CN107470767A - The docking circumferential weld friction stir welding method of the weak rigid hollow post component of large scale - Google Patents
The docking circumferential weld friction stir welding method of the weak rigid hollow post component of large scale Download PDFInfo
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- CN107470767A CN107470767A CN201710618523.6A CN201710618523A CN107470767A CN 107470767 A CN107470767 A CN 107470767A CN 201710618523 A CN201710618523 A CN 201710618523A CN 107470767 A CN107470767 A CN 107470767A
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- welded
- tubular column
- open tubular
- friction stir
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Classifications
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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
- B23K20/002—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating specially adapted for particular articles or work
-
- 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
Abstract
The present invention provides a kind of docking circumferential weld friction stir welding method of the weak rigid hollow post component of large scale, belongs to agitating friction welding technique field.The friction stir welding method of open tubular column component provided in an embodiment of the present invention, pass through external compression mechanism banding welded unit, the circularity of connection member to be welded and the levelness of axis are constrained by the rigid hollow face in external compression mechanism, ensure that the circularity of connection member to be welded is consistent with the circularity in rigid hollow face by interior hold-down mechanism, so that the assembling roundness control of connection member to be welded is within 0.5mm, in addition the axis of connection member to be welded is consistent with external compression mechanism, improves the fit-up gap of two sections of connection members to be welded and the precision of unfitness of butt joint.
Description
Technical field
The present invention relates to a kind of welding method of open tubular column component, belong to agitating friction welding technique field.
Background technology
Agitating friction welding technology is a new Solid-phase welding skill of beginning of the nineties in last century Britain's institute of welding invention
Art, because it has the characteristics that joint quality is high, weld defect is few, welding deformation is small, welding process green non-pollution, therefore it is non-
It is very suitable for the welding of Aerospace Aluminum tank.
Application history of the technology on China's carrier rocket tank be from cylinder section to bottom, until tank general assembly circumferential weld,
Structure and technically follow from Yi Ernan, iterative method.Due to the parts small volume of cylinder section and bottom, simple in construction, dress
It is easily guaranteed that with precision, therefore China has been realized in agitating friction welding technology answering on cylinder section longitudinal joint and bottom main weld
With, and successfully passed flight test examination.
Because tank diameter is generally between 3.35-5m, and wall thickness is only 6-10mm or so, and radius-thickness ratio is distributed in 335-
Between 833, there is the characteristics of large scale is weak rigid, it is difficult to ensure that the essence such as two sections of assembling circularity to be welded, gap, unfitness of butt joint
Degree requires.
The content of the invention
It is an object of the invention to provide a kind of docking circumferential weld agitating friction weldering of the weak rigid hollow post component of large scale to connect
Method, requirement of the agitating friction weldering to assembly precision can not be met to solve the weak rigid hollow post component of large scale in the prior art
The problem of.
The present invention is achieved by the following technical solutions：
The docking circumferential weld friction stir welding method of the weak rigid hollow post component of large scale, comprises the following steps：
Step (1), open tubular column component to be welded is fixed by external compression mechanism, make the outer of the open tubular column component to be welded
Surface and the rigid hollow face of the external compression mechanism are affixed, and axis is consistent with the axis in the rigid hollow face, institute
The shape for stating rigid hollow face matches with the standard external surface shape of the open tubular column component；
Step (2), the inner surface of the open tubular column component to be welded is compressed by interior hold-down mechanism, so that described to be welded
The outer surface of component is bonded with the rigid hollow face of the external compression mechanism；
Step (3), it is directed at the end face of two open tubular column components to be welded, open tubular column component to be welded described to two
It is stirred friction welding.
In an alternative embodiment, also include before step (3)：
Milling is carried out to the end face of the open tubular column component to be welded, makes end face smooth.
In an alternative embodiment, also include before step (3)：
The inner surface for compressing the butted line position of two open tubular column components to be welded by welding hold-down mechanism.
