CN116551178A - Laser filler wire welding method suitable for 1500 MPa-level non-coating hot forming steel - Google Patents
Laser filler wire welding method suitable for 1500 MPa-level non-coating hot forming steel Download PDFInfo
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- CN116551178A CN116551178A CN202310512591.XA CN202310512591A CN116551178A CN 116551178 A CN116551178 A CN 116551178A CN 202310512591 A CN202310512591 A CN 202310512591A CN 116551178 A CN116551178 A CN 116551178A
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- 238000003466 welding Methods 0.000 title claims abstract description 200
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000000945 filler Substances 0.000 title claims abstract description 14
- 239000011248 coating agent Substances 0.000 title claims abstract description 12
- 238000000576 coating method Methods 0.000 title claims abstract description 12
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 24
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 9
- 238000003856 thermoforming Methods 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 238000007747 plating Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 238000010791 quenching Methods 0.000 description 10
- 230000000171 quenching effect Effects 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- 239000010949 copper Substances 0.000 description 8
- 238000011049 filling Methods 0.000 description 8
- 210000001503 joint Anatomy 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 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
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 238000007670 refining Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- B23K26/20—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
- B23K26/12—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
-
- 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
- B23K26/70—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a laser filler wire welding method suitable for 1500 MPa-level non-coating hot forming steel, which comprises the steps of adding welding wires into a welding pool for laser welding to form welding seams; the welding wire is a hardenable welding wire, and comprises one or more of C0.04-0.20, si 0.30-0.90, mn 1.00-1.50, mo 0.40-1.00, ni 0.20-1.0, W0.1-1.0, P less than or equal to 0.020, S less than or equal to 0.015, and V, ti, B, nb, and the balance of Fe and unavoidable impurity elements. The weld joint structure is a martensitic structure, and the tensile strength after heat treatment is not lower than 1500MPa.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a 1500 MPa-level non-coating hot-forming steel welding method, and especially relates to a laser filler wire welding method suitable for 1500 MPa-level non-coating hot-forming steel.
Background
The hot forming steel is applied to the automobile body of the automobile, so that the weight reduction problem of the automobile body can be solved, the strength of the automobile body can be improved, and the safety of the automobile body can be improved. At present, a plurality of steel plates forming the door ring are spliced together to form the door ring by a laser splice welding process method by using hot forming parts with larger application amount, such as the door ring and other parts. After welding, the workpiece is subjected to a thermoforming process, and the workpiece is quenched in a die to form a thermoformed part taking martensite as a main structure. During this process, the weld also undergoes a thermoforming process and the welded joint undergoes an austenitic to martensitic transformation in the mold. Therefore, the structure of the whole workpiece is a high-strength structure mainly comprising a martensitic structure. Because laser welding belongs to deep-melting welding, laser melts the butt joint part of the workpiece to form a molten pool, and a welding line is formed in the subsequent cooling process. Because of factors such as low workpiece butt joint precision, laser burning loss and the like, the actual weld plumpness is lower than the surface of the steel plate. The welding seam becomes the stress concentration position of the whole workpiece, so that a crack source is easily formed by stress concentration, and the welding seam is easily broken in the use process of the part, thereby causing the failure of the part. Meanwhile, the welding seam is not full and the like, so that the welding seam and a die can not be in punching contact in the thermoforming process, and the cooling is carried outInsufficient speed is easy to generate insufficient quenching condition, so that the strength of the welding line is low, and the research of parts cannot be satisfied. After the traditional MIG or MAG welding wire is used for laser filler wire welding, the weld joint can not realize a complete martensitic weld joint after hot forming heating and quenching, so that the weld joint has low strength and does not meet the hot forming welding requirement. Such as welding wire for laser welding of Al-Si coated plate formed by hot stamping in the prior patent CN 111390425B and a welding method. The patent welding wire is designed mainly for laser splice welding of an AL-Si coating hot stamping forming plate, and the welding wire contains 6% of noble metal element Ni, so that the production cost is extremely high. The prior patent CN 103331529B discloses a mixed gas shielded welding wire with tensile strength more than or equal to 1100MPa and a use method thereof. The welding wire is welded by adopting a direct current power supply reverse connection method and adopts 80 percent Ar+20 percent CO 2 And the mixed gas is used for shielded welding, so that the tensile strength of the welding seam is more than or equal to 1100MPa. However, the laser welding is not suitable for laser filler wire welding because no direct current power supply is adopted and 100% Ar protection is adopted. Meanwhile, the welding wire has complex components, high alloy content and high manufacturing requirement on smelting of the welding wire.
