CN103231154A - Welding method for improving aluminum alloy overlap joint strength - Google Patents
Welding method for improving aluminum alloy overlap joint strength Download PDFInfo
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- CN103231154A CN103231154A CN2013101500039A CN201310150003A CN103231154A CN 103231154 A CN103231154 A CN 103231154A CN 2013101500039 A CN2013101500039 A CN 2013101500039A CN 201310150003 A CN201310150003 A CN 201310150003A CN 103231154 A CN103231154 A CN 103231154A
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Abstract
The invention discloses a welding method for improving the aluminum alloy overlap joint strength. The welding method is suitable for welding of various aluminum alloy overlap joints, wherein each overlapping distance is not smaller than 25mm. A main principle of the welding method is that the effective bearing area of overlapping welds is increased. The welding method mainly comprises the steps of confirming the overlapping distances, arranging straight channel through holes in an upper plate overlapping area along the direction parallel to the welds, performing welding at the positions of the upper plate holes by means of a small-welding-specification welding method after the overlapping welds are welded by means of a conventional welding process, and filling the straight channel through holes. Under the same welding conditions, the strength of the welds obtained by means of the welding method is obviously improved compared with common overlapping welds.
Description
Technical field
The invention belongs to welding technology field, be specially a kind of welding method that improves aluminium alloy lap joint intensity, be applicable to the lap joint of various aluminium alloys and the welding process that overlap distance is not less than 25mm.
Background technology
It is little that aluminium alloy has density, and the specific strength height is nonmagnetic, characteristics such as good anti-corrosion and low-temperature flexibility and formability, and at automobile, Aero-Space are used widely in the industries such as rail train, become a kind of desirable lightweight material.The aluminium alloy welding faces many difficult problems, and the decline of strength of welded joint is serious, and wherein the weld strength coefficient is low is one of sixty-four dollar question.Cause the strength of welded joint main reasons for decrease to be: (1) aluminium alloy thermal conductivity is good, and the sweating heat input is big, under the effect of Thermal Cycle, has formed the softened zone in heat affected area (HAZ); Very easily oxidation when (2) aluminium reaches welding in air, the aluminium oxide (Al of generation
2O
3) fusing point height, highly stable, be difficult for to remove, easily generate slag inclusion, incomplete fusion, defective such as lack of penetration; (3) surface film oxide of aluminium alloy can adsorb a large amount of moisture, easily makes weld seam produce pore, thereby reduces the weld seam loaded area and then cause strength of joint to reduce.
The phenomenon that strength of welded joint descends is more obvious in the overlap joint welding.The overlap joint welding is to adopt lap joint to weld, the i.e. workpiece of two separation (upper plate and lower plate) the joint welding of (not being to being in the same place) that hangs together, the welding of aluminium alloy overlap joint is because it has a common boundary the existence of face, easily oxidation in welding process, be mingled with and problem such as pore thereby produce, the welding parameter variable quantity is many during overlap joint welding simultaneously, and these all can cause the strength factor of aluminium alloy overlap welding joint to reduce.
Summary of the invention
For solving the above-mentioned problems in the prior art, the invention provides a kind of welding method that improves aluminium alloy lap joint intensity.
Technical scheme of the present invention is as follows:
A kind of welding method that improves aluminium alloy lap joint intensity is opened some straight trough through holes before the welding in the overlap joint zone of overlap welding upper plate, after according to conventional method lap weld being finished, in the welding of the straight trough through hole of overlap welding upper plate.
The welding method of preferred above-mentioned raising aluminium alloy lap joint intensity comprises the steps:
The first step: determine overlap distance, and in the overlap joint zone of overlap welding upper plate, open some straight trough through holes along the direction of parallel weld seam; Preferred described straight trough through hole is of a size of: Kong Changdu ≧ 4D, and the hole is wide ≧ D, wherein D is the thickness of overlap welding upper plate; The location determining method of described straight trough through hole is: width, the slotted eye center line of straight trough through hole and overlap central lines; Length direction, the outside, hole of straight trough through hole and the sheet edge Ju Li ≧ 5mm of overlap joint upper plate, and the spacing between the adjacent two straight trough through holes is not less than the hole length of described each straight trough through hole; Remove the oxide-film in overlap welding upper plate and all zones to be welded of overlap welding lower plate clean then, the zone to be welded of cleaning aluminium sheet comprises straight trough through hole hole wall, straight trough through hole and lower plate composition surface, reach straight trough through hole peripheral weld and remove totally at the oxide-film in all interior zones to be welded in the zone in one's power, clean and dry with acetone then;
Second step: adopt the welding technique that meets production environment that lap joint is welded, cooling then, wherein, the described welding technique that meets production environment can be welding (MIG); After the welding point cooling to be overlapped, adopt the welding method of little welding conditions to weld in the straight trough through hole of overlap welding upper plate, and fill up all straight trough through holes; Wherein, the welding method of described little welding conditions can be tungsten inert-gas welding (TIG);
Preferably, also comprised for the 3rd step: check and clear up all weld seams, especially there is not the Welding Problems that influences weldquality in straight trough through hole weld seam to guarantee it.