In an alternative embodiment, step (3) includes：
Mixing needle is inserted to the seam crossing of two open tubular column components to be welded, keeps the mixing needle length constant,
Welded along the seam crossing；
After the full whole circle of welding, continue to weld preset length；
Then, continue welding on one side shorten the intubating length of the mixing needle, up to the mixing needle exit it is to be welded
Connection member.
In an alternative embodiment, the seam crossing that mixing needle is inserted to two open tubular column components to be welded, bag
Include：
Mixing needle is inserted to nine o'clock or the three position of the seam crossing of two open tubular column components to be welded.
It is described to be welded along the seam crossing in an alternative embodiment, including：
Two open tubular column component synchronous axial systems are driven by the external compression mechanism, the mixing needle is connect described in
Welded at seam.
In an alternative embodiment, the mixing needle is provided with fixing axle, and the fixing axle is hollow-core construction, the mixing needle
It is located in the cavity of the fixing axle, the length that the cavity is leant out by adjusting the mixing needle changes the mixing needle
Intubating length.
In an alternative embodiment, the interior hold-down mechanism is worn on center shaft, and two institutes are directed at described in step (3)
The end face of open tubular column component to be welded is stated, including：
The interior hold-down mechanism is slided along the central shaft axial direction, makes the external compression mechanism and open tubular column to be welded
Component is with the interior hold-down mechanism synchronizing moving, until two open tubular column member end face docking to be welded.
In an alternative embodiment, the open tubular column component is hollow cylinder component, internal diameter 3-5mm, wall thickness 6-
10mm。
In an alternative embodiment, also include before step (1)：
Interior hold-down mechanism assembly line is marked in the inner surface of open tubular column component to be welded, in the appearance of the connection member to be welded
Mark external compression mechanism assembly line in face.
The present invention has the advantages that：
(1) the docking circumferential weld agitating friction weldering side of connecing of the weak rigid hollow post component of large scale provided in an embodiment of the present invention
Method, by the way that connection member to be welded is fixed in external compression mechanism, structure to be welded is constrained by the rigid hollow face in external compression mechanism
The circularity of part and the levelness of axis, ensure the circularity and the circularity in rigid hollow face of connection member to be welded by interior hold-down mechanism
Unanimously, so that the assembling roundness control of connection member to be welded is within 0.5mm, the axis of connection member to be welded and external compression in addition
Mechanism is consistent, improves the fit-up gap of two sections of connection members to be welded and the precision of unfitness of butt joint；
(2) by milling end face, fit-up gap, unfitness of butt joint control is made to further increase assembling essence within 0.2mm
Degree；
(3) inner surface of connection member butted line position to be welded is compressed by welding hold-down mechanism, thinks structure to be welded
Part provides rigid solder support, component is controlled with welding the compactness of hold-down mechanism within 0.3mm, avoids mixing needle upset
Power treats the influence of welded unit circularity, further increases welding precision；
(4) mixing needle is progressively exited by side welding edge before the end, avoids and mixing needle is directly exited after having welded lead
The problem of keyhole being left on the weld seam of cause；
(5) by being welded since three or nine o'clock position, while welding precision is ensured, subtract to greatest extent
Small welding machine supporting member h height and complexity, so as to reduce the cost of manufacture of welding machine supporting member；
(6) friction stir welding method provided in an embodiment of the present invention is successfully realized China's carrier rocket tank general assembly ring
The agitating friction welding of seam, greatly improved uniformity, the reliability and stability of tank circular seam joint quality, and its joint
Mechanical property improves about 20-30%.
(7) it is a kind of process of green non-pollution without arc light, smoke dust, without splashing during girth welding.
