CN107160109B - A kind of method of aluminium-steel dissimilar metal rivet welding composite joint - Google Patents
A kind of method of aluminium-steel dissimilar metal rivet welding composite joint Download PDFInfo
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- CN107160109B CN107160109B CN201710478340.9A CN201710478340A CN107160109B CN 107160109 B CN107160109 B CN 107160109B CN 201710478340 A CN201710478340 A CN 201710478340A CN 107160109 B CN107160109 B CN 107160109B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- B23K20/1225—Particular aspects of welding with a non-consumable tool
-
- 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
- B23K20/1255—Tools therefor, e.g. characterised by the shape of the probe
-
- 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
- B23K2103/18—Dissimilar materials
- B23K2103/20—Ferrous alloys and aluminium or alloys thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The present invention provides a kind of aluminium-steel dissimilar metal rivet welding composite joint methods.The present invention provides a kind of aluminium-steel dissimilar metal rivet welding composite joint methods: carrying out preboring in the lap-joint of aluminium sheet and steel plate to be connected, obtains prebored hole；Rivet is penetrated into the prebored hole, makes head of a nail end face and the flush of aluminium sheet of rivet, the other end of rivet is higher than surface of steel plate；The first pushing is carried out to the surface of steel plate rivet that is higher than with the needleless stirring-head of rotation, contacts the end face of needleless stirring-head with surface of steel plate；The second pushing is then proceeded by, rivet is made to form countersunk head riveter in steel plate.The present invention can get the composite joint connector of the riveting of aluminium-steel dissimilar metal and Diffusion Welding, connector generates excessive weld metal zone brittle intermetallic thing when solving aluminum/steel dissimilar material fusion welding, the riveting disadvantage that center tap airtightness is bad, fatigue behaviour is poor, the two-fold advantage for realizing riveting and welding, increases connector tensile strength and fatigue behaviour.
Description
Technical field
The present invention relates to metal material processing technical field, in particular to a kind of aluminium-steel dissimilar metal rivet welding composite joint
Method.
Background technique
It is also higher and higher to light-weighted requirement with automobile, the development of airplane industry.In structured design process, optimization
Structure and selection light material become the significant design thinking for mitigating construction weight, therefore the connection of dissimilar metal is by more next
It is more widely applied, for example applies the connection of wide aluminium alloy and high-strength steel in the automotive industry, designed in type aircraft
In, to increase aircraft structure strength, fatigue life is improved, while mitigating aircraft weight, largely uses high-strength steel and light-alloy material
Expect composite construction.But it will lead to a large amount of weld metal zone brittle intermetallic things since melting welding heat input is excessive when the connection of dissimilar material
Generation, influence joint performance, therefore riveting technology is widely used in the connection of dissimilar material.
At present since traditional hammer riveting and pressure-riveting process are complicated, appearance molding is poor, low efficiency and it is not easy to be automated,
There is electromagnetic riveting and self-pierce riveting technology.Electromagnetism riveting is to utilize primary coil and secondary coil and amplification in electromagnetic equipment
Device and modulator, primary coil and secondary coil generate powerful eddy current magnetism at work, form powerful impact force, and with
The form of stress wave is propagated, and stress wave is propagated in the amplifier and by reflection and refraction, and rivet can be made complete in the extremely short time
At plastic deformation, compared to traditional riveting, electromagnetic riveting loading speed is high, and the joint fatigue service life is long, while can also rivet common
Riveting is difficult to the material riveted.But electromagnetic rivetter is expensive, and use cost is high, since Electromagnetic riveting technology is newer, about
The technical study of electromagnetism riveting is not also very mature.Self-pierce riveting is a kind of newer riveting technology, its principle is: formed punch pushes real
Heart rivet moves downward, and the cutting edge of rivet lower part will rivet material pressurization, and rivet reaches stop motion after cavity plate, with formed punch
It continues traveling downwardly, makes rivet that plastic deformation occur and inwardly make Radial Flow, so that it is tightly encased rivet, form stable locking shape
State.This technique does not need to carry out plate drilling processing, and riveting is high-efficient, and automation easy to accomplish.Self-pierce riveting at present
Main problem is easy to appear embrittlement when being to connect the not high material of some toughness, while needing the type according to riveting material thick
Degree designs different molds.