In order to solve the problems, a brand new welding wire for non-coating hot forming steel is needed, and the welding wire has stronger quenching performance and completely meets the welding requirement of laser welding of the hot forming steel. And a new welding method is needed in the welding process of the welding wire, so that the joint strength of the non-coating hot-formed cold-rolled sheet after welding is more than 800MPa, and after the hot forming process, the welding seam can be quenched to obtain a complete martensitic structure, and the welding joint strength is more than 1500MPa.
Disclosure of Invention
According to the technical problems, the laser filler wire welding method for the non-coating hot forming steel at the level of 1500MPa is provided, the joint strength after welding is more than or equal to 800MPa, and the weld strength after heating and quenching is more than or equal to 1500MPa.
The invention adopts the following technical means:
a laser filler wire welding method suitable for 1500MPa grade non-coating hot forming steel comprises the following steps:
the welding sides of the two test plates are butted and fixed by a fixture, the gap between the two test plates is 0-0.2 mm, welding wires are added into a welding pool for laser welding to form a welding line, and the welding pool is protected by inert gas; the welding wire is melted by the laser beam and then enters a welding pool in a liquid state, the molten metal of the welding wire and the molten metal of the test plate are fused together to form the welding seam, and a metal structure in the welding seam is a martensitic structure; the laser welding of the patent ensures that the weld joint is in full contact with the die in the thermoforming process, and weld joint metal is not lower than the surface of the test plate.
The welding wire is a hardenable welding wire, and comprises the following components in percentage by mass: c:0.04 to 0.20 percent; si:0.30 to 0.90 percent; mn:1.00 to 1.50 percent; mo: 0.40-1.00%; ni:0.20 to 1.0 percent; w:0.1 to 1.0 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent, and can also comprise V:0 to 0.15 percent of Ti, 0 to 0.15 percent of B: 0.002-0.008%, nb 0-0.15%, and Fe and unavoidable impurity elements in balance; the weld joint structure is a martensitic structure.
Preferably, the welding seam strength of the welded steel plate is more than or equal to 800MPa, and the welding seam strength of the welded steel plate after the hot forming is more than or equal to 1500MPa. In the hot forming process, the wire is heated to an austenitizing temperature and then cooled at a cooling rate of not less than 30 ℃/s after sufficient austenitizing.
Preferably, the diameter of the welding wire is 0.8 mm-1.2 mm.
Preferably, the surface of the welding wire is plated with copper, and the thickness of the copper plating layer is 0.1-0.4 μm.
The method according to the invention allows welding between different materials, different grades, different thicknesses of the combined materials.
The effect and purpose of each component design in the welding wire are as follows:
c is an important element for improving the strength of the welding seam and increasing the hardenability of the welding seam metal, the higher the C content is, the higher the strength of the steel is, the welding wire production is completed through a plurality of annealing procedures, the production cost is high, and the strength of the welding seam metal is insufficient and the hardenability of the welding seam is poor when the C content is low. Comprehensively considering that the mass percentage of the C element is designed to be 0.04-0.10 percent.
Si and Mn can improve the strength of the welding seam and play a role in deoxidization. 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 0.30 and 0.90 percent and the Mn content is controlled between 1.00 and 1.50 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.
Mo is an element that increases the hardenability of steel and improves the weld strength. Mo has higher strength and creep resistance at high temperature, has the effect of reducing tempering brittleness, has large quenching capacity of weld metal caused by excessive addition, and is easy to form a twin crystal substructure in the weld, and the microstructure is easy to form microcracks, so that the quality defect of the weld is caused. Comprehensively considering the content of Mo to be 0.40-1.00 percent.
Ni is an element that forms and stabilizes austenite, and enlarges the austenite phase region. The alloy is matched with elements such as chromium, molybdenum and the like to improve the plasticity and toughness of the welding seam, and can increase the corrosion resistance of the welding seam. Comprehensively consider the welding wire Ni:0.2 to 1.0 percent.
Nb, V and Ti all have the functions of refining grains in the welding wire and improving 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, it needs to be added appropriately.
