CN115446453B - 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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- CN115446453B CN115446453B CN202211138755.9A CN202211138755A CN115446453B CN 115446453 B CN115446453 B CN 115446453B CN 202211138755 A CN202211138755 A CN 202211138755A CN 115446453 B CN115446453 B CN 115446453B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 135
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 239000000945 filler Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 26
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 22
- 239000000956 alloy Substances 0.000 claims abstract description 22
- 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 12
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 238000005275 alloying Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 34
- 239000000203 mixture Substances 0.000 description 11
- 229910052759 nickel Inorganic materials 0.000 description 7
- 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
- 239000011247 coating layer Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 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
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000010953 base metal 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
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 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
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- 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
Landscapes
- 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 coated hot formed steel part, comprising the steps of: providing two steel plates which are not subjected to hot stamping, wherein at least one surface of each 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 line is formed by melting, mixing and solidifying a filling welding wire and a coated steel plate, wherein 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 part is punched to obtain a hot-formed steel part. 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 through the filler wire in the welding process, so that the safety performance of an automobile is improved.
Description
Technical Field
The invention relates to the field of laser welding, in particular to a method for manufacturing a hot formed steel part with a coating.
Background
The current energy shortage, environmental pollution, greenhouse effect and other problems are increasingly prominent, and research results show that the proportion of transportation departments in global carbon dioxide emission is up to 24%. The adoption of the light weight technology is one of important means for realizing energy conservation and emission reduction of the automobile and improving the safety of the automobile. The ultra-high strength steel is applied to the automobile, so that the automobile safety can be realized, and the weight of the automobile body can be reduced. However, cold forming of ultra-high strength steel is difficult, and it is difficult to obtain parts of complex shape.
The hot forming steel is ultra-high strength steel with light weight and safety requirements, has the characteristics of good plasticity, strong forming capability, small rebound quantity and the like at high temperature, has strength of more than 1500MPa after hot stamping forming, and is widely applied to manufacturing of safety structural members such as A columns, B columns, beams and the like of a car body. In order to avoid oxidation of the sheet during hot stamping and to improve the surface quality and forming accuracy of the sheet, a coating is usually preformed on the surface of the sheet. The aluminum-silicon coating is the most widely used hot forming steel coating at present by virtue of the advantages of high temperature resistance, low density, abrasion resistance, high thermal conductivity, small expansion coefficient and the like. When laser welding is adopted, the coating can be melted into a welding line, more ferrite is generated, and the mechanical property of a welding joint is seriously reduced. Particularly for hot forming steels of the order of 1500MPa and above for aluminum-silicon coatings, it is very difficult to achieve post-weld tensile strength and elongation to the base material level.
In CN 114603255A a method of laser welding coated steel blanks with a filler wire is disclosed, the filling of which wire reduces the formation of brittle intermetallic compounds to a certain extent by 16-30 wt.% Cr and 6-22 wt.% Ni of the filler wire. However, this method has obvious drawbacks in that the alloy composition of the welding wire is high, increasing the cost of the welding wire. In addition, the welding seam of the welding wire with high alloy welding wire composition is poor in forming.
In CN 106488824B a method for joining two blanks is disclosed, by filling a welding wire containing 5-22 wt% Cr and 6-20 wt% Ni by using a laser arc composite welding process, the tensile strength of the joint is improved. However, this method has an excessive heat input, which tends to cause deformation of the thin plate during welding. In addition, welding wires with too high alloy components are easy to cause the failure of a welding line of a welding joint when being welded on a steel plate with a coating with the thickness of 20 mu m or less, so that the mechanical property of the joint is deteriorated.
In CN 112548395A, a welding wire for laser filler wire welding, a preparation method and a welding plate manufacturing process are disclosed, 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 the joint is improved. However, the welding wire has higher C and Ni contents, is easy to be unevenly distributed in the welding line, and causes poor consistency of components of the welding line and unstable mechanical property of the welding line.
