CN116441717A - Laser welding method with composite powder as interlayer filler - Google Patents
Laser welding method with composite powder as interlayer filler Download PDFInfo
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- CN116441717A CN116441717A CN202310478677.5A CN202310478677A CN116441717A CN 116441717 A CN116441717 A CN 116441717A CN 202310478677 A CN202310478677 A CN 202310478677A CN 116441717 A CN116441717 A CN 116441717A
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- 239000000843 powder Substances 0.000 title claims abstract description 82
- 238000003466 welding Methods 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000945 filler Substances 0.000 title claims abstract description 16
- 239000011229 interlayer Substances 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 24
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 18
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 244000137852 Petrea volubilis Species 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 24
- 239000010959 steel Substances 0.000 description 24
- 229910052782 aluminium Inorganic materials 0.000 description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 19
- 239000010949 copper Substances 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 5
- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 229910015370 FeAl2 Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910018594 Si-Cu Inorganic materials 0.000 description 1
- 229910008465 Si—Cu Inorganic materials 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention relates to the technical field of dissimilar metal laser welding, in particular to a laser welding method taking composite powder as an interlayer filler, which comprises the following steps of preparing the interlayer composite powder; pretreating two substrates to be welded; uniformly coating the prepared intermediate layer composite powder on the lap joint surface of the corresponding base material to be welded; and welding the two substrates to be welded in a laser welding mode. The welding process is stable after the composite powder is added, the welding seam is formed attractive, the defects such as splashing and cracks are avoided, the welding efficiency is obviously improved, and the mechanical property of the joint is obviously improved; the preparation process of the powder is simple, and expensive equipment and complicated procedures are not needed.
Description
Technical Field
The invention relates to the technical field of dissimilar metal laser welding, in particular to a laser welding method using composite powder as an interlayer filler.
Background
The aluminum alloy has the advantages of small specific gravity, high specific strength, strong corrosion resistance, easy recovery and regeneration and the like, is widely applied in the field of automobile industry, and the use amount of the aluminum alloy in the automobile industry is rapidly increased along with the development of aluminum alloy technology and the requirement of automobile light weight in recent years. The traditional steel material is mainly applied to automobile structural parts and safety parts due to the characteristic of high strength, and is a main material in automobile manufacturing. The aluminum alloy has the advantages of low cost, high plasticity and toughness, reliable performance and the like, but the weight of the steel is 3 times of that of the aluminum alloy under the same volume. The aluminum/steel integrated structural member has the characteristics of light weight, high strength and corrosion resistance, and has important significance for weight reduction and performance improvement of automobiles. Therefore, the high-quality and high-efficiency connection of the aluminum/steel heterogeneous materials is realized, and the aluminum/steel integrated structural member is used for replacing a single steel material structural member, so that the problem to be solved in the automobile industry is urgent at present, and the aluminum/steel heterogeneous material high-efficiency connection has a wide development prospect.
The laser welding has the advantages of high energy density, good heat source controllability, small welding deformation, capability of obtaining a weld with a larger depth-to-width ratio, attractive weld and the like, but because of larger difference of physical properties such as the heat conductivity, the linear expansion coefficient and the like of aluminum steel, brittle Fe-Al intermetallic compounds are easy to generate after welding, and the mechanical property of the joint is deteriorated. In addition, aluminum steel laser welding has another problem in that aluminum alloy has strong reflection of laser, resulting in lower laser utilization rate in welding. It is therefore desirable to invent an auxiliary welding process to address both of these issues.
Referring to the prior related technical literature, the addition of proper alloy elements between aluminum and steel can prevent the direct contact of aluminum and steel to a certain extent, regulate and control the generation of an interface Fe-Al intermetallic compound phase, thereby improving the mechanical property of the joint. However, not all alloy elements have the effect, and researches show that the addition of Cu foil (Yang Xudong, rock and Liu Jia. The influence of a copper foil intermediate layer on the quality of an aluminum/steel dissimilar metal laser butt welding joint) between aluminum and steel can inhibit the diffusion of Al to a steel side welding seam, reduce the precipitation of second phase particles in the welding seam, reduce the excessive aggregation of Fe element in the welding seam, and generate brittle phases at the same time, so that the mechanical property of the joint is reduced; alloy powders composed of various alloying elements such as Fe-B-Si powder (Wang Xiaohong, gu Xiaoyan, sun Da thousand. Research on interface characteristics of steel/aluminum dissimilar metal laser welding head), alSiCu powder (Dong H G, huW J, duan Y P, et Al Dissimilar metal joining of aluminum alloy to galvanized steel with Al-Si, al-Cu, al-Si-Cu and Zn-Al filer, etc. can be added to make the aluminum/steel interface to be flat, and the thickness of IMC is remarkably reduced.
