CN110900038A - Welding flux and process for laser welding of hot formed steel - Google Patents
Welding flux and process for laser welding of hot formed steel Download PDFInfo
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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
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
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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
- 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
- B23K35/3026—Mn as the principal constituent
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
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Abstract
The invention discloses a welding flux and a process for laser welding of hot-formed steel with an Al-Si coating coated on the surface, and belongs to the technical field of welding and connection. Molten salt and metal oxide are used as flux, and the flux comprises the following components in percentage by mass (Wt/%): silicon dioxide (SiO)2) 15-20%, manganese oxide (MnO) 20-30%, iron oxide (FeO) 10-15%, calcium fluoride (CaF)2) 5-10%, cryolite (Na)3AlF6) And (4) the balance. Coating an adhesive on a welding position of the hot-formed steel with the Al-Si coating coated on the surface in advance, and then adhering a welding flux on the surface of the welding position of the welding joint coated with the adhesive for welding. Under the condition of the same technical parameters, the hot forming steel coated with the Al-Si coating adopts welding flux and then is welded, the mechanical property of the joint is improved, the microhardness of a welding seam area is reduced, the microhardness value (HV)472-,the elongation of the joint is 1.6-2.2%.
Description
Technical Field
The invention relates to a welding flux and a process for laser welding of hot forming steel with an Al-Si coating coated on the surface, wherein molten salt and metal oxide are used as the welding flux to perform a physical and chemical reaction with the Al-Si coating on the surface of a hot forming steel plate in a metallurgical process, so that the problem that Al element is dissolved or permeates into a welding line and Fe element to form Fe-Al intermetallic compounds after the Al-Si coating is melted in the laser welding process is reduced, and the mechanical property of a laser welding joint is improved, and the invention belongs to the technical field of welding and connection.
Background
The hot forming steel is ultrahigh strength steel which has light weight, safety requirement and production cost. The hot forming steel adopts a hot forming technology, the plate has the characteristics of good plasticity, strong forming capability, small rebound quantity and the like at high temperature, the strength can reach 1500MPa after quenching, and the double requirements of stamping and quenching strengthening of the automobile safety structural part are met. The hot forming technology promotes the development of hot forming steel laser tailor-welded blanks, the multi-material combined structure design and the strength-variable forming design are combined, the hot forming steel and the laser tailor-welding technology are combined, the plates are subjected to laser tailor-welding before hot forming, the structural design of materials and parts is combined with the forming technology more tightly through the laser tailor-welding and hot forming technologies, the laser tailor-welding and hot forming technology is widely used for manufacturing a series of safety structural members such as an A column, a B column, a front longitudinal beam and a rear longitudinal beam of an automobile, the collision safety indexes such as the strength, the bending resistance, the torsional rigidity and the like of the safety structural members of the automobile are improved, the light weight of the automobile body is realized, the weight of the automobile body is reduced by 20 percent, and the laser. The hot forming steel needs to heat the plate to a temperature above 910 ℃ in the hot forming process, so that the surface of the plate is oxidized to generate oxides, and the generated oxides can influence the subsequent re-welding performance and coating performance. In order to avoid oxidation of the plate during the hot forming process of the hot forming steel, improve the surface quality of the plate, the re-welding performance, the subsequent precision forming precision and the like, different series of surface coating materials and process technologies are developed by some steel companies aiming at the forming process and characteristics of the hot forming steel. Wherein the Al-Si (aluminum silicon) coatingThe coating is a hot forming steel coating which is most widely applied at present, and has the advantages of high temperature resistance, low density, high thermal conductivity, wear resistance, small thermal expansion coefficient and the like. The Al-Si coating generates a continuous, uniform and compact Al-Si oxide protective film on the surface in a high-temperature oxidation environment, protective gas is not required to be added in the thermoforming process of the thermoformed steel coated with the Al-Si coating, no oxide is generated on the surface, subsequent surface shot blasting treatment is omitted, the processing environment is improved, the manufacturing size precision of parts and assembly parts is improved, and the method is popular with various automobile host factories and part factories. However, when the hot-formed steel plate is subjected to laser