CN104959727B - A kind of thin-wall aluminum alloy pipe end composite seal device and welding method - Google Patents

A kind of thin-wall aluminum alloy pipe end composite seal device and welding method Download PDF

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Publication number
CN104959727B
CN104959727B CN201510454270.4A CN201510454270A CN104959727B CN 104959727 B CN104959727 B CN 104959727B CN 201510454270 A CN201510454270 A CN 201510454270A CN 104959727 B CN104959727 B CN 104959727B
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thin
aluminum alloy
wall aluminum
aluminium alloy
alloy pipe
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CN104959727A (en
Inventor
吴铭方
陈书锦
夏晶宇
王鹏浩
薛俊荣
倪瑞洋
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Jushuo Precision Machinery Changshu Co ltd
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Jiangsu University of Science and Technology
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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
    • 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
    • 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
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
    • B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
    • B23K20/2336—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer both layers being aluminium
    • 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
    • B23K20/24—Preliminary treatment
    • 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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/047—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/10—Aluminium or alloys thereof

Abstract

The invention discloses a kind of thin-wall aluminum alloy pipe end composite seal device and welding method, its device includes the turning rolls group for being used to support thin-wall aluminum alloy pipe and aluminium alloy bars, one end of the aluminium alloy bars is fixed by the hollow chuck on rolling clamp, one end of aluminium alloy bars through chuck is provided with top, the aluminium alloy bars other end is inserted into thin-wall aluminum alloy pipe, aluminium alloy bars is interference fit with thin-wall aluminum alloy pipe, top at aluminium alloy bars and thin-wall aluminum alloy pipe cooperation is mixing needle, and mixing needle is fixedly connected with stirring-head.The present invention without using internal swelling device, thin-wall aluminum alloy pipe two ends are not held out against and are fixed, cause thin-wall aluminum alloy tube swelling using being heated to thin-wall aluminum alloy pipe, the aluminium alloy bars that will be less than room temperature is inserted into thin-wall aluminum alloy pipe, the shortcoming that thin-wall pipe rigidity is low, torsional property is poor is overcome, there is versatility in the welding of other materials thin-wall pipe.

Description

A kind of thin-wall aluminum alloy pipe end composite seal device and welding method
Technical field
The present invention relates to a kind of thin-wall aluminum alloy pipe end composite seal device and welding method, belong to metal material processing neck Domain.
Background technology
Agitating friction weldering (Friction Stir Welding, abbreviation FSW) is Britain's institute of welding (The Welding Institute) in the patent welding technique of invention in 1991.Agitating friction weldering is except having the advantages that conventional friction welding technology Outside, the connection of a variety of joint forms and different welding positions can also be carried out.Agitating friction welding technology Aeronautics and Astronautics, Succeeded in terms of ship, train, electric power and heavy weapons application, but currently in terms of the welding of thin-wall aluminum alloy pipe still So there are problems that.
When tube wall becomes it is small when, welding difficulty becomes big.Patent (201410729971.X), which is proposed, uses tungsten inert gas Protection weldering, solves the connectivity problem of small-diameter, thin-walled aluminium alloy pipe；Patent (201010524846.7) proposes a kind of minor diameter The welding method of ozzle and aluminium alloy thin-walled structure, is welded, together to minor-diameter nozzle with aluminium alloy thin-walled structure junction Sample is also to be welded using arc welding method.In fact, being welded (such as ac tungsten inert gases welding) to aluminium using arc welding method When alloy is welded, easily cause crackle and stomata, especially when thin-wall pipe is welded, welding deformation is even more serious, waste product Rate is even up to 70%.In order to improve welding quality, patent (201310096100.4) proposes a kind of heat pump and surpassed with small-bore The production method of thin-walled high-frequency welding aluminium-alloy pipe, but welding current is higher, reaches 230~235A, while the electricity of high-frequency welding Efficiency is low (about 50% or so), and voltage and current is too high, and security is poor.Zheng Ying et al. (patent No.s： 201510118191.6th, 201510118211.X) a kind of production method of aluminium alloy super-large diameter thin wall overpressure resistant pipe is proposed, lead to The method for crossing agitating friction welding carries out longitudinal seam welding.But without reference to the end face sealing technique of aluminium-alloy pipe.Li Hui etc. People (comes from：AWJT2005, October20-23, Dalian, China, A42-A47) propose a kind of thin-wall aluminum alloy cylinder weldering The friction stir welding method of seam, but, it is necessary to ensure that weldment is indeformable using the equipment of internal tensioner, simultaneously in welding process Also need to hold out against end cap from both sides, and the method proposed has a case that opening suitable for aluminium alloy cylindrical body end face, that is, works as end When face requires thorough closing, the method proposed will be unable to complete task.
