CN104625403A - Method for restraining myriawatt-class laser welding thick plate upper surface defects - Google Patents
Method for restraining myriawatt-class laser welding thick plate upper surface defects Download PDFInfo
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- CN104625403A CN104625403A CN201510039722.2A CN201510039722A CN104625403A CN 104625403 A CN104625403 A CN 104625403A CN 201510039722 A CN201510039722 A CN 201510039722A CN 104625403 A CN104625403 A CN 104625403A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
Abstract
The invention provides a method for restraining myriawatt-class laser welding thick plate upper surface defects. The method comprises the specific steps that 1, a welding plate (5) is machined, a metal particle conveying head (3) is installed on a laser welding head (1), and the conveying position of metal particles (16) is on the rear edge of a welding pool (27) lack of fusion; 2, the metal particles (16) are loaded into the metal particle conveying head (3), and a metal particle heating device is turned on to heat the metal particles (16) to the temperature from 900 DEG C to 1100 DEG C below the melting point; 3, the power of a laser is controlled, a laser beam (4) irradiates the welding plate (5) to form the welding pool lack of fusion, a metal particle conveying system controlled by compressed air is turned on, and the heated metal particles are pushed to the welding pool lack of fusion; 4, an inertia shielding gas annular air blow pipe (10) is turned on, and a laser welding head (1) and the metal particle conveying head (3) synchronously move to complete the welding process. According to the method, material losses generated by some splashes can be complemented, and welding bead subsidence is reduced.
Description
Technical field
The present invention relates to the suppressing method of upper surface portion defect during a kind of myriawatt level laser welding slab, be mainly used in myriawatt level slab laser beam welding, improve the stability in Laser Deep Penetration Welding molten bath, the formation suppressing upper surface to splash and the impact reducing lower surface Welding bead subsidence, finally improve welding quality.
Background technology
Laser technology is a kind of electromagnetic wave with special nature, one of important invention of 21st century, because laser has high brightness and high directivity, and the advantage such as good monochromaticjty and coherence, after the development of decades, laser technology obtains a wide range of applications at industrial circle.Laser weld is one of important application technology of laser processing technology, has a extensive future, and is progressively replacing other prior welding mode at present.Laser weld focuses on high energy beam, the technique that deep penetration welding, fast welding etc. are difficult to realize can be realized, equipment collocation flexibly, detection technique is ripe, automation can be realized in production in enormous quantities, laser weld production lines existing a large amount of at present drops into industrial production, especially in the industrial country of prosperity.
Thick plates is the new application aspect of laser weld, future will shipbuilding, aircraft manufacturing, etc. industrial circle obtain break through application, traditional thick plates method has arc welding, electron beam welding etc., technique is loaded down with trivial details, need to carry out multiple tracks welding, and succeeding in developing along with ultra high power laser instrument in recent years, the research using high power laser light to carry out single track thick plates becomes focus.
Laser Deep Penetration Welding is the basic principle of laser weld slab, there is welding point depth-to-width ratio large, speed of welding is fast, heat affected area is little, welding deformation is little and generally do not add the advantages such as packing material, during welding, the formation of the deeply molten aperture of laser and stability determine the quality of appearance of weld, when using single track laser weld slab, required pure laser power is often very high and capacity usage ratio is lower, so welding pool is difficult to shaping and keeps stable, thus produce splashing, hump, subside, the defect such as pore and not weld penetration, the research carrying out this respect has deep theory significance.
Laser compound welding slab is one of major way solving thick plates problem at present, particularly hybrid Laser-Arc Welding, can effectively reduce required laser power, improves appearance of weld efficiency, but also there is some problems to be solved.