B is an element for strongly improving the hardenability of steel, and trace B can obviously improve the hardenability of the steel plate. B has strong affinity with O, N, is easy to generate nonmetallic inclusions, and when the content of B is too high, a large number of inclusions and martensite twin defects are easy to occur in a welding line, so that the strength and plasticity of the welding line are reduced, and the content adopted by the invention is as follows: 0.002-0.008%.
The W ensures that the heat conductivity coefficient of the welding seam is large and the thermal expansion coefficient is small in the welding seam, thereby effectively reducing the stress concentration caused by the structural transformation of the welding seam and improving the strength of the welding seam. Meanwhile, tungsten effectively inhibits weld joint grain growth in the heating process, and reduces weld joint performance reduction caused by coarse grains. The steel plate is matched with C, ni and Mo elements to form a martensitic structure in the hot forming process of the welding line, and meanwhile, the high strength and low brittleness of the welding line are maintained, so that the welding line is subjected to tensile test after hot forming, and the fracture position is in the steel plate. W belongs to noble metal element, and the cost of the welding wire with too high content is increased. The W content is comprehensively considered to be 0.1-1.0%.
The invention also discloses a preparation method of the hardenable welding wire, which comprises the following steps: smelting the molten steel containing the components, casting, rolling wire rods, drawing the welding wire and plating copper on the surface to obtain the welding wire. Surface copper plating can increase the corrosion resistance of the wire in air.
Compared with the prior art, the invention has the following advantages:
the invention can realize that full welding seams are obtained when the hot forming steel is subjected to laser welding, and reduces stress concentration at the welding seams. According to the invention, the welding wire is added with the element with higher hardenability, so that the quenching capacity of the welding seam is improved, a complete martensitic structure is obtained, the strength of the welding seam is improved, the breaking position is detected in the base material after the hot forming treatment in the stretching of the welding joint, and the strength is not lower than 1500MPa. The welding wire has the advantages of low alloy element content and low production cost. The invention can be realized on the existing laser welding equipment without equipment transformation.
Based on the reasons, the invention can be widely popularized in the fields of 1500 MPa-level non-plating 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 following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. 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 filler wire welding method suitable for 1500MPa grade non-coating hot forming steel comprises the following steps:
the welding sides of the two test plates are butted and fixed by a fixture, the gap between the two test plates is 0-0.2 mm, and at least one surface of the two test plates is positioned on a plane; laser welding, wherein welding wires are added into a welding pool for laser welding to form welding seams, and the welding pool is protected by inert gas; the welding wire is melted by the laser beam and then enters a welding pool in a liquid state, the molten metal of the welding wire and the molten metal of the test plate are fused together to form the welding seam, and a metal structure in the welding seam is a martensitic structure; the laser welding of the patent ensures that the weld joint is in full contact with the die in the thermoforming process, and weld joint metal is not lower than the surface of the test plate.
The welding wire is a hardenable welding wire, and comprises the following components in percentage by mass: c:0.04 to 0.10 percent; si:0.30 to 0.90 percent; mn:1.00 to 1.50 percent; mo: 0.40-1.00%; ni:0.20 to 1.0 percent; w:0.1 to 1.0 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent and V:0 to 0.15 percent of Ti, 0 to 0.15 percent of B: 0.002-0.008%, nb 0-0.15%, and Fe and unavoidable impurity elements in balance; the welding wire is melted by laser to form a martensitic structure.
The welding seam strength of the welded steel plate is more than or equal to 800MPa, and the welding seam strength of the welded steel plate after the welding is subjected to hot forming is more than or equal to 1500MPa.
In the hot forming process, the welding wire is heated (930-960 ℃) to an austenitizing temperature, and then cooled at a cooling rate of not less than 30 ℃/s.
The diameter of the welding wire is 0.8 mm-1.2 mm.
The surface of the welding wire is plated with copper, and the thickness of the copper plating layer is 0.1-0.4 mu m.
The method according to the invention allows welding between different materials, different grades, different thicknesses of the combined materials.
The invention also discloses a preparation method of the hardenable welding wire, which comprises the following steps: smelting the molten steel containing the components, casting, rolling wire rods, drawing the welding wire and plating copper on the surface to obtain the welding wire. Surface copper plating can increase the corrosion resistance of the wire in air.