Also only simple mechanical connection, national patent CN105290608A disclose a kind of rivet to current riveting
Formula is mechanically connected auxiliary aluminum/steel dissimilar material agitating friction bridging method, to solve to connect between existing aluminum/steel dissimilar metal
During the brittle intermetallic compound of reaction generation easy both in soldering or fusion welding process and agitating friction weldering overlap joint
The problem of connector loaded area is small, slackens aluminum/steel dissimilar connector bearing capacity.Method: the one, edge on the lap width B of steel plate
Longitudinal centre line bores row's prebored hole；Two, the contact surface and surrounding of steel plate and aluminium sheet are cleaned out, removes steel plate and aluminium sheet
Oxide on surface；Three, using the surface of organic solvent or cleaning agent wiping steel plate and aluminium sheet；Four, with fixture by aluminium sheet and steel plate
Fixed, in stir friction welding process, stirring-head and aluminium sheet friction, the aluminium of softening flow downward the prebored hole filled on steel plate,
The connection structure of rivet type is formed, to acquire the aluminium/steel agitating friction lap joint strengthened through mechanical connection.This method
Addition rivet is not needed, is flowed to using the aluminium of plasticity and forms riveting in steel.This riveting technology main problem is to utilize softening
Aluminium fill prebored hole downwards, it is necessary to increase volume under pressure, it is deeper to will lead to upper plate impression in this way, influence joint performance and beauty,
Can exist there is also lower filled gold category simultaneously and fill insufficient equal filling defects.
Summary of the invention
The purpose of the present invention is to provide a kind of aluminium-steel dissimilar metal rivet welding composite joint methods.It is provided by the invention
Connector generates excessive weld metal zone brittle intermetallic thing when method solves aluminium and steel dissimilar material fusion welding, and cold punching causes in riveting
Cracking, the poor disadvantage of fatigue behaviour, there is the two-fold advantage of riveting and welding, increase connector tensile strength and fatigability
Energy.
The present invention provides a kind of aluminium-steel dissimilar metal rivet welding composite joint methods, comprising the following steps:
(1) preboring is carried out in the lap-joint of aluminium sheet and steel plate to be connected, obtains prebored hole；
(2) rivet is penetrated into the prebored hole, makes head of a nail end face and the flush of aluminium sheet of rivet, the other end of rivet
Higher than surface of steel plate；
(3) the first pushing is carried out to the surface of steel plate rivet that is higher than with the needleless stirring-head of rotation, makes needleless stirring-head
End face contacted with surface of steel plate；Friction welding (FW) is carried out after then proceeding by the second pushing.
Preferably, the aperture of prebored hole is 4~8mm in the step (1).
Preferably, the material of rivet is aluminium alloy in the step (2).
It preferably, is clearance fit between rivet and prebored hole in the step (2).
Preferably, rivet is higher than 2~6mm of surface of steel plate in the step (2).
Preferably, the end face diameter of needleless stirring-head is 2~3 times of rivet diameter in the step (3).
Preferably, the end face of needleless stirring-head has concave lines in the step (3).
Preferably, the rate rotated in the step (3) is 800~2000r/min.
Preferably, the second depth pushed is 0.1~0.3mm in the step (3).
Preferably, the time of friction welding (FW) is 10~120s in the step (3).