Disclosed in 27 days November in 2013, publication number is CN103406675A, a kind of laser and the electric arc combined method and the fixture that weld slab high-strength steel of using of invention disclosure of the invention that denomination of invention is " a kind of slab high-strength steel laser arc hybrid welding method and fixture thereof ", by opening double groove process to the slab high-strength steel of welding, workpiece prepares, the pre-heat treatment, and use laser and electric arc combined soldering to weld.Advantage is: compare conventional multilayer multi-pass welding and tap into step obviously, technique simplifies greatly, adopt the mode of the direct preheating of laser, without the need to other preheating devices, simplify pre-heating technique.Shortcoming is: need to offer double groove, and need design specialized fixture, efficiency is low; Preheating number of times is more, and the bad accurate control of preheat temperature, affects component shaping quality.
Disclosed in 3 days April in 2013, publication number is CN103008895A, denomination of invention to be known clearly a kind of laser multiple tracks welding method towards slab for the invention disclosure of the invention of " a kind of narrow gap multiple tracks method for laser welding towards slab ", wherein on slab preset clearance or open in advance one band root face groove, laser is adopted to carry out bottoming together from being welding in weldering, carry out wire filling laser welding again, finally carry out laser one GMAW Combined Welding, complete the welding of slab.Advantage is: reduce welding material and energy ezpenditure, reduce welding production cost; Hot compression amount of plastic deformation reduces, and along homogenising that thickness of slab direction more becomes, joint residual stress and residual deformation reduce, and can obtain less heat affected area simultaneously, and joint toughness improves.Shortcoming is: successively carry out laser from melting welding, wire filling laser welding, laser-arc hybrid welding process, and all needs to offer prebeveling, and technique is too complicated, and equipment replacement is frequent, and production efficiency is low.
Disclosed in 4 days December in 2013, publication number is CN103418917A, denomination of invention a kind of novel laser compound welding method that has been the invention disclosure of the invention of " a kind of method of laser and motlten metal composite welding sheet material ", it is characterized in that: use pure laser weld, set up spray gun bottom weld seam, during welding molten metal bath from metal melting device through lance ejection in the groove of bottom, object solves current ultra high power laser from fusion welding, heavy thickness plate downhand welding joint, in the saturating weld forming process of dark burn through, appearance subside and under the weld defect such as to fall.Advantage is: equipment is simple, and method easily realizes, can effectively suppress weld seam subside and under the significant deficiency such as to fall.Problems existing is: although inhibit the defect bottom weld seam, and forming quality and the suppression upper surface on uncontrollable weld seam top splash.
The substantive characteristics of Laser Deep Penetration Welding there is keyhole effect, namely when high power density laser is irradiated to surface of the work, material surface produces gasification, produce plasma simultaneously, under vapor pressure effect, generation aperture that melted material is dished out, light beam is deep into the inside of material along aperture, by aperture hole wall, the multiple reflections absorption of laser and the inverse bremstrahlen of plasma are absorbed, realize penetration fustion welding.Inside and outside weld keyhole and hole, the dynamic behaviour of plasma determines the state of appearance of weld, is a very complicated energy material coupling process.When welding pool is difficult to keep stable, molten bath big ups and downs change, and the interaction of metallic vapour and plasma inside and outside the aperture of molten bath, so easily produce splashing, hump, subside, the defect such as pore and not weld penetration.
The principle that splashing defect produces is because optical-fiber laser is due to its strong-focusing and wavelength is short, and the little wall surface of the hole of welding pool is easy to produce hot-spot.In myriawatt level optical-fiber laser penetration fustion welding slab process, the upper and lower surface of weld seam all easily produces splashing, and particularly, upper surface splashes and mainly betides non-penetration weld termination process, and be distributed in weld seam both sides, even fly out welding piece.The upper surface principle produced of splashing is: during the welding of (1) non-penetration low speed, the front/rear edge of aperture exists bottom-up molten bath flowing, causes forward position motlten metal to stretch out molten bath, rear along motlten metal at surface elevation; With violent metallic vapour/plasma jet, motlten metal keyhole formation of directly dishing out splashes, or stretches out molten bath and form metal fluid column, departs from molten bath step by step and is formed and splash; (2) during non-penetration high-speed welding, metallic vapour sprays to the opposite direction of welding direction, motlten metal continuously after aperture along stretching out molten bath, form the metal fluid column of inclination, metallic vapour imposes shearing force to rear along wall molten bath and metal fluid column, and the momentum that motlten metal is moved upward overcomes surface tension and gravity and departs from molten bath and formed and splash.And splash when producing, a large amount of to splash and metal fluid column is dished out molten bath, cause motlten metal loss and form upper surface and subside.
