CN104588867B - The healing process of high strength alumin ium alloy Sheet resistance nugget internal fissure - Google Patents
The healing process of high strength alumin ium alloy Sheet resistance nugget internal fissure Download PDFInfo
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- CN104588867B CN104588867B CN201410734673.XA CN201410734673A CN104588867B CN 104588867 B CN104588867 B CN 104588867B CN 201410734673 A CN201410734673 A CN 201410734673A CN 104588867 B CN104588867 B CN 104588867B
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- internal fissure
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- nugget
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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
- B23K20/123—Controlling or monitoring the welding process
-
- 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
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses the healing process of a kind of high strength alumin ium alloy Sheet resistance nugget internal fissure, for solving the inefficient technical problem of healing process of existing nugget formation in resistance spot welding internal fissure.Technical scheme is the mode using upper and lower shaft shoulder synchronous rotary frictional heat, in the top and bottom of tack-weld, same nugget internal fissure is carried out Double-side Synchronous healing processing, compared with facet successively healing processing, can shorten the friction time of staying, improve healing efficiency；For the feature of thin plate high strength alumin ium alloy spot-welded structures part non-deformability difference, utilize the self-supporting effect of the upper and lower shaft shoulder, be not required to backing plate, the high-volume healing of large-scale thin plate multiple spot welding structural member nugget internal fissure can be realized；The groove of healing tool rubbing face design band involute, is of value to the flowing of thermoplasticity metal, can promote the healing of internal fissure.
Description
Technical field
The present invention relates to the healing process of a kind of nugget formation in resistance spot welding internal fissure, particularly relate to a kind of high strength alumin ium alloy thin
The healing process of plate nugget formation in resistance spot welding internal fissure.
Background technology
High strength alumin ium alloy plastic zone is narrow, thermal conductance good, high-temp plastic is poor and linear expansion coefficient big, when resistance spot welding,
Its nugget process of setting will produce great shrinkage stress, be easy to crackle occur in nugget.Nugget internal fissure is in load
Can constantly extend under Zuo Yong, and ultimately result in structural break, cause the eventual failure of structure.Therefore, heal high-strength
Aluminium alloy resistance spot welding nugget internal fissure is significant.
Known for the underbead crack healing process such as have high temperature heat method, thermo-mechanical Coupled legal with pulse current method.High temperature
Heat energy method utilizes the principle of high temperature promotion atoms permeating to realize crack healing, needs structural member entirety is heated to a constant temperature
Spend and be incubated enough time, it is adaptable to the crackle that yardstick is less, but this method energy consumption is big, healing cycle length and the knot that can heal
Scantling is limited by high temperature furnace chamber size.On the basis of high temperature heat method, high temperature insostatic pressing (HIP) or forging method is used to execute
Afterburning effect, promotes that the thermo-mechanical Coupled of crack healing process is legal, and the crackle yardstick that can heal is relatively big, but technique is relative
Complexity, equally exists that energy consumption is big and the shortcoming of healing cycle length.Pulse current method relies on the heat that high impulse currents produces
Realizing the local passivation healing of crackle, healing quality is the highest, energy consumption big and can healed cracks yardstick less.
High temperature heat method is when healing contains the high strength alumin ium alloy point of resistance weldment of nugget internal fissure, and time long, high-temperature process can make
The hardening constituent of aluminium alloy reduces, and intensity reduces；Due to high strength alumin ium alloy conduction, heat conductivity good, utilize pulse current method
Consume energy during healing more；The Thermal-mechanical Coupling healing process using high temperature insostatic pressing (HIP) or forging and stamping force is not suitable for locating reason nugget even
The resistance spot welding structural member connect.
The document Chinese invention patent of CN103212778A " application publication number be " discloses a kind of based on agitating friction
Method for repairing crack, the method repairs with through-wall crack for plate shell metalloid body structure surface crackle, first basis
Crack position, size, material to be repaired manufacture and design friction fix tool with architectural feature etc..By fix tool
Rotate the friction realizing the shaft shoulder with repair materials surface, so that repairing district's metal to be issued to thermoplastic in the effect of frictional heat
Sexual state, utilize the rotation of the fix tool shaft shoulder and upset effect realize the flowing transfer of crackle surrounding thermoplastic's metal with
Dynamic recrystallization, thus realize crackle is filled up reparation.