The following describes in detail the performance of a laser filler wire welding method for 1500MPa grade electroless hot forming steel and the materials obtained by this method, as set forth in this embodiment, with four examples and three comparative examples.
Example 1:
a non-plating 22MnB5 hot forming steel with the thickness of 1.5mm is selected as an object material of a splice welding plate, a high-precision plate shearing machine is adopted to process and weld a test plate, two steel plates are butted at welding edges and fixed by a fixture, a gap between plate joints is 0mm, and the lower surface of the steel plates is kept on a plane. Welding was performed using the welding wire disclosed in example 1 of table 1, with a wire diameter of 1.0mm. The laser adopts a fiber laser, the defocusing amount is 0mm, the laser power is adjusted to 3.5kW, the welding speed is adjusted to 0.06m/s, the wire filling speed is adjusted to 0.06m/s, ar gas is used as shielding gas for laser wire filling welding, the upper surface of the welding seam is Gao Yao 0.3.3 mm, and the lower surface is 0.2mm. And (3) placing the welding plate into a heating furnace at 950 ℃ for heat preservation for 5min, taking out the welding plate after the time is up, placing the welding plate into a thermoforming mold for quenching, and taking out the welding plate after cooling, wherein the weld strength is shown in Table 2.
Example 2:
a non-plating 22MnB5 hot forming steel with the thickness of 1.5mm and the thickness of 1.2mm is selected as an object material of a splice welding plate, a high-precision plate shearing machine is adopted to process a welding test plate, welding edges of two steel plates are butted and fixed by a fixture, a gap between plate joints is 0.1mm, and the lower surface of the steel plates is kept on a plane. Welding was performed using the welding wire disclosed in example 2 of table 1, with a wire diameter of 1.2mm. The laser adopts a fiber laser, the defocusing amount is-1 mm, the laser power is adjusted to 3.5kW, the welding speed is adjusted to 0.06m/s, the wire filling speed is adjusted to 0.07m/s, ar gas is used as shielding gas for laser wire filling welding, the welding plate is placed in a heating furnace at 950 ℃ for heat preservation for 5min, the welding plate is taken out after the time, placed in a hot forming die for quenching, the welding plate is taken out after cooling, and the welding seam strength is shown in table 2.
Example 3:
a non-plating 22MnB5 hot forming steel with the thickness of 1.0mm and the thickness of 1.0mm is selected as an object material of the splice welding plate, and the welding test plate is processed by adopting a high-precision plate shearing machine. The welding edges of the two steel plates are butted and fixed by a fixture, the gap between the plate joints is 0.15mm, and the lower surfaces of the steel plates are kept on the same plane. Welding was performed using the welding wire disclosed in example 3 of table 1, with a wire diameter of 1mm. The laser adopts a fiber laser, the defocusing amount is 0mm, the laser power is adjusted to 3kW, the welding speed is adjusted to 0.05m/s, the wire filling speed is adjusted to 0.05m/s, ar gas is used as shielding gas for laser wire filling welding, the welding plate is placed in a heating furnace with the temperature of 960 ℃ for heat preservation for 5min, the welding plate is taken out after the time, placed in a thermoforming mold for quenching, the welding plate is taken out after cooling, and the welding seam strength is shown in a table 2.
Example 4:
a non-plating 22MnB5 hot forming steel with the thickness of 1.0mm and the thickness of 1.2mm is selected as an object material of the splice welding plate, and the welding test plate is processed by adopting a high-precision plate shearing machine. And (3) butt-jointing welding edges of the two steel plates and fixing the two steel plates by using a fixture, wherein a gap between plate joints is 0mm, and the lower surfaces of the steel plates are kept on a plane. Welding was performed using the welding wire disclosed in example 4 of table 1, with a wire diameter of 1mm. The laser adopts a fiber laser, the defocusing amount is 0mm, the laser power is adjusted to 3kW, the welding speed is adjusted to 0.05m/s, the wire filling speed is adjusted to 0.04m/s, ar gas is used as shielding gas for laser wire filling welding, the welding plate is placed in a heating furnace at 950 ℃ for heat preservation for 5min, the welding plate is taken out after the time, placed in a thermoforming mold for quenching, the welding plate is taken out after cooling, and the welding joint strength is shown in table 2.
