CN104588867A - High-strength aluminum alloy sheet resistance spot welding molten core inner crack healing method - Google Patents
High-strength aluminum alloy sheet resistance spot welding molten core inner crack healing method Download PDFInfo
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- CN104588867A CN104588867A CN201410734673.XA CN201410734673A CN104588867A CN 104588867 A CN104588867 A CN 104588867A CN 201410734673 A CN201410734673 A CN 201410734673A CN 104588867 A CN104588867 A CN 104588867A
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- healing
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- shaft shoulder
- spot welding
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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
-
- 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 a high-strength aluminum alloy sheet resistance spot welding molten core inner crack healing method. The method is used for solving the technical problem that an existing resistance spot welding molten core inner crack healing method is poor in efficiency. According to the technical scheme, the mode that an upper shaft shoulder and a lower shaft shoulder rotate and rub synchronously to generate heat is adopted, double-faced synchronous healing processing is conducted on the same molten core inner crack on an upper face and a lower face of a spot welding joint, compared with healing processing sequentially conducted on faces separately, the friction residence time can be shortened, and healing efficiency is improved; according to the characteristic that a high-strength sheet aluminum alloy spot welding structure piece is poor in deformation resistance, through self-supporting functions of the upper shaft shoulder and the lower shaft shoulder, no base plate is needed, and healing of mass molten core inner cracks of large sheet multi-point spot welding structure pieces can be achieved; the friction face of a healing tool is provided with a groove with an involute, flowing of thermoplastic metal is facilitated, and healing of the inner cracks can be promoted.
Description
Technical field
The present invention relates to a kind of healing process of nugget formation in resistance spot welding internal fissure, particularly relate to a kind of healing process of high strength alumin ium alloy Sheet resistance nugget 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 large, and when resistance spot welding, its nugget process of setting will produce great shrinkage stress, be easy to occur crackle in nugget.Nugget internal fissure can constantly be expanded under load effect, and finally causes structural break, causes the eventual failure of structure.Therefore, the high strength alumin ium alloy nugget formation in resistance spot welding that heals internal fissure is significant.
Known have high temperature heat method, thermo-mechanical Coupled legal in healing process such as pulse current methods for underbead crack.High temperature heat method utilizes high temperature to promote, and the principle of atoms permeating realizes crack healing, need structural parts whole is heated to uniform temperature and is incubated enough time, be applicable to the crackle that yardstick is less, but this method energy consumption is large, healing cycle is grown and healing structures part size can be limited by high temperature furnace chamber size.On the basis of high temperature heat method, adopt high temperature insostatic pressing (HIP) or forging method to apply the effect of power, promote that the thermo-mechanical Coupled of crack healing process is legal, the crackle yardstick that can heal is comparatively large, but technique relative complex, there is the shortcoming that energy consumption is large and healing cycle is long equally.The heat that pulse current method relies on high impulse currents to produce realizes the local passivation healing of crackle, and healing quality is not high, energy consumption large and can healed cracks yardstick less.
High temperature heat method is when healing the high strength alumin ium alloy point of resistance weldment containing nugget internal fissure, and time long, high-temperature process can make the hardening constituent of aluminium alloy reduce, and intensity reduces; Due to high strength alumin ium alloy conduction, thermal conductivity is good, consumes energy more when utilizing pulse current method heal; The Thermal-mechanical Coupling healing process of high temperature insostatic pressing (HIP) or forging and stamping force is adopted to be not suitable for processing the resistance spot welding structural member connected by nugget.
Document " application publication number is the Chinese invention patent of CN103212778A " discloses a kind of method for repairing crack based on agitating friction, the method is repaired for plate shell metalloid body structure surface crackle and through-wall crack, first manufactures and designs friction fix tool according to crack position, size, material to be repaired and architectural feature etc.The friction on the shaft shoulder and repair materials surface is realized by the rotation of fix tool, thus make reparation district metal be issued to hot plastic state in the effect of frictional heat, utilize the rotation of the fix tool shaft shoulder and upset effect to realize flowing transfer and the dynamic recrystallization of crackle surrounding thermoplastic metal, thus realize filling up reparation to crackle.