Its single shaft shoulder has the method that pin fix tool repairs through-wall crack, single shaft shoulder needleless fix tool repairs face crack,
It is also unsuitable for the reparation of the resistance spot welding structural member nugget internal fissure of thin plate aluminum alloy.There is pin fix tool will destroy nugget,
When single shaft shoulder fix tool is applied to thin-plate element, backing plate must be added and support, and the healing of same nugget internal fissure needs positive and negative
Twice operation in face, efficiency is low.
Summary of the invention
In order to overcome the inefficient deficiency of healing process of existing nugget formation in resistance spot welding internal fissure, the present invention provides a kind of high
The healing process of strength aluminum alloy Sheet resistance nugget internal fissure.The method uses the friction of upper and lower shaft shoulder synchronous rotary to produce
The mode of heat, carries out Double-side Synchronous healing processing in the top and bottom of tack-weld to same nugget internal fissure, depends on facet
Secondary healing processing is compared, and can shorten the friction time of staying, improves healing efficiency；Tie for thin plate high strength alumin ium alloy spot welding
The feature of component non-deformability difference, utilizes the self-supporting effect of the upper and lower shaft shoulder, is not required to backing plate, can realize large-scale thin plate
The high-volume healing of multiple spot welding structural member nugget internal fissure；The groove of healing tool rubbing face design band involute, has
Benefit the flowing of thermoplasticity metal, the healing of internal fissure can be promoted.
The technical solution adopted for the present invention to solve the technical problems is: a kind of high strength alumin ium alloy Sheet resistance spot welding is melted
The healing process of core internal fissure, be characterized in use following steps:
Step one, upper healing instrument 1 and lower healing instrument 7 all select 4Cr5MoSiV1 hot die steel to make, the shaft shoulder
1.5～2.0 times of a diameter of tack-weld 4 impression diameter of 3, the rubbing surface 10 of the shaft shoulder 3 process 3 degree of depth be 0.2～
The involute groove of 0.4mm.
Step 2, determine healing technological parameter.
Rotary speed 2 is 930～970rpm, and the friction time of staying is 2～4s, and friction pressure F is 5800～6200N,
Upper and lower pressure amount is respectively 0.15～0.25mm, and upper and lower pressure speed is respectively 25～35mm/min.
Step 3, the upper and lower surface of use sand papering tack-weld 4, remove surface scale and dirt.
Step 4, spot weld is rigidly fixed.Start upper and lower healing instrument 1,7 synchronous rotary, when rotary speed reaches
To 930～970rpm and stable after, then with pressing healing instrument 1 and upper pressure healing instrument 7 at present, make the shaft shoulder 3
Rubbing surface 10 contact with the upper and lower surface of tack-weld 4, start friction；Upper and lower healing instrument 1,7 with 25～
Speed same pressure and upper pressure at present is pressed under 35mm/min, after reaching 0.15～0.25mm volume under pressure, when starting friction gauge,
Friction stops the upper and lower healing instrument 1,7 that simultaneously exits after 2～4s, terminates friction, stop upper and lower healing instrument 1,
The rotation of 7.
Step 5, transfer point welding structure part, to next one joint to be healed, repeat the operation of step 4.
Step 6, after until healing, joint is all disposed, the overlap 9 producing healing area processes.
The invention has the beneficial effects as follows: the method uses the mode of upper and lower shaft shoulder synchronous rotary frictional heat, in means of spot welds
The top and bottom of head carry out Double-side Synchronous healing processing to same nugget internal fissure, compared with facet successively healing processing, and can
Shorten the friction time of staying, improve healing efficiency；For thin plate high strength alumin ium alloy spot-welded structures part non-deformability difference
Feature, utilizes the self-supporting effect of the upper and lower shaft shoulder, is not required to backing plate, can realize large-scale thin plate multiple spot welding structural member nugget
The high-volume healing of internal fissure；The groove of healing tool rubbing face design band involute, is of value to the stream of thermoplasticity metal
Dynamic, the healing of internal fissure can be promoted.
With detailed description of the invention, the present invention is elaborated below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the inventive method healing high strength alumin ium alloy Sheet resistance nugget underbead crack process schematic.
