CN110814511A - Method for friction stir welding of aluminum alloy and polypropylene - Google Patents
Method for friction stir welding of aluminum alloy and polypropylene Download PDFInfo
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- CN110814511A CN110814511A CN201911156073.9A CN201911156073A CN110814511A CN 110814511 A CN110814511 A CN 110814511A CN 201911156073 A CN201911156073 A CN 201911156073A CN 110814511 A CN110814511 A CN 110814511A
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- polypropylene
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
- B23K20/126—Workpiece support, i.e. backing or clamping
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
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Abstract
The invention discloses a method for friction stir welding of aluminum alloy and polypropylene, which comprises the following steps: fixing a clean polypropylene plate on a workbench; processing a groove on the surface of a region to be welded of the polypropylene plate, and placing and compacting the powder in the groove; placing and fixing a clean aluminum alloy plate on a polypropylene plate; and (3) enabling the center of the stirring pin of the stirring head to coincide with the center of the groove, starting the welding process, and taking down the workpiece after the welding is finished to finish the welding. The method is simple and convenient in structure, and can effectively solve the problem of low welding efficiency of the dissimilar joint of the aluminum alloy, the polypropylene and other nonpolar polymers.
Description
Technical Field
The invention relates to the field of welding of dissimilar materials, in particular to a method for friction stir welding of aluminum alloy and polypropylene.
Background
In recent years, the development concepts of energy conservation, emission reduction and environmental protection have made higher and higher requirements on the manufacturing industry, and green manufacturing is promoted. Engineering light weight is one of important means for realizing green manufacturing, for example, in the automobile industry, the emission of carbon dioxide can be reduced by 8.5 g for every 100 kg of automobile body weight and every kilometer of automobile running. The more and more the polypropylene is applied to the light weight of automobiles, the application of the polypropylene in the automobile industry can be further expanded by connecting the polypropylene with aluminum alloy. The friction stir welding technology is a novel solid state welding technology developed for aluminum alloy in 1991 by British welding research institute, has the characteristics of simple welding process, high welding efficiency, low cost and low pollution, is a green welding technology, has wide application in the fields of aerospace, locomotive manufacturing, building energy, ships and the like, and is a process with great application prospect in connection of aluminum alloy and polypropylene.
Polypropylene belongs to a non-polar high polymer material, and can not form a bond like a polar high polymer material in the connection process of the polypropylene and metal, and the existing improvement methods for friction stir welding of aluminum alloy and polypropylene mainly comprise two types: one is to coarsen the surface of the aluminum alloy so as to increase the contact area with polypropylene in the welding process; the other is to generate polar functional groups on the surface of polypropylene by treating the surface of polypropylene with electric discharge or the like. However, both methods have the problem of complicated welding process, and the stirring pin is difficult to insert into the surface of the polypropylene plate below the stirring pin during the welding process.
Disclosure of Invention
The invention aims to provide a friction stir welding method for aluminum alloy and polypropylene, which aims to improve welding efficiency and obtain a high-quality welded joint.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a friction stir welding method of aluminum alloy and polypropylene comprises the following steps:
(1) mounting a clean polypropylene workpiece on a workbench and fixing the workpiece by using a clamp;
(2) processing a groove on the surface of a region to be welded of a polypropylene workpiece by a milling cutter, and placing and compacting powder in the groove;
(3) placing a clean aluminum alloy workpiece on a polypropylene workpiece and fixing the aluminum alloy workpiece by using a clamp;
(4) and (3) enabling the center of the stirring pin of the stirring head to coincide with the center of the groove, starting the welding process, and taking down the workpiece after the welding is finished to finish the welding.
Preferably, the depth of the groove ish，h=（0.2~0.6）H，The width of the groove isd，d=（0.8~1.1）D，HIs the thickness of a polypropylene workpiece,Dthe diameter of the stirring pin.
Preferably, the diameter of the stirring head is 20 mm, and the diameter of the stirring needleD=4-6 mm, the length of the stirring pin isl，l=L+（1~1.2）hWherein, in the step (A),Lis the thickness of an aluminum alloy workpiece,his the groove depth.
Preferably, the powder is any one of alumina particles or carbon nanotubes.
Compared with the prior art, the method can effectively improve the friction stir welding efficiency of the aluminum alloy and the polypropylene and obtain a high-quality welding joint. The mode of fluting powder addition can make the pin mixer puncture in the polypropylene that is located the below on the one hand, and on the other hand can increase the heat input to polypropylene board among the welding process through the contact of pin mixer and the powder in the recess and recess edge polypropylene, improves welding efficiency.