The present invention provides a kind of aluminium-steel dissimilar metal rivet welding composite joint methods, comprising the following steps: wait connect
Aluminium sheet and steel plate lap-joint carry out preboring, obtain prebored hole；Rivet is penetrated into the prebored hole, makes the head of a nail end face of rivet
It is higher than surface of steel plate with the other end of the flush of aluminium sheet, rivet；It is higher than steel plate table to described with the needleless stirring-head of rotation
Face rivet carries out first and pushes, and contacts the end face of needleless stirring-head with surface of steel plate；It is laggard to then proceed by the second pushing
Row friction welding (FW).The present invention welds Composite Joining Technique by riveting and agitating friction, utilizes needleless stirring-head and rivet and upper slab
The friction heat production of plate, realizes aluminium/steel diffusion connection of end face overlay area, while making the rivet expansion of plasticizing under pressure
It is filled with the gap between rivet and pre-punched hole afterwards, rivet plasticizing in top is pressed into upper plate, forms countersunk head riveter, solve
Connector generates excessive weld metal zone brittle intermetallic thing when aluminum/steel dissimilar material fusion welding, and riveting center tap airtightness is bad, tired
The poor disadvantage of performance realizes the two-fold advantage of riveting and welding, increases connector tensile strength and fatigue behaviour.Experimental result
Show that the connector peak shear strength that method provided by the invention obtains is 12.96kN, the connector than directly riveting is strong
Degree 8.58kN improves 51%, is 4.0kN in fatigue load, and when stress ratio R=0.1, the conventional rivet connection joint fatigue service life is 7.9
×104, compound riveting joint fatigue is 1.2 × 106, two orders of magnitude of fatigue life raising.
Detailed description of the invention
Fig. 1 is rivet welding compound connection structure schematic diagram in the present invention；
1 is needleless stirring-head in figure, and 2 be steel plate, and 3 be rivet, and 4 be aluminium sheet；
Fig. 2 is structural schematic diagram after the completion of rivet welding composite joint in the present invention.
Specific embodiment
The present invention provides a kind of aluminium-steel dissimilar metal rivet welding composite joint methods, comprising the following steps:
(1) preboring is carried out in the lap-joint of aluminium sheet and steel plate to be connected, obtains prebored hole；
(2) rivet is penetrated into the prebored hole, makes head of a nail end face and the flush of aluminium sheet of rivet, the other end of rivet
Higher than surface of steel plate；
(3) the first pushing is carried out to the surface of steel plate rivet that is higher than with the needleless stirring-head of rotation, makes needleless stirring-head
End face contacted with surface of steel plate；Friction welding (FW) is carried out after then proceeding by the second pushing.
The present invention carries out preboring in the lap-joint of aluminium sheet and steel plate to be connected, and obtains prebored hole.In the present invention, described
The aperture of prebored hole is preferably 4~8mm, more preferably 5~7mm, most preferably 6mm.The present invention does not have the operation of the preboring
Have special restriction, using the technical solution of drilling well known to those skilled in the art, such as using electric drill or drilling machine into
Row drilling.
In the present invention, the prebored hole of the aluminium sheet outer surface preferably has the counter sink with rivets.The present invention couple
The shape of the counter sink does not have special restriction, is adjusted according to the head of a nail shape of rivet.
The present invention does not have special restriction to the thickness of the aluminium sheet and steel plate, using aluminium well known to those skilled in the art
Plate and steel plate.In the present invention, the thickness of the aluminium sheet and steel plate is preferably independently 2~5mm, more preferably 3~
4mm.In the present invention, the material of the aluminium sheet is preferably pure aluminum or aluminum alloy.In the present invention, the material of the steel plate is preferred
For carbon steel or steel alloy；The surface of steel plate more preferably includes zinc coat, i.e. galvanized steel；The zinc coat makes to stir under end surface
Diffusion connection it is more preferable.
