CN116441708A - Laser tailor-welding method for aluminum-silicon coating hot forming steel - Google Patents
Laser tailor-welding method for aluminum-silicon coating hot forming steel Download PDFInfo
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- CN116441708A CN116441708A CN202310512468.8A CN202310512468A CN116441708A CN 116441708 A CN116441708 A CN 116441708A CN 202310512468 A CN202310512468 A CN 202310512468A CN 116441708 A CN116441708 A CN 116441708A
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- 238000003466 welding Methods 0.000 title claims abstract description 133
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 32
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000011248 coating agent Substances 0.000 title claims abstract description 27
- 238000000576 coating method Methods 0.000 title claims abstract description 27
- 239000000945 filler Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 229910000734 martensite Inorganic materials 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000011261 inert gas Substances 0.000 abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 239000010953 base metal Substances 0.000 abstract 1
- 229910001338 liquidmetal Inorganic materials 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229910018125 Al-Si Inorganic materials 0.000 description 2
- 229910018520 Al—Si Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- B23K26/125—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 of mixed gases
-
- 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
- B23K26/211—Bonding by welding with interposition of special material to facilitate connection of the parts
-
- 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
- B23K26/32—Bonding taking account of the properties of the material involved
-
- 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
- B23K26/60—Preliminary treatment
-
- 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
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides a laser welding method of aluminum-silicon coating hot forming steel, which comprises the steps of chamfering and fixing the welding side of a welded steel plate, carrying out laser filler wire welding, and enabling a welding wire to enter a welding pool in a liquid state form to form a welding joint after being melted by a laser beam; in the welding process, the welding wire liquid metal and the molten pool are both in inert gas; the welding wire comprises C, si, mn, cr, mo, co, P, S, ni, cu components, and the balance of Fe and unavoidable impurity elements. The invention realizes the direct laser filler wire welding of the aluminum-silicon hot forming steel, the welding line strength is not lower than 1500MPa, and the stretch detection breaking position of the welded joint is in the base metal.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a welding method of aluminum-silicon coating hot forming steel, and especially relates to a laser splice welding method of aluminum-silicon coating hot forming steel.
Background
The thermoformed parts are widely used in the body of automobiles, such as door rings, A columns, B columns, C columns, anti-collision beams, middle channels and other parts of automobiles. The aluminum-silicon coating hot-formed steel is widely paid attention to because the aluminum-silicon coating hot-formed steel has the characteristic of difficult oxidization in the process of producing automobile parts. The method has the problems that in the laser welding process of the aluminum-silicon hot forming steel, aluminum-silicon coating alloy elements on the surface of the steel plate enter into a welding line, and after the hot forming process, the welding line cannot be completely changed into a martensitic structure, so that the strength of the welding line is reduced, and the welding requirement of the aluminum-silicon hot forming steel cannot be met.
The prior patent CN101426612B discloses a method for manufacturing a welded blank by using an aluminum-silicon plated steel plate as a raw material and only an intermetallic compound as a precoating layer. Specifically, the aluminum alloy layer in the plating layer is removed, excessive aluminum alloy is prevented from being molten into the welding seam, and the intermetallic compound layer in the plating layer is reserved. And then welding to obtain a welding piece. The patent needs professional equipment to remove the surface coating of the steel plate, and has large implementation difficulty and poor stability.
Patent CN 106029292B discloses a method for laser welding one or more workpieces of hardenable steel at a butt joint. This patent improves weld performance by filling the weld with welding wire, and requires that one or more workpieces of the welded test panel be uncoated or partially uncoated. The patent is difficult to implement, and the surface coating of the steel plate needs to be removed, and the welding wire and the steel plate have a proportional relation of alloy components.
Therefore, a new welding method is needed to solve the problem of low weld strength caused by direct welding of the aluminum-silicon coated steel plates.
Disclosure of Invention
According to the technical problems, the laser tailor-welding method for the aluminum-silicon coating hot forming steel is provided. The invention designs a brand new welding wire, and can directly weld the aluminum-silicon plated steel plate by combining the welding wire component design and the welding process, and after the hot forming process, the weld joint structure is mainly a martensitic structure, the joint strength is greater than the steel plate strength, and the laser welding requirement of the hot formed steel is completely met.
The invention adopts the following technical means:
a laser splice welding method for the hot forming steel with Al-Si coating includes fixing the steel plate to be welded, and laser filling welding under laser beam to form welded joint. Inert gas is adopted for protection in the welding process; the inert gas is argon or helium or a mixed gas of the argon and the helium. Before the welded steel plates are fixed, a groove with the angle of 1-80 degrees is processed on the welding side of at least one of the two welded steel plates, the size of the blunt edge is 0-90% of the thickness of the welded steel plates, and the thickness of the welded steel plates is equal to that of the thin plates. When the laser filler wire is welded, the welding wire is melted by the laser beam and then enters a welding pool in a liquid state to form a welding joint, and the welding joint structure is a martensitic structure.