Compared with prior art, beneficial effect of the present invention is as follows:
The first, under identical welding condition, adopt the intensity of the weld seam that welding method of the present invention obtains to compare common lap weld and be significantly improved;
The second, welding method operation of the present invention is implemented simple.
Certainly, implement arbitrary product of the present invention and might not need to reach simultaneously above-described all advantages.
Description of drawings
Fig. 1 is the overlap welding upper plate of the embodiment of the invention and shape and the welding position schematic diagram of lower plate;
Fig. 2 is the overlap welding upper plate of the embodiment of the invention and the installation diagram of lower plate.
The specific embodiment
The invention discloses a kind of welding method that improves aluminium alloy lap joint intensity, be applicable to the lap joint of various aluminium alloys and the welding process that overlap distance is not less than 25mm.Cardinal principle of the present invention is the effective bearing area that increases lap weld.Welding method key step of the present invention is: determine overlap distance, open some straight trough through holes along parallel bead direction in the overlap joint zone of overlap welding upper plate; After according to conventional welding procedure the lap weld welding being finished, adopt the welding method of little welding conditions to weld in the straight trough through hole of overlap welding upper plate, fill up the straight trough through hole.The present invention will be further described in conjunction with specific embodiments in the below.
Embodiment
In the present embodiment; sheet material to be welded is: upper plate 1 is the A356 aluminum alloy plate materials of 100mm * 85mm * 4mm; lower plate 2 is 7003 aluminum alloy plate materials of 100mm * 85mm * 2mm; welding wire is ER5554; the welding method of lap weld is welding; the welding method of straight trough through hole is manual TIG welding, and protective gas is 99.99% straight argon.
The first step, before the welding, referring to Fig. 1 and Fig. 2, the overlap welding upper plate according to Fig. 2 in dimensioned straight trough through hole 3, the number of straight trough through hole is three in the present embodiment, wherein institute's target size is not used in restriction among Fig. 2.Obviously the present invention can also use other multiple sizes; Remove the oxide-film in all zones to be welded of aluminium sheet clean with sand paper and file then, comprise straight trough through hole hole wall, straight trough through hole and lower plate composition surface, and straight trough through hole peripheral weld is removed clean at the oxide-film in all interior zones to be welded in the zone in one's power, clean and oven dry with acetone then, to be welded;
Second step, implement welding, adopt welding method welded lap weld seam, concrete technological parameter is: electric current 155A, weld fast 700mm/min, 50 ° at welding gun inclination angle, the postwelding air cooling is to room temperature; Then, adopt ER5554 as welding wire, the gas tungsten arc welding method is welded at straight trough through hole 3 places of upper plate 1 by hand, and fills up all straight trough through holes;
The 3rd step after the welding, checked and cleared up all weld seams, and especially there is not the Welding Problems that influences weldquality in straight trough through hole weld seam to guarantee it.
The sample that adopts above welding method to obtain is carried out performance test, specific as follows:
At straight trough via regions vertical weld direction intercepting tensile sample, carry out the tensile strength test, recording sample tensile strength is 117MPa;
Straight trough through hole interval region vertical weld direction in same lap weld intercepts tensile sample in contrast, carries out the tensile strength test, and recording sample tensile strength is 83MPa.
More above-mentioned two data can get, and the intensity of the weld seam that welding method of the present invention obtains is compared common lap weld and is significantly improved, and this method is obvious to the intensity effect that improves lap weld.
Above embodiment about the size of the selecting for use of the size of overlap welding upper plate and lower plate, material, welding wire, straight trough through hole, welding method select for use and concrete selection of process parameters only for illustrating, those skilled in the art are disclosed under the situation of spirit of the present invention according to above-mentioned, can also make multiple choices and distortion, the concrete restriction that should not be construed as for example the present invention program of above-described embodiment.
More than the disclosed preferred embodiment of the present invention just be used for helping to set forth the present invention.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this invention yet and only is the described specific embodiment.Obviously, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain principle of the present invention and practical application better, thereby the technical field technical staff can understand and utilize the present invention well under making.The present invention only is subjected to the restriction of claims and four corner and equivalent.
Claims (7)
1. a welding method that improves aluminium alloy lap joint intensity is characterized in that, opens some straight trough through holes before the welding in the overlap joint zone of overlap welding upper plate, after according to conventional method lap weld being finished, in the welding of the straight trough through hole of overlap welding upper plate.
2. the welding method of raising aluminium alloy lap joint intensity according to claim 1 is characterized in that this method comprises the steps:
(1) before the welding: determine overlap distance, in the overlap joint zone of overlap welding upper plate, open some straight trough through holes along parallel bead direction, clear up the zone to be welded of aluminium sheet then;
(2) implement welding: at first in the welding of lap joint place, then in the welding of the straight trough through hole of overlap welding upper plate.
