CN105108341A - Laser-MAG welding method for steel plate of medium thickness and superhigh strength - Google Patents
Laser-MAG welding method for steel plate of medium thickness and superhigh strength Download PDFInfo
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- CN105108341A CN105108341A CN201510649015.5A CN201510649015A CN105108341A CN 105108341 A CN105108341 A CN 105108341A CN 201510649015 A CN201510649015 A CN 201510649015A CN 105108341 A CN105108341 A CN 105108341A
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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
- B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
- B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding
Abstract
The invention relates to a laser-MAG welding method for a steel plate of medium thickness and superhigh strength and aims at solving problems existing in steel plates of medium thickness and superhigh strength in the laser-MAG composite welding. The method comprises the following steps: 1, before welding, fixing a machining clamp to a position to be welded of a workpiece to be welded; 2, rigidly fixing a laser head and an MAG welding gun; 3, setting welding parameters; 4, adopting a robot integrated system for controlling the welding parameters, wherein firstly, an MAG electric arc is generated, after the electric arc is stabilized for 1-2 seconds, a laser device is controlled to emit laser, and finally a robot is controlled so that the laser working head and the MAG welding gun can move jointly to complete the welding process. The welding method is applied to the field of material processing engineering.
Description
Technical field
The present invention relates to thick ultra-high strength steel plate laser-MAG welding method in one, belong to materials processing engineering field.
Background technology
Along with the development of aircraft industry, general structural steel can not meet the needs of important component, and unimach arises at the historic moment.The tensile strength of usual unimach is higher than 1400MPa, and toughness is better, and combination property is given prominence to.In recent years, super-high strength steel, especially the strong cut deal of superelevation (thickness G reatT.GreaT.GT8mm) is applied more and more extensive in space flight and aviation and weapon field.The subject matter of ultra-high tensile steel welding comprises: cold crack, heat affected zone embrittlement and softening.Mainly its tendency of hardenability is very large in the generation of cold crack, the effect of welding tension and diffusible hydrogen.
And in the welding of thick ultrahigh-strength steel plates, at present TIG weldering or the electron-bombardment welding of adopting more, but usually need weld preheating and post weld heat treatment, avoid cold crack, intensity suitably high and target that toughness is good to reach.But TIG welding efficiency is low, needs multilayer welding, and welding deformation is large; The cost of electron beam welding own is higher, and needs vacuum welding environment, the application of thick ultra-high strength steel plate in also significantly limit.
Laser-arc hybrid welding in industry is in the phase at the end of the seventies in last century, is proposed at first and carry out testing by British scholar W.M.Steen.Laser and electric arc two kinds of thermals source combine by it, overcome the deficiency of single heat source, thus obtain the effect of energization utilization rate, raising welding process stability.Adopt the laser-arc hybrid welding, have that speed of welding is fast, weld penetration is large, heat input is low, be out of shape the advantages such as little, thus reach the effect of low cost, high efficiency, high-adaptability.Existing report laser-MAG compound welding technology being applied to the strong cut deal welding of superelevation at present, patent 201210039761 discloses a kind of laser-MAG compound welding method of or super-high strength steel welding high-strength for slab, it achieves the high-speed welding of high strength steel plate, but need preheating before weldering, add the overall time of welding, patent 200810223741.0 discloses a kind of high-strength or super-high strength steel laser one electrical arc composite heat source welding method, solve the problem of weld preheating, but its speed of welding is restricted.
At present, thick high strength steel plate (thickness G reatT.GreaT.GT8mm) in the electric arc combined welding of laser-MAG is adopted to there are following problems:
(1) when adopting laser-MAG only once to weld, require larger to composite welding weld penetration, the demand of laser power is higher, increase the cost of laser instrument, and when laser power is very large, the reaction force of laser plasma seriously can hinder the MAG droplet transfer, and cause MAG droplet transfer difficulty, the droplet transfer is unstable;
(2) when employing laser-MAG compound welding carries out bottoming welding, then MAG weldering is adopted to carry out then adding when filling welding the overall time of welding;
Summary of the invention
The object of the invention is to for ultra-high strength steel plate Problems existing thick in laser-MAG compound welding, propose a kind of new method-in thick ultra-high strength steel plate laser-MAG compound welding method.