The welding wire comprises the following components in percentage by mass: c:0.10 to 0.25 percent; si:0.20 to 0.50 percent; mn:1.20 to 2.00 percent; cr: 0.40-1.00%; mo:0.30 to 1.20 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent, ni:2.00 to 10.0 percent, co:0.1 to 10.0 percent, cu:0.15 to 0.45 percent, wherein C+Ni+Co is more than or equal to 6, cr+Mo is less than or equal to 2, and the balance is Fe and unavoidable impurity elements.
The welding wire may further include B: 0.002-0.005%; v:0 to 0.15 percent; ti:0 to 0.4% of one or more of the following components.
The diameter of the welding wire is 0.8-1.2 mm, and copper is plated on the surface of the welding wire.
The thickness of the welded steel plate is 0.5 mm-3.0 mm.
At least one of the two welded steel plates is provided with an aluminum silicon coating, the aluminum silicon coating is an aluminum or aluminum alloy coating, and the weight of the single-sided aluminum silicon coating of the welded steel plate is less than or equal to 80g/m 2 。
At least one welding side of two steel plates to be welded is provided with a groove of 1-80 degrees; the grooves can be processed on one side or on both sides, the shape of the grooves is not limited, and any shape can be adopted. And during welding, welding wire melting is used for supplementing weld metal, so that a full welding joint is obtained, the welding wire metal is used for improving the strength of the weld joint, and high-temperature ferrite is restrained from being generated in the weld joint.
And heating the welded joint to 950-970 ℃, then putting the welded joint into a die with a cooling system for stamping, wherein the cooling speed of the die is more than or equal to 30 ℃/s, and the tensile strength of the welded joint is more than or equal to 1500MPa.
The effect and the purpose of each component design in the welding wire are as follows:
c: the strength of the welding seam is improved, the hardenability of the welding seam metal is improved, the austenite phase region can be enlarged, and high-temperature ferrite is avoided. The C content is less than 0.10 percent, the welding strength is low, and high-temperature ferrite tissues are easy to generate in weld metal. When the C content is higher than 0.25%, the strength of the welding wire is high, and the welding wire production is finished through multiple annealing procedures, so that the production cost is high. Comprehensively considering that the mass percentage of the C element is designed to be 0.10-0.25 percent.
Si, mn: has the functions of improving the strength of the welding seam and deoxidizing the welding seam. The sufficient deoxidization of the weld metal can effectively reduce the precipitation of two-phase particles, and the probability of wire breakage during the drawing of the welding wire is reduced. And meanwhile, the occurrence of weld defects is reduced. Comprehensively considering that the Si content of the welding wire is controlled between 0.20 and 0.50 percent and the Mn content is controlled between 1.20 and 2.00 percent.
P, S is a harmful element, the lower the content in the welding wire is, the better, but the smelting cost of deep P and S removal is higher, and the welding wire P of the invention is comprehensively considered: less than or equal to 0.020%; s: less than or equal to 0.015 percent.
Cr and Mo are elements capable of increasing the hardenability of steel and improving the strength of a weld joint. The low content cannot ensure that the weld joint forms a martensitic structure in quenching. The content of the high-hardness welding wire is high, which is unfavorable for the production and manufacture of the welding wire. Meanwhile, cr promotes the formation of ferrite structure, and reduces the strength of the welding seam. When Cr+Mo is less than or equal to 2, the welding wire is ensured to have higher hardenability, and in the hot forming process, the welding seam can be quenched to form a martensitic structure, and the welding wire can be kept to have better ductility, so that the wire is not easy to break during drawing production. Comprehensively considering that the content of Cr is controlled to be 0.40-1.00 percent and the content of Mo is controlled to be 0.30-1.20 percent.
Ni, co: the element for stabilizing austenite can enlarge the austenite phase region and inhibit the formation of high-temperature ferrite in the weld metal. When C+Ni+Co is more than or equal to 6, the weld metal firstly forms an austenite structure when being converted from a liquid state to a solid state, and then the structure is converted into a martensite structure, so that the formation of high-temperature ferrite in the weld can be effectively inhibited. Ni can also improve the plasticity and toughness of the welding seam and increase the corrosion resistance of the welding seam. Comprehensively consider the welding wire Ni: 2.00-10.0%, co:0.1 to 10.0 percent.