Summary of the invention
The present invention proposes a kind of method suppressing myriawatt level laser to weld slab upper surface defect, improve the stability in Laser Deep Penetration Welding molten bath, suppress the generation that upper surface splashes simultaneously, supplement the metal material run off because of splashing, reduce the formation of Welding bead subsidence, improve welding quality.
The invention provides a kind of method suppressing myriawatt level laser to weld slab upper surface defect, its concrete steps are as follows:
Step 1: process welded blank, is mounted in laser welding system by metallic particles delivery head, and metallic particles transfer position is edge after non-penetration welding pool, and metallic particles delivery head is perpendicular to welded blank surface and welding direction;
Step 2: loaded by metallic particles in metallic particles delivery head, opens metallic particles heater, is heated to the following temperature 900-1100 degree Celsius of metallic particles fusing point;
Step 3: control laser power, laser beam irradiation welded blank forms non-penetration welding pool, opens the metallic particles induction system that compressed air controls, and pushes by the metallic particles that heats to non-penetration welding pool;
Step 4: open inertia protection gas ring shape gas blow pipe, laser welding system and metallic particles delivery head synchronizing moving, complete welding process.
The invention has the beneficial effects as follows:
1. in the present invention, metallic particles is admitted to edge after laser weld pools, be aided with compressed-air actuated injection, resist metallic vapour to while the rear shearing force imposed along wall molten bath and metal fluid column, enhance the mobility of welding pool, decrease defect odds, prevent motlten metal to overcome surface tension and gravity and move upward and depart from molten bath and formed and splash
2. the present invention can supply the loss of material when part splashing produces, and reduces the generation of Welding bead subsidence.
3. the metallic particles sending into molten bath in the present invention is in the not molten condition of high temperature, can increase the heat input in welding process, increase welding penetration performance, improve welding efficiency.
4. the metallic particles sending into molten bath in the present invention is made up of di-iron trioxide mixing trace rare-earth element yttrium, can strengthen the mobility of welding pool, reduces the content of welding point solid solution state impurity, improves the plasticity of joint, strength joint physical property.Refinement joint microstructure, increases grain boundary area, and its deformation drag and fracture resistance are increased.
5. in the present invention, inertia protection gas blows around metallic particles throughput direction annular, can stop the splatter that welded blank surface is fragmentary along weld seam both sides; Metallic particles induction system by the GRAVITY CONTROL metallic particles of compressed-air actuated switch and metallic particles conveying and supplement, convenient flexibly.
Accompanying drawing explanation
Fig. 1 is suppression laser weld defect method equipment therefor of the present invention and material schematic diagram;
Fig. 2 is the outside schematic diagram of metallic particles delivery head;
Fig. 3 is metallic particles delivery head off working state schematic internal view;
Fig. 4 is metallic particles delivery head duty schematic internal view;
Fig. 5 is inertia protection gas ring shape gas blow pipe schematic diagram;
Fig. 6 is schematic diagram before present embodiment weldering;
Fig. 7 is myriawatt level laser welding slab high-speed welding splashing defect schematic diagram;
Fig. 8 is that present embodiment suppresses high-speed welding splashing defect schematic diagram;
Wherein: 1-laser welding system, 2-fixed support, 3-metallic particles delivery head, 4-laser beam, 5-welded blank, 6-V type groove, the conduit entrance of 7-metallic particles, 8-first thermocouple temperature sensor, 9-second thermocouple temperature sensor, 10-inertia protection gas ring shape gas blow pipe, 11-second electromagnetic induction heating coil, 12-air duct, 13-first electromagnetic induction heating coil, 14-compressed air mouth, 15-slide block, 16-metallic particles, 17-rectilinear orbit, 18-spring, 19-first crank connecting link, 20-air duct exports, 21-bends track, 22-crank straight-bar, 23-second crank connecting link, the import of 24-air duct, 25-metallic vapour, 26-welding pool aperture, the non-penetration welding pool of 27-, 28-splashing molten drop, 29-welding direction.