Brief description of the drawings
Fig. 1 is connection member to be welded provided in an embodiment of the present invention and external compression mechanism, interior hold-down mechanism and welding compacting machine
The structural representation of structure first state；
Fig. 2 is connection member to be welded provided in an embodiment of the present invention and external compression mechanism, interior hold-down mechanism and welding compacting machine
The structural representation of the state of structure second；
Fig. 3 is connection member to be welded provided in an embodiment of the present invention and external compression mechanism, interior hold-down mechanism and welding compacting machine
The structural representation of the structure third state；
Fig. 4 is connection member to be welded provided in an embodiment of the present invention and external compression mechanism, interior hold-down mechanism and welding compacting machine
The structural representation of the state of structure the 4th；
Fig. 5 is connection member to be welded provided in an embodiment of the present invention and external compression mechanism, interior hold-down mechanism and welding compacting machine
The structural representation of the state of structure the 5th；
Fig. 6 a are circular winding face structural representation provided in an embodiment of the present invention；
Fig. 6 b are square winding face structural representation provided in an embodiment of the present invention；
Fig. 7 is stirring-head pumpback process schematic provided in an embodiment of the present invention；
Fig. 8 is a kind of weld start position schematic diagram provided in an embodiment of the present invention；
Fig. 9 is a kind of interior compression mechanism structure schematic diagram provided in an embodiment of the present invention；
Figure 10 is a kind of central circular structural representation provided in an embodiment of the present invention；
Figure 11 is a kind of welding hold-down mechanism structural representation provided in an embodiment of the present invention；
Figure 12 is welding hold-down mechanism provided in an embodiment of the present invention and interior compression mechanism position relation schematic diagram；
Figure 13 is Rocket tank general assembly structural representation provided in an embodiment of the present invention；
Figure 14 is plumb joint weld start position view provided in an embodiment of the present invention；
Figure 15 is stirring-head structural representation provided in an embodiment of the present invention；
Figure 16 is Fundamentals of Welding schematic diagram provided in an embodiment of the present invention；
Figure 17 is unloading process schematic diagram after the completion of welding provided in an embodiment of the present invention；
Figure 18 is follow-up assemble welding schematic diagram provided in an embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Referring to Fig. 1-5, the embodiments of the invention provide a kind of stirring of the docking circumferential weld of the weak rigid hollow post component of large scale
Friction welding method, comprise the following steps：
Step (1), the first open tubular column component 2 is fixed by the first external compression mechanism 1, make the outer of the first open tubular column component 2
Surface and the rigid hollow face of the first external compression mechanism 1 are affixed, and axis is consistent with the axis in the rigid hollow face, institute
The shape for stating rigid hollow face matches with the standard external surface shape of the open tubular column component, solid by the second external compression mechanism 3
Fixed second open tubular column component 4, the outer surface and the rigid hollow face of the second external compression mechanism 3 for making the second open tubular column component 4 are affixed；
Step (2), the inner surface of the first open tubular column component 2 is compressed by hold-down mechanism 5 in first, so that the first open tubular column
The outer surface of component 2 is bonded with the rigid hollow face of the first external compression mechanism 1, and it is empty to compress second by hold-down mechanism 6 in second
The inner surface of stem component 4, so that the outer surface of the second open tubular column component 4 and the rigid hollow face of the second external compression mechanism 3 are pasted
Close；
Step (3), the end face of the first open tubular column component 2 and the second open tubular column component 4 is directed at, to the first open tubular column component 2
Friction welding is stirred with the second open tubular column component 4.
In the embodiment of the present invention, open tubular column component can include hollow cylinder, hollow ellipse post even hollow square column, sky
The components such as heart polygon post, the present invention do not limit；Correspondingly, referring to Fig. 6 a and 6b, the shape of the macaroni can be circle
Shape winding face a, oval winding face, square winding face b and polygon winding face etc., and sectional dimension and open tubular column component appearance
The sectional dimension in face is consistent；
Specifically, in the alternative embodiment of the present invention, open tubular column component is hollow cylinder component, and internal diameter is 3-
5mm, wall thickness 6-10mm, material are aluminium alloy, and external compression mechanism includes base and compressed part, is respectively provided with base and compressed part
One semi-circular arc face, base and compressed part fasten latter two semi-circular arc and face to be connected into the circular winding face of a standard, external compression
The preferred steel material of mechanism, and the length of rigid hollow face vertically is the 1/25-1/20 of hollow cylinder component axial length, with
Ensure that the axis of hollow cylinder component is consistent with the axis in rigid hollow face；Base and compressed part can set supporting peace
Hole is filled, is fixedly connected, can also be connected by setting clamping joint and buckling groove by way of clamping by threaded fastener,
The present invention does not limit；The external diameter of interior hold-down mechanism can be equal to the internal diameter of hollow cylinder, and the external diameter of preferably interior hold-down mechanism can
Adjust, maximum outside diameter is equal to the internal diameter of hollow cylinder.