welding, the Al-Si coating on the surface seriously influences the weldability of the plate, and after the Al-Si coating is melted, Al elements can be dissolved or permeate into a welding line to form various brittle Fe-Al intermetallic compounds with Fe elements, so that the mechanical properties of a joint are reduced. The technical proposal for solving the problem is that the Al-Si coating on the surface around the welding position is mostly removed by pretreatment and then welding is carried out. And the pretreatment is to remove the Al-Si coating on the surface of the plate by adopting a mechanical or physical method, such as a grinding wheel, a scraper, shot blasting, laser ablation and the like, and then to weld, so that the influence of the Al-Si coating on the welding seam tissue and components in the welding process is avoided, and the mechanical property of the laser welding joint is reduced. The mechanical method is adopted to remove the coating, the working procedures are various, the production efficiency is low, and the serious pollution is caused to the surrounding environment. Therefore, a plurality of invention patents for direct laser welding process and materials of the hot forming steel coated with the Al-Si coating are applied in China. Patent 201380001259.1 discloses a method for laser tailor-welding directly without removing Al-Si coating by using filler wire (C content is 0.1-0.8 wt% higher than base material, and Mn content is 1.5-7.0 wt% higher than base material). Patent 201510165732.0 discloses a method of achieving laser tailor-welding directly without removing the Al-Si coating using a filler wire (containing 0.6-0.9 wt% C, 0.3-0.9 wt% Mn, 1.6-3.0 wt% Ni, and the balance Fe and other unavoidable impurities). The welding seam surplus height is formed by adopting the filler wire for laser welding, influences the flatness of the surface of the laser tailor-welded blank, easily causes stress concentration, and is unfavorable for bearing and dynamic load of the automobile safety structural part. Patent 201611036496.3 discloses a method of using one or both of oxygen and carbon dioxide with an inert gas (nitrogen, argon, etc.)The mixed gas is used as protective gas to improve the oxygen partial pressure in the welding pool, and the oxygen and the aluminum element are combined to form Al which does not influence the toughness of the welding seam2O3And the formation of intermetallic compounds and the influence on austenite phase transformation between Al and Fe elements are inhibited, and the full-lath martensite structure is finally obtained in a welding seam area. Nitrogen is used as protective gas, and the nitrogen reacts with steel materials at high temperature to generate nitride Fe4N，Fe4N is a brittle and hard intermetallic compound, which can improve the hardness of a welding seam and sharply reduce the shaping and toughness, and when steel is welded, the prevention of the nitriding of the welding seam metal is an important problem. Thus, the use of one technique does not compromise other properties of the product while addressing a problem. In recent years, the use of fluxes for laser welding has been of interest to researchers in the field, applying for a number of invention patents, such as patent 201610412023.2 and 201610117506. X. The mechanical properties of the weld joint depend on the chemical composition of the weld metal and the state of the structure of the weld metal, and the structure of the weld joint is the result of the joint action of the chemical composition of the weld and the welding thermal process. The cracking of the welded joint in the subsequent precision forming process of the hot formed steel laser tailor-welded blank is often caused not by the low strength of the joint but by the reduced shaping of the joint. How to improve the influence of the Al-Si coating on the weldability of the hot forming steel during laser welding and improve the toughness of a welding joint is a technical problem to be solved urgently by scientific researchers.
Disclosure of Invention
The invention relates to a welding flux and a process for laser welding of hot forming steel with an Al-Si coating coated on the surface, wherein molten salt and metal oxide are used as the welding flux, and the molten salt and the metal oxide absorb laser heat to melt during the laser welding to form slag which generates a physical and chemical reaction with the Al-Si coating on the surface of the hot forming steel plate in a metallurgical process, so that the Al element is dissolved or infiltrated into a welding line to form Fe-Al intermetallic compounds with the Fe element after the Al-Si coating is melted in the laser welding process; meanwhile, in the laser welding process, molten salt and molten slag formed by melting metal oxides isolate air, protect metal in a welding area from being damaged by air, reduce oxidation and burning loss of alloy elements in the hot formed steel, and improve the forming quality of a welding seam, so that the mechanical property of a laser tailor-welded blank joint of the hot formed steel is improved, and the defects of joint cracking and the like caused in the subsequent plastic forming process are reduced.
The core technology of the invention is to remove or reduce the influence of the Al-Si coating and the oxide formed by the Al-Si coating on the mechanical property of the joint by adopting the welding flux, in particular to improve the shaping and the toughness of the joint of the hot forming laser tailor-welded blank.