Detailed description of the invention
Below with reference to accompanying drawing and concrete implementation step, embodiment of the present invention are described.
The invention provides a kind of method suppressing myriawatt level laser to weld slab upper surface defect, its concrete steps are as follows:
Step 1: process welded blank 5, is mounted to metallic particles delivery head 3 in laser welding system 1, and metallic particles 16 transfer position is edge after non-penetration welding pool 27, and metallic particles delivery head 3 is perpendicular to welded blank 5 surface and welding direction 29.
(1) as shown in Figure 1, the high-strength steel sheet material that the present invention uses thickness to be 10-15mm is as welding work pieces, and high-strength steel sheet material uses docking mode, and butt-joint clearance is less than 1mm to ensure weld seam precision, offer bilateral double V-groove 6 on interface top, sheet fabrication chamfering 2-3mm*30 simultaneously.
(2) as shown in Figure 1, metallic particles delivery head 3 is connected with laser welding system 1 by fixed support 2, and metallic particles delivery head 3 is parallel with laser beam 4 direction, perpendicular to welded blank 5 surface.Metallic particles delivery head 3 is regulated by fixed support 2 with the distance of the hot spot of laser beam 4, and lateral separation controls at 5-10mm, and vertical range controls at 8-12mm, can be transported to the rear edge of welding pool aperture 26 exactly with guarantee fund's metal particles 16.
(3) in present embodiment, metallic particles delivery head 3 is perpendicular to welded blank 5 surface and welding direction 29, can under the prerequisite not destroying weld pool stability, metallic particles 16 is sent in non-penetration welding pool 27, reach the stability that the present invention improves Laser Deep Penetration Welding molten bath, suppress the object that upper surface splashes.
Step 2: loaded in metallic particles delivery head 3 by metallic particles 16, opens metallic particles heater, is heated to the following temperature 900-1100 degree Celsius of metallic particles 16 fusing point.
(1), in present embodiment, metallic particles 16 is made up of di-iron trioxide mixing trace rare-earth element yttrium, and shape is standard ball, diameter 2-4mm.Di-iron trioxide can supplement the loss of material in welding process, and ferro element can not affect the structural constituent of welding point; The oxygen element wherein contained can improve the mobility of welding pool, improves welding seam deep width ratio, reduces weld seam internal flaw; Rare earth element yttrium can reduce the content of welding point solid solution state impurity, improves the plasticity of joint, strength joint physical property, refinement joint microstructure, increases grain boundary area, and its deformation drag and fracture resistance are increased.
(2) as shown in Figure 2, Figure 3, Figure 4, metallic particles delivery head 3 structural representation.Metallic particles delivery head 3 external structure: inertia protection gas ring shape gas blow pipe 10 is centered around metallic particles delivery head 3 end, the metallic particles heating system that two groups of electromagnetic induction heating coils, 11,13 and two groups of thermocouple temperature sensors 8,9 form; Internal structure: the metallic particles induction system controlled for compressed air.
(3) metallic particles delivered inside system is made up of three parts:
1. the metallic particles tracks that metallic particles conduit entrance 7, rectilinear orbit 17, bending track 21 form
2. the metallic particles feeding control part of slide block 15, crank mechanism (crank straight-bar 22, first crank connecting link 19, second crank connecting link 23 forms), spring 18 composition
3. the power section of compressed air mouth 14, air duct 12 composition:
(1) rectilinear orbit 17 initiating terminal is compressed air mouth 14, slide block 15, air duct import 24, metallic particles conduit entrance 7 in order.Slide block 15 can be blocked or be opened air duct import 24 and metallic particles conduit entrance 7 when air push or resilience, the air that compressed air mouth 14 sprays can enter air duct 12 when air duct import 24 is opened.