Its single shaft shoulder has the method that pin fix tool repairs through-wall crack, single shaft shoulder needleless fix tool repairs face crack, is also unsuitable for the reparation of the resistance spot welding structural member nugget internal fissure of thin plate aluminum alloy.Have pin fix tool to destroy nugget, when single shaft shoulder fix tool is applied to thin-plate element, must add backing plate and support, and the healing of same nugget internal fissure needs positive and negative twice operation, 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 invention provides a kind of healing process of high strength alumin ium alloy Sheet resistance nugget internal fissure.The method adopts the mode of upper and lower shaft shoulder synchronous rotary frictional heat, carries out Double-side Synchronous healing processing in the top and bottom of tack-weld to same nugget internal fissure, compared with point face 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, do not need backing plate, the healing in enormous quantities 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 promotes the healing of internal fissure.
The technical solution adopted for the present invention to solve the technical problems is: a kind of healing process of high strength alumin ium alloy Sheet resistance nugget internal fissure, is characterized in adopting following steps:
Step one, upper healing instrument 1 and lower healing instrument 7 all select 4Cr5MoSiV1 hot die steel to make, and the diameter of the shaft shoulder 3 is 1.5 ~ 2.0 times of tack-weld 4 impression diameter, and the rubbing surface 10 of the shaft shoulder 3 processes the involute groove that 3 degree of depth are 0.2 ~ 0.4mm.
Step 2, determine heal technological parameter.
Rotary speed 2 is 930 ~ 970rpm, and the friction time of staying is 2 ~ 4s, and friction pressure F is 5800 ~ 6200N, and upper and lower pressure amount is respectively 0.15 ~ 0.25mm, and upper and lower pressure speed is respectively 25 ~ 35mm/min.
The upper and lower surface of step 3, use sand papering tack-weld 4, removes surface scale and dirt.
Step 4, a weldment to be rigidly fixed.Start upper and lower healing instrument 1,7 synchronous rotary, after rotary speed reaches 930 ~ 970rpm and be stable, then press down healing instrument 1 and upper pressure healing instrument 7 simultaneously, make the rubbing surface 10 of the shaft shoulder 3 and the upper and lower surface contact of tack-weld 4, start friction; Upper and lower healing instrument 1,7 presses down speed with 25 ~ 35mm/min and presses down and upper pressure simultaneously, after reaching 0.15 ~ 0.25mm volume under pressure, when starting friction gauge, after friction stop 2 ~ 4s, exit upper and lower healing instrument 1,7 simultaneously, terminate friction, stop the rotation of upper and lower healing instrument 1,7.
Step 5, transfer point welding structure part to the next one wait joint of healing, and repeat the operation of step 4.
Step 6, after until healing, joint is all disposed, the overlap 9 that healing area produces to be processed.
The invention has the beneficial effects as follows: the method adopts the mode of upper and lower shaft shoulder synchronous rotary frictional heat, in the top and bottom of tack-weld, Double-side Synchronous healing processing is carried out to same nugget internal fissure, compared with point face successively healing processing, the friction time of staying can be shortened, 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, do not need backing plate, the healing in enormous quantities 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 promotes the healing of internal fissure.
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
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 rubbing surface schematic diagram of the inventive method healing instrument and lower healing instrument.
In figure, 1-heals instrument, 2-rotary speed, the 3-shaft shoulder, 4-tack-weld, 5-nugget, 6-internal fissure, and 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 are as follows:
1, healing instrument is made.
Upper healing instrument 1 and lower healing instrument 7 all select 4Cr5MoSiV1 hot die steel to make, and the diameter of its shaft shoulder 3 is 1.5-2.0 times of tack-weld 4 impression diameter.In order to promote the flowing of nugget 5 regional metal, realizing flowing transfer and the dynamic recrystallization of internal fissure 6 surrounding thermoplastic metal, the rubbing surface 10 of the shaft shoulder 3 is processed the involute groove that 3 degree of depth are 0.3mm.
2, the parameter that heals is determined.