The above object of the present invention is achieved by: a welding flux for laser welding of hot-formed steel with Al-Si coating on its surface is prepared through spraying a layer of molten salt and metallic oxide on the welded joint of hot-formed steel with Al-Si coating as welding flux, and solidifying the molten salt and metallic oxide after laser fusion and the Al-Si coating on the surface of hot-formed steel plate are physically and chemically reacted to form slag. The invention relates to a welding flux and a process for laser welding of hot forming steel with Al-Si coating on the surface, wherein the molten salt and metal oxide components are as follows by mass percent (Wt/%): silicon dioxide (SiO)2) 15-20%, manganese oxide (MnO) 20-30%, iron oxide (FeO) 10-15%, calcium fluoride (CaF)2) 5-10%, cryolite (Na)3AlF6) And (4) the balance.
The invention is realized by adopting the following technical scheme, which is described in the following with reference to the attached drawings (figures 1, 2 and 3):
FIG. 1 is a weld of a hot formed steel sheet without the use of a flux, the microstructure being analyzed by energy spectroscopy as an Al-Fe-Si intermetallic consisting of 5.82% Al, 1.25% Si and 92.93% Fe, with cracking along the weld line.
FIG. 2 is a weld of a hot formed steel plate using a flux, the average Al content of the weld zone being reduced from 3.76% to 1.42%.
FIG. 3 shows the results of the weld composition spectroscopy.
The invention relates to a welding flux and a process for laser welding of hot-formed steel with Al-Si coating on the surface, which comprises the following steps:
firstly, drying the powdery fused salt and the metal oxide at the drying temperature of 220 ℃ and 280 ℃ for 30-50min to prepare the flux according to the following design component ratio, and oxidizing the fused salt and the metalThe components in percentage by mass (Wt/%) are as follows: silicon dioxide (SiO)2) 15-20%, manganese oxide (MnO) 20-30%, iron oxide (FeO) 10-15%, calcium fluoride (CaF)2) 5-10%, cryolite (Na)3AlF6) And (4) the balance.
Secondly, uniformly mixing and stirring the molten salt and the metal oxide according to the designed component proportion, granulating, drying at low temperature (300-;
and thirdly, uniformly coating a layer of adhesive on the welding position of the hot-formed steel, namely the surface of the welding joint, of which the surface is coated with the Al-Si coating, wherein the thickness can firmly adhere the welding flux on the surface of the welding position of the welding joint. The adhesive is a commercially available adhesive which is also commonly used for various welding fluxes or soldering pastes, the adhesive component is a transparent plastic body with certain viscosity and prepared by using polystyrene as a solute and trichloroethylene as a solvent, and the adhesive is heated to 150-370 ℃ and completely volatilizes without leaving any residue to influence the subsequent laser welding.
In the prior art, the fused salt is prepared by adding a proper amount of binder into designed fused salt components, mixing and stirring, granulating and drying at low temperature. The invention uses the fused salt and the metal oxide separately from the binder, can avoid the influence of the binder on the performance of the solder in the welding process, and more importantly, ensures that the solder prepared by the fused salt and the metal oxide can be firmly adhered to the surface of the welding position of the welding joint.
Fourthly, spraying the molten salt and the metal oxide welding flux prepared according to the design components on the surface of the welding joint of the hot forming steel tailor-welded blank coated with the binder.
And fifthly, performing laser tailor-welding, namely welding the thermoformed steel tailor-welded blank coated with the Al-Si coating on the surface by laser welding. The most common 22MnB5 steel is selected as the hot forming steel plate, the thickness of the plate is 1.0mm, and the thickness of the coating Al-Si coating layer is actually measured to be 20-30 um. The plate is welded by laser welding, and the laser welding machine is CO2Laser, welding power P1.5 kw, welding speed V2000 mm/min, defocusing F0 mm, side blowing pureAr, the flow rate is 20L/min, the joint is in a butt joint mode, the joint is performed in a center focusing mode, and the length of a welding line is 1000 mm. The method comprises the steps of carrying out laser tailor-welding on a plate before hot forming, simulating a hot forming process, heating a tailor-welded test piece to 910 ℃, preserving heat for 5min, and putting the tailor-welded test piece into water for cooling and quenching to obtain a hot-forming laser tailor-welded plate test piece.
