric properties in laser beam welding can be realized like this.Consider the impact of plasma mesotheca effect layer, the current potential on detection agency is for shown in formula (2).
Formula (1), ▽ φ in (2)
plasmafor the electric potential gradient in plasma, n
efor electron density, T
efor electron temperature, e is electron charge, m
ifor mass of ion, φ
probefor the current potential (current potential namely on electrical signal detection device) on detection agency; ▽ T
efor electron temperature gradient, ▽ n
efor electron density gradient, k is Planck's constant.
Compared with prior art, detection method of the present utility model and checkout gear and maximum not being both of existing detection laser plasma method are, the checkout gear that the utility model proposes and detection method detection laser can weld the medium and small keyhole plasma electrical characteristics of process, and this is that existing technology can not be accomplished.In addition, this detection method for laser plasma, stability is stronger, and detection range is larger, and detection time is longer, and for formation and the differentiation of aperture in laser welding processes, the on-line checkingi of Laser Welding Quality has important practical significance.
Accompanying drawing explanation
Fig. 1 is the rough package drawing of aperture plasma electric properties checkout gear in laser beam welding of the present utility model, wherein 13-welding work pieces, 14-weld seam, 15-signal of telecommunication sniffer, 16-first connects wire, for connecting welding workpiece, 17-rheostat, 18-amplifying circuit, 19-data collecting card, 20-computer, 21-second connects wire, for connecting signal of telecommunication sniffer, 22-laser beam, 23-fixture.
Fig. 2 is the three-dimensional appearance schematic diagram of signal of telecommunication sniffer of the present utility model, wherein 1-detection agency, 3-lower cover, 4-water inlet tap, 5-upper cover, 6-backing plate, 7-connecting bolt, 9-suction nozzle, 10-faucet.
Fig. 3 is the vertical view of signal of telecommunication sniffer of the present utility model, wherein 1-detection agency, 4-water inlet tap, 5-upper cover, 6-backing plate, 7-connecting bolt, 9-suction nozzle, 10-faucet.
Fig. 4 is the cutaway view in B-B direction in corresponding diagram 3, wherein 1-detection agency, 2-outlet nozzle, 3-lower cover, 4-water inlet tap, 5-upper cover, 6-backing plate, 7-connecting bolt, 8-sealing ring, 10-faucet, 12-heat-resistant insulating layer.
Fig. 5 be signal of telecommunication sniffer of the present utility model disassemble view, wherein 1-detection agency, 1-1 is laser action mouth, and 1-2 is gas flow outlet, 2-outlet nozzle, 3-lower cover, 4-water inlet tap, 5-upper cover, 6-backing plate, 7-connecting bolt, 8-sealing ring, 9-suction nozzle, 10-faucet, 11-flexible pipe.
Fig. 6 is the position relationship schematic diagram of signal of telecommunication sniffer of the present utility model and welding work pieces, wherein 13-welding work pieces, 14-weld seam, 15-signal of telecommunication sniffer, 22-laser beam, 23-fixture, h is the distance between detection agency insulating barrier lower surface and welding work pieces.
Fig. 7 is aperture plasma electrical source modular concept figure, wherein 13-welding work pieces, 22-laser beam, 24-welding pool, 25-aperture, 26-plasma plume, B point is positioned among aperture, O point is arranged in plasma plume, and A point is arranged in welding pool, and the radius that opens of plasma plume is labeled as R.
Fig. 8 is the circuit theory schematic diagram utilizing aperture plasma electric properties in the signal of telecommunication sniffer detection laser weldering process that the utility model proposes, wherein 12-heat-resistant insulating layer, 13-welding work pieces, 15-signal of telecommunication sniffer, 17-rheostat, 22-laser beam, 24-welding pool, 25-aperture, 26-plasma plume.
Fig. 9 is under Laser Deep Penetration Welding pattern, the signal of telecommunication of the aperture plasma collected, and the signal of telecommunication is external rheostat resistance value is gained under 2000 Ω.
