CN115446453A - Method for producing a coated hot-formed steel part - Google Patents
Method for producing a coated hot-formed steel part Download PDFInfo
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- CN115446453A CN115446453A CN202211138755.9A CN202211138755A CN115446453A CN 115446453 A CN115446453 A CN 115446453A CN 202211138755 A CN202211138755 A CN 202211138755A CN 115446453 A CN115446453 A CN 115446453A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 107
- 239000000945 filler Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 23
- 239000000956 alloy Substances 0.000 claims abstract description 23
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 11
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 30
- 239000000203 mixture Substances 0.000 description 8
- 238000010791 quenching Methods 0.000 description 7
- 230000000171 quenching effect Effects 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
-
- 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
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a method for manufacturing a hot-formed steel part with a coating, which comprises the following steps: providing two steel plates which are not hot-stamped, wherein at least one surface of the steel plate is coated with a coating, and the total thickness of the coating is not more than 20 mu m; in the welding process, a welding seam is formed by melting, mixing and solidifying the filler welding wire and the coated steel plate, and the sum of the weight percentages of other alloy components except iron in the used welding wire is less than 4 percent; after welding, the welded material is pressed to obtain a hot-formed steel member. According to the invention, the coating is not required to be removed before welding, and the welding joint with high strength and high elongation can be obtained only by filling the welding wire in the welding process, so that the safety performance of the automobile is improved.
Description
Technical Field
The invention relates to the field of laser welding, in particular to a method for manufacturing a hot forming steel part with a coating.
Background
A series of problems such as energy shortage, environmental pollution and greenhouse effect are highlighted day by day at present, and research results show that the proportion of transportation departments in global carbon dioxide emission is up to 24%. The adoption of the lightweight technology is one of important means for realizing energy conservation and emission reduction of the automobile and improving the safety of the automobile. The application of the ultra-high strength steel in automobiles can realize the safety of the automobiles and reduce the weight of the automobile bodies. However, cold-forming ultrahigh-strength steel is difficult to form, and it is difficult to obtain parts having complicated shapes.
The hot forming steel is ultrahigh-strength steel which has light weight and safety requirements, has the characteristics of good plasticity, strong forming capability, small rebound quantity and the like at high temperature, has the strength of more than 1500MPa after hot stamping forming, and is widely applied to manufacturing safety structural members such as A columns, B columns, cross beams and the like of automobile bodies. In order to avoid oxidation of the sheet material during the hot press forming process and to improve the surface quality and forming accuracy of the sheet material, the surface is usually pre-coated. The aluminum-silicon coating becomes the most widely applied hot forming steel coating at present by virtue of the advantages of high temperature resistance, low density, wear resistance, high thermal conductivity, small expansion coefficient and the like. When laser welding is adopted, the coating can be melted into a welding seam, more ferrite is generated, and the mechanical property of a welding joint is seriously reduced. Particularly, for hot forming steel with an Al-Si coating of 1500MPa or more, it is very difficult to achieve post-weld tensile strength and elongation up to the base metal level.
In CN 114603255A a method for laser welding coated steel blanks with a filler wire is disclosed, the filler wire being filled with a somewhat reduced formation of brittle intermetallics by means of 16-30 wt.% Cr and 6-22 wt.% Ni. However, this method has significant drawbacks in that the alloy composition of the wire is high, increasing the cost of the wire. In addition, welding wires with high alloy wire compositions have poor weld formation.
CN 106488824B discloses a method for joining two blanks, which adopts a laser-arc composite welding process to fill a welding wire containing 5-22 wt% of Cr and 6-20 wt% of Ni, so as to improve the tensile strength of a joint. However, the heat input of this method is too large, which easily causes deformation of the thin plates during welding. In addition, when welding wires with too high alloy components are used for welding steel plates with coatings of thickness of 20 μm or less, fusion lines of welding joints are easy to fail, and the mechanical properties of the joints are poor.