The Al-Si coating coated on the surface of the hot-formed steel is easy to generate a continuous, uniform and compact Al-Si oxide protective film in an oxidizing environment, and the oxide protective film can prevent the oxidation and corrosion of the plate and also can influence the weldability of the subsequent plate; meanwhile, during laser welding, the Al-Si coating coated on the surface also seriously influences the weldability of the plate, and after the Al-Si coating is melted, Al elements can be dissolved or infiltrated into a welding line to form various brittle Fe-Al intermetallic compounds with Fe elements, so that the mechanical properties of the joint are reduced. The fused salt is a fused mass composed of metal cations and non-metal anions, and refers to a fused mass formed by melting salts, and the fused salt can reach 2400 or more varieties. Cryolite is also known as sodium hexafluoroaluminate or sodium aluminum fluoride (Na)3AlF6) The aluminum-silicon alloy and the aluminum oxide can be dissolved to form compounds such as a composite salt melt, the Al-Si coating on the surface and the formed metal oxide can be removed in the laser welding process, and the influence of the Al-Si coating on the surface on the weldability of the hot forming steel can be reduced.
Laser welding adopts high-energy-density laser as a heat source to irradiate the joint of the metal materials, so that the metal materials to be connected are melted to form a molten pool after absorbing laser energy, and a welding joint is formed after the molten pool is solidified. The absorption of laser light by metallic materials depends on their own physicochemical properties, such as absorption, reflectivity, thermal conductivity, melting temperature, evaporation temperature, etc., of which the most important is absorption. The hot forming steel coated with the Al-Si coating has high reflectivity and low absorptivity to laser because free electrons with high density exist in the aluminum alloy, and the free electrons are forced to vibrate by strong electromagnetic waves to generate secondary electromagnetic waves, so that violent reflected waves and weaker transmitted waves are caused. In order to achieve greater weld penetration at lower laser power, a stable welding process and excellent weld formation quality, it is necessaryThe absorption rate of the metal material to the energy of the light beam can be effectively increased. At the same time, CO is used2When the laser is used for welding, the metal material has low absorptivity at room temperature, and the absorptivity can be increased only after the metal material is melted. Increase of CO in metallic material2The most effective technique for absorbing the light beam is to use a surface coating or a surface oxide film. Based on the above principle, the present invention employs molten salt and metal oxide as part of the components of the flux for laser welding of Al-Si coating-surface-coated hot-formed steel. The core technology of the invention is that cryolite in the welding flux is adopted to remove or reduce the influence of the Al-Si coating on the mechanical property of the joint, the metal oxide fused salt is adopted to avoid influencing the action of the cryolite, and the melting temperature range of the compound such as the formed compound salt fused mass can be matched with the melting temperature range of a molten pool formed after the laser welding hot forming steel is melted.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a welding flux and a process for laser welding of hot-formed steel with Al-Si coating on the surface, by adopting the fused salt and the metal oxide as the flux, the coating removal and the laser welding are simultaneously implemented, the process is simple, the method has the advantages of less environmental pollution, physical and chemical reaction of molten salt and metal oxide with the Al-Si coating on the surface of the hot-formed steel plate in the metallurgical process, improvement of the weldability of the hot-formed steel with the Al-Si coating coated on the surface, reduction of Fe-Al intermetallic compounds formed by Al element dissolved or permeated into welding seams and Fe element after the Al-Si coating is melted in the laser welding process, reduction of the average content of Al element in the welding seam area from 3.76% to 1.42%, remarkable reduction of microhardness, improvement of ductility and toughness, improvement of the mechanical properties of laser tailor-welded steel plate joints, reduction of defects of joint cracking and the like caused in the subsequent plastic forming process.
Drawings
FIG. 1 is a weld of a hot formed steel sheet without the use of a flux, the microstructure being analyzed by energy spectroscopy as an Al-Fe-Si intermetallic consisting of 5.82% Al, 1.25% Si and 92.93% Fe, with cracking along the weld line.
FIG. 2 is a weld of a hot formed steel plate using a flux, the average Al content of the weld zone being reduced from 3.76% to 1.42%.
FIG. 3 shows the results of the weld energy spectrum analysis of a hot formed steel plate using a flux.
Detailed Description
The process of the present invention is further illustrated in detail by the examples given below.