(2) rectilinear orbit 17 both sides are crank mechanism and spring 18, symmetrical configuration.Crank straight-bar 22 two ends connect the first crank connecting link 19 and the second crank connecting link 23 respectively with hinge, first crank connecting link 19 is in rectilinear orbit 27 end, block metallic particles 16 to advance, second crank connecting link 23 connection sliding block 15, two ends crank connecting link all rotates also with a certain fixed pivot and metallic particles delivery head 3 body has spring 18.
(3) rectilinear orbit 16 is U-shaped bending track 21 through the first crank connecting link 19, bending track 21 Lower Half tap air duct outlet 20.It is outside that air duct 12 main body is attached to metallic particles delivery head 3, and rectilinear orbit 17 initiating terminal is led in air duct import 24, air duct outlet 20 logical bending track 21 the latter half.
(4) as shown in Figure 2, thermocouple temperature sensor two in this embodiment, is used, electromagnetic induction heating coil two, the first electromagnetic induction heating coil 13 preheated metallic particle 16 to 500 DEG C, the first thermocouple temperature sensor monitoring preheat temperature.Second electromagnetic induction heating coil 11 heating metal particles 16 to 900 DEG C-1100 DEG C, the second thermocouple temperature sensor 9 monitors final temperature.
(5), in this embodiment, metallic particles delivery head 3 and auxiliary equipment (protection air-blowing device of air etc.) thereof all use fusing point to be not less than welded blank 5, and the metal that thermal conductivity is good is made.
Step 3: control laser power, laser beam 4 irradiates welded blank 5 and forms non-penetration welding pool, opens the metallic particles induction system that compressed air controls, and pushes by the metallic particles that heats to non-penetration welding pool.
(1) in present embodiment, accurate control laser power, make laser beam 4 irradiate welded blank 5 and form non-penetration welding pool 27, pool depth is no more than the thickness 10-15mm of welded blank 5, because upper surface splashes mainly betide non-penetration weld termination process, splashing molten drop 28 flies out when welding, and is distributed in weld seam both sides.
(2) as shown in Figure 3, metallic particles delivery head 3 off working state schematic internal view.Metallic particles 16 enters in rectilinear orbit 17 by metallic particles conduit entrance 7, by slide block 15, spring 18 and crank straight-bar 22, first the crank mechanism that forms of crank connecting link 19, second crank connecting link 23 control entering and falling of metallic particles 16, second crank connecting link 23 is connected with slide block 15, and slide block 15 is responsible for driving crank mechanism motion and intercepting open metallic particles conduit entrance 7 and air duct import 20.During off working state, system is in poised state, slide block 15 non-barrier metal particle conduit entrance 7, covers air duct import 20, first crank connecting link 19 simultaneously and stops metallic particles 16 free-falling
(3) as shown in Figure 4, be metallic particles delivery head 3 duty schematic internal view.When compressed air mouth 14 starts to spray compressed air, slide block 15 starts mobile under gas pressure, the second crank connecting link 23 be connected is driven to rotate, second crank connecting link 23 to be linked the first crank connecting link 19 by crank straight-bar 22, two groups of crank connecting links drive spring 18 to be out of shape gradually, when slide block 15 move be deformed into the extreme position shown in Fig. 4 with spring 18 time, slide block 15 blocks metallic particles conduit entrance 7, metallic particles 16 stops supplementing, air duct import 20 is simultaneously opened, and compressed air enters air duct 12; First crank connecting link 19 turns to extreme position, and metallic particles 16 enters bending track 21 under gravity, is then pushed out metallic particles delivery head 3 by the compressed air of air duct outlet 20.
(4) compressed-air actuated flow is adjusted, can control flexibly to export the pushed speed of going out of 20 place's metallic particles 16 at air duct, compressed air leaves metallic particles delivery head 3 along pushing direction straight line simultaneously, can not enter in non-penetration welding pool 27, in order to avoid affect the stability in molten bath with the metallic particles 16 fallen.