In CN 113710404A a method of fusion welding one or more steel sheets made of a press hardenable steel is disclosed by using a laser beam with a combination of two spots, comprising one small spot and one large spot, the large spot being 2-3 times the small spot. The welding wire containing 4-25 wt% Cr and 5-12 wt% 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 welding wire has higher alloy component content, so that the production cost is increased.
In addition, when a hot-formed steel having a coating layer of 20 μm or less is welded with the filled welding wire, the welding joint is likely to fail in the vicinity of the weld line after hot stamping, and the elongation of the welding joint is severely reduced, so that the use standard cannot be satisfied.
Therefore, there is a need in the art to develop a welding wire that is suitable for coating hot-formed steel having a thickness of 20 μm or less, and that can also be effective in satisfying the requirements of use and ensuring consistent mechanical properties of the welded joint.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for manufacturing a hot-forming steel part with a coating, which is used for laser welding hot-forming steel with a coating thickness of 20 mu m or less, and solves the problems of poor weld forming and low extension caused by failure of a joint at a welding line due to over-high weld alloy composition.
The invention proposes a method of manufacturing a coated hot formed steel part comprising the steps of:
providing two steel plates which are not subjected to hot stamping, wherein at least one surface of each steel plate is coated with a coating, the components of the coating mainly comprise Al element, and the total thickness of the coating is not more than 20 mu m;
welding the coated steel plate, and forming a welding seam by melting, mixing and solidifying a filling welding wire and the coated steel plate in the welding process, wherein the filling welding wire contains Fe and other alloy elements, and the welding seam is characterized in that the sum of the weight percentages of the other alloy element components except Fe is less than 4%;
after the welding is completed, the welded part is subjected to hot stamping, and a hot formed steel part is obtained.
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 piece is subjected to hot stamping, the total thickness of the coating is 6-26 mu m; 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 layer, the intermediate layer and the outer layer are characterized as follows:
the inner layer comprises Al, si and alpha-Fe, wherein the weight percentage of the 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 content of Al is 30-52%.
Preferably, the total thickness of the coating is 5-14 mu m, 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 satisfy a reverse difference strength formula Td of 400-1200, and the Td calculation formula is a mathematical formula (1):
Td＝1000·(0.3-a)+Ts (1)
in the 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 0.18-0.5%.
Preferably, the filler wire further contains 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%.
Preferably, the sum of the weight percentages of Cr, ni and Mo in the filling welding wire is 0.1-1.48%.
Preferably, the sum of the weight percentages of Cr, ni and Mo in the filling welding 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 Ti element in the filler wire is 0.01-0.5%.
Preferably, the weight percentage of Ni element in the filler wire is 0.1-0.95%.
Preferably, the weight percentage of Cr element in the filling welding 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 filling welding wire is 0.05-0.25.
Preferably, the diameter of the filler wire is 40-60 times of the total thickness of the coating.
Preferably, the percentage of the average Al element in the weld is 0.1-1.2%.
Preferably, the hot stamping refers to that the blank after the tailor-welded blank is put into a high-temperature furnace with the temperature of 700-1000 ℃ for heating in a manual or mechanical transfer mode, and is kept for 2-6 minutes, and then the high-temperature tailor-welded blank is transferred and quenched in a mechanical transfer mode.
Preferably, the quenching mode is die hot press quenching, and the die hot press quenching means that the high-temperature splice welding plate is placed on a die with a water cooling system for stamping forming.
Preferably, the quenching mode further comprises water quenching and oil quenching.
Preferably, the heat source for melting the filler wire, coating and steel plate in the welding method is an arc or a laser.
The principle of action of the welding wire for laser welding coated hot-formed steel having a thickness of 20 μm or less 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 the welding seam.
(2) The total content of alloy elements in the welding wire is small, and the components of the welding wire can be mixed with the base metal more uniformly in the welding process, so that segregation is reduced, and the weld joint forming is improved.