CN 112548395A discloses a welding wire for laser filler wire welding, a preparation method and a tailor-welded blank manufacturing process, wherein the welding wire containing 0.50-0.90 wt% of C, 8-15 wt% of Ni and 3-6 wt% of Cr is filled by adopting the laser filler wire welding process, so that the tensile strength of a joint is improved. However, the welding wire has high contents of C and Ni, and is liable to be unevenly distributed in the weld, resulting in poor component uniformity of the weld and unstable mechanical properties of the weld.
In CN 113710404A a method for fusion welding of one or more steel plates made of die-formable hardened steel is disclosed, by using a laser beam combined with two spots, comprising a small spot and a large spot, the large spot being 2-3 times the small spot. The welding wire containing 4-25 wt% of Cr and 5-12 wt% of Ni is filled in the laser welding process, so that the welding quality is improved. However, the welding method has high requirements on laser power, and the alloy component content of the welding wire is high, so that the production cost is increased.
Further, when welding a coated hot-formed steel having a thickness of 20 μm or less with the filled wire having the above composition, the welded joint is liable to fail near the weld line after hot stamping, and the elongation of the welded joint is significantly reduced, and the welded joint cannot meet the standard of use.
Therefore, there is a need in the art to develop a welding wire suitable for coating hot forming steel with a thickness of 20 μm or less, which can meet the use requirements, ensure the mechanical properties of the welded joint to be consistent, and reduce the cost.
Disclosure of Invention
To solve the above problems, the present invention provides a method for manufacturing a coated hot formed steel part for laser welding a coated hot formed steel having a thickness of 20 μm or less, which avoids the problems of poor weld formation and low elongation due to failure of a joint at a weld line caused by excessively high weld alloy composition.
The invention proposes a method for manufacturing a coated hot-formed steel part, comprising the following steps:
providing two steel plates which are not hot-stamped, wherein at least one surface of the steel plate is coated with a coating, the composition of the coating mainly comprises Al element, and the total thickness of the coating is not more than 20 μm;
welding the coated steel plate, wherein a welding seam is formed by melting, mixing and solidifying a filler wire and the coated steel plate in the welding process, wherein the filler wire contains Fe and other alloy elements, and the total weight percentage of the other alloy element components except Fe is less than 4%;
after the welding is completed, the welded article is hot stamped to obtain a hot formed steel part.
Preferably, the sum of the weight percentages of the other alloy components in the filler wire is less than 2.5%.
Preferably, after the welding part is subjected to hot stamping, the total thickness of the coating is 6-26 μm; the base layer is an outer layer, the compound layer is an inner layer, and an intermediate layer is arranged between the base layer and the compound layer.
Preferably, the inner, intermediate and outer layers are characterized as follows:
the components of the inner layer are Al, si and alpha-Fe, wherein the weight percentage of Al is less than 30 percent,
the intermediate layer is an intermetallic compound of Fe, al and Si, wherein the Al content is 52-70%,
the outer layer is an intermetallic compound of Fe, al and Si, wherein the Al content is 30-52%.
Preferably, the total thickness of the coating is 5-14 μm, the base layer is an Al alloy layer, and the compound layer is a FeAlSi inhibition layer.
Preferably, the other alloy components in the filler wire contain at least Cu element,
preferably, the tensile strength of the Cu element in the filler wire and the filler wire satisfies a reverse difference strength formula Td of 400 Td 1200, and the Td calculation formula is a mathematical formula (1):
Td＝1000·(0.3-a)+Ts (1)
in the above formula, a is the weight percentage value of Cu element in the welding wire, and Ts is the tensile strength of the welding wire.
Preferably, the weight percentage of Cu in the filler wire is 0.18 to 0.5%.
Preferably, the filler wire further comprises one or more of the elements Cr, ni or Mo, wherein the weight percentage of Cr is less than 0.5%, the weight percentage of Ni is less than 1%, and the weight percentage of Mo is less than 0.5%.
Preferably, the sum of the weight percentages of Cr, ni and Mo in the filler wire is 0.1-1.48%.