(5) when welding stops, closes compression air mouth 14, the spring 18 of distortion returns to the equilbrium position shown in Fig. 3, first crank connecting link 19 and the second crank connecting link 23 are back to original position, the travelling backwards of band movable slider 15, air duct import 24 is blocked, and metallic particles conduit entrance 7 is opened, metallic particles 16 freely supplements under gravity, and the first crank connecting link 19 stops metallic particles 16 free-falling simultaneously.This system by the conveying of the GRAVITY CONTROL metallic particles of the potential energy of compressed-air actuated switch, spring, metallic particles and can be supplemented, convenient flexibly.
Step 4: open inertia protection gas ring shape gas blow pipe 10, laser welding system 1 is synchronous with metallic particles delivery head 3 moves with high-speed welding speed, completes welding process.
(1) as shown in Figure 5; inertia protection gas ring shape gas blow pipe 10 structural representation; inertia protection gas ring shape gas blow pipe 10 centered by metallic particles delivery head 3 around; its surface has symmetrical annular spilehole, annular spilehole diameter 0.5-1mm, when this device is opened; inertia protection gas blows around metallic particles 16 throughput direction annular; while protection appearance of weld, the splatter that welded blank 5 surface is fragmentary along weld seam both sides can be stoped, improve appearance of weld quality.The flow of inertia protection gas is 25L/min-35L/min, and composition is helium argon hybrid protection gas.
(2), in present embodiment, laser welding system 1 is moved with high-speed welding speed.As shown in Figure 7, myriawatt level laser welding slab high-speed welding splashing defect schematic diagram, metallic vapour 25 sprays to the opposite direction of welding direction 29, motlten metal continuously after aperture along stretching out molten bath, form the metal fluid column of inclination, metallic vapour imposes shearing force to rear along wall molten bath and metal fluid column, makes motlten metal upwards overcome surface tension and gravity and departs from molten bath and form splashing molten drop 28.
(3) as shown in Figure 8, suppress high-speed welding splashing defect schematic diagram, metallic particles 16 is admitted to the rear edge of non-penetration welding pool 27, resist metallic vapour 25 to the rear shearing force imposed along wall molten bath and metal fluid column, enhance the mobility of non-penetration welding pool 27, decrease defect odds, prevent motlten metal to overcome surface tension and gravity and move upward and depart from molten bath and form splashing molten drop 28.
Although disclose in detail the present invention with reference to accompanying drawing, it should be understood that these descriptions are only exemplary, be not used for limiting application of the present invention.Protection scope of the present invention by appended claims, and can be included in when not departing from scope and spirit for inventing various modification, remodeling and the equivalents done.
Claims (8)
1. suppress myriawatt level laser to weld a method for slab upper surface defect, its concrete steps are as follows:
Step 1: process welded blank (5), metallic particles delivery head metallic particles delivery head (3) is mounted in laser welding system (1), metallic particles (16) transfer position is on non-penetration welding pool (27) edge afterwards, and metallic particles delivery head (3) is perpendicular to welded blank (5) surface and welding direction (29);
Step 2: metallic particles (16) is loaded in metallic particles delivery head (3), opens metallic particles heater, be heated to the following temperature 900-1100 degree Celsius of metallic particles (16) fusing point;
Step 3: control laser power, laser beam (4) irradiates welded blank (5) and forms non-penetration welding pool, opens the metallic particles induction system that compressed air controls, and pushes by the metallic particles that heats to non-penetration welding pool;
Step 4: open inertia protection gas ring shape gas blow pipe (10), laser welding system (1) and metallic particles delivery head (3) synchronizing moving, complete welding process.
2. the method for suppression myriawatt level laser welding slab upper surface defect according to claim 1, it is characterized in that: metallic particles delivery head (3) is regulated by fixed support (2) with the distance of the hot spot of laser beam (4), lateral separation controls at 5-10mm, vertical range controls at 8-12mm, can be transported to welding pool aperture (26) edge afterwards with guarantee fund's metal particles (16).