3. the welding method of raising aluminium alloy lap joint intensity according to claim 1 and 2 is characterized in that, the length of described straight trough through hole is more than or equal to four times of plate thickness in the described overlap welding, and the hole is wider than and equals plate thickness in the described overlap welding.
4. the welding method of raising aluminium alloy lap joint intensity according to claim 1 and 2, it is characterized in that, the location determining method of described straight trough through hole is: the slotted eye center line of its width and overlap central lines, its outside, hole along its length and the Ju Li ≧ 5mm of sheet edge, the spacing between the adjacent two straight trough through holes is not less than hole length.
5. the welding method of raising aluminium alloy lap joint intensity according to claim 2, it is characterized in that, the zone to be welded of described cleaning aluminium sheet comprises straight trough through hole hole wall, straight trough through hole and lower plate composition surface, and straight trough through hole peripheral weld is removed clean at the oxide-film in all interior zones to be welded in the zone in one's power.
6. the welding method of raising aluminium alloy lap joint intensity according to claim 2 is characterized in that, adopts the welding method of little welding conditions to the straight trough through hole welding of overlap welding upper plate, and fills up all straight trough through holes.
7. the welding method of raising aluminium alloy lap joint intensity according to claim 2 is characterized in that, also comprises (3) welding back: check and trimming.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101500039A CN103231154A (en) | 2013-04-26 | 2013-04-26 | Welding method for improving aluminum alloy overlap joint strength |
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| CN2013101500039A CN103231154A (en) | 2013-04-26 | 2013-04-26 | Welding method for improving aluminum alloy overlap joint strength |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858535A (en) * | 2015-05-18 | 2015-08-26 | 上海交通大学 | Connection method for improving strength of overlap joints |
| CN105328310A (en) * | 2015-12-01 | 2016-02-17 | 山东省科学院新材料研究所 | Automatic argon arc slotting and filler wire welding method for magnesium alloy lap welding |
| CN109596425A (en) * | 2019-01-09 | 2019-04-09 | 江西江铃集团新能源汽车有限公司 | A kind of lap joint Evaluation Method of Mechanical Property |
| CN111545866A (en) * | 2016-03-30 | 2020-08-18 | 松下知识产权经营株式会社 | Welding method |
| CN113118601A (en) * | 2021-03-31 | 2021-07-16 | 中车青岛四方机车车辆股份有限公司 | Automatic welding method for railway vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1615686A (en) * | 1921-09-28 | 1927-01-25 | Westinghouse Electric & Mfg Co | Method of welding |
| DE10302019A1 (en) * | 2003-01-21 | 2004-07-29 | Bayerische Motoren Werke Ag | Joint point for motor vehicle bodywork has at least one recess in the component to be welded on, which is completely covered by bead |
| EP1964637A2 (en) * | 2007-02-27 | 2008-09-03 | Sumitomo Light Metal Industries, Ltd. | MIG welded joint between aluminium and steel members and MIG welding process |
-
2013
- 2013-04-26 CN CN2013101500039A patent/CN103231154A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1615686A (en) * | 1921-09-28 | 1927-01-25 | Westinghouse Electric & Mfg Co | Method of welding |
| DE10302019A1 (en) * | 2003-01-21 | 2004-07-29 | Bayerische Motoren Werke Ag | Joint point for motor vehicle bodywork has at least one recess in the component to be welded on, which is completely covered by bead |
| EP1964637A2 (en) * | 2007-02-27 | 2008-09-03 | Sumitomo Light Metal Industries, Ltd. | MIG welded joint between aluminium and steel members and MIG welding process |
Non-Patent Citations (2)
| Title |
|---|
| 中国机械工程学会焊接学会: "《焊接手册》", 31 October 2007, article ""焊接结构"", pages: 33-34 * |
| 本书编委会: "《钢结构工程制作安装便携手册》", 31 January 2007, article ""焊接工艺"", pages: 364 - 365 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858535A (en) * | 2015-05-18 | 2015-08-26 | 上海交通大学 | Connection method for improving strength of overlap joints |
| CN105328310A (en) * | 2015-12-01 | 2016-02-17 | 山东省科学院新材料研究所 | Automatic argon arc slotting and filler wire welding method for magnesium alloy lap welding |
| CN111545866A (en) * | 2016-03-30 | 2020-08-18 | 松下知识产权经营株式会社 | Welding method |
| CN111545866B (en) * | 2016-03-30 | 2022-02-11 | 松下知识产权经营株式会社 | Welding method |
| CN109596425A (en) * | 2019-01-09 | 2019-04-09 | 江西江铃集团新能源汽车有限公司 | A kind of lap joint Evaluation Method of Mechanical Property |
| CN113118601A (en) * | 2021-03-31 | 2021-07-16 | 中车青岛四方机车车辆股份有限公司 | Automatic welding method for railway vehicle |
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Application publication date: 20130807 |