Thick ultra-high strength steel plate laser-MAG welding method in one of the present invention, other carries out according to following steps:
One, before welding, the position to be welded of workpiece to be welded is processed into two V-shaped groove, two u groove, double-Y shaped groove or the double-U-shaped groove of band root face, and the double groove after processing and both side surface are polished or cleaned, the workpiece to be welded after polishing or cleaning is fixed on welding tool setup;
Two, laser head and MAG welding gun are rigidly fixed;
Three, welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 3000 ~ 5000W, and arc current is 100 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 50 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 400 ~ 700W, and arc current is 200 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 50 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min;
Four, adopt robot integrated system to control welding condition, first MAG Arc, after arc stability 1 ~ 2S, then laser control sends laser, and last control makes laser work head and MAG welding gun associated movement complete welding process.
The present invention is intended to thick high strength steel plate in welding, adopts the method for laser-MAG welding, carries out backing welding with filling to weld two-layer welding and obtain satisfactory weld seam, and its schematic diagram as shown in Figure 1.
In backing welding, adopt the two thermal source composite welding of laser-MAG, following two features are mainly contained: one compared to general laser-MAG compound welding. laser and MAG electric arc spacing d should be greater than the General Requirements of 2-3mm, increase to 5-6mm, d increases, the coupling of laser and electric arc can be reduced on the one hand to a certain extent, improve the stability of welding process, reduce the inhibition of reaction force for the MAG droplet transfer of laser plasma, promote the droplet transfer, on the other hand, it expands the area in molten bath, reduce the cooling velocity in molten bath, add cool time, reduce crackle tendency during high-strength steel welding, two .MAG shielding gas flow amounts are greater than 35L/min, large shielding gas flow amount at utmost can dispel laser plasma on the one hand, reduce the loss of plasma for laser power, maximum welding penetration is obtained under equal laser power, on the other hand, large shielding gas flow amount can promote the MAG droplet transfer, and make welding process keep jet or project transfer pattern, welding process is stablized.
In filling weldering, adopt the method for laser assisted MAG welding, composite welding head can be kept constant, but reduce laser-arc spacing, reduce shielding gas flow amount, and reduce laser power to being less than 800W, now, laser does not form keyhole in welding process, welding process is played a leading role by MAG, the effect of laser is following three aspects: one. to the preheating that workpiece carries out to a certain degree, reduce the possibility that weld defect produces, two. by laser to the attraction of MAG electric arc and stabilization, even if make in filling weldering, when MAG electric current is very large, also good welding stability can be kept, three. because electric arc arc column is compressed, cause arc energy more concentrated.In addition due to the heat radiation effect of laser photo plasma, the surface tension coefficient of molten drop is reduced, surface tension can be made to reduce, thus advantageously in the refinement of molten drop, facilitate the transition of molten drop.
The present invention mainly contains some advantage following compared to the welding of traditional laser-MAG high-strength steel cut deal:
1, two-layer welding, reduces the thickness requirement of a through welding plate, reduces the peak power requirement of laser instrument, reduces cost, and reduces heat input by two-layer welding integral, reduces the possibility that defect occurs;
2, increase chevilled silk spacing, in backing welding, add the time of staying in molten bath, increase shielding gas flow amount, make use of laser energy as much as possible;
3, in filling weldering, adopt laser assisted MAG to weld, namely improve welding quality and turn reduce the time changing MAG welding gun.
Accompanying drawing explanation
Fig. 1 is that laser-MAG of the present invention welds schematic diagram;
Fig. 2 is the weld seam front pattern Electronic Speculum figure that embodiment 1 carries out when bottoming is welded;
Fig. 3 is the weld root pattern Electronic Speculum figure that embodiment 1 carries out when bottoming is welded;
Fig. 4 is the section of weld joint metallographic shape appearance figure that embodiment 1 carries out when bottoming is welded;
Fig. 5 is the weld seam front pattern Electronic Speculum figure that embodiment 1 carries out when filling welding;
Fig. 6 is the section of weld joint metallographic shape appearance figure that embodiment 1 carries out when filling welding;
Fig. 7 is the weld seam front pattern Electronic Speculum figure of embodiment 2 laser-MAG compound welding when once welding the thick D406A super-high strength steel of 10mm;
Fig. 8 is the weld root pattern Electronic Speculum figure of embodiment 2 laser-MAG compound welding when once welding the thick D406A super-high strength steel of 10mm;
Fig. 9 is the section of weld joint metallographic shape appearance figure of embodiment 2 laser-MAG compound welding when once welding the thick D406A super-high strength steel of 10mm.