The chinese patent with application number CN114918542A, CN115138936a describes a method of adding a powder containing nano ceramic particles to an intermediate layer of a laser welding of a dissimilar material, which can increase the laser absorptivity, increase the weld depth, improve the welding efficiency, refine the weld grains, and inhibit the formation of thermal cracks in the joint. However, this method has problems in that: in aluminum steel welding, due to unmatched physical and chemical properties of the nano ceramic and the matrix material, the suitability problem exists between the nano reinforcing phase and the reinforced matrix when the welding line is solidified, and the bonding interface is easy to become a crack source.
Aiming at the problems, the invention provides a method for performing laser welding by adding composite powder prepared by mixing AlSiCu powder and nano Mo powder on an aluminum steel overlap joint surface as an intermediate layer, wherein the AlSiCu powder can enable a weld joint interface to be flat and reduce the thickness of IMC, and compared with nano ceramic particles, the nano Mo powder has higher compatibility with a matrix material, so that the laser absorptivity is increased and the penetration width of a weld joint is increased; and the plasticity and toughness of deposited metal can be improved, brittle fracture can be reduced, and the mechanical property of the welded joint can be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a laser welding method using composite powder as an intermediate layer filler, which solves the problems related to weld formation and improves the mechanical properties of an aluminum alloy/steel welding joint.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the invention discloses a laser welding method using composite powder as interlayer filler, which comprises the following steps,
(1) Preparing an intermediate layer composite powder;
(2) Pretreating two substrates to be welded;
(3) Uniformly coating the prepared intermediate layer composite powder on the lap joint surface of the corresponding base material to be welded;
(4) And welding the two substrates to be welded in a laser welding mode.
The preparation method of the composite powder in the step (1) comprises the following steps: adding nano Mo powder into AlSiCu powder according to a set mass ratio, and mixing the two powders with acetone.
The mass ratio of AlSiCu powder in the composite powder is 85% -99.9%, and the mass ratio of nano Mo powder is 0.1% -15%.
The mass ratio of AlSiCu powder in the composite powder is 95% -99%, and the mass ratio of nano Mo powder is 1% -5%.
The AlSiCu alloy powder comprises Al-12% Si-2% Cu, and the purity of the nano Mo powder is more than 99.99%.
The welding base materials in the step (2) are low carbon steel and aluminum alloy respectively.
The pretreatment in the step (2) adopts a mechanical cleaning and chemical cleaning mode to remove oxide films and impurities on the surface of the aluminum alloy, fine sand paper is firstly used for polishing the part to be welded before welding, then NaOH solution with the mass fraction of 5% is used for soaking for 2min, HNO3 solution with the mass fraction of 30% is used for soaking for 1min, finally running water is used for cleaning for 30s, and drying is carried out for later use. The low-carbon steel plate is treated in a mechanical cleaning mode, 400# and 800# sand paper is firstly adopted to polish the part to be welded, then acetone is used for soaking to remove oil stains on the surface, flowing water is used for flushing, and drying is carried out for standby.
The low-carbon steel is lapped above the aluminum alloy to form a lapping surface, and the welding position is positioned in the middle of the lapping surface of the low-carbon steel and the aluminum alloy.
The parameters of the laser welding in the step (4) comprise that the laser power is 700-1000W, the welding speed is 0.04-0.09m/s, the defocusing amount is (-1) - (+4) mm, the shielding gas is argon, and the air flow is 20L/min by adopting a side blowing mode; the laser head is offset by 2-10 deg. along the vertical laser travelling direction.
The invention has the beneficial effects that:
the welding process is stable after the composite powder is added, the welding seam is attractive in shape, the defects such as splashing and cracks are avoided, and the welding efficiency is obviously improved. The mechanical property of the joint is obviously improved; meanwhile, the weld joint area structure is thinned, columnar crystals are changed into fine equiaxed crystals, the interface IMCs are orderly arranged, the shape is gentle, the thickness is reduced, and the microhardness of the weld joint area and the tensile shear force of the joint are remarkably improved.
The preparation process of the composite powder is simple, and expensive equipment and complicated procedures are not needed.
Drawings
FIG. 1 is a front view of a weld provided by a second embodiment of the present invention;
FIG. 2 is a metallographic view of a lap joint provided by a second embodiment of the present invention;
fig. 3 is an SEM image of an interface provided by a second embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
see fig. 1-3.