Fig. 2 is the inventive method healing instrument and the rubbing surface schematic diagram of lower healing instrument.
In figure, 1-heals instrument, 2-rotary speed, the 3-shaft shoulder, 4-tack-weld, 5-nugget, 6-internal fissure,
Heal under 7-instrument, 8-volume under pressure, 9-overlap, 10-rubbing surface.
Detailed description of the invention
With reference to Fig. 1-2.The healing process concrete steps of high strength alumin ium alloy Sheet resistance nugget internal fissure of the present invention
As follows:
1, healing instrument is made.
Upper healing instrument 1 and lower healing instrument 7 all select 4Cr5MoSiV1 hot die steel to make, its shaft shoulder 3 straight
Footpath is 1.5-2.0 times of tack-weld 4 impression diameter.In order to promote the flowing of nugget 5 regional metal, it is achieved interior
The flowing transfer of crackle 6 surrounding thermoplastic's metal and dynamic recrystallization, process 3 degree of depth by the rubbing surface 10 of the shaft shoulder 3
Involute groove for 0.3mm.
2, healing parameter is determined.
The volume under pressure 8 of upper and lower healing instrument 1,7 is identical, and its value is slightly larger than the depth of cup of tack-weld 4.Rotate
The parameter such as speed 2, the friction time of staying, friction pressure F, down pressure speed, should be according to spot-welded structures part thickness, nugget
Size, internal fissure position and Dimension Synthesis thereof determine.
3, surface processes.
With the top and bottom of sand papering tack-weld 4, remove surface scale and dirt.
4, healing processing.
Spot weld is rigidly fixed.Start upper and lower healing instrument 1,7 synchronous rotary, when its rotary speed reaches to set
Rotary speed 2 and stable after, then with pressing healing instrument 1 and upper pressure healing instrument 7 at present, make the shaft shoulder 3
Rubbing surface 10 contacts with the upper and lower surface of tack-weld 4, starts friction；Upper and lower healing instrument 1,7 is with setting
Lower pressure speed is pressed down and upper pressure, after reaching the volume under pressure 8 set, when starting friction gauge, arrives the friction set
Exit upper and lower healing instrument 1,7 after the time of staying simultaneously, terminate friction, stop upper and lower healing instrument 1,7
Rotate.
5, transfer point welding structure part is to next one joint to be healed, and repeats the operation of step 4.
6, overlap processes.
After healing joint is all disposed, the overlap 9 producing healing area is uniformly processed.
The process of overlap 9 can as the case may be depending on.Overlap after single or a small amount of joint heals can directly utilize hands
Dynamic grinder buffing processes；Industrial mass production can use mechanical lapping mode, and the spot weld after healing passes sequentially through height
The abrasive disk that speed rotates, and inject lapping liquid, remove residue by cleaning brush dish again after grinding, it is ensured that batch is raw
High efficiency during product.
Embodiment.
1.5mm+1.5mm the healing of 2A12-T4 aluminium alloy pinpoint welding list nugget internal fissure.Nugget size 6.0mm, nugget
Highly 1.2mm, impression diameter 8.0mm, depth of cup 0.15mm；It is positioned at the internal fissure in nugget centre along knot
Conjunction face approximates distribution symmetrical above and below, and it is the most about 0.5～0.7mm, width about 0.03～0.05mm years old.Concrete steps are such as
Under:
1, upper healing instrument 1 and lower healing instrument 7 are made with 4Cr5MoSiV1 hot die steel.The diameter of the shaft shoulder 3
It is designed as 15mm, and the rubbing surface 10 of the shaft shoulder 3 is processed the involute groove that 3 degree of depth are 0.2～0.4mm.
2, choosing rotary speed 2 is 930～970rpm, friction the time of staying be 2～4s, friction pressure F be 5800～
6200N, upper and lower pressure amount is respectively 0.15～0.25mm, and upper and lower pressure speed is respectively 25～35mm/min.
3, with the top and bottom of sand papering tack-weld 4, surface scale and dirt are removed.
