WO2022016594A1 - Procédé de fabrication de pièces en acier composite d'acier plaqué d'aluminium-silicium/acier à haute résistance formé à chaud - Google Patents

Procédé de fabrication de pièces en acier composite d'acier plaqué d'aluminium-silicium/acier à haute résistance formé à chaud Download PDF

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WO2022016594A1
WO2022016594A1 PCT/CN2020/105539 CN2020105539W WO2022016594A1 WO 2022016594 A1 WO2022016594 A1 WO 2022016594A1 CN 2020105539 W CN2020105539 W CN 2020105539W WO 2022016594 A1 WO2022016594 A1 WO 2022016594A1
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Prior art keywords
steel
silicon
aluminum
welding
strength hot
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PCT/CN2020/105539
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English (en)
Chinese (zh)
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孙茜
朱天才
王晓南
胡增荣
孙立宁
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苏州大学
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Publication of WO2022016594A1 publication Critical patent/WO2022016594A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • 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
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
    • B23K26/0821—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head using multifaceted mirrors, e.g. polygonal mirror
    • 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
    • B23K26/60—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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Definitions

  • the invention relates to the technical field of automobile parts manufacturing, in particular to a laser welding method for steel and high-strength hot forming steel without removing aluminum-silicon coating.
  • Hot-formed steel Pressure-harden steel, PHS
  • PHS Pressure-harden steel
  • the surface of the steel plate is usually pre-applied with an aluminum-silicon coating.
  • aluminum-silicon coating can provide good corrosion resistance and high-temperature oxidation resistance for steel plates, but it will bring new problems to the welding of steel plates.
  • laser ablation is the most effective technology, and it is also the only technology for industrialized production of aluminum-silicon-coated laser-tailored welded blanks.
  • laser ablation and electron beam ablation can be used to achieve laser welding of tailor-welded blanks containing aluminum-silicon-coated steel, the laser ablation process undoubtedly increases equipment investment, reduces production efficiency, and increases production costs.
  • the Chinese patent with publication number CN106392328B discloses a method for tailor welding a thermoformed steel sheet with Al-Si coating under the condition of protective gas using laser welding equipment, wherein the protection
  • the gas includes a mixture of one or both of oxygen and carbon dioxide and an inert gas.
  • the oxidizing gas used in this patent increases the oxygen partial pressure in the welding pool, so that the Al element entering the welding pool combines with the O element to form Al 2 O 3 that does not affect the strength and toughness of the weld, inhibiting Al and Fe
  • the elements form intermetallic compounds and affect the austenite transformation, and finally a weld zone with a full lath martensitic structure is obtained, and the strength of the weld reaches the level of the base metal.
  • the method does not need to add welding wire and does not need to remove the coating layer before welding, the method is simple, the production efficiency is improved, and the production cost is reduced.
  • this solution still has the following shortcomings: First, the group of tailor-welded blanks has high requirements on the gap, and the gap is generally required to be no more than 0.1t, which is virtually equivalent to increasing the difficulty of welding; second, during the welding process , if the aluminum in the coating enters the welding pool, there will still be a risk of segregation, resulting in instability in the production process; third, the welding pool stays for a very short time, and the oxidation reaction of aluminum is limited, resulting in poor results.
  • the technical problem to be solved by the present invention is to provide a method for manufacturing aluminum-silicon-coated steel/high-strength hot-formed steel composite steel parts, which can realize Al-Si coated steel and Al-Si coated steel without removing the Al-Si coating.
  • the good connection of other high-strength hot-formed steels improves the mechanical properties of welded joints and reduces the formation of delta ferrite in the weld, providing favorable conditions for the next step of hot stamping.
  • the present invention provides the following technical solutions:
  • a method for manufacturing aluminum-silicon-coated steel/high-strength hot-formed steel composite steel parts comprising:
  • Step 1 Fix an aluminum-silicon-coated steel plate and a high-strength hot-formed steel plate on the workbench in the form of splicing, so that the two steel plates are in close contact;
  • Step 2 under a protective atmosphere, laser galvanometer welding is performed on the butt joints of the two steel plates, so that the joints are melted and solidified to form a high-quality weld;
  • Step 3 hot stamping the welded steel plate to obtain aluminum-silicon-coated steel/high-strength hot-formed steel composite steel parts;
  • the protective atmosphere contains 5-100 vol.% oxidizing gas, and the moving path of the light spot is controlled to be offset by 0-3 mm to the side of the high-strength hot-formed steel sheet during the galvanometer welding.
  • the thickness of the aluminum-silicon coating of the aluminum-silicon coated steel sheet is 5-50 ⁇ m, and the aluminum content in the aluminum-silicon coating is more than 70%.