Preferably, the sum of the weight percentages of Cr, ni and Mo in the filler wire is 0.1-1%.
Preferably, the welding wire further contains Mn and Si elements, wherein the sum of the weight percentages of Mn and Si is less than 2.5%.
Preferably, the sum of the weight percentages of Mn and Si in the filler wire is less than 1.5%.
Preferably, the weight percentage of the Ti element in the filler wire is 0.01-0.5%.
Preferably, the weight percentage of the Ni element in the filler wire is 0.1-0.95%.
Preferably, the weight percentage of the Cr element in the filler wire is 0-0.48%.
Preferably, the filler wire also contains C element, and the weight percentage of the C element is 0.05-0.55.
Preferably, the weight percentage of the C element in the filler wire is 0.05-0.25.
Preferably, the diameter of the filler wire is 40 to 60 times the total thickness of the coating.
Preferably, the percentage of the average Al element in the weld is 0.1 to 1.2%.
Preferably, the hot stamping means that the blank after being welded together is placed into a high-temperature furnace at 700-1000 ℃ for heating in a manual or mechanical transfer mode, the temperature is kept for 2-6 minutes, and then the welded plate at high temperature is transferred and quenched in a mechanical transfer mode.
Preferably, the quenching mode is die hot press quenching, and the die hot press quenching refers to that the tailor-welded blank with the high temperature is placed on a die with a water cooling system for stamping and forming.
Preferably, the quenching manner further comprises water quenching and oil quenching.
Preferably, the heat source for melting the filler wire, the coating layer and the steel plate in the welding method is an arc or a laser.
The principle of action of the wire used for laser welding coated hot formed steels of thickness below 20 μm is as follows:
(1) The Cu element in the welding wire can obviously improve the corrosion resistance of the welding wire and can improve the strength of a welding seam.
(2) The total content of alloy elements in the welding wire is low, the components of the welding wire can be mixed with the base metal more uniformly in the welding process, the segregation is reduced, and the weld forming is improved.
(3) The welding wire contains at least one element of Mo, cr and Ni, wherein the Mo element can improve the hardenability and the heat strength of the welding seam and refine crystal grains, the Cr element can prevent the welding seam from being oxidized during high-temperature heat treatment and improve the oxidation resistance, and the Ni element can effectively inhibit the formation of ferrite in the welding seam.
(4) Mn element in the welding wire can enlarge an austenite phase region and inhibit the generation of ferrite; si element in the welding wire can promote the flow of a molten pool; the Ti element in the welding wire improves the corrosion resistance and the welding performance of the welding wire.
Compared with the welding method mentioned in the prior art, the invention has the beneficial effects that:
1) The coating is not required to be pretreated before welding, so that the working procedures and cost caused by pretreatment of the coating are reduced.
2) Can realize the high-efficiency and high-quality welding of the hot forming steel with the coating with the thickness of 20 mu m or less.
3) And under high-speed welding, the mechanical property stability of the welding joint is high.
4) The lower alloy components in the welding wire can be mixed with the base metal more uniformly in the welding process, the element segregation of the welding line near the fusion line is reduced, the welding line forming is improved, and the stability of the mechanical property of the welding joint is improved.
5) The low alloy composition wire significantly reduces the cost of production of the wire compared to high alloy composition wires.
6) The Cu element in the welding wire can improve the corrosion resistance of the welding wire and can also improve the strength of a welding seam.
7) The welding wire contains at least one element of Mo, cr and Ni, wherein the Mo element can improve the hardenability and the heat strength of the welding seam and refine crystal grains, the Cr element can prevent the welding seam from being oxidized during high-temperature heat treatment and improve the oxidation resistance, and the Ni element can effectively inhibit the formation of ferrite in the welding seam.
8) And protective gas is not needed in the welding process, so that the welding cost is reduced.