The invention discloses a laser welding method using composite powder as interlayer filler, which comprises the following steps,
(1) Preparing an intermediate layer composite powder;
(2) Pretreating two substrates to be welded;
(3) Uniformly coating the prepared intermediate layer composite powder on the lap joint surface of the corresponding base material to be welded;
(4) And welding the two substrates to be welded in a laser welding mode.
Further, the preparation method of the composite powder in the step (1) comprises the following steps: adding nano Mo powder into AlSiCu powder according to a set mass ratio, and mixing the two powders with acetone.
Further, the mass ratio of AlSiCu powder in the composite powder is 95% -99%, and the mass ratio of nano Mo powder is 1% -5%.
Further, the AlSiCu alloy powder has a composition of Al-12% Si-2% Cu, a nano Mo powder purity of more than 99.99% and a size of 100nm.
Further, the welding base materials in the step (2) are DC06 low carbon steel and Al-Mg-Si series 6016 aluminum alloy respectively.
Further, in the step (2), the oxidation film and impurities on the surface of the aluminum alloy are removed by adopting a mechanical cleaning and chemical cleaning mode, the part to be welded is polished by fine sand paper before welding, then soaked for 2min by using a NaOH solution with the mass fraction of 5%, soaked for 1min by using a HNO3 solution with the mass fraction of 30%, finally washed for 30s by running water, and dried for later use. The low-carbon steel plate is treated in a mechanical cleaning mode, 400# sand paper and 800# sand paper are firstly adopted to polish the part to be welded, then acetone is used for soaking to remove oil stains on the surface, flowing water is used for washing, and drying is carried out for standby; the composite powder is uniformly paved on the lapping surface on the aluminum alloy, the low carbon steel is lapped above the aluminum alloy to form the lapping surface, the lapping length is 16mm in a lapping mode of 'steel upper aluminum lower', and the welding position is positioned in the middle of the lapping surface and the middle of the two lapping surfaces at the welding position in the middle of the lapping surface. The method comprises the steps of enabling laser power to be 700-1000W, enabling welding speed to be 0.04-0.09m/s, enabling defocusing amount to be (-1) - (+4) mm, enabling shielding gas to be argon, and enabling air flow to be 20L/min in a side blowing mode; the laser head is offset by 2-10 deg. along the vertical laser travelling direction.
The invention will be further illustrated by the following examples
Example 1
The base material is DC06 low carbon steel with the thickness of 105mm multiplied by 45mm multiplied by 0.8mm and Al-Mg-Si series 6016 aluminum alloy with the thickness of 105mm multiplied by 45mm multiplied by 0.8mm, the middle layer is AlSiCu powder and nano Mo powder which are made into 99% AlSiCu 1% Mo composite powder, the base material is polished by sand paper and then is washed and dried by acetone, and then the base material is fixed in a lap joint mode of 'steel upper aluminum lower' and the lap joint length is 16mm. The laser process parameters are that the laser power is 900W, the welding speed is 0.07 m/s, the defocusing amount is +2mm, the shielding gas is 99.99 percent of argon, and the laser head deviates 5 degrees along the vertical laser advancing direction by adopting a side blowing mode. The tensile shear was measured to be 78.4N/mm using a universal stretcher.
Example 2
The base material is DC06 low carbon steel with the thickness of 105mm multiplied by 45mm multiplied by 0.8mm and Al-Mg-Si series 6016 aluminum alloy with the thickness of 105mm multiplied by 45mm multiplied by 0.8mm, the middle layer is AlSiCu powder and nano Mo powder which are made into 97% AlSiCu 3% Mo composite powder by mass ratio, the base material is washed with acetone and dried after being polished by sand paper, and then the base material is fixed in a lap joint mode of 'steel upper aluminum lower' with the lap joint length of 16mm. The laser process parameters are that the laser power is 900W, the welding speed is 0.07 m/s, the defocusing amount is +2mm, the shielding gas is 99.99 percent of argon, and the laser head deviates 5 degrees along the vertical laser advancing direction by adopting a side blowing mode. The tensile shear force is 82.3N/mm by using a universal stretcher.
Example 3
The base material is DC06 low carbon steel with the thickness of 105mm multiplied by 45mm multiplied by 0.8mm and Al-Mg-Si series 6016 aluminum alloy with the thickness of 105mm multiplied by 45mm multiplied by 0.8mm, the middle layer is AlSiCu powder and nano Mo powder which are made into 95% AlSiCu 5% Mo composite powder, the base material is polished by sand paper and then is washed and dried by acetone, and then the base material is fixed in a lap joint mode of 'steel upper aluminum lower' and the lap joint length is 16mm. The laser process parameters are that the laser power is 900W, the welding speed is 0.07 m/s, the defocusing amount is +2mm, the shielding gas is 99.99 percent of argon, and the laser head deviates 5 degrees along the vertical laser advancing direction by adopting a side blowing mode. The tensile shear force is 77.6N/mm by using a universal stretcher.