Figure 10 is the face of weld shape appearance figure obtained under Laser Deep Penetration Welding pattern.
Figure 11 is the seam cross-section shape appearance figure obtained under Laser Deep Penetration Welding pattern.
Figure 12 is under laser thermal conductance weldering pattern, the signal of telecommunication of the aperture plasma collected, and the signal of telecommunication is external rheostat resistance value is gained under 2000 Ω.
Figure 13 is the face of weld shape appearance figure obtained under laser thermal conductance weldering pattern.
Figure 14 is the seam cross-section shape appearance figure obtained under laser thermal conductance weldering pattern.
Figure 15 is the signal of telecommunication divided stages schematic diagram of the aperture plasma collected under Laser Deep Penetration Welding pattern.
Figure 16 is the graph of relation in laser beam welding between voltage magnitude and external rheostat resistance value, wherein curve 1 is welding starting stage---the graph of relation of keyhole formation starting stage (i.e. I stage) voltage magnitude and rheostat resistance value, and curve 2 is welding stabilization sub stage---the graph of relation of aperture stabilization sub stage (i.e. III stage) voltage magnitude and rheostat resistance value.
Figure 17 is the laser welding starting stage, i.e. the Voltammetric Relation curve chart of keyhole formation starting stage aperture plasma.
Figure 18 is the laser welding stabilization sub stage, i.e. the Voltammetric Relation curve chart of aperture stabilization sub stage aperture plasma.
Embodiment
The technical solution of the utility model is further illustrated below in conjunction with specific embodiment.
As shown in accompanying drawing 1-5, Laser Welding aperture plasma electric properties checkout gear of the present utility model, comprises electrical signal detection device, first and connects wire, the second connection wire, rheostat, amplifying circuit, data collecting card and computer, wherein:
Electrical signal detection device connects wire by second and is connected with rheostat; First one end connecting wire is connected with rheostat, and the other end is connected with workpiece; Rheostat is connected with amplifying circuit, and amplifying circuit is connected with data collecting card, and data collecting card is connected with computer;
Whole electrical signal detection device entirety adopts metallic copper to be prepared, and electrical signal detection device comprises detection agency, lower cover and upper cover; Detection agency entirety is cylindric, upper end open, and lower end arranges catch, arranges laser action mouth in the central authorities of catch, arranges gas flow outlet in the side of laser action mouth, and the central authorities of detection agency are through-hole structure, think that laser action provides passage; The middle position of upper cover and lower cover is provided with through hole, and upper cover is connected as a whole for columned housing with lower cover, forms cavity in enclosure interior, under cover the water inlet tap, faucet and the suction nozzle that arrange and be connected with cavity; Outlet nozzle is arranged on the catch of detection agency, its one end is connected with suction nozzle by connecting tube, the other end is connected with gas flow outlet, gas flow outlet to be arranged on catch and to run through whole catch, to form air guide channel, the angle of the axis of air guide channel and the lower surface of whole electrical signal detection device is 30 °; Detection agency entirety is positioned at housing, the upper end of detection agency is fixedly installed in the through hole of upper cover, the catch of detection agency to be fixedly installed in the through hole of lower cover and concordant with the lower surface of lower cover, the lower surface of common composition electrical signal detection device, and heat-resistant insulating layer 0.5mm is set on the lower surface of electrical signal detection device.
The central authorities of detection agency are through-hole structure, coordinate for laser action provides passage with the laser action mouth of catch central authorities, and lasing light emitter passing through and laser action mouth by probe mechanism, acts on workpiece and carry out laser welding; Through-hole structure is made up of the manhole of upper end and the bellmouth of lower end, and the maximum gauge of bellmouth is consistent with manhole diameter, is 10mm, and the minimum diameter of bellmouth is 5mm.The wall thickness of the cylinder-like structure of the upper end of the catch of detection agency is at 2mm.