It can be seen that, when thin-wall aluminum alloy pipe (wall thickness is less than 1mm) needs end face closing welding, it is faced with welding problem, body Now：1st, wall thickness is relatively thin causes rigidity and torsional property poor, it is difficult to direct nip rotation welding；2nd, aluminium alloy end face is closed It is required that, cause internal swelling device to be difficult to be put into inside thin-wall pipe, so as to cause agitating friction weldering due to lacking internal support Connect failure.Therefore propose that a kind of effective thin-wall aluminum alloy sealing method for tube end and device have important practical significance.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of thin-wall aluminum alloy pipe end and answered Sealing device and welding method are closed, without using internal swelling device, thin-wall aluminum alloy pipe two ends is not held out against and is fixed, overcome Thin-wall pipe rigidity is low, torsional property is poor shortcoming.
Technical scheme：In order to solve the above technical problems, a kind of thin-wall aluminum alloy pipe end composite seal device of the present invention, bag The turning rolls group for supporting thin-wall aluminum alloy pipe and aluminium alloy bars is included, one end of the aluminium alloy bars passes through installed in rotating clamp Hollow chuck on tool is fixed, and one end of aluminium alloy bars through chuck is provided with top, the aluminium alloy bars other end insertion Into thin-wall aluminum alloy pipe, aluminium alloy bars is interference fit with thin-wall aluminum alloy pipe, is matched somebody with somebody in aluminium alloy bars with thin-wall aluminum alloy pipe Top at conjunction is provided with mixing needle, and mixing needle is connected with stirring-head.
Preferably, the aluminium alloy bars is provided with several annular seal grooves, close to the annular close of thin-wall aluminum alloy pipe A sealing groove part is located in thin-wall aluminum alloy pipe, and the distance of adjacent annular seal groove is not less than 1.5 times of stirring-head diameter.
Preferably, the annular seal groove longitudinal section is isosceles trapezoid shape, it is isosceles trapezoid away from aluminium alloy bars Upper bottom, upper bottom is twice of bottom, and the base angle of isosceles trapezoid is 45 °.
Preferably, the upper bottom length is：
When 0<d0<During 10mm, H=0.8d0；
As 10≤d0During≤50mm, H=0.6d0；
Work as d0During more than 50mm, H=0.4d0, d0For the diameter of aluminium alloy bars.
Preferably, the magnitude of interference of the aluminium alloy bars and thin-wall aluminum alloy pipe is δ, δ=(t-t0)×α×l-δ0, its In, δ0Temperature when=(1~2) * δ, t is assemblings, t0For the environment temperature before heating, being radially expanded for workpiece is when α is heating Number, l-- is heated the internal diameter in hole.
Preferably, the aluminium alloy bars stretches into 1.5 times of length not less than stirring-head diameter of thin-wall aluminum alloy pipe, stir Mix wall thickness of the length not less than 1.5 times of thin-wall aluminum alloy pipes of pin.
A kind of welding method of above-mentioned thin-wall aluminum alloy pipe end composite seal device, comprises the following steps：
(1) according to actual needs, δ=(t-t is utilized0)×α×l-δ0Magnitude of interference δ is determined, satisfactory aluminium alloy is processed Rod, suitable mixing needle is selected according to thin-wall aluminum alloy thickness of pipe wall；
(2) thin-wall aluminum alloy pipe is heated to 100 DEG C, temperature residing for aluminium alloy bars is less than room temperature, then assembles rapidly thin Wall aluminium-alloy pipe and aluminium alloy bars are simultaneously quickly cooled down, and a half width of the annular seal groove entered in pipe is stretched out aluminium-alloy pipe End；
(3) workpiece assembled is fixed through rolling clamp and with chuck, remainder is then arranged in turning rolls group Operated with rolling clamp；
(4) first start stirring-head, and it is pressed into slowly and preheated by welding zone domain, preheating starts revotating card after terminating Disk, makes workpiece be stopped the rotation after rotating a circle chuck, slowly extracts stirring-head out, can stop after workpiece when mixing needle is completely disengaged from The only rotation of stirring-head；
(5) aluminium alloy bars is cut off along thin-wall aluminum alloy pipe end, fills up fluid sealant in keyhole and annular seal groove, wait it Solidification completely；
(6) other end repeat step (2)~(5) of thin-wall aluminum alloy pipe, then complete answering for thin-wall aluminum alloy pipe end two ends Close sealing.