By using the technical scheme of the invention, the application requirements of the laser welding joint performance of the hot forming steel with the thickness of 20 mu m or less and the coating of 1500MPa level or above can be met. On the premise of ensuring the welding quality, the welding efficiency and the safety performance of the vehicle can be improved, and the production cost is reduced.
Drawings
The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. It is to be noted that the appended drawings are intended as examples of the claimed invention.
Fig. 1 shows stress-strain curves of a typical weld joint 1, a weld joint 2, and a weld joint of comparative example 1 in examples of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the following examples. The examples are intended only to illustrate the features and technical advantages of the present invention and do not limit the scope of the present invention.
Coating characteristics of coated steel sheet
At least one surface of the steel sheet is coated with a coating layer containing an Al element, and the total thickness of the coating layer is not more than 20 μm;
after hot punching, the total thickness of the coating is 6-26 μm; the base layer is an outer layer, the compound layer is an inner layer, and an intermediate layer is arranged between the base layer and the compound layer.
The characteristics of the inner, intermediate and outer layers are as follows:
the components of the inner layer are Al, si and alpha-Fe, wherein the weight percentage of Al is less than 30 percent,
the intermediate layer is an intermetallic compound of Fe, al and Si, wherein the Al content is 52-70%,
the outer layer is an intermetallic compound of Fe, al and Si, wherein the Al content is 30-52%.
Preferably, two coated hot-formed steel sheets which are not hot-stamped are provided, at least one surface of the hot-formed steel sheet is coated with a coating layer, the total thickness of the coating layer is 5 to 14 μm, the base layer is an Al alloy layer, and the compound layer is a FeAlSi inhibition layer.
Example 1:
a method of manufacturing a component of al-si coated hot formed steel comprising the steps of:
s1, taking two non-stamped hot-formed steel plates with coatings, wherein the thickness of each steel plate is 1.4mm, the total thickness of the coatings of the steel is 13-17 mu m, and the microstructure of a steel matrix is mainly ferrite and pearlite;
s2, selecting welding wires with the sum of the weight ratios of alloy elements except iron being 2-3%; the percentage weight ratio of Cu element in the alloy elements is 0.18-0.5%, the sum of the percentage weight ratios of Ni, cr and Mo elements is less than 1%, and the sum of the percentage weight ratios of Mn and Si elements is less than 1.5%;
s3, using the welding wire as a filler wire, and melting, mixing and solidifying the filler wire and the coated steel plate to form a welding seam in the welding process, wherein the welding speed is 2.4m/min;
and S4, placing the jointed steel plates in a high-temperature furnace at 930-950 ℃ for heating, preserving heat for 3-5 min, and then transferring for quenching.
Example 2: unlike example 1, the welding speed was 1.75 times that of example one.
Example 3: different from the embodiment 1, the welding wire comprises the following chemical components: 0.09 wt% of C,0.56 wt% of Si,1.82 wt% of Mn,0.55 wt% of Ni + Mo, and the balance Fe and inevitable impurities.
Example 4: different from the embodiment 1, the welding wire comprises the following chemical components: 0.08% by weight of C, 0.58% by weight of Si, 1.65% by weight of Mn, 0.45% by weight of Mo, 0.02% by weight of Ti element, and the balance Fe and unavoidable impurities.
Example 5: different from the embodiment 1, the chemical composition content of the welding wire is as follows: 0.09 wt% of C,0.59 wt% of Si,1.52 wt% of Mn,1.32 wt% of Ni + Mo + Cr, and the balance Fe and unavoidable impurities.
Example 6: different from the embodiment 1, the welding wire comprises the following chemical components: 0.08 wt% of C,0.52 wt% of Si,1.45 wt% of Mn,1.35 wt% of Ni + Mo + Cr, and the balance Fe and unavoidable impurities.
Example 7: different from the embodiment 1, the welding wire comprises the following chemical components: 0.08% by weight of C, 0.63% by weight of Si, 1.7% by weight of Mn, 0.94% by weight of Ni + Mo, 0.1% by weight of Ti element, and the balance Fe and unavoidable impurities.