(3) The welding wire contains at least one element of Mo, cr and Ni, the Mo element can improve the hardenability and the heat strength of the welding seam, grains are thinned, the Cr element can prevent the welding seam from being oxidized during the high-temperature heat treatment, the oxidation resistance is improved, 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 ferrite; the 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 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 the cost caused by the pretreatment of the coating are reduced.
2) Can realize high-efficiency and high-quality welding of hot forming steel with a coating thickness of 20 mu m or less.
3) Under high-speed welding, the stability of the mechanical property of the welded joint is high.
4) The lower alloy components in the welding wire can be more uniformly mixed with the base metal in the welding process, so that element segregation of the welding line near the welding 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 welding wire significantly reduces the production cost of the welding wire as compared to the high alloy composition welding wire.
6) The Cu element in the welding wire can improve the corrosion resistance of the welding wire and the strength of the welding seam.
7) The welding wire contains at least one element of Mo, cr and Ni, the Mo element can improve the hardenability and the heat strength of the welding seam, grains are thinned, the Cr element can prevent the welding seam from being oxidized during the high-temperature heat treatment, the oxidation resistance is improved, and the Ni element can effectively inhibit the formation of ferrite in the welding seam.
8) And shielding gas is not required in the welding process, so that the welding cost is reduced.
By using the technical scheme of the invention, the laser welding joint performance application requirements of the hot forming steel with the thickness of 20 mu m and below and the coating with the thickness of 1500MPa level and above can be met. On the premise of ensuring welding quality, the welding efficiency and the safety performance of the vehicle can be improved, and the production cost is reduced.
Drawings
The foregoing and other aspects of the invention will be better understood when read in conjunction with the following drawings. It is to be noted that the drawings are merely 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 the examples of the present invention.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the present invention will be further described in detail with reference to examples. The examples are only intended 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 plate is coated with a coating layer containing Al element, and the total thickness of the coating layer is not more than 20 mu m;
after hot stamping, the total thickness of the coating is 6-26 mu m; the basic layer is an outer layer, the compound layer is an inner layer, and an intermediate layer is arranged between the basic layer and the compound layer.
The inner layer, intermediate layer and outer layer are characterized as follows:
the inner layer comprises 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 content of Al is 30-52%.
Preferably, two hot stamped coated hot formed steel sheets 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 5-14 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 aluminum silicon coated hot formed steel comprising the steps of:
s1, taking two non-punched 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 mainly comprises ferrite and pearlite;
s2, selecting a welding wire with the weight ratio of alloy elements except iron being 2-3%; the weight ratio of Cu element in the alloy element is 0.18-0.5%, the sum of the weight ratio of Ni, cr and Mo elements is less than 1%, and the sum of the weight ratio of Mn and Si elements is less than 1.5%;
s3, using the welding wire as a filling welding wire, and forming a welding line by melting, mixing and solidifying the filling welding wire and a coated steel plate in the welding process, wherein the welding speed is 2.4m/min;
s4, placing the joined steel plates into a high-temperature furnace at 930-950 ℃ for heating, preserving heat for 3-5 min, and then transferring to quenching.
Example 2: unlike example 1, the welding speed was 1.75 times that of example one.
Example 3: unlike example 1, the chemical composition content of the welding wire is as follows: 0.09 wt% C,0.56 wt% Si,1.82 wt% Mn,0.55 wt% Ni+Mo, the balance being Fe and unavoidable impurities.
Example 4: unlike example 1, the chemical composition content of the welding wire is as follows: 0.08 wt% of C,0.58 wt% of Si,1.65 wt% of Mn,0.45 wt% of Mo,0.02 wt% of Ti element, and the balance of Fe and unavoidable impurities.
Example 5: unlike example 1, the chemical composition content of the welding wire is as follows: 0.09 wt% C,0.59 wt% Si,1.52 wt% Mn,1.32 wt% Ni+Mo+Cr, the balance being Fe and unavoidable impurities.