Detailed description of the invention
Detailed description of the invention one: thick ultra-high strength steel plate laser-MAG welding method in the one of present embodiment, other carries out according to following steps:
One, before welding, the position to be welded of workpiece to be welded is processed into two V-shaped groove, two u groove, double-Y shaped groove or the double-U-shaped groove of band root face, and the double groove after processing and both side surface are polished or cleaned, the workpiece to be welded after polishing or cleaning is fixed on welding tool setup;
Two, laser head and MAG welding gun are rigidly fixed;
Three, welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 3000 ~ 5000W, and arc current is 100 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 50 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 400 ~ 700W, and arc current is 200 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 50 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min;
Five, adopt robot integrated system to control welding condition, first MAG Arc, after arc stability 1 ~ 2S, then laser control sends laser, and last control makes laser work head and MAG welding gun associated movement complete welding process.
Detailed description of the invention two: present embodiment and detailed description of the invention one unlike: laser instrument is CO
2gas laser, YAG solid state laser or semiconductor laser.Other is identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment and detailed description of the invention one unlike: MAG adopts FroniusTPS4000 type MAG arc welder and optical-fiber laser-MAG composite welding head device.Other is identical with detailed description of the invention one.
Detailed description of the invention four: present embodiment and detailed description of the invention one unlike: welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000 ~ 5000W, and arc current is 120 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 100 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500 ~ 700W, and arc current is 250 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 100 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.Other is identical with detailed description of the invention one.
Detailed description of the invention five: present embodiment and detailed description of the invention one unlike: welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000 ~ 5000W, and arc current is 150 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 200 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500 ~ 700W, and arc current is 300 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 200 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.Other is identical with detailed description of the invention one.
Detailed description of the invention six: present embodiment and detailed description of the invention one unlike: welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000 ~ 5000W, and arc current is 180 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 600 ~ 700W, and arc current is 350 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.Other is identical with detailed description of the invention one.
Detailed description of the invention seven: present embodiment and detailed description of the invention one unlike: welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4500W, and arc current is 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 400mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500W, and arc current is 350A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 400mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.Other is identical with detailed description of the invention one.
Detailed description of the invention eight: present embodiment and detailed description of the invention one unlike: welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4600W, and arc current is 150A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500W, and arc current is 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.Other is identical with detailed description of the invention one.
Detailed description of the invention nine: present embodiment and detailed description of the invention one unlike: welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000W, and arc current is 100A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500W, and arc current is 360A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.Other is identical with detailed description of the invention one.
Detailed description of the invention ten: present embodiment and detailed description of the invention one unlike: welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4600W, and arc current is 120A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 600W, and arc current is 380A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.Other is identical with detailed description of the invention one.
Content of the present invention is not limited only to the content of the respective embodiments described above, and the combination of one of them or several detailed description of the invention equally also can realize the object of inventing.
Beneficial effect of the present invention is verified by following examples:
Embodiment 1
By the present embodiment to two-layer 10mm thick D406A super-high strength steel with to carry out weldering comparative analysis with the disposable 10mm of welding of laser-MAG compound welding thick D406A super-high strength steel as follows:
The method that the present embodiment welds two-layer 10mm thick D406A super-high strength steel is as follows:
Step one: before welding, according to thickness of slab, is processed into double V-groove by the position to be welded of workpiece to be welded, root face height is 5mm, root face angle is 30 °, and polishes to the groove after processing and both side surface or clean, and is fixed on welding tool setup by the workpiece to be welded after polishing or cleaning;
Step 2: utilize special fixture laser head and MAG welding gun to be rigidly fixed;
Step 3: welding condition is set:
Backing welding: defocusing amount is 0mm, laser power 4600W, arc current at 140A, laser-arc spacing 6mm, speed of welding 300mm/min, protection gas adopts Ar gas, and flow is at 40L/min;
Fill weldering: defocusing amount is 0mm, laser power 400W, arc current 300A, and laser-arc spacing 2mm, speed of welding is at 300mm/min.Protection gas adopts Ar gas, and flow is at 25L/min;
Step 4: in actual welding process, robot integrated system is adopted to control welding condition, first MAG Arc, then after arc stability 1 ~ 2S, then laser control sends laser, and last control makes laser work head and MAG welding gun associated movement complete welding process.