Drawings
Fig. 1 is an overall process schematic of the present invention, wherein: 1 is a polypropylene workpiece, 2 is a groove, 3 is an aluminum alloy workpiece, and 4 is a stirring head.
Detailed Description
With reference to fig. 1, the welding process of friction stir welding of aluminum alloy and polypropylene according to the present invention is as follows: (1) the surface of the polypropylene workpiece 1 is subjected to pretreatment such as decontamination, cleaning and the like, then is arranged on a workbench and is fixed by a clamp; (2) processing a groove 2 on the surface of a region to be welded of a polypropylene workpiece 1 by a milling cutter, adding powder into the groove 2 and compacting; (3) cleaning the surface of the aluminum alloy workpiece 3 with alcohol, drying the aluminum alloy workpiece with a blower, placing the aluminum alloy workpiece on the polypropylene workpiece 1, and fixing the two workpieces together with a clamp; (4) the stirring head 4 is arranged on a welding machine and moves to an area to be welded; (5) the center of the stirring pin of the stirring head 4 is coincided with the center of the groove 2, the welding process is started,and after the welding is finished, the workpiece is kept for 30 s, and the welding is finished after the workpiece is taken down. Wherein the content of the first and second substances,h=（0.2~0.6）H，the width of the groove isd，d=（0.8~1.1）D，HIs the thickness of a polypropylene workpiece,Dthe diameter of the stirring pin is 20 mm, the diameter of the stirring head is 20 mmD=4-6 mm, the length of the stirring pin isl，l=L+（1~1.2）hWherein, in the step (A),Lthe thickness of the aluminum alloy workpiece.
Example 1
Taking 5083 aluminum alloy and polypropylene as examples, the stirring head is made of H13 steel, the diameter of the shaft shoulder (the diameter of the stirring head) is 20 mm, the stirring needle is a cylindrical stirring needle, and the length of the stirring needle is equal to that of the cylindrical stirring needlelIs 3.5 mm in diameterDIs 4mm, and the thickness of a 5083 aluminum alloy plateLIs 2 mm, and the thickness of the polypropylene plateHIs 4mm, the width of the groovedIs 3.5 mm in depthhIs 1.5 mm.
The welding process described in this example is as follows:
(1) preprocessing a polypropylene plate by removing oil, ester and the like, placing the polypropylene plate on a workbench, and fixing the polypropylene plate on the workbench by using a clamp;
(2) a milling cutter is used for forming a groove with the width of 3.5 mm and the depth of 1.5 mm on the surface of the polypropylene plate;
(3) putting the alumina particles into the groove and compacting;
(4) cleaning the surface of a 5083 aluminum alloy workpiece with alcohol, drying the workpiece with a blower, placing the workpiece on a polypropylene plate, and fixing the workpiece with a clamp.
(5) Installing the stirring head on a welding machine, moving to a welding position to implement a welding process: and adjusting the welding position to the position to be welded, starting a welding machine, rotating at the welding speed of 800 r/min, at the welding speed of 50 mm/min, pressing down at the welding speed of 0.1 mm, stopping for 30 s after the welding is finished, and taking down the workpiece to finish the welding.
After welding, a tensile property test is carried out by adopting a SANS CMT-5105 electronic universal tensile testing machine according to the GB/T1040-92 standard, and the tensile property test is compared with a sample which is not grooved by adopting the same process parameters, so that the joint strength obtained by adopting the method is improved by 15 percent.
Example 2
Taking 5083 aluminum alloy and polypropylene as examples, the stirring head is made of H13 steel, the diameter of the shaft shoulder is 20 mm, the stirring pin is a cylindrical stirring pin, and the length of the stirring pin is equal to that of the cylindrical stirring pinlIs 3.8 mm in diameterDIs 4mm, and the thickness of a 5083 aluminum alloy plateLIs 2 mm, and the thickness of the polypropylene plateHIs 4mm, the width of the groovedIs 3.2 mm in depthhIs 1.8 mm.
The welding process described in this example is as follows:
(1) preprocessing a polypropylene plate by removing oil, ester and the like, placing the polypropylene plate on a workbench, and fixing the polypropylene plate on the workbench by using a clamp;
(2) a milling cutter is used for forming a groove with the width of 3.2 mm and the depth of 1.8 mm on the surface of polypropylene;
(3) putting the carbon nano tube into the groove and compacting;
(4) cleaning the surface of a 5083 aluminum alloy workpiece with alcohol, drying the workpiece with a blower, placing the workpiece on a polypropylene plate, and fixing the workpiece with a clamp.