The tensile strength of the welded joints of the above examples is greater than 1400MPa, and the elongation is greater than 5%.
Comparative example 1: as a comparative example of example 1, a hot-formed steel plate with a coating of the same specification was selected and welded, and a welding wire having a total of 20% by weight of alloy elements other than iron was selected, and the welded joint had a tensile strength of 1387.1MPa and an elongation of 1.63%, and broke at the weld line.
Under the conventional technical scheme in the field, for hot forming steel with the coating thickness of less than or equal to 20 mu m and the grade of 1500MPa, the requirement of meeting the mechanical property of the laser welding joint is difficult to realize. The conventional technical scheme in the field has the problems that welding seams are poor in forming and joints are prone to failure on fusion lines due to the fact that welding wire alloy components are too high. According to the technical effect of the technical scheme, the welding wire can obtain a welding joint with excellent mechanical property at different welding speeds, the tensile strength is more than 1400MPa, and the elongation is more than 5%.
Therefore, according to the embodiment and the comparative example of the invention, the technical scheme of the invention can meet the requirements of high-efficiency and high-quality welding of the hot forming steel with the coating thickness of less than or equal to 20 μm and the grade of 1500MPa and above, and has wide usability and high consistency.
The terms and expressions which have been employed herein are used as terms of description and not of limitation. The use of such terms and expressions is not intended to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications may be made within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
Also, it should be noted that although the present invention has been described with reference to the current specific embodiments, it should be understood by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention, and therefore, it is intended that all changes and modifications to the above embodiments be included within the scope of the claims of the present application.
Claims (9)
1. A method of making a coated thermoformed steel part comprising:
providing two steel plates which are not hot-stamped, wherein at least one surface of the steel plate is coated with a coating containing an Al element, and the total thickness of the coating is not more than 20 μm;
welding the two steel plates which are not subjected to hot stamping, and forming a welding seam by melting, mixing and solidifying a filler wire, the coating and the steel plates;
after welding is finished, performing hot stamping on the welded part to obtain a hot-formed steel part; it is characterized in that the preparation method is characterized in that,
the filler wire comprises Fe and other alloy elements, and the sum of the weight percentages of the other alloy element components except Fe is less than 4%.
2. The method of claim 1, wherein: the other alloy elements in the filler wire at least contain Cu element.
3. The method of claim 2, wherein: the Cu element in the filler wire and the tensile strength of the filler wire meet the inverse difference strength formula T d T is more than or equal to 400 d ≤1200，T d The calculation formula is mathematical formula (1):
T d ＝1000·(0.3-a)+T s (1)
in the above formula, a is the weight percentage value of Cu element in the welding wire, T s Is the tensile strength of the wire.
4. A method according to claim 2 or 3, characterized in that: the weight percentage of Cu element in the filler wire is 0.18-0.5%.
5. The method according to claim 1 or 2, characterized in that: the other alloying elements in the filler wire contain one or more of Cr, ni or Mo elements, wherein the weight percentage of Cr is less than 0.5%, the weight percentage of Ni is less than 1%, and the weight percentage of Mo is less than 0.5%.
6. The method of claim 5, wherein: the sum of the weight percentages of the Cr, the Ni and the Mo is 0.1 to 1.48 percent.
7. The method according to claim 1 or 2, characterized in that: the other alloy elements in the filler wire also contain Mn and Si, wherein the sum of the weight percentages of Mn and Si is less than 2.5 percent.
8. The method according to claim 1 or 2, characterized in that: other alloy elements in the filler wire also contain Ti element, and the weight percentage of the Ti element is 0.01-0.5%.
9. The method of claim 1, wherein: in the implementation of welding, the welding speed is not less than 2.4m/min.
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| CN104994989A (en) * | 2012-11-19 | 2015-10-21 | 威斯克激光拼焊板有限公司 | Method for laser welding one or more workpieces of hardenable steel with a butt joint using a filler wire |
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