The friction stir welding method of open tubular column component provided in an embodiment of the present invention, by the way that connection member to be welded is fixed on
In external compression mechanism, the circularity of connection member to be welded and the levelness of axis are constrained by the rigid hollow face in external compression mechanism,
Ensure that the circularity of connection member to be welded is consistent with the circularity in rigid hollow face by interior hold-down mechanism, so that the dress of connection member to be welded
With roundness control within 0.5mm, the axis of connection member to be welded is consistent with external compression mechanism in addition, improve two sections it is to be welded
The fit-up gap of component and the precision of unfitness of butt joint.
Further, further to improve the precision of fit-up gap, in an alternative embodiment, also wrapped before step (3)
Include：
Milling is carried out to the end face of the first open tubular column component 2 and the second open tubular column component 4, makes end face smooth.Pass through milling
End face, fit-up gap, unfitness of butt joint control is set to further increase assembly precision within 0.2mm；
Further, also include before step (3)：
The butted line position of the first open tubular column component 2 and the second open tubular column component 4 is compressed by welding hold-down mechanism 7
Inner surface, with for connection member to be welded provide rigid solder support, make component with weld hold-down mechanism compactness control exist
Within 0.3mm, avoid mixing needle upset force from treating the influence of welded unit circularity, further increase welding precision.
Referring to Fig. 7, in an alternative embodiment, step (3) includes：
Mixing needle 8 is inserted at the seam o of the first open tubular column component 2 and the second open tubular column component 4, be kept stirring for pin 8 and grow
Spend constant, welded along the seam crossing；
After the full whole circle of welding, continue to weld preset length；In the embodiment of the present invention, the preferred 15-20 ° of correspondence of preset length
Arc length；
Then, welding is continued while shortening the intubating length of mixing needle 8, until mixing needle 8 exits connection member to be welded.
The welding method avoids welded after directly exit mixing needle caused by the problem of leaving keyhole on weld seam, ensure
The structural intergrity of product.
In the embodiment of the present invention, mixing needle is inserted to the seam o's of the first open tubular column component 2 and the second open tubular column component 4
Nine o'clock or three position.Referring to Fig. 8, by being welded since three or nine o'clock position, ensureing welding precision
Meanwhile welding machine supporting member h height and complexity are reduced to greatest extent, so as to reduce the making of welding machine supporting member
Cost.
Referring to Fig. 9 and 10, interior hold-down mechanism is located on central shaft 9, and in an alternative embodiment, interior hold-down mechanism includes
Polylith arc block, polylith arc block is supported and fixed in a central circular 10 by retractable support lever, and it is similar to piece together one
The structure of annular disk, central circular 10 are provided with adjustable gap 11, in yoke configurations, when supporting open tubular column component from inside,
The screw being located in by tightening on gap 11 tenses gap 11, hold-down mechanism in whole is fixed on central shaft 9, works as needs
During the end face of two open tubular column components to be welded of alignment, slightly loose open and clear mouth 11 makes axial direction of the interior hold-down mechanism along central shaft 9
Direction is moved, so as to drive external compression mechanism and welding open tubular column component synchronizing moving, until two described to be welded hollow
Dock in post member end face.
Specifically, also it is located on central shaft 9 referring to Figure 11, welding hold-down mechanism 7, the welding hold-down mechanism and internal pressure
Tight mechanism structure is similar, including polylith arc block, polylith arc block are supported and fixed on a central circular by retractable support lever
On 10, and a structure similar to annular disk is pieced together, central circular 10 is provided with adjustable gap 11, in yoke configurations, when being not required to
Will use welding hold-down mechanism 7 when, the length by shortening retractable support lever withdraw arc block when need to use welding compress
During mechanism, the length by extending retractable support lever makes the diameter of welding hold-down mechanism 7 be in maximum, now welds compacting machine
The position relationship of hold-down mechanism 1 is as shown in figure 12 in structure 7 and first.Now hold-down mechanism 1 melts with welding hold-down mechanism 7 in first
It is integrated, is advantageous to keep integral rigidity, and the compactness of product and welding hold-down mechanism 7.