Water inlet tap and faucet are arranged on the two ends of lower cover diameter, and suction nozzle is arranged on the middle position of the circular arc connecting water inlet tap and faucet, and upper cover and lower cover outer surface diameter are 100mm, wall thickness 3mm, and housing depth is 60mm; Outlet nozzle is threaded connection and is arranged on the catch of detection agency; The catch of detection agency is threaded with lower cover and fixes; The upper end of detection agency is fixedly installed in the through hole of upper cover by backing plate and connecting bolt, and connecting bolt is connected to downward-extension with lower cover, becomes as a whole to make detection agency, upper cover with lower cover; The junction of detection agency and upper cover, upper cover and lower cover, probe mechanism and lower cover arranges sealing ring, selects the sealing ring that heat-resistant seal material is prepared.
As shown in Figure 6, the height of the lower surface of the heat-resistant insulating layer of electrical signal detection device and the weld seam upper surface of workpiece, at 2mm, workpiece to be welded is provided with fixture, for clamping and fixed telecommunication checkout gear.
Electrical signal detection device connects wire by second and is connected with rheostat; First one end connecting wire is connected with rheostat, and the other end is connected with workpiece; Rheostat is connected with amplifying circuit, and amplifying circuit is connected with data collecting card, and data collecting card is connected with computer, and the voltage at rheostat two ends enters computer through data collecting card after amplifying circuit; Electrical signal detection device is placed in surface of the work; lasing light emitter is aimed at through hole and the laser action mouth of detection agency in electrical signal detection device; open lasing light emitter and carry out laser welding; utilize suction nozzle, connecting tube, outlet nozzle and gas flow outlet to input inert protective gas simultaneously; water inlet tap and faucet is utilized to carry out water-cooled; whole electrical signal detection device is maintained within a relatively low temperature range, avoids laser welding to produce heat to the impact of equipment.
The equipment of the utility model embodiment adopts Nd:YAG laser; optical maser wavelength 1.06 μm; condenser lens focal length 300mm; welding process adopts laser surface from melting method, thickness of slab 3mm, and testing protection gas used is Ar gas; throughput 25L/min; defocusing amount-1mm, the A304 stainless steel that the eruption of material selection Laser Welding plasma is stronger, selected welding parameter is as shown in table 1.
Table 1
| Laser power | Speed of welding | Defocusing amount | Shielding gas flow amount |
| 1200w | 4mm/s | -1 | 25L/min |
After the laser beam welding signal of telecommunication is collected, amplifies and filtering through modulate circuit, utilize capture card carry out A/D conversion and store, and be transferred to computer.
Fig. 9-11 is the signal of telecommunication, face of weld pattern and seam cross-section shape appearance figure (it is gained under 2000 Ω that the signal of telecommunication is external load resistance) under Laser Deep Penetration Welding pattern, under stable deep penetration welding pattern, the signal of telecommunication initial stage there will be a larger peak value, after transition stage, the signal of telecommunication remains stable.Face of weld is smoothly bright and clean, and workpiece is by through welding.This is due in welding process, and after keyhole formation, maintain the state of opening, laser energy can enter aperture fully.
Figure 12-14 is the signal of telecommunication, face of weld pattern and seam cross-section shape appearance figure (it is gained under 2000 Ω that the signal of telecommunication is external load resistance) under laser thermal conductance weldering pattern, the signal of telecommunication under thermal conductance weldering pattern is in time domain scale, not initial spike, and have diametrically opposite variation tendency with the signal of telecommunication under deep penetration welding pattern.Along with the carrying out of welding process, the absolute value of signal of telecommunication amplitude first increases rear maintenance and stablizes, and the absolute value of signal of telecommunication amplitude is all less than the initial spike of the signal of telecommunication under deep penetration welding pattern in time domain scale.Compared with deep penetration welding pattern, the welding seam deep width ratio under thermal conductance weldering pattern seriously reduces.
