CN102601516A - Double-side symmetric friction stir welding method - Google Patents
Double-side symmetric friction stir welding method Download PDFInfo
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- CN102601516A CN102601516A CN2012100881132A CN201210088113A CN102601516A CN 102601516 A CN102601516 A CN 102601516A CN 2012100881132 A CN2012100881132 A CN 2012100881132A CN 201210088113 A CN201210088113 A CN 201210088113A CN 102601516 A CN102601516 A CN 102601516A
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Abstract
The invention relates to a friction stir welding method, in particular to a double-side symmetric friction stir welding method, which solves the technical problems of asymmetric structure and mechanical properties, root defects, difficulty in clamping, easiness in breakage of a self-sustaining friction stir welding stirring pin, and low welding efficiency and joint property of a single-side friction stir welding joint. The method includes: firstly, fixing workpieces to be welded onto a worktable and positioning the workpieces on the same horizontal plane; secondly, plunging two stirring heads into the two workpieces respectively at the same rotation speed omega in the same or opposite rotation directions to reach preset positions; and thirdly, welding the workpieces to be welded by the aid of the two stirring heads at the same welding speed. By means of adjusting the rotation directions of an upper shaft shoulder and a lower shaft shoulder, flow of materials can be improved, functional asymmetry of heat engines on two sides of the cross section of a joint is eliminated, the mechanical property of the joint is improved, the two stirring heads are used for acting on the upper surfaces and the lower surfaces of the workpieces to be welded respectively to avoid the root defects, and the two stirring heads simultaneously generate heat so that welding efficiency can be remarkably improved.
Description
Technical field
The present invention relates to a kind of friction stir welding method.
Background technology
Friction stir welding (FSW) is a kind of novel solid phase interconnection technique of Britain's institute of welding (TWI) exploitation in 1991; Compare with traditional melting welding; It has the welding quality height, production cost is low and advantage such as non-environmental-pollution, has been successfully applied to fields such as space flight, aircraft manufacturing and railway transportation at present.This welding method usually is on a face of materials to be welded, to carry out, thereby is called the single face friction stir welding.The deficiency that the single face friction stir welding exists is: the stirring-head shaft shoulder only acts on workpiece surface in the welding process, causes the asymmetric of suffered hot machine effect of on thickness direction materials to be welded and weld seam form, thereby reduces joint mechanical property; In joint cross section advance side; The relative velocity of stirring-head and materials to be welded is stirring-head rotational line speed and speed of welding sum; And it is the poor of stirring-head rotational line speed and speed of welding retreating side; Cause the asymmetric of suffered hot machine effect in joint cross section both sides and weld seam form, reduced the bearing capacity of joint; In addition, also possibly there is the root defect that is difficult to detect in joint, and causes potential safety hazard; Because workpiece needs the back backing plate of given shape in the welding process, the difficulty that is installed is big, and the equipment rigidity requirement is higher.
In order to solve above-mentioned subproblem, the someone has developed a kind of self-sustaining friction stir welding method.In this method, stirring-head adopts upper and lower two shaft shoulders, and the following shaft shoulder is driven by mixing needle, two shaft shoulders in the same way, the constant speed rotation.Because mixing needle bears bigger tension, moment of torsion and moment of flexure in the welding process, causes mixing needle very easily to rupture, big limitations its speed of welding and range of application.In addition,, also can increase the anisopleural degree of joint cross section weld seam, thereby reduce the bearing capacity of joint because the direction of rotation of upper and lower two shaft shoulders is identical.
Summary of the invention
It is asymmetric to the invention solves single face friction stir welding tissue and mechanical property, has root defect, and difficulty is installed; Self-sustaining friction stir welding mixing needle easy fracture; Welding efficiency is low, and the technical problem that joint performance is not high provides a kind of two-sided symmetrical friction stir welding method.