After the completion of preboring, the present invention preferably clears up the aluminium sheet to be connected and surface of steel plate.The present invention is to described
The not special restriction of the operation of cleaning, using the technical solution of removing surface well known to those skilled in the art.At this
In invention, the cleaning preferably successively includes deburring, polishing and cleaning.The present invention is not special to the operation of the deburring
Restriction, using the technical solution of deburring well known to those skilled in the art.In the present invention, the deburring makes riveting
Preferable cooperation is formed between nail and prebored hole, between aluminium sheet and steel plate.In the present invention, the polishing preferably uses sand paper,
More preferably 400# sand paper.In the present invention, the cleaning is preferably wiped with acetone.In the present invention, the polishing and clear
Washing can be plate surface light, remove the oxide layer and greasy dirt on surface.
After obtaining prebored hole, rivet is penetrated the prebored hole by the present invention, makes the head of a nail end face and the surface of aluminium sheet of rivet
Concordantly, the other end of rivet is higher than surface of steel plate.In the present invention, the material of the rivet is preferably aluminium alloy, more preferably
2xxx series or 7xxx series alloys, most preferably 2A14 aluminium alloy or 7A04 aluminium alloy.In the present invention, the 2A14 aluminium
Alloy or 7A04 aluminium alloy intensity with higher, can further increase switching performance.
It in the present invention, is preferably clearance fit between the rivet and prebored hole.In the present invention, the rivet is straight
Diameter is preferably 4~8mm, more preferably 5~7mm, most preferably 6mm.In the present invention, the clearance fit makes rivet be easy to wear
Enter prebored hole.In the present invention, the rivet is preferably higher than 2~6mm of surface of steel plate, more preferably 3~5mm, most preferably
4mm。
The present invention is preferably cleaned the rivet using preceding.The present invention is not special to the operation of the cleaning
It limits, using the technical solution of cleaning well known to those skilled in the art.In the present invention, the cleaning is preferred are as follows: will
Rivet is put into the sodium hydroxide solution that mass concentration is 25~35% and takes out after 25~35s；Being then placed in concentration is 8~12%
It is taken out after 8~12s in the solution of nitric acid, clear water rinses, then again with drying up after alcohol wipe.
After rivet penetrates the prebored hole, the aluminium sheet, steel plate and rivet are preferably carried out clamping by the present invention.The present invention couple
The not special restriction of the operation of the clamping, using installation way well known to those skilled in the art.For convenience of stirring
The operation of friction welding (FW), in the present invention preferably according to aluminium sheet under, steel plate carries out clamping in upper mode.
Rivet welding compound connection structure schematic diagram of the present invention is as shown in Figure 1.After the completion of clamping, the needleless of present invention rotation is stirred
It mixes head and the first pushing is carried out to the surface of steel plate rivet that is higher than, contact the end face of needleless stirring-head with surface of steel plate；Then
Friction welding (FW) is carried out after continuing the second pushing.In the present invention, the end face diameter of the needleless stirring-head is preferably that rivet is straight
2~3 times of diameter；More preferably 6~18mm, most preferably 12mm.In the present invention, the end face of the needleless stirring-head preferably has
There is concave lines.The present invention does not have special restriction to the shape and density of the concave lines, is capable of increasing stirring end surface
Friction.The present invention does not have special restriction to the type of the needleless stirring-head, using known to those skilled in the art
Friction stir welding machine stirring-head.In the present invention, the material of the needleless stirring-head be preferably high-temperature alloy steel or
Hard alloy.
In the present invention, the rate of the rotation is preferably 800~2000r/min, more preferably 1000~1800r/
Min, most preferably 1200~1600r/min.The rate that the present invention is pushed to described first does not have special restriction, using ability
Rate is pushed known to field technique personnel.In the present invention, during first pushing, when the stirring-head contacts riveting
After nail, the pushing rate is preferably 1.5~2.5mm/min, more preferably 2mm/min.In the present invention, it described first pushes
Pressure be preferably 5000~15000N, more preferably 8000~12000N, most preferably 10000N.In the present invention, described
During first pushes, under needleless stirring-head pressure and friction heat effect, the rivet of plasticizing is upsetting expansion, fill rivet and
Gap between prebored hole, and it is pressed into rivet top in steel plate, form countersunk head riveter.
