CN102658420A - Friction stir welding process method for ensuring small deformation and high mechanical properties in the assistance of cold control environment - Google Patents
Friction stir welding process method for ensuring small deformation and high mechanical properties in the assistance of cold control environment Download PDFInfo
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- CN102658420A CN102658420A CN201210131973XA CN201210131973A CN102658420A CN 102658420 A CN102658420 A CN 102658420A CN 201210131973X A CN201210131973X A CN 201210131973XA CN 201210131973 A CN201210131973 A CN 201210131973A CN 102658420 A CN102658420 A CN 102658420A
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Abstract
The invention discloses a friction stir welding process method for ensuring small deformation and high mechanical properties in the assistance of a cold control environment, solves the problem that residual deformation is overlarge in the process of connecting a sheet metal structure through friction stir welding, and further improves the mechanical properties of joints. The method comprises the following steps: clamping a weldment A and a weldment B on a worktable in a butted mode; determining a welding direction, clamping a cooling device to an auxiliary fixture, selecting the auxiliary fixture for welding according to a welding process requirement, adjusting the position of the auxiliary fixture, ensuring that a cooling air nozzle and a stirring head are positioned at reasonable opposite positions, and opening a control valve on the cooling device to supply cold air; making a stirring needle of the stirring head pierce a part to be welded; ensuring that the end face of a shaft shoulder and an upper side face of a workpiece are tightly fitted and have curtain down force; and when the stirring head reaches the set piercing depth, moving the stirring head along the horizontal direction of the butted surface of the weldment A and the weldment B until the welding is finished.
Description
Technical field: the present invention relates to a kind of welding technique, the agitating friction welding process method under the control cold environment of especially a kind of small deformation, strong mechanical performance is auxiliary.
Background technology: as a kind of solid phase interconnection technique, do not have the fusing of material and solidification phenomenon to produce in the stir friction welding process, the heat input in the welding process is lower, so friction stir welding member residual stress is lower, the distortion is less relatively.But the welding deformation problem of aluminum alloy thin wall construction friction stir welding still shows very outstandingly, and especially there are big gap in the welding deformation of thin-wall construction and engineering request.For example the thick testpieces bridging arrangement of certain model aircraft cockpit floor 2.0mm adopts the welding of friction stir welding technology, postwelding test specimen undulate, and macroscopic deformation is bigger.Along with deepening continuously and the continuous expansion of practical applications of agitating friction welding technology; The friction stir welding residual deformation reduce with control progressively become the research focus, and developed such as utilize dynamic low stress not have deformation technology, the thermal tension method waits the residual deformation of controlling friction stir welding.Simultaneously, for friction stir welding, the existence of sweating heat makes thickization of crystal grain of the hot machine zone of influence or heat affected area, causes joint the softened zone to occur, has influenced the mechanical property of joint.In recent years, domestic and international research person has begun the rule of strong cold medium influence friction stir welding Temperature Distribution, microstructure and property is studied, but the report that utilizes the control cold environment to improve joint microstructure and control joint residual deformation does not also occur
Summary of the invention: in order to solve the mechanical property that residual deformation that friction stir welding connects the sheet metal structure often can not satisfy the problem of actual engineering demand and further improve joint; The present invention has designed and has been applicable to the agitating friction welding process method of control cold environment under auxiliary, for effective control of thin-slab structure friction stir welding residual deformations such as aluminium alloy, titanium alloy provides a new thinking and method.
For realizing above-mentioned purpose; The technical scheme that the present invention adopts is: the agitating friction welding process method under the control cold environment of a kind of small deformation, strong mechanical performance is auxiliary; Wherein controlling cold environment mainly is to be realized by four auxiliary clamps, and auxiliary clamp is respectively arranged two respectively on welding direction and vertical welding direction; In welding process, on welding direction and choose to cooperate with two auxiliary clamps of arranging perpendicular to welding direction and realize controlling the film-cooled heat of cold environment and the regulation and control of position near the auxiliary clamp of welding direction initiating terminal.The concrete steps of this invention are:
Step 1, weldment A and weldment B butt joint is placed and is positioned on the same horizontal plane (be about to weldment A and weldment B organize to), and with the anchor clamps clamping on workbench; Said weldment A and weldment B are sheet material.
The mixing needle of step 3, stirring-head penetrates position to be welded (being the interface of weldment A and weldment B) with 100～2000 rev/mins rotating speed; It is 1～4mm/ branch that stirring-head penetrates speed, and mixing needle penetrates the little 0～0.3mm of workpiece depth ratio thickness of workpiece, and retainer shaft shoulder end face and workpiece top face fit tightly and certain downforce arranged.
Step 4, when stirring-head reaches the following bundle degree of depth of setting, the speed that stirring-head divides with 50～1600mm/ moves along the interface horizontal direction of weldment A and weldment B, till the welding completion.