4, spot weld is rigidly fixed.Start upper and lower healing instrument 1,7 synchronous rotary, when its rotary speed reaches
930～970rpm and stable after, then with pressing healing instrument 1 and upper pressure healing instrument 7 at present, make the shaft shoulder 3
Rubbing surface 10 contacts with the upper and lower surface of tack-weld 4, starts friction；Upper and lower healing instrument 1,7 with 25～
Speed same pressure and upper pressure at present is pressed under 35mm/min, after reaching 0.15～0.25mm volume under pressure, when starting friction gauge,
Friction stops the upper and lower healing instrument 1,7 that simultaneously exits after 2～4s, terminates friction, stop upper and lower healing instrument 1,
The rotation of 7.
5, utilize hand operated grinding wheel that healing area is carried out the process of deflashing 9.
Claims (1)
1. the healing process of a high strength alumin ium alloy Sheet resistance nugget internal fissure, it is characterised in that include with
Lower step:
Step one, upper healing instrument (1) and lower healing instrument (7) all select 4Cr5MoSiV1 hot die steel to make,
1.5～2.0 times of a diameter of tack-weld (4) impression diameter of the shaft shoulder (3), the rubbing surface (10) of the shaft shoulder (3)
Process the involute groove that 3 degree of depth are 0.2～0.4mm；
Step 2, determine healing technological parameter；
Rotary speed 2 is 930～970rpm, and the friction time of staying is 2～4s, and friction pressure F is 5800～6200N,
Upper and lower pressure amount is respectively 0.15～0.25mm, and upper and lower pressure speed is respectively 25～35mm/min；
Step 3, the upper and lower surface of use sand papering tack-weld (4), remove surface scale and dirt；
Step 4, spot weld is rigidly fixed；Start upper and lower healing instrument (1,7) synchronous rotary, when rotating speed
After degree reaches 930～970rpm and stablizes, then with pressing healing instrument (1) and upper pressure healing instrument (7) at present,
Make the rubbing surface (10) of the shaft shoulder (3) contact with the upper and lower surface of tack-weld (4), start friction；Upper and lower
Healing instrument (1,7), to press speed with pressure and upper pressure at present under 25～35mm/min, reaches under 0.15～0.25mm
After pressure amount, when starting friction gauge, friction exits upper and lower healing instrument (1,7) after stopping 2～4s simultaneously, terminates to rub
Wipe, stop the rotation of upper and lower healing instrument (1,7)；
Step 5, transfer point welding structure part, to next one joint to be healed, repeat the operation of step 4；
Step 6, after until healing, joint is all disposed, the overlap (9) producing healing area processes.
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| CN201410734673.XA CN104588867B (en) | 2014-12-04 | 2014-12-04 | The healing process of high strength alumin ium alloy Sheet resistance nugget internal fissure |
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| CN201410734673.XA CN104588867B (en) | 2014-12-04 | 2014-12-04 | The healing process of high strength alumin ium alloy Sheet resistance nugget internal fissure |
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| KR101755884B1 (en) * | 2015-11-13 | 2017-07-07 | 현대자동차주식회사 | Damper Pulley Assembly For Vehicle |
| CN107433388B (en) * | 2017-09-12 | 2020-04-28 | 北京世佳博科技发展有限公司 | Repairing tool and repairing method for keyhole after friction stir welding |
| CN107876962A (en) * | 2017-11-20 | 2018-04-06 | 宁波金凤焊割机械制造有限公司 | Double-shaft shoulder stirring friction welding agitator head and its welding method |
| CN113275735B (en) * | 2021-06-22 | 2022-07-19 | 南昌航空大学 | Rotary friction extrusion auxiliary electromagnetic pulse material increase device and method |
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| KR100590616B1 (en) * | 2005-05-02 | 2006-06-19 | 한국기계연구원 | Method for spot welding metal plates by surface friction welding process |
| CN101053923A (en) * | 2007-05-21 | 2007-10-17 | 湖北汽车工业学院 | Stirring friction spot welding technology |
| CN202934233U (en) * | 2012-06-25 | 2013-05-15 | 湖北三江航天红阳机电有限公司 | Aluminum alloy weld surface defect repairing device |
| CN103949768B (en) * | 2014-05-05 | 2016-02-03 | 西北工业大学 | A kind of method eliminating friction stir spot welding Hook defect |
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