  • the thickness of the two steel plates is 0.8-3.0 mm, and the gap between the two steel plates is controlled to be less than 0.3t during fixing.
  • the composition of the steel plate in the aluminum-silicon coated steel plate is: 0.10% ⁇ C ⁇ 0.5%; 0.5% ⁇ Mn ⁇ 3%; 0.1% ⁇ Si ⁇ 1%; 0.01% ⁇ Cr ⁇ 1% ; Ti ⁇ 0.2%; Al ⁇ 0.1%; S ⁇ 0.05%; P ⁇ 0.1%; 0.0002% ⁇ B ⁇ 0.010%, and the rest is iron.
  • the composition of the high-strength hot-formed steel sheet is: 0.10% ⁇ C ⁇ 0.5%; 0.5% ⁇ Mn ⁇ 3%; 0.1% ⁇ Si ⁇ 1%; 0.01% ⁇ Cr ⁇ 1%; Ti ⁇ 0.2%; Al ⁇ 0.1%; S ⁇ 0.05%; P ⁇ 0.1%; 0.0002% ⁇ B ⁇ 0.010%, V ⁇ 0.2%, and the rest is iron.
  • the protective atmosphere is an oxidizing gas or is composed of an oxidizing gas and an inert gas
  • the inert gas is selected from one or more of helium, argon, and nitrogen
  • the oxidizing gas is The gas is CO 2 .
  • the protective atmosphere is the protective atmosphere in which the content of oxygen is less than or equal to 15 vol.%, and the content of CO 2 is less than or equal to 100 vol.%.
  • step 2 the flow rate of the protective atmosphere is 5-35 L/min, the upper and lower surfaces of the steel plate need to be protected by shielding gas during the welding process, and the angle between the upper surface shielding gas nozzle and the surface of the steel plate is less than 90°.
  • the parameters of the laser galvanometer welding are: laser power 1000-10000W, welding speed 1-20m/min, scanning trajectory is " ⁇ ", “ ⁇ ", “ ⁇ ” or , the scanning radius is 0.3 ⁇ 3.0mm, and the scanning speed is 200 ⁇ 2000mm/s.
  • step 3 the heating temperature during hot stamping is between 900-1000°C, the heating time is controlled at 3-8 min, and the cooling rate after hot stamping is controlled at more than 30°C/s.
  • the laser welding method of the aluminum-silicon coated steel/high-strength hot-formed steel of the present invention can realize the good connection between the Al-Si coated steel and other high-strength hot-formed steel without removing the Al-Si coating, and improve the welding joint.
  • the laser welding method of reducing the formation of delta ferrite in the weld provides favorable conditions for the next step of hot stamping.
  • the present invention utilizes laser galvanometer welding to replace existing laser linear welding, and the whirling vibration of laser galvanometer welding helps to stir the laser molten pool, so that the Al elements on the surface of the aluminum-silicon coated steel are uniformly dispersed in the molten pool, It helps to homogenize the elements in the molten pool, thereby enhancing the strength and toughness of the weld and improving the performance of the welded joint.
  • the moving path of the laser beam spot during welding is shifted by a certain distance to the side of the high-strength thermoforming steel.
  • the chemical composition content in the welding pool is a mixture of 50% Al-Si coated steel and 50% high-strength hot-forming steel;
  • the content of molten high-strength hot-formed steel in the molten pool is higher than 50%, while the content of molten aluminum-silicon coated steel is less than 50%, thereby reducing the content of Al in the molten pool, so that no delta ferrite is formed in the weld, all of which are Lath martensite, which significantly increases the strength and toughness of the weld.
  • the present invention utilizes laser galvanometer to weld aluminum-silicon-coated steel and high-strength thermoforming steel to obtain a beautifully formed weld surface, no segregation of aluminum elements in the weld, no welding defects such as cracks, pores and inclusions, and no obvious weld surface. Oxidation phenomenon.
  • laser beam swing welding has a wider seam width, and laser beam swing welding has a greater tolerance to the weld gap, which can reach 0.3t and below, so it can reduce the difficulty of welding, thereby reducing Welding costs.
  • Fig. 1 is the schematic diagram of the laser welding method of the present invention
  • Fig. 2 is the macroscopic topography of the upper surface of the weld seam welded by laser galvanometer in Example 1 (the upper side plate is aluminum-silicon coated steel, and the lower side plate is 2GPa hot-formed steel);
  • Figure 3 is the microstructure of the weld after linear laser welding and hot forming in Comparative Example 1 (LM refers to lath martensite, ⁇ -F refers to ⁇ ferrite);
  • Fig. 4 is the microstructure of the welded seam after laser galvanometer welding and thermoforming in Comparative Example 2;
  • Example 5 is the microstructure of the welded seam after laser galvanometer welding and thermoforming in Example 1.