Two-sided symmetrical friction stir welding method is following:
One, with first welded piece 3 and second welded piece, 4 usefulness clamps on workbench, first welded piece 3 docked with second welded piece 4 and be in same horizontal plane;
Two, with stirring-head 1 and stirring-head 2 with identical rotary speed ω, identical or opposite direction of rotation respectively from the upper and lower surface of first welded piece 3 and second welded piece 4 with the identical speed v that penetrates
zPenetrate the weld start position of 4 of first welded piece 3 and second welded pieces, the degree of depth that the shaft shoulder surface of stirring-head 1 and stirring-head 2 is pressed into 4 of first welded piece 3 and second welded pieces is h;
Three, stirring-head 1 and stirring-head 2 are with identical speed of welding v
xAlong the interface length direction walking of first welded piece 3 and second welded piece 4, till welding is accomplished.
Stirring-head 1 described in the above-mentioned steps two is identical with the physical dimension of stirring-head 2; Stirring-head 1 described in the step 2 is in symmetrical position with stirring-head 2 with respect to first welded piece 3 and second welded piece 4.
The present invention has the following advantages: one, two stirring-heads produce the heat effect and the mechanism of symmetry with respect to welded piece in the welding process, thereby change the weld seam form, improve mechanical property; Two, through the direction of rotation of upper and lower two shaft shoulders of adjustment, can improve material and flow, eliminate the asymmetry of the hot machine effect in both sides on the joint cross section, improve joint mechanical property; Three, adopt two stirring-heads to act on the upper and lower surface of welded piece respectively, avoid the generation of root defect; Four, two stirring-head heat production simultaneously can significantly improve welding efficiency; Five, do not need the back backing plate in the welding process, reduce the workpiece requirement that is installed; Six, can effectively eliminate the asymmetry of the hot machine effect of joint cross section and arranged on left and right sides, improve the weld seam form, improve joint mechanical property.
Description of drawings
Fig. 1 be in the specific embodiment one step 2 stirring-head 1 and stirring-head 2 with the identical speed v that penetrates
zPenetrate the weld start position process sketch map of 4 of first welded piece 3 and second welded pieces; Fig. 2 is stirring-head 1 in the specific embodiment one, stirring-head 2 and first welded piece 3 and the relative position sketch map of second welded piece 4 when welding; Fig. 3 is stirring-head 1 in the specific embodiment five, stirring-head 2 and first welded piece 3 and the relative position sketch map of second welded piece 4 when welding; Fig. 4 is that the experiment in the specific embodiment six adopts symmetrical friction stir welding method that aluminium alloy is welded the two-sided symmetrical friction stir welding cross section macro morphology of the typical aluminium alloy that obtains.
The specific embodiment
Technical scheme of the present invention is not limited to the following cited specific embodiment, also comprises the combination in any between each specific embodiment.
The specific embodiment one: the two-sided symmetrical friction stir welding method of this embodiment is following:
One, with first welded piece 3 and second welded piece, 4 usefulness clamps on workbench, first welded piece 3 docked with second welded piece 4 and be in same horizontal plane;
Two, with stirring-head 1 and stirring-head 2 with identical rotary speed ω, identical direction of rotation respectively from the upper and lower surface of first welded piece 3 and second welded piece 4 with the identical speed v that penetrates
zPenetrate the weld start position of 4 of first welded piece 3 and second welded pieces, the degree of depth that the shaft shoulder surface of stirring-head 1 and stirring-head 2 is pressed into 4 of first welded piece 3 and second welded pieces is h;
Three, stirring-head 1 and stirring-head 2 are with identical speed of welding v
xAlong the interface length direction walking of first welded piece 3 and second welded piece 4, till welding is accomplished.