In the embodiment of the present invention, mixing needle 8 is provided with fixing axle 15, and fixing axle 15 is hollow-core construction, and mixing needle 8 is located in solid
In the cavity of dead axle 15, the length that the cavity is leant out by adjusting mixing needle 8 changes the intubating length of mixing needle 8.
It is below a specific embodiment for the present invention：
The embodiments of the invention provide a kind of friction stir welding method of Rocket tank general assembly, as shown in figure 13, rocket
Tank general assembly includes multiple sections 14 between posterior basal segment 12, preceding bottom section 13 and preceding bottom section 13 and posterior basal segment 12, the material of cylinder section 14
Matter is aluminium alloy；To carry out 2 tank cylinder sections 14 (i.e. the first open tubular column component 2 and the second open tubular column components under horizontal state
4) exemplified by friction rabbling welding, friction stir welding method is described as follows：
The outer radius R1 of first open tubular column component 2 and the second open tubular column component 4, inside radius R2 and axial length d all sames,
Outer radius is R1, inside radius R2, and external compression mechanism is made up of base and compressed part, and base and compressed part are formed after fastening
Core structure, the section of hollow parts is standard round, a diameter of R3 (i.e. a diameter of R3 of macaroni), R3=R1, due to external compression machine
Structure is steel material, and macaroni is rigidity, and the circularity of standard round can ensure within 0.1, have preferable positioning precision and
Repetitive positioning accuracy, the axial length of macaroni are the 1/25 of hollow cylinder component axial length；Wherein, R1 1677mm, R2
For 1669mm；
Interior hold-down mechanism is located on central shaft 9, and interior hold-down mechanism includes 12 pieces of arc blocks, has six in 12 pieces of arc blocks
Block is formpiston block, and six pieces are cavity block, and formpiston block and cavity block are arranged alternately, by control formpiston block and cavity block stretching or
Retract and realize the regulation of internal hold-down mechanism diameter, as shown in Figure 10, during interior compression module pressing connection member to be welded, 12 pieces of arcs
Shape block retractable support lever is supported and fixed in a central circular 10, and pieces together a structure similar to annular disk, during rollback, six
Block cavity block first retracts, and is retracted after six pieces of formpiston blocks, and during compression, six pieces of formpiston block elder generation stretchings, six pieces because of stretching after module；Center
Annulus 10 is provided with adjustable gap 11, and in yoke configurations, when supporting open tubular column component from inside, gap is located in by tightening
Screw on 11 tenses gap 11, hold-down mechanism in whole is fixed on central shaft 9, and when needing, alignment two is described to be welded
During the end face of open tubular column component, slightly loose open and clear mouth 11 moves axial direction of the interior hold-down mechanism along central shaft 9, outer so as to drive
Hold-down mechanism and welding open tubular column component synchronizing moving, until two open tubular column member end face docking to be welded；Internal pressure
Tight mechanism, its stretching state outer radius are R4=R2；
External compression machine is marked in the outer mold surface of the first open tubular column component 2 and one end to be welded of the second open tubular column component 4
Structure rigging position line (from the length of contact surface to be welded starting vertically) B1=23mm (including milling surplus 3mm)；It is empty first
Interior hold-down mechanism rigging position line B2=33mm (including millings are marked on the inner mold face of the open tubular column component 4 of stem component 2 and second
Surplus 3mm)；
Fig. 1 is original state, and the first external compression mechanism 1 is moved to the B1=of the outer surface of the first open tubular column component 2
Near 23mm rigging position lines, fasten and form 1 standard round, be closely affixed with the outer mold surface of the first open tubular column component 2, adjustment the
The position of one open tubular column component 2 and the first external compression mechanism 1, the position for making hold-down mechanism 5 in first be located at rigging position line B2
Place, make the first open tubular column component 2 that radial motion, and appearance will not occur from the internal inner surface for compressing the first open tubular column component 2
Face and the inner surface of the first external compression mechanism 1 are brought into close contact, axis and the macaroni axis one of the first external compression mechanism 1
Cause.The state after above-mentioned action is completed as shown in Fig. 2 carrying out the milling of the surplus of the first open tubular column component 2 afterwards, makes its to be welded
Contact surface is smooth.