The electrical characteristics of the aperture plasma in wanting detection laser to weld, so the utility model chooses the signal of telecommunication under deep penetration welding pattern, rear discovery is analyzed to it, by signal of telecommunication detection to Laser Deep Penetration Welding pattern under the signal of telecommunication process of Laser Deep Penetration Welding can well be described.As shown in figure 15, be signal of telecommunication divided stages schematic diagram under deep penetration welding pattern.According to result of study in the past can to it be divided into three phases (signal of telecommunication applied in Figure 15 is rheostat resistance value be 2000 Ω time the signal of telecommunication that obtains, intercept the time range of 0.6s).
I: welding starting stage (under deep penetration welding pattern, the starting stage of keyhole formation), time range is in 1-10ms; II: in the welding transition stage (under deep penetration welding pattern, aperture is from being formed into the stable stage), time range is in 0.5s; III: welding stabilization sub stage (under deep penetration welding pattern, the stage that aperture is stable).
For the three phases divided, weight analysis welding starting stage (I stage) and stabilization sub stage (III stage).Aperture plasma electric properties detection method proposed above is utilized to test, external rheostat resistance value changes between 0-25k Ω, depicts the relation curve between the voltage magnitude of keyhole formation starting stage (I stage) and aperture stabilization sub stage (III stage) and resistance value.As shown in figure 16, can find in I and III process, the absolute value of voltage magnitude increases along with the increase of rheostatic resistance value, when after 20k Ω, change is little, substantially reaches capacity.The absolute value of the signal of telecommunication amplitude of welding starting stage is higher than the absolute value of the signal of telecommunication amplitude of stabilization sub stage.Determine the relation curve between magnitude of voltage and resistance value, and then the volt-ampere characteristic about aperture starting stage (I stage) and stabilization sub stage (III stage) can be depicted.
Figure 17 is welding initial rank and keyhole formation starting stage (I stage) etc. in vitro volt-ampere characteristic figure, can find out, in welding starting stage (I stage), volt-ampere curve is straight line, namely, under laser power is 1200w (cw) condition, the internal resistance as the aperture plasma of power supply is certain value (about 2370 ohm).And be a curve in welding stabilization sub stage (III stage) isoionic volt-ampere curve (as Figure 18), the now internal resistance of aperture plasma is not a definite value.
In sum: the utility model proposes a kind of power source model comprising plasma and workpiece upper plasma plumage in aperture newly, and propose a kind of checkout gear and the detection method that detect aperture plasma electric properties on this basis, the detection to the electrical characteristics of aperture plasma in laser welding processes can be realized, i.e. Laser Welding aperture plasma electric properties checkout gear of the present utility model, electrical signal detection device and the application of method in detection laser welding process in aperture plasma electric properties, the signal of telecommunication under Laser Deep Penetration Welding pattern is gathered when fixing outer meeting resistance resistance, the signal of telecommunication under laser thermal conductance weldering pattern is gathered when fixing outer meeting resistance resistance, when changing outer meeting resistance resistance for the relation curve of the magnitude of voltage under Laser Deep Penetration Welding pattern and resistance value and volt-ampere characteristic.
Above exemplary description is done to the utility model; should be noted that; when not departing from core of the present utility model, any simple distortion, amendment or other those skilled in the art can not spend the equivalent replacement of creative work all to fall into protection range of the present utility model.