This embodiment has the following advantages: one, two stirring-heads produce the heat effect and the mechanism of symmetry with respect to welded piece in the welding process, thereby change the weld seam form, and are as shown in Figure 4, thereby improve mechanical property; Two, through the direction of rotation of upper and lower two shaft shoulders of adjustment, can improve material and flow, eliminate the asymmetry of the hot machine effect in both sides on the joint cross section, improve joint mechanical property; Three, adopt two stirring-heads to act on the upper and lower surface of welded piece respectively, avoid the generation of root defect; Four, two stirring-head heat production simultaneously can significantly improve welding efficiency; Five, do not need the back backing plate in the welding process, reduce the workpiece requirement that is installed.
The specific embodiment two: this embodiment and the specific embodiment one are different is that the physical dimension of stirring-head described in the step 21 and stirring-head 2 is identical.Other is identical with the specific embodiment one.
The specific embodiment three: what this embodiment was different with the specific embodiment one or two is stirring-head 1 described in the step 2 and stirring-head 2 are in symmetry with respect to first welded piece 3 and second welded piece 4 position.Other is identical with the specific embodiment one or two.
The specific embodiment four: the two-sided symmetrical friction stir welding method of this embodiment is following:
One, with first welded piece 3 and second welded piece, 4 usefulness clamps on workbench, first welded piece 3 docked with second welded piece 4 and be in same horizontal plane;
Two, with stirring-head 1 and stirring-head 2 with identical rotary speed ω, opposite direction of rotation respectively from the upper and lower surface of first welded piece 3 and second welded piece 4 with the identical speed v that penetrates
zPenetrate the weld start position of 4 of first welded piece 3 and second welded pieces, the degree of depth that the shaft shoulder surface of stirring-head 1 and stirring-head 2 is pressed into 4 of first welded piece 3 and second welded pieces is h;
Three, stirring-head 1 and stirring-head 2 are with identical speed of welding v
xAlong the interface length direction walking of first welded piece 3 and second welded piece 4, till welding is accomplished.
The specific embodiment five: this embodiment and the specific embodiment four are different is that the physical dimension of stirring-head described in the step 21 and stirring-head 2 is identical.Other is identical with the specific embodiment four.
The specific embodiment six: what this embodiment was different with the specific embodiment four or five is stirring-head 1 described in the step 2 and stirring-head 2 are in symmetry with respect to first welded piece 3 and second welded piece 4 position.Other is identical with the specific embodiment four or five.
This embodiment adopts following method validation effect of the present invention:
Two-sided symmetrical friction stir welding method is following:
One, with first welded piece 3 (aluminium alloy) and second welded piece 4 (aluminium alloy) with clamps on workbench, first welded piece 3 docked with second welded piece 4 and be in same horizontal plane;
Two, with stirring-head 1 and stirring-head 2 with identical rotary speed ω, opposite direction of rotation respectively from the upper and lower surface of first welded piece 3 and second welded piece 4 with the identical speed v that penetrates
zPenetrate the weld start position of 4 of first welded piece 3 and second welded pieces, the degree of depth that the shaft shoulder surface of stirring-head 1 and stirring-head 2 is pressed into 4 of first welded piece 3 and second welded pieces is h;
Three, stirring-head 1 and stirring-head 2 are with identical speed of welding v
xAlong the interface length direction walking of first welded piece 3 and second welded piece 4, till welding is accomplished.
This embodiment has the following advantages: one, two stirring-heads produce the heat effect and the mechanism of symmetry with respect to welded piece in the welding process, thereby change the weld seam form, and are as shown in Figure 4, thereby improve mechanical property; Two, through the direction of rotation of upper and lower two shaft shoulders of adjustment, can improve material and flow, eliminate the asymmetry of the hot machine effect in both sides on the joint cross section, improve joint mechanical property; Three, adopt two stirring-heads to act on the upper and lower surface of welded piece respectively, avoid the generation of root defect; Four, two stirring-head heat production simultaneously can significantly improve welding efficiency; Five, do not need the back backing plate in the welding process, reduce the workpiece requirement that is installed.