After the end face of needleless stirring-head is contacted with surface of steel plate, the present invention makes the needleless stirring-head of rotation continue second
It pushes.In the present invention, the second pushing rate is preferably 1.5~2.5mm/min, more preferably 2mm/min.In the present invention
In, the described second pressure pushed is preferably 5000~15000N, more preferably 8000~12000N, most preferably 10000N.
In the present invention, the described second depth pushed is preferably 0.1~0.3mm, more preferably 0.2mm.
The present invention stops pushing, carries out friction welding (FW) after the completion of described second pushes.In the present invention, the friction welding (FW)
Time be preferably 10~120s, more preferably 20~40s.In the present invention, in the friction welding process, in needleless stirring-head
Diffusion connection is formd on end face and steel plate friction region aluminium below/steel interface.Workpiece structure after the completion of rivet welding composite joint
Schematic diagram is as shown in Figure 2.
The present invention utilizes the friction heat production of needleless stirring-head and rivet and steel plate, acts in frictional heat and stirring-head pressure
Under, the aluminium rivet of plasticizing is upsetting, and is filled with the gap between rivet and pre-punched hole, and rivet plasticizing in top is pressed into upper plate,
Countersunk head riveter is formed, the purely mechanic connection of riveted joint is avoided, without metallurgical bonding, airtightness bad problem and riveting
The poor disadvantage of cracking, fatigue behaviour caused by middle cold punching；Simultaneously in stirring end surface and upper plate friction area aluminium/steel below
Diffusion connection is formd on interface, metal is non-fusible, and connector generates excessively crisp when solving aluminium and steel dissimilar material fusion welding
The problem of property intermetallic compound；Two-fold advantage with riveting and welding, increases connector tensile strength and fatigue behaviour.
In order to further illustrate the present invention, multiple to aluminium provided by the invention-steel dissimilar metal rivet welding below with reference to embodiment
The method for closing connection is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1:
The 2A14 aluminium alloy of 4mm thickness is cut into 100mm × 40mm × 4mm specification size plate first, it is same to choose
The galvanized steel plain sheet of 2mm thickness is cut into 100mm × 40mm × 2mm size sample to be welded, and the drill bit for being 4mm with diameter is bored in riveting point
It is polished interface with the sand paper of 400#, while drilling burr is carried out clearly with file in lower part of steel plate burr-drill shape counter sink in hole
Reason, is finally cleaned with acetone butt joint；
The rivet with taper riveter cleaned is penetrated from below, rivet bar is 2A14 aluminium alloy, rivet bottom
It is flushed with lower plate bottom, top is higher by upper face 4mm, and clamping is to be welded；
It is rotated and is pressed into using the stirring-head of the needle without mixing of 12mm diameter end face, Rotating speed 1500r/min,
When stirring end surface and upper plate contacts, then 0.2mm is pushed, 30s is kept to complete welding.
Rivet welding composite joint sample is stretched using stretching-machine, fracture occurs at interface, and shear fracture occurs for rivet,
Peak shear strength is 6.53kN, and the connector tension of conventional rivet connection shearing is only 4.39kN, is welded using agitating friction riveting
To composite-joint than it is single riveting weldering strength of joint improve 48.7%；It is 2.5kN, stress ratio R=0.1 in fatigue load
When, the conventional rivet connection joint fatigue service life is 5.2 × 104, compound riveting joint fatigue is 9.2 × 105, fatigue life raising one
The order of magnitude.