In the present invention, from dovetail groove, for opposing circular groove, dovetail groove is easy to process；After sealed colloid is inserted, The colloidal volume that the groove of circular shape can be accommodated is smaller, and the contact area with aluminium alloy bars is also smaller, it is easy in outer masterpiece Come off under；The length at upper bottom determines volume, fluid sealant and the aluminium-alloy pipe of fluid sealant, the contact area of aluminium alloy bars, because This must determine certain volume and the seal groove of shape according to the diameter of aluminium alloy bars.Therefore upper bottom is too small, sealed colloid Product is too small, does not play sealing effectiveness；Upper bottom is bigger, and sealing effectiveness can be better；It is too big to cause but upper bottom is not the bigger the better Waste, can also hollow out aluminium alloy bars.
In this patent, thin-wall aluminum alloy pipe using clamping or support meanss, is not only interference fitted with aluminium alloy bars, is protected When demonstrate,proving initial weld, on the one hand, can be brought into close contact between aluminium-alloy pipe and aluminium alloy bars；On the other hand, interference fit is passed through Prevent axially opposing movement between the two；During normal weld, completed weld seam can progressively strengthen aluminium-alloy pipe and aluminium alloy bars Between bonding strength.The selection of the interference fit is compared with the method commonly used in machinery, it is not necessary to which the larger magnitude of interference, this is Because：Inside mixing needle insertion lap weld, mixing needle inherently plays " pinning " effect, it is not necessary to which too strong strength is prevented Both axially opposing movements, Fit is in high temperature (500 DEG C or so), excessive magnitude of interference meeting in welding process in addition Tension very strong on aluminium-alloy pipe is caused, is unfavorable for appearance of weld.And when selecting the magnitude of interference of conventional aluminum alloys material, due to It is softer, it is therefore desirable to have the larger magnitude of interference for aluminium alloy is than steel at a temperature of 100 DEG C.
Beneficial effect：The thin-wall aluminum alloy pipe end composite seal device and welding method of the present invention, with advantages below：
(1) without using internal swelling device, thin-wall aluminum alloy pipe two ends are not held out against and are fixed, closed using to Thin-walled Aluminum Golden pipe, which is heated, causes thin-wall aluminum alloy tube swelling, and the aluminium alloy bars that will be less than room temperature is inserted into thin-wall aluminum alloy pipe, overcome The shortcoming that thin-wall pipe rigidity is low, torsional property is poor, has versatility in the welding of other materials thin-wall pipe.
(2) sealing of pipe end is completed by the way of agitating friction overlap welding and fluid sealant combination, both ensure that welding connect The intensity of head in turn ensure that the air-tightness of aluminium alloy pipe end.
(3) simple in construction, practical, this method and device easily realize and easy to assembly that this is to realizing that Thin-walled Aluminum is closed The application of golden end sealing has important practical significance.
Brief description of the drawings
Fig. 1 is that thin-wall aluminum alloy pipe end is combined soldering and sealing device overall schematic；
Fig. 2 is welding point front view and its each part direction of rotation；
Fig. 3 is welding point cross-sectional view；
Fig. 4 amplifies 2 times of schematic diagrames for the aluminium alloy bars section with annular seal groove.
Embodiment
As shown in Figures 1 to 4, a kind of thin-wall aluminum alloy pipe end composite seal device of the invention, including thin for supporting The turning rolls group 10 of wall aluminium-alloy pipe 1 and aluminium alloy bars 6, one end of the aluminium alloy bars 6 passes through on rolling clamp 8 Hollow chuck 7 is fixed, and one end of aluminium alloy bars 6 through chuck 7 is provided with top 9, and the other end of aluminium alloy bars 6 is inserted into In thin-wall aluminum alloy pipe 1, aluminium alloy bars 6 is interference fit with thin-wall aluminum alloy pipe 1, in aluminium alloy bars 6 and thin-wall aluminum alloy pipe 1 Top at cooperation is provided with mixing needle 2, and mixing needle 2 is connected with stirring-head 3.