(5) Installing the stirring head on a welding machine, moving to a welding position to implement a welding process: and adjusting the welding position to the position to be welded, starting a welding machine, rotating at the welding speed of 800 r/min, at the welding speed of 50 mm/min, pressing down at the welding speed of 0.1 mm, stopping for 30 s after the welding is finished, and taking down the workpiece to finish the welding.
After welding, a tensile property test is carried out by adopting a SANS CMT-5105 electronic universal tensile testing machine according to the GB/T1040-92 standard, and the tensile property test is compared with a sample which is not grooved by adopting the same process parameters, so that the strength of the joint obtained by adopting the method is improved by 25 percent.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (4)
1. A method for friction stir welding of aluminum alloys and polypropylene comprising the steps of:
(1) fixing a clean polypropylene plate on a workbench;
(2) processing a groove on the surface of a region to be welded of the polypropylene plate, and placing and compacting the powder in the groove;
(3) placing and fixing a clean aluminum alloy plate on a polypropylene plate;
(4) and (3) enabling the center of the stirring pin of the stirring head to coincide with the center of the groove, starting the welding process, and taking down the workpiece after the welding is finished to finish the welding.
2. The method of claim 1 wherein the depth of the recess ish，h=（0.2~0.6）H，The width of the groove isd，d=（0.8~1.1）D，HIs the thickness of a polypropylene plate material,Dthe diameter of the stirring pin.
3. The method of claim 1, wherein the stir head has a diameter of 20 mm and the stir pin has a diameterD=4-6 mm, the length of the stirring pin isl，l=L+（1~1.2）hWherein, in the step (A),Lis the thickness of the aluminum alloy plate,his the groove depth.
4. The method of claim 1, wherein the powder is any one of alumina particles or carbon nanotubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911156073.9A CN110814511A (en) | 2019-11-22 | 2019-11-22 | Method for friction stir welding of aluminum alloy and polypropylene |
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| CN201911156073.9A CN110814511A (en) | 2019-11-22 | 2019-11-22 | Method for friction stir welding of aluminum alloy and polypropylene |
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| CN110814511A true CN110814511A (en) | 2020-02-21 |
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Citations (7)
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| JP2009279858A (en) * | 2008-05-23 | 2009-12-03 | Sumitomo Light Metal Ind Ltd | Method of bonding metallic material to resin material and bonded piece of metallic material and resin material |
| CN104936763A (en) * | 2013-01-18 | 2015-09-23 | 日本轻金属株式会社 | Process for producing metal-resin bonded object, and metal-resin bonded object |
| JP2016068128A (en) * | 2014-09-30 | 2016-05-09 | マツダ株式会社 | Method of joining metal member with resin member and resin member used for the same |
| CN105945419A (en) * | 2016-06-24 | 2016-09-21 | 哈尔滨万洲焊接技术有限公司 | Friction deformation-triggered self-propagating assistant aluminum/steel friction stirring overlapping method |
| CN106475677A (en) * | 2016-10-31 | 2017-03-08 | 西北工业大学 | A kind of different alloys T-shaped agitating friction welder with fluting and welding method |
| CN108396163A (en) * | 2018-01-22 | 2018-08-14 | 武汉理工大学 | Carbon nanotube enhances the preparation method of foamed aluminium radical composite material |
| CN109604811A (en) * | 2019-01-16 | 2019-04-12 | 扬州大学 | Method for aluminium alloy and nylon dissimilar material Friction Stir Welding |
-
2019
- 2019-11-22 CN CN201911156073.9A patent/CN110814511A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| JP2009279858A (en) * | 2008-05-23 | 2009-12-03 | Sumitomo Light Metal Ind Ltd | Method of bonding metallic material to resin material and bonded piece of metallic material and resin material |
| CN104936763A (en) * | 2013-01-18 | 2015-09-23 | 日本轻金属株式会社 | Process for producing metal-resin bonded object, and metal-resin bonded object |
| JP2016068128A (en) * | 2014-09-30 | 2016-05-09 | マツダ株式会社 | Method of joining metal member with resin member and resin member used for the same |
| CN105945419A (en) * | 2016-06-24 | 2016-09-21 | 哈尔滨万洲焊接技术有限公司 | Friction deformation-triggered self-propagating assistant aluminum/steel friction stirring overlapping method |
| CN106475677A (en) * | 2016-10-31 | 2017-03-08 | 西北工业大学 | A kind of different alloys T-shaped agitating friction welder with fluting and welding method |
| CN108396163A (en) * | 2018-01-22 | 2018-08-14 | 武汉理工大学 | Carbon nanotube enhances the preparation method of foamed aluminium radical composite material |
| CN109604811A (en) * | 2019-01-16 | 2019-04-12 | 扬州大学 | Method for aluminium alloy and nylon dissimilar material Friction Stir Welding |
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