The invention relates to a welding flux and a process for laser welding of hot forming steel with an Al-Si coating coated on the surface, which are used for laser welding of the hot forming steel, wherein molten salt and metal oxide are used as the welding flux, the coating removal and the laser welding are simultaneously carried out, the molten salt and the metal oxide and the Al-Si coating on the surface of the hot forming steel plate are subjected to physical and chemical reactions in a metallurgical process, the weldability of the hot forming steel with the Al-Si coating coated on the surface is improved, the Fe-Al intermetallic compound formed by the Al element dissolved or permeated into a welding line and the Fe element after the Al-Si coating is molten in the laser welding process is reduced, the microhardness of the welding line area is obviously reduced, the plastic toughness is improved, the mechanical property of the joint of the hot forming steel laser tailor-welded blank is improved.
The invention relates to a welding flux and a process for laser welding of hot-formed steel with Al-Si coating on the surface, which comprises the following process steps:
firstly, drying the powdery molten salt and the metal oxide at the drying temperature of 220-: silicon dioxide (SiO)2) 15-20%, manganese oxide (MnO) 20-30%, iron oxide (FeO) 10-15%, calcium fluoride (CaF)2) 5-10%, cryolite (Na)3AlF6) And (4) the balance.
Secondly, uniformly mixing and stirring the molten salt and the metal oxide according to the designed component proportion, granulating, drying at low temperature (300-;
and thirdly, uniformly coating a layer of adhesive on the welding position of the hot-formed steel, namely the surface of the welding joint, of which the surface is coated with the Al-Si coating, wherein the thickness can firmly adhere the welding flux on the surface of the welding position of the welding joint. The adhesive is a commercially available adhesive which is also commonly used for various welding fluxes or soldering pastes, the adhesive component is a transparent plastic body with certain viscosity and prepared by using polystyrene as a solute and trichloroethylene as a solvent, and the adhesive is heated to 150-370 ℃ and completely volatilizes without leaving any residue to influence the subsequent laser welding.
In the prior art, the fused salt is prepared by adding a proper amount of binder into designed fused salt components, mixing and stirring, granulating and drying at low temperature. The invention uses the fused salt and the metal oxide separately from the binder, can avoid the influence of the binder on the performance of the solder in the welding process, and more importantly, ensures that the solder prepared by the fused salt and the metal oxide can be firmly adhered to the surface of the welding position of the welding joint.
Fourthly, spraying the molten salt and the metal oxide welding flux prepared according to the design components on the surface of the welding joint of the hot forming steel tailor-welded blank coated with the binder.
And fifthly, performing laser tailor-welding, namely welding the thermoformed steel tailor-welded blank coated with the Al-Si coating on the surface by laser welding. The most common 22MnB5 steel is selected as the hot forming steel plate, the thickness of the plate is 1.0mm, and the thickness of the coating Al-Si coating layer is actually measured to be 20-30 um. The plate is welded by laser welding, and the laser welding machine is CO2The laser device, welding power P equals 1.5kw, welding speed V equals 2000mm/min, defocusing F equals 0mm, the side blowing is pure Ar, the flow is 20L/min, the joint form is the butt joint, adopt the mode of central focusing to go on, the welding seam length is 1000 mm. The method comprises the steps of carrying out laser tailor-welding on a plate before hot forming, simulating a hot forming process, heating a tailor-welded blank test piece to 910 ℃, preserving heat for 5min, and putting the tailor-welded blank test piece into water for cooling and quenching to obtain a hot-formed steel laser tailor-welded blank test piece.
All the following examples were laser tailor welded according to the above process steps and process parameters, and the examples are shown in table 1 below.
TABLE 1 solder compositions and laser weld joint Performance of Hot formed steels
The invention relates to a welding flux and a process for laser welding of hot forming steel with Al-Si coating on the surface, which are used for laser welding of a joint of the hot forming steel with Al-Si coating on the surface according to the process steps and components, and achieve the following technical indexes:
(1) the average content of Al element in the welding seam area is reduced to 1.42 percent from 3.76 percent, the microhardness is obviously reduced, and the microhardness value (HV) 472-;
(2) the toughness of the joint is improved, the room-temperature transverse tensile test reference standard GB/T2651-2008 welding joint tensile test method of the joint is completed on a CSS electronic universal tester, and the elongation of the joint is 1.6-2.2%.