V has refined grains in the welding wire, and improves the strength without reducing the toughness of the welding seam. Can form a precipitated phase with C, N in steel, inhibit the growth of austenite grains, reduce failure sensitivity and cold brittleness, and improve welding performance. The large amount of precipitated phases directly influence the drawing performance of the welding wire, and lead to the drawing breakage of the welding wire. Therefore, the invention adopts V:0 to 0.15 percent.
B is an element for strongly improving the hardenability of steel, and trace B can obviously improve the hardenability of the steel plate. When the content of B is too high, a large number of twin crystal defects are easy to occur in the welding line, and the strength and plasticity of the welding line are reduced, so that the invention adopts B: 0.002-0.005%.
Cu can improve the strength and toughness of the welding seam, the plasticity is obviously reduced when the content is too high, and thermal brittleness is easy to generate when welding wires are produced. Comprehensively consider Cu:0.15 to 0.45 percent.
Ti can inhibit austenite grain growth in the heating process and improve the weld strength. Excessive addition is easy to form second phase particles, and the manufacture of the welding wire is affected. Comprehensively consider Ti:0 to 0.4 percent.
Compared with the prior art, the invention has the following advantages:
1. the invention realizes the direct laser filler wire welding of the aluminum-silicon hot forming steel, the welding line strength is not lower than 1500MPa, the welding line structure is a martensitic structure, and the stretching detection breaking position of the welding joint is in the base material.
2. The welding scheme combining the beveling of the steel plate and the laser filler wire welding effectively increases the filler quantity of the welding wire and realizes the high-strength characteristic of the welding seam.
3. The welding wire composition system is simple, the production difficulty is low, and the existing welding wire equipment can be utilized for production and manufacture.
4. The invention can be applied to the existing laser splice welding equipment without equipment transformation.
5. The method according to the invention allows welding between different materials, different grades, different thicknesses of the combined materials.
For the reasons, the invention can be widely popularized in the fields of aluminum-silicon coating hot forming steel welding and the like.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The described embodiments are only some, but not all, embodiments of the invention. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A laser splice welding method for the hot forming steel with Al-Si coating includes fixing the steel plate to be welded, and laser filling welding under laser beam to form welded joint. Inert gas is adopted for protection in the welding process; the inert gas is argon or helium or a mixed gas of the argon and the helium. And a groove with the angle of 1-80 degrees is processed on the welding side of the welded steel plate, and the size of the blunt edge is 0-90% of the thickness of the welded steel plate.
The welding wire comprises the following components in percentage by mass: c:0.10 to 0.25 percent; si:0.20 to 0.50 percent; mn:1.20 to 2.00 percent; cr: 0.40-1.00%; mo:0.30 to 1.20 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent, ni:2.00 to 10.0 percent, co:0.1 to 10.0 percent, cu:0.15 to 0.45 percent, wherein C+Ni+Co is more than or equal to 6, cr+Mo is less than or equal to 2, and the balance is Fe and unavoidable impurity elements.
The welding wire may further include B: 0.002-0.005%; v:0 to 0.15 percent; ti:0 to 0.4% of one or more of the following components.
The diameter of the welding wire is 0.8-1.2 mm, and copper is plated on the surface of the welding wire.
The thickness of the welded steel plate is 0.5 mm-3.0 mm.
At least one of the two welded steel plates is provided with an aluminum silicon coating, the aluminum silicon coating is an aluminum or aluminum alloy coating, and the weight of the single-sided aluminum silicon coating of the welded steel plate is less than or equal to 80g/m 2 。
And a groove with the angle of 1-80 degrees is processed on the welding side of at least one of the two welded steel plates, the size of the blunt edge is 0-90% of the thickness of the welded steel plate, and the thickness of the welded steel plate is equal to that of a thin plate for different thick plates. The groove can be machined on one side or on both sides. And during welding, the welding wire is melted to supplement weld metal, so that a full welding joint is obtained.
And heating the welded joint to 950-970 ℃, then putting the welded joint into a die with a cooling system for stamping, wherein the cooling speed of the die is more than or equal to 30 ℃/s, and the tensile strength of the welded joint is more than or equal to 1500MPa.
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description of the invention in connection with the specific embodiments.
The steel plate was subjected to laser splice welding using a fiber laser, the dimensions and the coating of the steel plate are shown in Table 1, and the composition of the welding wire is shown in Table 2. In the welding process, 99.99% argon is adopted for welding pool and molten drop protection, and the gas flow is 25L/min. The two welded steel plates are butted and fixed by a fixture. Steel plate hot forming process system: and heating the welding plate in a heating furnace to 950 ℃ and preserving heat for 5min, taking out the welding plate after the time is up, putting the welding plate into a thermoforming mold for quenching, taking out the welding plate after cooling for weld strength detection, and the detection results are shown in table 3.