In the present invention, the aluminium alloy bars 6 is provided with five annular seal grooves 5, close to the annular of thin-wall aluminum alloy pipe 1 The half of seal groove 5 is located in thin-wall aluminum alloy pipe 1, and the distance of adjacent annular seal groove 5 is 1.5 times of the diameter of stirring-head 3, described The longitudinal section of annular seal groove 5 is isosceles trapezoid shape, the upper bottom for isosceles trapezoid away from the central shaft of aluminium alloy bars 6, under upper bottom is Twice of bottom, the base angle of isosceles trapezoid is 45 °.
In the present invention, the upper bottom length is：When 0<d0<During 10mm, H=0.8d0；As 10≤d0During≤50mm, H= 0.6d0；Work as d0During more than 50mm, H=0.4d0, d0For the diameter of aluminium alloy bars 6.
In the present invention, the magnitude of interference of the aluminium alloy bars 6 and thin-wall aluminum alloy pipe 1 is δ, δ=(t-t0)×α×l-δ0, Wherein, δ0Temperature when=(1~2) * δ, t is assemblings, t0For the environment temperature before heating, workpiece is radially expanded when α is heating Coefficient, l is heated the internal diameter in hole.The length that the aluminium alloy bars 6 stretches into thin-wall aluminum alloy pipe 1 is the 1.5 of the diameter of stirring-head 3 Times, the length of mixing needle 2 is the wall thickness of 1.5 times of thin-wall aluminum alloy pipes 1.
Mixing needle 2 on stirring-head 3 rigidly fixes connection, spinning movement, X-axis, Y-axis, the Z axis adjustment of stirring-head 3 Function can be realized using friction stir welding machine on the market.The X-axis is the lengthwise movement of stirring-head 3, realizes the quick of weld seam 4 Positioning, is driven using " servomotor+ball-screw+straight ball-guide "；The Y-axis is the transverse movement of stirring-head 3, and realization is stirred The first 3, adjustment of lateral attitude and handling stirring-head 3 are mixed, is driven using " manual trapezoidal screw+straight ball-guide "；The Z axis Moved vertically for main tapping, realize the insertion of stirring-head 3, be driven using " servomotor+worm reducer+ball-screw "；Institute Weld jig rotary shaft is stated, the rotation of aluminium alloy bars and aluminium-alloy pipe 1 is realized, using " servomotor+planet-cycloid reducer " Driving；The rotary shaft of the stirring-head 3, can be directly driven by a motor.
In the present invention, pneumatic finial 9 is mainly used to promote the feeding of aluminium alloy bars 6, so selection piston type pneumatic top The motive force of point 9 and the pneumatic finial 9 selected can be smaller.The turning rolls group 10, can be between Y-direction regulation roller Distance, to adapt to the pipe fitting of different-diameter.
In the present invention, the direction of rotation of stirring-head 3 and chuck 7 is determined：As illustrated in fig. 2, it is assumed that from the angle of left view Observe the direction of rotation of chuck 7, at the same from the angle of top view from stirring-head 3 direction of rotation, if the counter clockwise direction of chuck 7 Rotation, then stirring-head 3 must be rotated clockwise；If conversely, chuck 7 is rotated clockwise from the angle of left view, Then stirring-head 3 must be rotated clockwise from the angle of top view.