The beneficial effect that the present invention is is:
(1) based on the control cold environment, strengthen the cooling velocity of the welded part in the stir friction welding process, reduce the thick degree of the postwelding hot machine zone of influence or heat affected area crystal grain, the scope of dwindling the joint softened zone, the performance of raising joint;
(2) based on the control cold environment; On the weldment of stirring-head back, form shape of a saddle temperature field; Utilize the thermal tension effect to reduce the residual deformation of joint significantly, for effective control of thin-slab structure friction stir welding residual deformations such as aluminium alloy, titanium alloy provides a new thinking and method.
Description of drawings:
Fig. 1 is the friction stir welding welding process sketch map under the control cold environment is assisted.
Fig. 2 is the auxiliary clamp structural representation.
Fig. 3 is a cooling device cold air nozzle arrangements sketch map.
Fig. 4 is a thermal tension effect sketch map.
Among the figure: 1. weldment A, 2. weldment B, 3. friction stir welding equipment head, 4. stirring-head, 5. auxiliary clamp; 6. cooling device, 7. auxiliary clamp operate portions, 8. levelling lever, 9. adjustment screw A; 10. vertical adjusting rod, 11. adjustment screw B, 12. firm bankings, 13. air nozzles; 14. the Flow-rate adjustment block, 15. air cavitys, 16. pin type control valves, 17. cold air inlet.18. cooling device A.
The specific embodiment:
As shown in Figure 1: the four direction at the friction stir welding equipment head 3 of routine has been installed the cooling device 6 of auxiliary clamp 5 and clamping thereof respectively, the relative position that keeps air nozzle 13 and stirring-head 4 to be fit to.In welding process, according to the difference of welding direction, only to open near a cooling device A18 of welding initiating terminal in running orderly, other three all do not have cold air to flow out, and then realize rearmounted cooling.Arrow is depicted as welding direction among the figure.
As shown in Figure 2: auxiliary clamp is fixed on the friction stir welding equipment head 3 through firm banking 12.Levelling lever 8 can be located through adjustment screw A9, and vertically adjusting rod 10 can be located through adjustment screw B11, has satisfied the adjusting of the optional position of air nozzle 13 on welding direction fully.
As shown in Figure 3: refrigerating gas flows into from cold air inlet 17; Enter in the air cavity 15, the hole along Flow-rate adjustment block 14 gets into air nozzle 13 outflows then, and the flow size can be controlled by pin type control valve 16; Wherein air nozzle 13 can be changed; Shape according to different air nozzle 13 outlets changes the interface shape of gas vent, and then reaches its intended purposes.
As shown in Figure 4: the temperature field of welding region distributes and is shape of a saddle distribution, and medium temperature is low, and the both sides temperature is high, and the thermal tension effect is obvious, can play the effect of control postwelding residual deformation; Simultaneously, the cooling velocity in zone is softened in control, can suppress the growth process of crystal grain.
Embodiment
Step 1, weldment A 1 and weldment B 2 butt joints are placed and are positioned on the same horizontal plane (be about to weldment A 1 and weldment B 2 groups to), and with the anchor clamps clamping on workbench; Said weldment A 1 is sheet material with weldment B 2.
The mixing needle of step 3, stirring-head 4 penetrates position to be welded (being the interface of weldment A 1 and weldment B 2) with 800 rev/mins rotating speed; It is the 2mm/ branch that stirring-head 4 penetrates speed, and mixing needle penetrates the little 0.1mm of workpiece depth ratio thickness of workpiece, and retainer shaft shoulder end face and workpiece top face fit tightly and certain downforce arranged.
Step 4, when stirring-head 4 reaches the following bundle degree of depth of setting, stirring-head 4 moves with the interface horizontal direction of weldment B 2 along weldment A 1 with the speed that 800mm/ divides, till welding is accomplished.
Claims (3)
1. the agitating friction welding process method of the control cold environment of a small deformation, strong mechanical performance under auxiliary, its concrete steps are:
Step 1, weldment A and weldment B butt joint is placed and is positioned on the same horizontal plane, and with the anchor clamps clamping on workbench;
Step 2, confirm welding direction; Cooling device is clamped on the auxiliary clamp; Select welding to adjust according to the welding procedure needs with auxiliary clamp and to its position; Guarantee that the nozzle of refrigerating gas and the frontier distance of stirring-head are 3-30mm, open the control valve above the cooling device, beginning cooling gas;
The mixing needle of step 3, stirring-head penetrates position to be welded with 100～2000 rev/mins rotating speed; It is 1～4mm/ branch that stirring-head penetrates speed, and mixing needle penetrates the little 0～0.3mm of workpiece depth ratio thickness of workpiece, and retainer shaft shoulder end face and workpiece top face fit tightly and certain downforce arranged;
Step 4, when stirring-head reaches the following bundle degree of depth of setting, the speed that stirring-head divides with 50～1600mm/ moves along the interface horizontal direction of weldment A and weldment B, till the welding completion.