From the data of the above examples, 0.8mm thick low carbon steel and aluminum alloy are adopted, al-12% Si-2% Cu powder and nano Mo powder with purity of more than 99.99% are added in a lap joint mode of 'steel upper aluminum lower', and composite powder prepared by uniformly mixing according to different mass ratios is used as an intermediate layer for laser welding. Si and Cu elements are dissolved into intermetallic compounds such as FeAl2, fe2Al and the like, diffusion channels of Fe and Al atoms are blocked to a certain extent, so that formation of the Fe-Al intermetallic compounds is inhibited, brittleness of the Fe-Al intermetallic compounds can be improved by Mo, meanwhile, the size of interfacial needle-like IMC is reduced, arrangement is more orderly, and microhardness and tensile shear force of a welding line area are improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes or direct or indirect application in the relevant art utilizing the present specification and drawings are included in the scope of the present invention.
Claims (9)
1. A laser welding method using composite powder as an interlayer filler is characterized by comprising the following steps: comprises the following steps of the method,
(1) Preparing an intermediate layer composite powder;
(2) Pretreating two substrates to be welded;
(3) Uniformly coating the prepared intermediate layer composite powder on the lap joint surface of the corresponding base material to be welded;
(4) And welding the two substrates to be welded in a laser welding mode.
2. A laser welding method using composite powder as interlayer filler according to claim 1, wherein: the preparation method of the composite powder in the step (1) comprises the following steps: adding nano Mo powder into AlSiCu powder according to a set mass ratio, and mixing the two powders with acetone.
3. A laser welding method using composite powder as interlayer filler according to claim 2, wherein: the mass ratio of AlSiCu powder in the composite powder is 85% -99.9%, and the mass ratio of nano Mo powder is 0.1% -15%.
4. A laser welding method using composite powder as interlayer filler according to claim 3, wherein: the mass ratio of AlSiCu powder in the composite powder is 95% -99%, and the mass ratio of nano Mo powder is 1% -5%.
5. A laser welding method using composite powder as interlayer filler according to claim 4, wherein: the AlSiCu alloy powder comprises Al-12% Si-2% Cu, and the purity of the nano Mo powder is more than 99.99%.
6. A laser welding method using composite powder as interlayer filler according to claim 1, wherein: the welding base materials in the step (2) are low carbon steel and aluminum alloy respectively.
7. A laser welding method using composite powder as interlayer filler according to claim 6, wherein: the pretreatment in the step (2) adopts a mechanical cleaning and chemical cleaning mode to remove oxide films and impurities on the surface of the aluminum alloy, fine sand paper is firstly used for polishing the part to be welded before welding, then NaOH solution with the mass fraction of 5% is used for soaking for 2min, HNO3 solution with the mass fraction of 30% is used for soaking for 1min, finally running water is used for cleaning for 30s, and drying is carried out for later use. The low-carbon steel plate is treated in a mechanical cleaning mode, 400# and 800# sand paper is firstly adopted to polish the part to be welded, then acetone is used for soaking to remove oil stains on the surface, flowing water is used for flushing, and drying is carried out for standby.
8. A laser welding method using composite powder as interlayer filler according to claim 7, wherein: the low-carbon steel is lapped above the aluminum alloy to form a lapping surface, and the welding position is positioned in the middle of the lapping surface of the low-carbon steel and the aluminum alloy.
9. A laser welding method using composite powder as interlayer filler according to claim 8, wherein: the parameters of the laser welding in the step (4) comprise that the laser power is 700-1000W, the welding speed is 0.04-0.09m/s, the defocusing amount is (-1) - (+4) mm, the shielding gas is argon, and the air flow is 20L/min by adopting a side blowing mode; the laser head is offset by 2-10 deg. along the vertical laser travelling direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310478677.5A CN116441717A (en) | 2023-04-28 | 2023-04-28 | Laser welding method with composite powder as interlayer filler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310478677.5A CN116441717A (en) | 2023-04-28 | 2023-04-28 | Laser welding method with composite powder as interlayer filler |
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| Publication Number | Publication Date |
|---|---|
| CN116441717A true CN116441717A (en) | 2023-07-18 |
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