Claims (3)
1. A flux for laser welding of hot formed steel, characterized in that the surface of the laser welded joint of hot formed steel coated with Al-Si coating is coated with a layer of flux, the flux is molten salt and metal oxide are used as flux, and the flux comprises the following components by mass percent Wt/%: silicon dioxide SiO215-20%, manganese oxide MnO 20-30%, iron oxide FeO 10-15%, calcium fluoride CaF25-10% of cryolite Na3AlF6And (4) the balance.
2. The flux for laser welding of hot formed steel as claimed in claim 1, wherein the flux itself does not contain a binder, but the binder is applied to the tailor welded joint of hot formed steel coated with Al-Si coating in advance, and then the flux is adhered to the surface coated with the binder at the welded joint.
3. Process for laser welding of surface thermoformed steel according to claim 1, characterized in that it comprises the following process steps:
firstly, drying the powdery molten salt and the metal oxide at the drying temperature of 220 ℃ and 280 ℃ for 30-50min to prepare the welding flux according to the designed component ratio;
secondly, uniformly mixing and stirring the molten salt and the metal oxide according to the designed component proportion, granulating, drying at the low temperature of 300 ℃ and 400 ℃, crushing again, screening to prepare the welding flux, wherein the size of the particles of the molten salt and the metal oxide welding flux after crushing and screening is 20-50 mu m;
thirdly, uniformly coating a layer of adhesive on the welding position of the hot-formed steel, namely the surface of a welding joint, of which the surface is coated with the Al-Si coating, wherein the thickness can firmly adhere the welding flux on the surface of the welding position of the welding joint;
fourthly, spraying the molten salt and the metal oxide welding flux prepared according to the design components on the surface of the welding joint of the hot forming steel tailor-welded blank coated with the binder;
fifthly, performing laser tailor-welding, namely welding a hot-forming steel tailor-welded plate coated with an Al-Si coating on the surface by laser welding, wherein the hot-forming steel plate is the most common 22MnB5 steel, the thickness of the plate is 1.0mm, and the actual measurement of the thickness of the coating Al-Si coating is 20-30 um; the plate is welded by laser welding, and the laser welding machine is CO2The welding power P of the laser is 1.5kw, the welding speed V is 2000mm/min, the defocusing amount F is 0mm, side blowing is pure Ar, the flow is 20L/min, the joint is in butt joint, the welding is carried out in a center focusing mode, and the length of a welding seam is 1000 mm;
the method comprises the steps of carrying out laser tailor-welding on a plate before hot forming, simulating a hot forming process, heating a tailor-welded blank test piece to 910 ℃, preserving heat for 5min, and putting the tailor-welded blank test piece into water for cooling and quenching to obtain a hot-formed steel laser tailor-welded blank test piece.
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| CN111975242A (en) * | 2020-07-31 | 2020-11-24 | 鞍钢钢材加工配送（长春）有限公司 | Soldering paste and process for improving plasticity of welding joint of hot forming steel tailor-welded blank with aluminum-silicon coating |
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| US3969604A (en) * | 1973-10-04 | 1976-07-13 | Ford Motor Company | Method of welding galvanized steel |
| DE4124976A1 (en) * | 1991-07-27 | 1993-01-28 | Man Technologie Gmbh | Butt welding metal foil - by precoating seam area with flux to prevent oxide film formation |
| CN103551761A (en) * | 2013-11-12 | 2014-02-05 | 中联重科股份有限公司 | Soldering flux, application and soldering method thereof |
| CN106573340A (en) * | 2014-07-28 | 2017-04-19 | 西门子能源有限公司 | Laser metalworking of reflective metals using flux |
| CN105834587A (en) * | 2016-05-28 | 2016-08-10 | 北京工业大学 | Soldering flux assisted laser welding method |
| CN106475683A (en) * | 2016-12-29 | 2017-03-08 | 苏州大学 | A kind of laser assembly solder method with Al Si coating hot forming steel plate |
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| CN111975242A (en) * | 2020-07-31 | 2020-11-24 | 鞍钢钢材加工配送（长春）有限公司 | Soldering paste and process for improving plasticity of welding joint of hot forming steel tailor-welded blank with aluminum-silicon coating |
| CN111975242B (en) * | 2020-07-31 | 2021-12-21 | 鞍钢钢材加工配送（长春）有限公司 | Soldering paste and process for improving plasticity of welding joint of hot forming steel tailor-welded blank with aluminum-silicon coating |
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