Claims (6)
1. two-sided symmetrical friction stir welding method is characterized in that two-sided symmetrical friction stir welding method is following:
One, with first welded piece (3) and second welded piece (4) with clamps on workbench, first welded piece (3) docked with second welded piece (4) and be in same horizontal plane;
Two, with stirring-head (1) and stirring-head (2) with identical rotary speed ω, identical direction of rotation respectively from the upper and lower surface of first welded piece (3) and second welded piece (4) with the identical speed v that penetrates
zPenetrate the weld start position between first welded piece (3) and second welded piece (4), the degree of depth that the shaft shoulder surface of stirring-head (1) and stirring-head (2) is pressed between first welded piece (3) and second welded piece (4) is h;
Three, stirring-head (1) and stirring-head (2) are with identical speed of welding v
xAlong the interface length direction walking of first welded piece (3), till welding is accomplished with second welded piece (4).
2. according to the said two-sided symmetrical friction stir welding method of claim 1, it is characterized in that stirring-head described in the step 2 (1) is identical with the physical dimension of stirring-head (2).
3. according to claim 1 or 2 said two-sided symmetrical friction stir welding methods, it is characterized in that stirring-head described in the step 2 (1) and stirring-head (2) are in the position of symmetry with respect to first welded piece (3) and second welded piece (4).
4. two-sided symmetrical friction stir welding method is characterized in that two-sided symmetrical friction stir welding method is following:
One, with first welded piece (3) and second welded piece (4) with clamps on workbench, first welded piece (3) docked with second welded piece (4) and be in same horizontal plane;
Two, with stirring-head (1) and stirring-head (2) with identical rotary speed ω, opposite direction of rotation respectively from the upper and lower surface of first welded piece (3) and second welded piece (4) with the identical speed v that penetrates
zPenetrate the weld start position between first welded piece (3) and second welded piece (4), the degree of depth that the shaft shoulder surface of stirring-head (1) and stirring-head (2) is pressed between first welded piece (3) and second welded piece (4) is h;
Three, stirring-head (1) and stirring-head (2) are with identical speed of welding v
xAlong the interface length direction walking of first welded piece (3), till welding is accomplished with second welded piece (4).
5. according to the said two-sided symmetrical friction stir welding method of claim 4, it is characterized in that stirring-head described in the step 2 (1) is identical with the physical dimension of stirring-head (2).
6. according to claim 4 or 5 said two-sided symmetrical friction stir welding methods, it is characterized in that stirring-head described in the step 2 (1) and stirring-head (2) are in the position of symmetry with respect to first welded piece (3) and second welded piece (4).
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| CN103920986A (en) * | 2014-05-05 | 2014-07-16 | 北京理工大学 | Stir friction both-side welding method for medium-thickness plate |
| CN105263665A (en) * | 2013-02-01 | 2016-01-20 | 氟石科技公司 | Friction stir welding devices and methods using tandem tool and anvil |
| CN106660167A (en) * | 2014-06-25 | 2017-05-10 | 三菱重工业株式会社 | Method and device for friction stir welding |
| CN106925883A (en) * | 2017-03-23 | 2017-07-07 | 西安交通大学 | The radially superimposed formula agitating friction welding of large thick-wall ring increases material forming technology |
| CN106925884A (en) * | 2017-03-23 | 2017-07-07 | 西安交通大学 | The axially stacked formula agitating friction welding of large thin-wall ring increases material forming technology |