Table 1 steel plate ruler and plating quality
TABLE 2 chemical composition (wt%) of welding wire
| C | Si | Mn | P | S | Cr | Mo | Co | V | B | Ni | Cu | |
| Example 1 | 0.10 | 0.35 | 1.64 | 0.014 | 0.005 | 0.40 | 0.55 | 1.76 | 0.06 | 0.003 | 5.45 | 0.15 |
| Example 2 | 0.16 | 0.42 | 1.47 | 0.015 | 0.006 | 0.61 | 0.35 | 0.50 | 0.11 | 6.10 | 0.24 | |
| Example 3 | 0.13 | 0.30 | 1.82 | 0.009 | 0.007 | 0.45 | 0.72 | 3.25 | 4.26 | 0.18 | ||
| Example 4 | 0.21 | 0.46 | 1.26 | 0.015 | 0.010 | 0.57 | 0.30 | 8.58 | 0.05 | 0.002 | 2.79 | 0.23 |
| Example 5 | 0.25 | 0.20 | 1.53 | 0.014 | 0.005 | 0.86 | 1.10 | 4.12 | 0.15 | 9.98 | 0.32 | |
| Example 6 | 0.17 | 0.24 | 1.95 | 0.013 | 0.006 | 0.95 | 1.01 | 2.49 | 8.27 | 0.29 | ||
| Comparative example 1 | 0.12 | 0.81 | 1.78 | 0.006 | 0.007 | 0.47 | 0.55 | 2.18 | 0.15 | |||
| Comparative example 2 | 0.14 | 075 | 1.56 | 0.013 | 0.010 | 0.35 | 0.47 | 0.05 | 3.14 | 0.11 |
TABLE 3 mechanical Properties of laser tailor welded blanks
As is clear from Table 3, the weld strength was not lower than 1500MPa, the weld joint elongation detection fracture position was in the base material, and the structure after the weld joint hot forming process treatment was martensitic.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. The laser splice welding method of the aluminum-silicon coating hot forming steel is characterized by comprising the steps of fixing a welded steel plate, and performing laser filler wire welding under a laser beam to form a welded joint; before the welded steel plates are fixed, a groove with the angle of 1-80 degrees is processed on the welding side of at least one of the two welded steel plates, and the size of the blunt edge is 0-90% of the thickness of the welded steel plates; when the laser filler wire is welded, the welding wire is melted by a laser beam and then enters a welding pool in a liquid state to form a welding joint, and the welding joint structure is a martensitic structure;
the welding wire comprises the following components in percentage by mass: c:0.10 to 0.25 percent; si:0.20 to 0.50 percent; mn:1.20 to 2.00 percent; cr: 0.40-1.00%; mo:0.30 to 1.20 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent, ni:2.00 to 10.0 percent, co:0.1 to 10.0 percent, cu:0.15 to 0.45 percent, wherein C+Ni+Co is more than or equal to 6, cr+Mo is less than or equal to 2, and the balance is Fe and unavoidable impurity elements.
2. The method of laser tailor-welding an aluminum-silicon plated hot formed steel according to claim 1, wherein the welding wire further comprises B: 0.002-0.005%; v:0 to 0.15 percent; ti:0 to 0.4% of one or more of the following components.
3. The laser splice welding method for aluminum-silicon plated hot formed steel according to claim 1, wherein the thickness of the welded steel plate is 0.5 mm-3.0 mm.
4. The laser splice welding method for aluminum-silicon coating hot forming steel according to claim 1, wherein the welding joint is heated to 950-970 ℃, then is put into a die with a cooling system for stamping and cooling, the cooling speed is more than or equal to 30 ℃/s, and the tensile strength of the welding joint is more than or equal to 1500MPa.
5. The laser splice welding method for aluminum-silicon plated hot formed steel according to claim 1, wherein at least one of the two welded steel platesThe single-sided aluminum silicon coating of the welded steel plate has the weight of less than or equal to 80g/m 2 。
6. The laser splice welding method for aluminum-silicon coating hot forming steel according to claim 1, wherein the diameter of the welding wire is 0.8-1.2 mm, and the surface of the welding wire is plated with copper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310512468.8A CN116441708A (en) | 2023-05-09 | 2023-05-09 | Laser tailor-welding method for aluminum-silicon coating hot forming steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310512468.8A CN116441708A (en) | 2023-05-09 | 2023-05-09 | Laser tailor-welding method for aluminum-silicon coating hot forming steel |
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| CN116441708A true CN116441708A (en) | 2023-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310512468.8A Pending CN116441708A (en) | 2023-05-09 | 2023-05-09 | Laser tailor-welding method for aluminum-silicon coating hot forming steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116441708A (en) |
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2023
- 2023-05-09 CN CN202310512468.8A patent/CN116441708A/en active Pending
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