  • the welding of aluminum-silicon coated plates is mainly realized by three means: removing the aluminum-silicon coating, laser wire filling welding and optimizing the welding process.
  • these three methods increase equipment investment and change the Various problems such as alloy composition and increased production cost.
  • the present invention provides a manufacturing method of aluminum-silicon-coated steel/high-strength hot-formed steel composite steel parts, including:
  • the protective atmosphere contains 5-100 vol.% oxidizing gas, and the moving path of the light spot is controlled to be offset by 0-3 mm to the side of the high-strength hot-formed steel sheet during the galvanometer welding.
  • the steel plate is preferably pretreated before welding to remove oil stains on the surface of the steel plate.
  • the pretreatment is specifically cleaning the hot-formed steel sheet with a solvent, and then air-drying.
  • a solvent As the solvent, ethanol, acetone and other commonly used cleaning solvents in the art can be used.
  • the steel plate can be directly fixed for welding after cleaning, and there is no need to remove the aluminum-silicon coating on the surface of the hot-formed steel plate by means of laser ablation, mechanical peeling, etc., which not only simplifies the welding process, but also reduces equipment investment and production costs. .
  • fixing the steel plates on the workbench in the form of splicing is specifically: placing two steel plates on the workbench, and using welding fixtures to fix them, so that the two steel plates are butted together.
  • the workbench and the welding fixture are not limited, and may be workbenches and welding fixtures well known to those skilled in the art.
  • the thickness of the two steel plates may be equal or unequal, and the thickness of the two steel plates is preferably between 0.8 and 3.0 mm.
  • the gap between the steel plates can be controlled to be less than 0.3t, while the gap requirement of ordinary laser linear welding is not more than 0.1t. This shows that the welding method of the present invention has a higher tolerance of the gap of the welding seam, and can be used on components with lower requirements on the gap.
  • the source of the aluminum-silicon-coated steel sheet used is not particularly limited, and it can be the aluminum-silicon-coated steel sheet commonly used in the field.
  • the thickness of the aluminum-silicon coating is preferably between 5 and 50 ⁇ m, and the aluminum content in the aluminum-silicon coating is preferably more than 70%.
  • the composition of the steel sheet may be (in mass percentage): 0.10% ⁇ C ⁇ 0.5%; 0.5% ⁇ Mn ⁇ 3%; 0.1% ⁇ Si ⁇ 1%; 0.01% ⁇ Cr ⁇ 1 %; Ti ⁇ 0.2%; Al ⁇ 0.1%; S ⁇ 0.05%; P ⁇ 0.1%; 0.0002% ⁇ B ⁇ 0.010%, the rest are iron and inevitable impurities in the production process.
  • the composition may be (in mass percentage): 0.10% ⁇ C ⁇ 0.5%; 0.5% ⁇ Mn ⁇ 3%; 0.1% ⁇ Si ⁇ 1%; 0.01% ⁇ Cr ⁇ 1%; Ti ⁇ 0.2%; Al ⁇ 0.1%; S ⁇ 0.05%; P ⁇ 0.1%; 0.0002% ⁇ B ⁇ 0.010%, V ⁇ 0.2%, and the rest is iron.
  • the protective atmosphere is an oxidizing gas; or a mixed gas composed of an oxidizing gas and an inert gas.
  • the oxidizing gas can be CO 2 ;
  • the inert gas can be one or more of helium, argon, and nitrogen.
  • the content of oxygen is less than or equal to 15 vol.%, and the content of CO 2 is less than or equal to 100 vol.%.
  • the protective atmosphere is: 80% Ar+20% CO 2 or 100% CO 2 .
  • the flow rate of the protective atmosphere is preferably 5-35 L/min, preferably 10-20 L/min.
  • the upper and lower surfaces of the steel plate must be fed with protective gas at the same time, and the angle between the upper surface gas nozzle and the surface of the steel plate is less than 90°.
  • the used laser welding equipment can be a fiber laser, a semiconductor laser or a carbon dioxide laser.
  • the parameters of laser galvanometer welding are: the laser power is preferably 1000-10000W, the welding speed is preferably 1-20m/min, and the scanning trajectory can be " ⁇ " or “ ⁇ ” or Or “ ⁇ ” or the like can achieve similar trajectory changes, the scanning radius is preferably 0.3-3.0 mm, and the scanning speed is preferably 200-2000 mm/s.