| CN107150166A (en) * | 2017-06-21 | 2017-09-12 | 西安交通大学 | A kind of thermal source assisted recombination formula twin shaft needleless dynamic agitation friction welding method |
| CN107150167A (en) * | 2017-06-21 | 2017-09-12 | 西安交通大学 | A kind of chuck is powered assisted recombination formula twin shaft dynamic agitation friction welding method |
| CN107199394A (en) * | 2017-06-21 | 2017-09-26 | 西安交通大学 | A kind of stirring-head is powered assisted recombination formula Double shaft stirring friction welding method |
| CN107199395A (en) * | 2017-06-21 | 2017-09-26 | 西安交通大学 | A kind of resistance thermal source assisted recombination formula twin shaft needleless friction stir welding method |
| TWI611853B (en) * | 2015-03-23 | 2018-01-21 | 艾姆勒車電股份有限公司 | Friction stir welding device and method of friction stir welding |
| CN108581179A (en) * | 2018-08-09 | 2018-09-28 | 湖南文理学院 | A kind of double-shaft shoulder reduces the agitating friction weldering of axial force |
| CN108817651A (en) * | 2018-09-06 | 2018-11-16 | 合肥工业大学 | A kind of aluminium alloy plate welding method |
| CN109070262A (en) * | 2016-03-31 | 2018-12-21 | 杰富意钢铁株式会社 | The friction stirring connecting method and device of structural steel |
| CN109070261A (en) * | 2016-03-31 | 2018-12-21 | 杰富意钢铁株式会社 | The friction stirring connecting method and device of structural steel |
| US10286481B2 (en) | 2012-11-05 | 2019-05-14 | Fluor Technologies Corporation | FSW tool with graduated composition change |
| CN109822208A (en) * | 2019-03-20 | 2019-05-31 | 北京赛福斯特技术有限公司 | A kind of Double-head double-side efficient rate agitating friction soldering equipment and its welding method |
| CN110587105A (en) * | 2019-09-27 | 2019-12-20 | 南昌航空大学 | High-efficiency liquid-phase-assisted solid-phase diffusion spot welding method for aluminum/magnesium dissimilar metal |
| CN110997212A (en) * | 2017-08-01 | 2020-04-10 | 杰富意钢铁株式会社 | Method and apparatus for double-sided friction stir welding of metal plates |
| CN112192015A (en) * | 2020-09-22 | 2021-01-08 | 王书杰 | Method for preparing aluminum alloy composite material |
| CN113579462A (en) * | 2021-08-26 | 2021-11-02 | 天津大学 | Method for optimizing technological parameters of bilateral simultaneous friction stir welding |
| CN113714622A (en) * | 2021-09-16 | 2021-11-30 | 山东大学 | Friction-stirring double-sided Z-shaped butt/lap composite welding method for medium-thickness plate heterogeneous material and application |
| TWI748660B (en) * | 2019-09-25 | 2021-12-01 | 日商杰富意鋼鐵股份有限公司 | Double-sided friction stir welding method, cold rolled steel strip and plated steel strip manufacturing method, double-sided friction stir welding device, cold rolled steel strip and plated steel strip manufacturing equipment |
| CN113909671A (en) * | 2021-10-27 | 2022-01-11 | 中铝萨帕特种铝材（重庆）有限公司 | Double-sided friction stir welding system |
| CN114101893A (en) * | 2021-10-18 | 2022-03-01 | 上海友升铝业股份有限公司 | Aluminum alloy double-sided friction stir welding process |
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| CN109822208A (en) * | 2019-03-20 | 2019-05-31 | 北京赛福斯特技术有限公司 | A kind of Double-head double-side efficient rate agitating friction soldering equipment and its welding method |
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| CN113579462A (en) * | 2021-08-26 | 2021-11-02 | 天津大学 | Method for optimizing technological parameters of bilateral simultaneous friction stir welding |
| CN113714622A (en) * | 2021-09-16 | 2021-11-30 | 山东大学 | Friction-stirring double-sided Z-shaped butt/lap composite welding method for medium-thickness plate heterogeneous material and application |
| CN114101893A (en) * | 2021-10-18 | 2022-03-01 | 上海友升铝业股份有限公司 | Aluminum alloy double-sided friction stir welding process |
| CN113909671A (en) * | 2021-10-27 | 2022-01-11 | 中铝萨帕特种铝材（重庆）有限公司 | Double-sided friction stir welding system |
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Application publication date: 20120725 |