As is clear from table 2, the structural components of the weld formed by the welding wire and the present method were martensite, whereas the structural components of the weld formed by the welding wire provided in comparative examples 1 to 3 were martensite+bainite. In the tensile strength test process, the steel welded by the method breaks at more than 1500MPa, and the breaking position is the base material. The steels welded by the welding wires provided in comparative examples 1 to 3 were broken at 975 to 1020MPa, and the breaking position was a weld position. Through the experiment and component observation, the welding seam structure is a complete martensitic structure, and the tensile strength is not lower than 1500MPa by adopting the method and the welding wire provided by the invention for welding.
Table 1 chemical composition of steel ingot and chemical composition (wt%) of comparative example
| C | Si | Mn | P | S | Ni | Mo | W | V | Nb | B | Ti | |
| Example 1 | 0.20 | 0.35 | 1.14 | 0.014 | 0.005 | 0.45 | 0.95 | 0.11 | 0.14 | 0.003 | ||
| Example 2 | 0.06 | 0.67 | 1.47 | 0.015 | 0.006 | 1.0 | 0.70 | 0.61 | 0.12 | 0.12 | ||
| Example 3 | 0.08 | 0.90 | 1.02 | 0.009 | 0.007 | 0.86 | 0.63 | 0.36 | 0.05 | 0.008 | ||
| Example 4 | 0.09 | 0.46 | 1.36 | 0.015 | 0.010 | 0.25 | 0.40 | 0.87 | 0.10 | 0.002 | 0.04 | |
| Comparative example 1 | 0.05 | 0.52 | 1.20 | 0.010 | 0.005 | 0.30 | ||||||
| Comparative example 2 | 0.06 | 0.47 | 1.67 | 0.011 | 0.006 | 0.27 | ||||||
| Comparative example 3 | 0.06 | 0.65 | 1.58 | 0.012 | 0.009 | 0.21 |
TABLE 2 mechanical Properties of laser tailor welded blanks
| Tensile strength MPa | Tissue of | Fracture site | |
| Example 1 | 1514 | Martensitic phase | Base material |
| Example 2 | 1520 | Martensitic phase | Base material |
| Example 3 | 1545 | Martensitic phase | Base material |
| Example 4 | 1535 | Martensitic phase | Base material |
| Comparative example 1 | 1020 | Martensitic phase+bainite | Weld joint |
| Comparative example 2 | 980 | Martensite+bainite | Weld joint |
| Comparative example 3 | 975 | Martensite+bainite | Weld joint |
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 (4)
1. The laser filler wire welding method suitable for 1500 MPa-level non-coating hot forming steel is characterized by comprising the following steps of:
during laser welding, welding wires are added into a welding pool, and inert gas is adopted for protection; the welding wire is a hardenable welding wire, and comprises the following components in percentage by mass: c:0.04 to 0.20 percent; si:0.30 to 0.90 percent; mn:1.00 to 1.50 percent; mo: 0.40-1.00%; ni:0.20 to 1.0 percent; w:0.1 to 1.0 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent, and the balance being Fe and unavoidable impurity elements; the weld joint structure is a martensitic structure.
2. The laser filler wire welding method for 1500MPa grade uncoated thermoformed steel of claim 1 wherein the welding wire further comprises V:0 to 0.15 percent of Ti, 0 to 0.15 percent of B: 0.002-0.008% and 0-0.15% of Nb.
3. The laser filler wire welding method for 1500 MPa-level non-coated hot-formed steel, according to claim 1, wherein the weld strength of the welded steel plate is more than or equal to 800MPa, and the weld strength of the welded steel plate after hot forming is more than or equal to 1500MPa.
4. A laser filler wire welding method for 1500MPa grade uncoated thermoformed steel in accordance with claim 3 wherein the thermoforming process is such that the welded sheet is heated to an austenitizing temperature sufficient to austenitize and cooled at a cooling rate of not less than 30 ℃/s.
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| CN202310512591.XA CN116551178A (en) | 2023-05-09 | 2023-05-09 | Laser filler wire welding method suitable for 1500 MPa-level non-coating hot forming steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310512591.XA CN116551178A (en) | 2023-05-09 | 2023-05-09 | Laser filler wire welding method suitable for 1500 MPa-level non-coating hot forming steel |
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