According to above-mentioned steps identical method by the second open tubular column component 4 and the second external compression mechanism 3 and the second internal pressure
Tight mechanism 6 assembles, and carries out the milling of contact surface to be welded, as shown in Figure 3；
It is slightly loose to drive hold-down mechanism 5 in first and weld slitting for hold-down mechanism 7 after two hollow units to be welded assemble
Mouthful, hold-down mechanism 5 and welding hold-down mechanism 7 in first is slided along central shaft, make the first open tubular column component 2 and the second open tubular column
The alignment fitting of 4 contact surface to be welded of component；Pairing gap is checked, is allowed to be maintained within 0.5mm, as shown in Figure 4；Afterwards, strut
Hold-down mechanism 7 is welded, as shown in Figure 5；
Because external compression mechanism inner mold face is identical with the type face of cylinder section product external surfaces and diameter, and external compression mechanism snaps
Rigidity afterwards is very strong, therefore cylinder section product can be bound round into circle well.And interior support mechanism is when compressing, it is thus only necessary to which cylinder section is tight
Thickly it is pressed on the inner mold face of external compression mechanism.Because the axiality of left and right external compression mechanism can ensure in 0.1mm
Within, thus outer positioning assembly method can ensure well the gap of the horizontal assembling of tank general assembly circumferential weld, misalignment, circularity and
The compactness of product and back backing plate.
During welding, Fig. 8 and 14 is participated in, welding main frame is fixed on the 9 of the first open tubular column component 2 and the second open tubular column component 4
O'clock direction, host header upwarps 2.5-3 °, and the first open tubular column component 2 revolves counterclockwise with the second open tubular column component 4 in welding process
Turn (to drive based on the first external compression mechanism 1 and the second external compression mechanism 3, the first open tubular column component 2 and the second open tubular column component 4
It is servo-actuated), as shown in figure 15, the stirring-head of the embodiment of the present invention includes mixing needle 8 and fixing axle 15, and fixing axle 15 is that variable diameters are empty
Core structure, mixing needle 8 are variable diameters acicular texture, be located in fixing axle 15 it is hollow in, and the less one end of external diameter is from fixation
Less one end of internal diameter of axle 15 passes, and for agitating friction, mixing needle 8 and relative position of the fixing axle 15 in axial direction are adjustable.
Referring to Figure 16, rotate counterclockwise connection member to be welded, is welded since A points, and component thickness to be welded is 8mm, and mixing needle 8 is stretched
It is about 7.8mm to go out length, and 360 ° of rotate counterclockwise is soldered to since A points and is completed in a whole lap welding termination process, the length of mixing needle 8
Be always 7.8mm, when mixing needle 8 through starting welding position A points when, continue to weld, and between A-B mixing needle 8 length
It is still 7.8mm, the circular arc between A-B is 15 °；Afterwards, referring to Figure 16 and Fig. 7, since B points, mixing needle 8 is progressively withdrawn,
The pumpback speed υ w of mixing needle 8 are controlled in 4.68-28mm/min, are gradually retracted to mixing needle 8 in the cavity of fixing axle 15, i.e.,
Mixing needle ability length is gradually shortened, while weld penetration also gradually decreases；When the end face of mixing needle 8 and the end face of fixing axle 15 are positioned at same
During one plane (C points), welding terminates, and forms complete closing circumferential weld, while weld main frame and withdraw weld seam.