2. the agitating friction welding process method of the control cold environment of a small deformation, strong mechanical performance under auxiliary; It is characterized in that: the control cold environment mainly is to be realized by four auxiliary clamps, and auxiliary clamp is respectively arranged two respectively on welding direction and vertical welding direction; In welding process, on welding direction and choose to cooperate with two auxiliary clamps of arranging perpendicular to welding direction and realize controlling the film-cooled heat of cold environment and the regulation and control of position near the auxiliary clamp of welding direction initiating terminal.
3. the agitating friction welding process method under the control cold environment of a kind of small deformation as claimed in claim 1, strong mechanical performance is auxiliary, it is characterized in that: said weldment A and weldment B are sheet material.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071917A (en) * | 2013-02-07 | 2013-05-01 | 沈阳航空航天大学 | Ultrasonic-assisted semisolid stirring friction processing process under controlled cooling environment |
| CN103639588A (en) * | 2013-11-11 | 2014-03-19 | 江苏科技大学 | Solid state heat sink device used for friction stir welding and welding method of solid state heat sink device |
| CN106736329A (en) * | 2016-12-08 | 2017-05-31 | 京浜乐梦金属科技（苏州）有限公司 | Industrial cooling copper backboard manufacture method and friction-stir bonding machine |
| CN107309541A (en) * | 2017-07-25 | 2017-11-03 | 江苏科技大学 | Stir cooling device and friction stir welding machine |
| CN107414281A (en) * | 2017-06-05 | 2017-12-01 | 北京世佳博科技发展有限公司 | Reduce the device and welding method of agitating friction welding deformation |
| CN110102872A (en) * | 2019-06-11 | 2019-08-09 | 南京航空航天大学 | A kind of agitating friction weldering Workpiece cooling device |
| CN112935645A (en) * | 2021-04-02 | 2021-06-11 | 广东省科学院中乌焊接研究所 | Cooling system for friction stir welding and use method thereof |
| CN115213543A (en) * | 2022-06-13 | 2022-10-21 | 华南理工大学 | Water spraying type friction stir welding and postweld heat treatment process combination method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101028669A (en) * | 2007-04-24 | 2007-09-05 | 中国航空工业第一集团公司北京航空制造工程研究所 | Thermal-settling agitation fricting welding method and apparatus by array flow-jet impact |
| CN101612690A (en) * | 2009-07-14 | 2009-12-30 | 哈尔滨工业大学 | A kind of Cu-Al dissimilar materials butt joint barrier friction stir welding method |
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2012
- 2012-04-28 CN CN201210131973XA patent/CN102658420A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101028669A (en) * | 2007-04-24 | 2007-09-05 | 中国航空工业第一集团公司北京航空制造工程研究所 | Thermal-settling agitation fricting welding method and apparatus by array flow-jet impact |
| CN101612690A (en) * | 2009-07-14 | 2009-12-30 | 哈尔滨工业大学 | A kind of Cu-Al dissimilar materials butt joint barrier friction stir welding method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071917A (en) * | 2013-02-07 | 2013-05-01 | 沈阳航空航天大学 | Ultrasonic-assisted semisolid stirring friction processing process under controlled cooling environment |
| CN103639588A (en) * | 2013-11-11 | 2014-03-19 | 江苏科技大学 | Solid state heat sink device used for friction stir welding and welding method of solid state heat sink device |
| CN103639588B (en) * | 2013-11-11 | 2015-10-07 | 江苏科技大学 | A kind of solid state heat sink device for friction stir welding and welding method thereof |
| CN106736329A (en) * | 2016-12-08 | 2017-05-31 | 京浜乐梦金属科技（苏州）有限公司 | Industrial cooling copper backboard manufacture method and friction-stir bonding machine |
| CN107414281A (en) * | 2017-06-05 | 2017-12-01 | 北京世佳博科技发展有限公司 | Reduce the device and welding method of agitating friction welding deformation |
| CN107309541A (en) * | 2017-07-25 | 2017-11-03 | 江苏科技大学 | Stir cooling device and friction stir welding machine |
| CN110102872A (en) * | 2019-06-11 | 2019-08-09 | 南京航空航天大学 | A kind of agitating friction weldering Workpiece cooling device |
| CN112935645A (en) * | 2021-04-02 | 2021-06-11 | 广东省科学院中乌焊接研究所 | Cooling system for friction stir welding and use method thereof |
| CN115213543A (en) * | 2022-06-13 | 2022-10-21 | 华南理工大学 | Water spraying type friction stir welding and postweld heat treatment process combination method |
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Application publication date: 20120912 |