A kind of welding method of above-mentioned thin-wall aluminum alloy pipe end composite seal device, comprises the following steps：
(1) according to actual needs, δ=(t-t is utilized0)×α×l-δ0Magnitude of interference δ is determined, satisfactory aluminium alloy is processed Rod 6, suitable mixing needle 2 is selected according to the wall thickness of thin-wall aluminum alloy pipe 1；
(2) thin-wall aluminum alloy pipe 1 is heated to 100 DEG C, temperature residing for aluminium alloy bars 6 is less than room temperature, then rapid assembling Thin-wall aluminum alloy pipe 1 and aluminium alloy bars 6 are simultaneously quickly cooled down, and a half width of the annular seal groove 5 entered in pipe is stretched out aluminium and are closed The golden end of pipe 1；
(3) workpiece assembled is fixed through rolling clamp 8 and with chuck 7, remainder is then arranged on turning rolls group Operated on 10 with rolling clamp 8；
(4) first start stirring-head 3, and it is pressed into slowly and preheated by welding zone domain, preheating starts rotation after terminating Chuck 7, makes workpiece be stopped the rotation after rotating a circle chuck 7, slow to extract stirring-head 3 out, after mixing needle 2 completely disengages from workpiece The rotation of stirring-head 3 can be stopped；
(5) along the tip cut-off aluminium alloy bars of thin-wall aluminum alloy pipe 1, fluid sealant is filled up in keyhole and annular seal groove 5, is waited It solidifies completely；
(6) other end repeat step (2)~(5) of thin-wall aluminum alloy pipe 1, then complete the end two ends of thin-wall aluminum alloy pipe 1 Compound seal.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (5)

1. a kind of thin-wall aluminum alloy pipe end composite seal device, it is characterised in that：Including for supporting thin-wall aluminum alloy pipe and aluminium The turning rolls group of alloy bar, one end of the aluminium alloy bars is fixed by the hollow chuck on rolling clamp, and aluminium is closed It is top that golden rod passes through one end of chuck to be provided with, and the aluminium alloy bars other end is inserted into thin-wall aluminum alloy pipe, aluminium alloy bars It is interference fit with thin-wall aluminum alloy pipe, the top at aluminium alloy bars and thin-wall aluminum alloy pipe cooperation is provided with mixing needle, stirred Pin is mixed to be connected with stirring-head；The aluminium alloy bars is provided with several annular seal grooves, close to the annular close of thin-wall aluminum alloy pipe A sealing groove part is located in thin-wall aluminum alloy pipe, and the distance of adjacent annular seal groove is not less than 1.5 times of stirring-head diameter；It is described The magnitude of interference of aluminium alloy bars and thin-wall aluminum alloy pipe is δ, δ=(t-t0)×α×l-δ0, wherein, δ0=(1~2) * δ, t are assembling When temperature, t0For the environment temperature before heating, workpiece is radially expanded coefficient when α is heating, and l is the internal diameter for being heated hole.
2. thin-wall aluminum alloy pipe end composite seal device according to claim 1, it is characterised in that：The annular seal groove Longitudinal section is isosceles trapezoid shape, the upper bottom for isosceles trapezoid away from aluminium alloy bars, and upper bottom is twice of bottom, isosceles trapezoid Base angle is 45 °.
3. thin-wall aluminum alloy pipe end composite seal device according to claim 2, it is characterised in that：The upper bottom length For：
When 0<d0<During 10mm, H=0.8d0；
As 10≤d0During≤50mm, H=0.6d0；
Work as d0During more than 50mm, H=0.4d0, d0For the diameter of aluminium alloy bars.
4. thin-wall aluminum alloy pipe end composite seal device according to claim 3, it is characterised in that：The aluminium alloy bars is stretched The length for entering thin-wall aluminum alloy pipe is not less than 1.5 times of stirring-head diameter, not less than 1.5 times thin-wall aluminum alloys of length of mixing needle The wall thickness of pipe.
5. a kind of welding method of thin-wall aluminum alloy pipe end composite seal device as claimed in claim 4, it is characterised in that bag Include following steps：
(1) according to actual needs, δ=(t-t is utilized0)×α×l-δ0Magnitude of interference δ is determined, satisfactory aluminium alloy bars is processed, Suitable mixing needle is selected according to thin-wall aluminum alloy thickness of pipe wall；
(2) thin-wall aluminum alloy pipe is heated to 100 DEG C, temperature residing for aluminium alloy bars is less than room temperature, then rapid assembling Thin-walled Aluminum Compo pipe and aluminium alloy bars are simultaneously quickly cooled down, and a half width of the annular seal groove entered in pipe is stretched out aluminium alloy pipe end；
(3) workpiece assembled is fixed through rolling clamp and with chuck, remainder is then arranged in turning rolls group with rotation Turn fixture operating；
(4) first start stirring-head, and it is pressed into slowly and preheated by welding zone domain, preheating starts rotary chuck after terminating, Workpiece is stopped the rotation after rotating a circle chuck, slowly extract stirring-head out, can stop after workpiece when mixing needle is completely disengaged from The rotation of stirring-head；
(5) aluminium alloy bars is cut off along thin-wall aluminum alloy pipe end, fills up fluid sealant in keyhole and annular seal groove, wait its complete Solidification；
(6) other end repeat step (2)~(5) of thin-wall aluminum alloy pipe, then complete the compound close of thin-wall aluminum alloy pipe end two ends Envelope.
CN201510454270.4A 2015-07-29 2015-07-29 A kind of thin-wall aluminum alloy pipe end composite seal device and welding method Active CN104959727B (en)

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