  • the moving path of the light spot is shifted to the side of the high-strength thermoforming steel sheet by 0-3 mm, which means that the center of the laser scanning track is located on the side of the high-strength thermoforming steel sheet, and the distance between the butt joints with the two steel sheets is 0 to 3 mm, for example, may be 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.5 mm, 2.5 mm, or the like. Its function is to not only realize the fusion welding of two steel plates, but also realize that the mass fraction of Al element in the molten pool is lower than the minimum mass fraction for forming delta ferrite.
  • the heating temperature during hot stamping of the tailor welded blank is preferably between 900 and 1000°C, the heating time is preferably controlled at 3 to 8 minutes, and the cooling rate after hot stamping is preferably controlled at more than 30°C/s.
  • the welding seam strength of the laser welded joint formed after welding is 1000-1500 MPa
  • the strength of the aluminum-silicon coating side of the steel parts after hot stamping can reach 1500 MPa
  • the strength of the high-strength hot-formed steel side can reach 2000 MPa.
  • the steel parts prepared by the invention can be used for possible future application positions such as A-pillars, B-pillars, intermediate passages, door knockers, etc. of the body-in-white of automobiles.
  • the welding method of oscillating galvanometer of aluminum-silicon-coated steel/high-strength hot-formed steel includes the following steps:
  • Step (1) select 1.5mm thick aluminum-silicon-coated 22MnB5 steel and 1.5mm-thick 2GPa hot-formed steel, remove oil stains with alcohol; the coating thickness of aluminum-silicon coated 22MnB5 steel is 20 ⁇ m to 40 ⁇ m.
  • Step (2) Place the two steel plates on the workbench in the form of splicing, and use a special welding fixture to make the two steel plates in close contact.
  • Step (3) use the IPG-6kW fiber laser to weld the test board, the laser power used is 3.0kW, the welding speed is 5.0m/min, the swing diameter is 0.5mm, the swing frequency is 50Hz, and the defocus amount is +5.0mm, the shielding gas used is 80% Ar+20% CO 2 , and the path of the light spot during welding is shifted by 0.5mm from the splicing path of the two plates to the 2GPa hot-formed steel side.
  • Step (4) After obtaining the tailored laser welded blank, post-weld heat treatment is performed on it, and the heat treatment process is 930° C. for 5 minutes, followed by quenching treatment (water quenching), and finally a quenched laser tailored blank is obtained.
  • Oscillating laser welding of Al-Si-coated steel/high-strength hot-formed steel includes the following steps:
  • Step (1) Select 2.0mm thick aluminum-silicon-coated 22MnB5 steel and 1.5mm-thick 1800MPa hot-formed steel, and remove oil stains with alcohol; the coating thickness of aluminum-silicon coated 22MnB5 steel is 20 ⁇ m to 40 ⁇ m.
  • Step (2) Place the two steel plates on the workbench in the form of splicing, and use a special welding fixture to make the two steel plates in close contact.
  • Step (3) Use the IPG-10kW fiber laser to splicing and welding the test board.
  • the laser power used is 10.0kW
  • the welding speed is 6.0m/min
  • the defocusing amount is 0mm
  • the swing diameter is 6.0mm
  • the spot direction is 1800MPa.
  • the steel side is offset by 2.5mm and the swing frequency is 50Hz.
  • the protective gas used is 100% CO 2
  • the moving path of the spot during welding is the splicing path of two steel plates.
  • Step (4) After obtaining the tailored laser welded blank, heat treatment is performed on it.
  • the heat treatment process is 950° C. for 5 minutes, and then quenched (water quenching) to finally obtain a quenched tailored laser welded blank.
  • the strength of the welded joint can reach more than 1500MPa, and the tensile fracture position appears on the aluminum-silicon-coated steel side. After hot forming, the strength of the aluminum-silicon coating 22MnB5 steel side reaches 1500MPa, and the strength of the high-strength steel side can reach 1800MPa.
  • the microstructure of the entire composite part is lath martensite without other structures.
  • Linear laser welding of Al-Si-coated steel/high-strength hot-formed steel includes the following steps:
  • Step (1) select 1.5mm thick aluminum-silicon-coated 22MnB5 steel and 1.5mm-thick 2GPa hot-formed steel, remove oil stains with alcohol; the coating thickness of aluminum-silicon coated 22MnB5 steel is 20 ⁇ m to 40 ⁇ m.
  • Step (2) Place the two steel plates on the workbench in the form of splicing, and use a special welding fixture to make the two steel plates in close contact.
  • Step (3) Use the IPG-6kW fiber laser to weld the test board, the laser power used is 3.0kW, the welding speed is 5.0m/min, the defocusing amount is +5.0mm, and the shielding gas used is 80% Ar +20% CO 2 , the moving path of the spot during welding is the splicing path of two steel plates.