Embodiment 2:
The 2A14 aluminium alloy of 4mm thickness is cut into 100mm × 40mm × 4mm specification size plate first, it is same to choose
The galvanized steel plain sheet of 2mm thickness is cut into 100mm × 40mm × 2mm size sample to be welded, and the drill bit for being 6mm with diameter is bored in riveting point
It is polished interface with the sand paper of 400#, while drilling burr is carried out clearly with file in lower part of steel plate burr-drill shape counter sink in hole
Reason, is finally cleaned with acetone butt joint；
The rivet with taper riveter cleaned is penetrated from below, rivet bar is 7A04 aluminium alloy, rivet bottom
It is flushed with lower plate bottom, top is higher by upper face 4mm, and clamping is to be welded；
It is rotated and is pressed into using the stirring-head of the needle without mixing of 16mm diameter end face, Rotating speed 1500r/min,
When stirring end surface and upper plate contacts, then 0.2mm is pushed, weld interval 30s.
Welded specimen is stretched using stretching-machine, fracture occurs at interface, and shear fracture, maximum shear occur for rivet
Intensity is 12.96kN, and the strength of joint 8.58kN than directly riveting improves 51%；It is 4.0kN, stress in fatigue load
When than R=0.1, the conventional rivet connection joint fatigue service life is 7.9 × 104, compound riveting joint fatigue is 1.2 × 106, fatigue life
Improve two orders of magnitude.
As can be seen from the above embodiments, connector when method provided by the invention solves aluminum/steel dissimilar material fusion welding
Generate excessive weld metal zone brittle intermetallic thing, the riveting disadvantage that center tap airtightness is bad, fatigue behaviour is poor, realize riveting and
The two-fold advantage of welding increases connector tensile strength and fatigue behaviour.
The above is only a preferred embodiment of the present invention, it is not intended to limit the present invention in any form.It should
It points out, for those skilled in the art, without departing from the principle of the present invention, if can also make
Dry improvements and modifications, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (9)
1. a kind of aluminium-steel dissimilar metal rivet welding composite joint method, comprising the following steps:
(1) preboring is carried out in the lap-joint of aluminium sheet and steel plate to be connected, obtains prebored hole；
(2) rivet is penetrated into the prebored hole, makes head of a nail end face and the flush of aluminium sheet of rivet, the other end of rivet is higher than
Surface of steel plate is clearance fit between rivet and prebored hole；
(3) the first pushing is carried out to the surface of steel plate rivet that is higher than with the needleless stirring-head of rotation, makes the end of needleless stirring-head
Face is contacted with surface of steel plate；Friction welding (FW) is carried out after then proceeding by the second pushing.
2. the method according to claim 1, wherein the aperture of prebored hole is 4~8mm in the step (1).
3. the method according to claim 1, wherein the material of rivet is aluminium alloy in the step (2).
4. the method according to claim 1, wherein rivet is higher than 2~6mm of surface of steel plate in the step (2).
5. the method according to claim 1, wherein the end face diameter of needleless stirring-head is in the step (3)
2~3 times of rivet diameter.
6. method according to claim 1 or 5, which is characterized in that the end face of needleless stirring-head has in the step (3)
Concave lines.
7. the method according to claim 1, wherein the rate rotated in the step (3) is 800~2000r/
min。
8. the method according to claim 1, wherein in the step (3) second push depth be 0.1~
0.3mm。
9. method according to claim 1 or 8, which is characterized in that in the step (3) time of friction welding (FW) be 10~
120s。
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| CN201710478340.9A CN107160109B (en) | 2017-06-22 | 2017-06-22 | A kind of method of aluminium-steel dissimilar metal rivet welding composite joint |
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| CN201710478340.9A CN107160109B (en) | 2017-06-22 | 2017-06-22 | A kind of method of aluminium-steel dissimilar metal rivet welding composite joint |
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| CN107160109B true CN107160109B (en) | 2019-05-03 |
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| CN114378421B (en) * | 2020-10-21 | 2023-05-19 | 上海汽车集团股份有限公司 | Method for welding metal pieces with different hardness and welded product of metal pieces with different hardness |
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