After the completion of welding, first hold-down mechanism in rollback, then open external compression mechanism, two structures welded together of dropping back afterwards
Part, as shown in figure 17.
3rd cylinder section 14 is installed in the first external compression mechanism 1 again afterwards, starts the welding of follow-up circumferential weld, such as Figure 18 institutes
Show.
Friction stir welding method provided in an embodiment of the present invention is successfully realized China's carrier rocket tank general assembly circumferential weld
Agitating friction welding, uniformity, the reliability and stability of tank circular seam joint quality, and its joint power greatly improved
Learn performance and improve about 20-30%, and, it is a kind of green non-pollution without arc light, smoke dust, without splashing during girth welding
Process.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.Described specific embodiment is only pair
Spirit explanation for example of the invention.The personnel of the technical field of the invention can do different repair to described specific embodiment
Change or supplement or replaced using similar mode, but spirit without departing from the present invention or surmount appended claims and defined
Scope.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (10)
- A kind of 1. docking circumferential weld friction stir welding method of the weak rigid hollow post component of large scale, it is characterised in that including with Lower step：Step (1), open tubular column component to be welded is fixed by external compression mechanism, makes the outer surface of the open tubular column component to be welded It is affixed with the rigid hollow face of the external compression mechanism, and axis is consistent with the axis in the rigid hollow face, it is described firm The shape of property macaroni matches with the standard external surface shape of the open tubular column component；Step (2), the inner surface of the open tubular column component to be welded is compressed by interior hold-down mechanism, so that the connection member to be welded Outer surface be bonded with the rigid hollow face of the external compression mechanism；Step (3), is directed at the end face of two open tubular column components to be welded, and open tubular column component to be welded described to two is carried out Agitating friction welds.
- 2. friction stir welding method according to claim 1, it is characterised in that also include before step (3)：Milling is carried out to the end face of the open tubular column component to be welded, makes end face smooth.
- 3. friction stir welding method according to claim 1, it is characterised in that also include before step (3)：The inner surface for compressing the butted line position of two open tubular column components to be welded by welding hold-down mechanism.
- 4. friction stir welding method according to claim 1, it is characterised in that step (3) includes：Mixing needle is inserted to the seam crossing of two open tubular column components to be welded, keeps the mixing needle length constant, along institute Seam crossing is stated to be welded；After the full whole circle of welding, continue to weld preset length；Then, welding is continued while shortening the intubating length of the mixing needle, until the mixing needle exits structure to be welded Part.
- 5. friction stir welding method according to claim 4, it is characterised in that described to insert mixing needle described in two The seam crossing of open tubular column component to be welded, including：Mixing needle is inserted to nine o'clock or the three position of the seam crossing of two open tubular column components to be welded.
- 6. friction stir welding method according to claim 4, it is characterised in that described to be welded along the seam crossing Connect, including：Two open tubular column component synchronous axial systems are driven by the external compression mechanism, make the mixing needle along the seam crossing Welded.
- 7. friction stir welding method according to claim 4, it is characterised in that the mixing needle is provided with fixing axle, institute It is hollow-core construction to state fixing axle, and the mixing needle is located in the cavity of the fixing axle, is leant out by adjusting the mixing needle The length of the cavity changes the intubating length of the mixing needle.
- 8. according to the friction stir welding method described in claim any one of 1-7, it is characterised in that the interior hold-down mechanism is worn If the end face of two open tubular column components to be welded on center shaft, is directed at described in step (3), including：The interior hold-down mechanism is slided along the central shaft axial direction, makes the external compression mechanism and open tubular column component to be welded With the interior hold-down mechanism synchronizing moving, until two open tubular column member end face docking to be welded.
- 9. friction stir welding method according to claim 1, it is characterised in that the open tubular column component is hollow cylinder Component, internal diameter 3-5mm, wall thickness 6-10mm.
- 10. friction stir welding method according to claim 1, it is characterised in that also include before step (1)：Interior hold-down mechanism assembly line is marked in the inner surface of open tubular column component to be welded, is drawn in the outer surface of the connection member to be welded Hold-down mechanism assembly line out.
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