3. the method for suppression myriawatt level laser welding slab upper surface defect according to claim 1, is characterized in that: metallic particles (16) is made up of di-iron trioxide mixing trace rare-earth element yttrium, and shape is spheroid, and diameter is 2-4mm.
4. the method for suppression myriawatt level laser welding slab upper surface defect according to claim 1; it is characterized in that: inertia protection gas ring shape gas blow pipe (10) is centered around metallic particles delivery head (3) end, the metallic particles heating system that two groups of electromagnetic induction heating coils (11,13) form with two groups of thermocouple temperature sensors (8,9).
5. the method for suppression myriawatt level laser welding slab upper surface defect according to claim 1, it is characterized in that: metallic particles (16) enters in rectilinear orbit (17) by metallic particles conduit entrance (7), by slide block (15), spring (18) and crank straight-bar (22), first crank connecting link (19), the crank mechanism that second crank connecting link (23) forms controls entering and falling of metallic particles (16), second crank connecting link (23) is connected with slide block (15), slide block (15) is responsible for driving crank mechanism motion and intercepting or open metallic particles conduit entrance (7) and air duct import (20).
6. the method for suppression myriawatt level laser welding slab upper surface defect according to claim 5, it is characterized in that: when compressed air mouth (14) starts to spray compressed air, slide block (15) starts mobile under gas pressure, the second crank connecting link (23) be connected is driven to rotate, second crank connecting link (23) to be linked the first crank connecting link (19) by crank straight-bar (22), two groups of crank connecting links drive spring (18) to be out of shape gradually, when slide block (15) is mobile and spring (18) is deformed into extreme position, slide block (15) blocks metallic particles conduit entrance (7), metallic particles (16) stops supplementing, air duct import (20) is opened simultaneously, compressed air enters air duct (12), first crank connecting link (19) turns to extreme position, metallic particles (16) enters bending track (21) under gravity, is then pushed out metallic particles delivery head (3) by the compressed air of air duct outlet (20).
7. the method for suppression myriawatt level laser welding slab upper surface defect according to claim 5, it is characterized in that: when welding stops, closes compression air mouth (14), first crank connecting link (19) and the second crank connecting link (23) are back to original position, band movable slider (15) travelling backwards, air duct import (24) is blocked, metallic particles conduit entrance (7) is opened, metallic particles (16) freely supplements under gravity, and the first crank connecting link (19) stops metallic particles (16) free-falling simultaneously.
8. the method for suppression myriawatt level laser welding slab upper surface defect according to claim 1; it is characterized in that: inertia protection gas ring shape gas blow pipe (10) centered by metallic particles delivery head (3) around; its surface has symmetrical annular spilehole, annular spilehole diameter 0.5-1mm.
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| CN108838904A (en) * | 2018-07-09 | 2018-11-20 | 西北工业大学 | A method of reducing structural metallic materials joint made by flame welding residual stress |
| CN109483071A (en) * | 2018-12-27 | 2019-03-19 | 长沙理工大学 | A kind of method of the big thickness plate of laser-agitating friction composite welding |
| CN109702341A (en) * | 2019-02-28 | 2019-05-03 | 湖南大学 | A kind of the buoyant gas auxiliary welding device and application method of the sealing of gas wall |
| CN110961787A (en) * | 2019-12-30 | 2020-04-07 | 长沙理工大学 | Method for laser deep fusion welding of thick plate |
| CN111085781A (en) * | 2020-03-10 | 2020-05-01 | 长沙理工大学 | Method for laser welding thick plate with assistance of gas column |
| CN111597742A (en) * | 2020-04-17 | 2020-08-28 | 扬州大学 | Agricultural machinery structure residual deformation prediction method based on welding component linkage effect |
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| CN109702341A (en) * | 2019-02-28 | 2019-05-03 | 湖南大学 | A kind of the buoyant gas auxiliary welding device and application method of the sealing of gas wall |
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| CN111597742B (en) * | 2020-04-17 | 2023-05-23 | 扬州大学 | Agricultural machinery structure residual deformation prediction method based on linkage effect of welding members |
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