Fig. 2 ~ 4 be respectively adopt the present embodiment carry out bottoming welding time weld seam positive and negative pattern and cross section metallographic pattern, can find out when adopting this method to carry out backing welding, can the root face of a through welding 5mm, and welding process is stablized, droplet transfer behavior is good, smooth attractive in appearance, the uniformity of appearance of weld, without obvious bad defect.
Fig. 5 ~ 6 are respectively and adopt the present embodiment to carry out filling weld seam front pattern when welding and cross section metallographic pattern, can find out, welding process is stablized, and droplet transfer behavior is good, weld seam telogenesis shape continuous uniform, weld seam is inner without defects such as incomplete fusion, lack of penetration, crackles.
Embodiment 2
The method that laser-MAG compound welding once welds 10mm thick D406A super-high strength steel is as follows:
Step one: before welding, according to thickness of slab, is processed into double V-groove by the position to be welded of workpiece to be welded, root face height is 5mm, root face angle is 30 °, and polishes to the groove after processing and both side surface or clean, and is fixed on welding tool setup by the workpiece to be welded after polishing or cleaning;
Step 2: utilize special fixture laser head and MAG welding gun to be rigidly fixed;
Step 3: welding condition is set: defocusing amount is 0mm, laser power 4600W, arc current at 240A, laser-arc spacing 2mm, speed of welding 300mm/min.Protection gas adopts Ar gas, and flow is at 30L/min.
Step 4: in actual welding process, robot integrated system is adopted to control welding condition, first MAG Arc, then after arc stability 1 ~ 2S, then laser control sends laser, and last control makes laser work head and MAG welding gun associated movement complete welding process.
Fig. 7 ~ 9 are respectively weld seam positive and negative pattern when adopting laser-MAG compound welding once to weld the thick D406A super-high strength steel of 10mm and cross section metallographic pattern, and can find, appearance of weld continuity is poor, surface is stayed, and causes undercut, and back side penetration is excessive, form overlap, welding effect is bad.
Claims (10)
1. a thick ultra-high strength steel plate laser-MAG welding method in, is characterized in that it carries out according to following steps:
One, before welding, the position to be welded of workpiece to be welded is processed into two V-shaped groove, two u groove, double-Y shaped groove or the double-U-shaped groove of band root face, and the double groove after processing and both side surface are polished or cleaned, the workpiece to be welded after polishing or cleaning is fixed on welding tool setup;
Two, laser head and MAG welding gun are rigidly fixed;
Three, welding condition is set:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 3000 ~ 5000W, and arc current is 100 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 50 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 400 ~ 700W, and arc current is 200 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 50 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min;
Four, adopt robot integrated system to control welding condition, first MAG Arc, after arc stability 1 ~ 2S, then laser control sends laser, and last control makes laser work head and MAG welding gun associated movement complete welding process.
2. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 1, is characterized in that laser instrument is CO
2gas laser, YAG solid state laser or semiconductor laser.
3. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 1, is characterized in that MAG adopts FroniusTPS4000 type MAG arc welder or optical-fiber laser-MAG composite welding head device.
4. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 1, is characterized in that arranging welding condition:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000 ~ 5000W, and arc current is 120 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 100 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500 ~ 700W, and arc current is 250 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 100 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.
5. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 4, is characterized in that arranging welding condition:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000 ~ 5000W, and arc current is 150 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 200 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500 ~ 700W, and arc current is 300 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 200 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.
6. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 5, is characterized in that arranging welding condition:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000 ~ 5000W, and arc current is 180 ~ 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 600 ~ 700W, and arc current is 350 ~ 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300 ~ 500mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.
7. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 6, is characterized in that arranging welding condition:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4500W, and arc current is 200A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 400mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500W, and arc current is 350A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 400mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.
8. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 1, is characterized in that arranging welding condition:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4600W, and arc current is 150A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500W, and arc current is 400A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.
9. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 1, is characterized in that arranging welding condition:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4000W, and arc current is 100A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 500W, and arc current is 360A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.
10. thick ultra-high strength steel plate laser-MAG welding method in one according to claim 1, is characterized in that arranging welding condition:
Backing welding: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 4600W, and arc current is 120A, and laser-arc spacing is 5 ~ 6mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 30 ~ 40L/min;
Fill weldering: defocusing amount is ﹣ 3 ~ ﹢ 3mm, and laser power is 600W, and arc current is 380A, and laser-arc spacing is 2 ~ 3mm, and speed of welding is 300mm/min, protection gas adopts Ar gas, and shielding gas flow amount is 20 ~ 30L/min.
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