Example 6: unlike example 1, the chemical composition content of the welding wire is as follows: 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 of Fe and unavoidable impurities.
Example 7: unlike example 1, the chemical composition content of the welding wire is as follows: 0.08 wt% of C,0.63 wt% of Si,1.7 wt% of Mn,0.94 wt% of Ni+Mo,0.1 wt% of Ti element, and the balance of Fe and unavoidable impurities.
The tensile strength of the welded joint of the embodiment is more than 1400MPa, and the elongation is more than 5%.
Comparative example 1: as a comparative example of example 1, a coated hot-formed steel sheet of the same specification was used for welding, and a welding wire having a total of more than 20% by weight of alloying elements other than iron was used, and the welded joint had a tensile strength of 1387.1MPa, an elongation of 1.63% and a fracture at the weld line.
Under the conventional technical scheme in the field, it is difficult to achieve the requirements of mechanical properties of laser welded joints for hot-formed steel of 1500MPa and above with a coating thickness of 20 μm or less. The conventional technical scheme in the field has the problems that the welding seam is poor in forming and the joint is easy to fail in a welding line due to the fact that the alloy composition of the welding wire is too high. From the technical effects of the technical scheme, the welding wire can obtain the welding joint with excellent mechanical properties 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, the technical scheme of the invention can meet the requirement of high-efficiency and high-quality welding of the hot forming steel with the coating thickness of less than or equal to 20 mu m and with the grade of 1500MPa and above, and has wide applicability 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 these terms and expressions is not meant to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications are possible and are intended to be included 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 while the present invention has been described with reference to the particular embodiments presently, it will be appreciated by those skilled in the art that the above embodiments are provided for illustration only and that various equivalent changes or substitutions may be made without departing from the spirit of the invention, and therefore, the changes and modifications to the above embodiments shall fall within the scope of the claims of the present application as long as they are within the true spirit of the invention.
Claims (4)
1. A method of manufacturing a coated, thermoformed steel component comprising:
providing two steel plates which are not hot stamped, wherein at least one surface of the steel plates is coated with a coating containing Al element, and the total thickness of the coating is not more than 20 mu m;
welding the two non-hot stamped steel plates, and forming a welding line by melting, mixing and solidifying the filler wire, the coating and the steel plates;
after welding is completed, carrying out hot stamping on the welding piece to obtain a hot formed steel part; it is characterized in that the method comprises the steps of,
the filler wire comprises Fe and other alloy elements, wherein the sum of the weight percentages of other alloy element components except Fe is less than 4%;
other alloy elements in the filler wire at least contain Cu element;
the weight percentage of Cu element in the filler welding wire is 0.18-0.5%;
the other alloy 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%;
the sum of the weight percentages of Cr, ni and Mo is 0.1-1.48%;
the other alloy elements in the filler wire also contain Mn and Si elements, wherein the sum of the weight percentages of Mn and Si is less than 2.5 percent.
2. The method according to claim 1, characterized in that: the Cu element in the filler wire and the tensile strength of the filler wire meet a reverse difference strength formula T d Satisfy T of 400-less d ≤1200，T d The calculation formula is a mathematical formula (1):
T d =1000·（0.3-a）+T s （1）
wherein a is the weight percentage value of Cu element in the welding wire, T s Is the tensile strength of the welding wire.
3. The method of claim 1, wherein the other alloying elements in the filler wire further comprise 0.01-0.5 wt% of Ti.
4. The method according to claim 1, characterized in that: in the implementation of welding, the welding speed is not less than 2.4m/min.
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| CN111230301A (en) * | 2019-03-29 | 2020-06-05 | 宝山钢铁股份有限公司 | Method for manufacturing steel thin-wall welding and other strong parts with aluminum or aluminum alloy coating |
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| CN113798669A (en) * | 2021-09-27 | 2021-12-17 | 中国科学院上海光学精密机械研究所 | Laser welding method for hot forming steel with coating |
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