Claims (8)
1. Laser Welding aperture plasma electric properties checkout gear, is characterized in that, comprises electrical signal detection device, first and connects wire, the second connection wire, rheostat, amplifying circuit, data collecting card and computer, wherein:
Electrical signal detection device connects wire by second and is connected with rheostat; First one end connecting wire is connected with rheostat, and the other end is connected with workpiece; Rheostat is connected with amplifying circuit, and amplifying circuit is connected with data collecting card, and data collecting card is connected with computer;
Electrical signal detection device comprises detection agency, lower cover and upper cover; Detection agency entirety is cylindric, upper end open, and lower end arranges catch, arranges laser action mouth in the central authorities of catch, arranges gas flow outlet in the side of laser action mouth, and the central authorities of detection agency are through-hole structure; The middle position of upper cover and lower cover is provided with through hole, and upper cover is connected as a whole for columned housing with lower cover, forms cavity in enclosure interior, under cover the water inlet tap, faucet and the suction nozzle that arrange and be connected with cavity; Outlet nozzle is arranged on the catch of detection agency, its one end is connected with suction nozzle by connecting tube, the other end is connected with gas flow outlet, gas flow outlet to be arranged on catch and to run through whole catch, form air guide channel, the angle of the axis of air guide channel and the lower surface of whole electrical signal detection device is 30-50 °; Detection agency entirety is positioned at housing, the upper end of detection agency is fixedly installed in the through hole of upper cover, the catch of detection agency to be fixedly installed in the through hole of lower cover and concordant with the lower surface of lower cover, the lower surface of common composition electrical signal detection device, and heat-resistant insulating layer is set on the lower surface of electrical signal detection device; The central authorities of detection agency are through-hole structure.
2. Laser Welding aperture plasma electric properties checkout gear according to claim 1, it is characterized in that, through-hole structure is made up of the manhole of upper end and the bellmouth of lower end, the maximum gauge of bellmouth is consistent with manhole diameter, be 6-10mm, the minimum diameter of bellmouth is 3-5mm.
3. the Laser Welding aperture plasma electric properties checkout gear according to claims 1 or 2, it is characterized in that, the thickness of heat-resistant insulating layer is within 0.5mm.
4. the Laser Welding aperture plasma electric properties checkout gear according to claims 1 or 2, is characterized in that, workpiece to be welded is provided with fixture, for clamping and fixed telecommunication checkout gear.
5. the Laser Welding aperture plasma electric properties checkout gear according to claims 1 or 2, it is characterized in that, water inlet tap and faucet are arranged on the two ends of lower cover diameter, and suction nozzle is arranged on the middle position of the circular arc connecting water inlet tap and faucet.
6. the Laser Welding aperture plasma electric properties checkout gear according to claims 1 or 2, it is characterized in that, outlet nozzle is threaded connection and is arranged on the catch of detection agency; The catch of detection agency is threaded with lower cover and fixes.
7. the Laser Welding aperture plasma electric properties checkout gear according to claims 1 or 2, it is characterized in that, the upper end of detection agency is fixedly installed in the through hole of upper cover by backing plate and connecting bolt, and connecting bolt is connected to downward-extension with lower cover, the junction of detection agency and upper cover, upper cover and lower cover, probe mechanism and lower cover arranges sealing ring.
8. the Laser Welding aperture plasma electric properties checkout gear according to claims 1 or 2, it is characterized in that, the wall thickness of the cylinder-like structure of the upper end of the catch of detection agency is at 2-3mm, upper cover and lower cover outer surface diameter are between 60-100mm, wall thickness 3-5mm, within the scope of housing depth 30-60mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520793569.8U CN205040091U (en) | 2015-10-14 | 2015-10-14 | Laser beam welding aperture plasma electrical characteristics detection device |
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|---|---|---|---|
| CN201520793569.8U CN205040091U (en) | 2015-10-14 | 2015-10-14 | Laser beam welding aperture plasma electrical characteristics detection device |
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| CN201520793569.8U Withdrawn - After Issue CN205040091U (en) | 2015-10-14 | 2015-10-14 | Laser beam welding aperture plasma electrical characteristics detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105228327A (en) * | 2015-10-14 | 2016-01-06 | 天津大学 | Laser Welding aperture plasma electric properties checkout gear and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105228327A (en) * | 2015-10-14 | 2016-01-06 | 天津大学 | Laser Welding aperture plasma electric properties checkout gear and method |
| CN105228327B (en) * | 2015-10-14 | 2017-07-25 | 天津大学 | Laser welding small hole plasma electric properties detection means and method |
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