  • Step (4) After obtaining the tailored laser welded blank, heat treatment is performed on it.
  • the heat treatment process is 930° C. for 5 minutes, and then quenched (water quenching) to finally obtain a quenched tailored laser welded blank.
  • Oscillating laser welding of Al-Si-coated steel/high-strength hot-formed steel includes the following steps:
  • Step (1) select 1.5mm thick aluminum-silicon-coated 22MnB5 steel and 1.5mm-thick 2GPa hot-forming steel, remove oil stains with alcohol; the coating thickness of aluminum-silicon coated 22MnB5 steel is 20 ⁇ m to 30 ⁇ m.
  • Step (2) Place the two steel plates on the workbench in the form of splicing, and use a special welding fixture to make the two steel plates in close contact.
  • Step (3) Use the IPG-6kW fiber laser to weld the test board.
  • the laser power used is 3.0kW
  • the welding speed is 5.0m/min
  • the defocusing amount is +5.0mm
  • the swing diameter is 0.5mm and 0.8 mm
  • the swing frequency is 50Hz.
  • the protective gas used is 80% Ar+20% CO 2
  • the moving path of the spot during welding is the splicing path of two steel plates.
  • Step (4) After obtaining the tailored laser welded blank, heat treatment is performed on it.
  • the heat treatment process is 930° C. for 5 minutes, and then quenched (water quenching) to finally obtain a quenched tailored laser welded blank.
  • Linear laser welding of Al-Si-coated steel/high-strength hot-formed steel includes the following steps:
  • Step (1) select 1.5mm thick aluminum-silicon-coated 22MnB5 steel and 1.5mm-thick 2GPa hot-forming steel, remove oil stains with alcohol; the coating thickness of aluminum-silicon coated 22MnB5 steel is 20 ⁇ m to 30 ⁇ m.
  • Step (2) Place the two steel plates on the workbench in the form of splicing, and use a special welding fixture to make the two steel plates in close contact.
  • Step (3) Use the IPG-6kW fiber laser to weld the test board, the laser power used is 3.0kW, the welding speed is 5.0m/min, the defocusing amount is +5.0mm, and the shielding gas used is 80% Ar +20% CO 2 , the light spot path during welding is offset by 0.5mm from the splicing path of the two plates to the 2GPa hot-formed steel side.
  • Step (4) After obtaining the tailored laser welded blank, post-weld heat treatment is performed on it, and the heat treatment process is 930° C. for 5 minutes, followed by quenching treatment (water quenching), and finally a quenched laser tailored blank is obtained.

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Abstract

La présente invention concerne un procédé de fabrication de pièces en acier composite d'acier plaqué d'aluminium-silicium/acier à haute résistance formé à chaud comprenant les étapes consistant à : fixer une plaque d'acier plaquée d'aluminium-silicium et une plaque d'acier à haute résistance formé à chaud sur une table de travail par épissage, de telle sorte que les deux plaques d'acier sont en contact étroit ; sous une atmosphère protectrice, effectuer un soudage par galvanomètre laser au niveau d'un joint des deux plaques d'acier, de telle sorte que le joint est fondu et solidifié pour former une soudure de haute qualité ; et réaliser un estampage à chaud sur la plaque d'acier soudée pour obtenir une pièce constituée d'acier composite d'acier plaqué d'aluminium-silicium/acier à haute résistance formé à chaud, l'atmosphère protectrice contenant de 5 à 100 % en volume d'un gaz oxydant, et un trajet de déplacement d'un point lumineux est commandé pour être décalé de 0-3 mm vers le côté de la plaque d'acier à haute résistance formé à chaud pendant le soudage par galvanomètre. Le procédé de soudage au laser d'acier plaqué d'aluminium-silicium/acier à haute résistance formé à chaud selon la présente invention permet d'obtenir un bon assemblage entre un acier plaqué d'AI-Si et un autre acier à haute résistance formé à chaud sans retirer une couche de placage Al-Si, d'améliorer les propriétés mécaniques d'un joint de soudure, et de réduire la formation de ferrite δ dans un cordon de soudure.
PCT/CN2020/105539 2020-07-22 2020-07-29 Procédé de fabrication de pièces en acier composite d'acier plaqué d'aluminium-silicium/acier à haute résistance formé à chaud WO2022016594A1 (fr)

Applications Claiming Priority (2)

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CN117259972A (zh) * 2023-09-11 2023-12-22 中国科学院上海光学精密机械研究所 一种热成形钢拼焊部件热压处理方法

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