The volume under pressure 8 of upper and lower healing instrument 1,7 is identical, and its value is a bit larger tham the depth of cup of tack-weld 4.Rotary speed 2, friction the time of staying, friction pressure F, press down the parameters such as speed, should determine according to spot-welded structures part thickness, nugget size, internal fissure position and Dimension Synthesis thereof.
3, surface treatment.
With the top and bottom of sand papering tack-weld 4, remove surface scale and dirt.
4, healing processing.
A weldment is rigidly fixed.Start upper and lower healing instrument 1,7 synchronous rotary, when its rotary speed reach setting rotary speed 2 and stable after, press down healing instrument 1 and upper pressure healing instrument 7 more simultaneously, the rubbing surface 10 of the shaft shoulder 3 is contacted with the upper and lower surface of tack-weld 4, start friction; Upper and lower healing instrument 1,7 presses down and upper pressure respectively with the speed that presses down of setting, after reaching the volume under pressure 8 of setting, when starting friction gauge, after arriving the friction time of staying of setting, exit upper and lower healing instrument 1,7 simultaneously, terminate friction, stop the rotation of upper and lower healing instrument 1,7.
5, transfer point welding structure part to the next one waits joint of healing, and repeats the operation of step 4.
6, overlap process.
After healing joint is all disposed, process is unified to the overlap 9 that healing area produces.
The process of overlap 9 can be determined as the case may be.Overlap after single or a small amount of joint healing can directly utilize hand operated grinding wheel grinding process; Industrial mass production can adopt mechanical lapping mode, and the some weldment after healing successively by the abrasive disk of High Rotation Speed, and injects lapping liquid, removes residue again after grinding by cleaning brush dish, guarantees high efficiency when producing in batches.
Embodiment.
1.5mm+1.5mm the healing of 2A12-T4 aluminium alloy pinpoint welding list nugget internal fissure.Nugget size 6.0mm, nugget height 1.2mm, impression diameter 8.0mm, depth of cup 0.15mm; The internal fissure being positioned at nugget centre is approximate symmetrical up and down along faying face, its highly about 0.5 ~ 0.7mm, width about 0.03 ~ 0.05mm.Concrete steps are as follows:
1, upper healing instrument 1 and lower healing instrument 7 is made with 4Cr5MoSiV1 hot die steel.The diameter design of the shaft shoulder 3 is 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, and the friction time of staying is 2 ~ 4s, and friction pressure F is 5800 ~ 6200N, and 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 is removed.
4, a weldment is rigidly fixed.Start upper and lower healing instrument 1,7 synchronous rotary, after its rotary speed reaches 930 ~ 970rpm and be stable, then press down healing instrument 1 and upper pressure healing instrument 7 simultaneously, the rubbing surface 10 of the shaft shoulder 3 is contacted with the upper and lower surface of tack-weld 4, start friction; Upper and lower healing instrument 1,7 presses down speed with 25 ~ 35mm/min and presses down and upper pressure simultaneously, after reaching 0.15 ~ 0.25mm volume under pressure, when starting friction gauge, after friction stop 2 ~ 4s, exit upper and lower healing instrument 1,7 simultaneously, terminate friction, stop the rotation of upper and lower healing instrument 1,7.
5, hand operated grinding wheel is utilized to carry out the process of deflashing 9 to healing area.
Claims (1)
1. a healing process for high strength alumin ium alloy Sheet resistance nugget internal fissure, is characterized in that comprising the following steps:
Step one, upper healing instrument (1) and lower healing instrument (7) all select 4Cr5MoSiV1 hot die steel to make, the diameter of the shaft shoulder (3) is 1.5 ~ 2.0 times of tack-weld (4) impression diameter, and rubbing surface (10) processing 3 degree of depth of the shaft shoulder (3) are the involute groove of 0.2 ~ 0.4mm;
Step 2, determine heal technological parameter;
Rotary speed 2 is 930 ~ 970rpm, and the friction time of staying is 2 ~ 4s, and friction pressure F is 5800 ~ 6200N, and upper and lower pressure amount is respectively 0.15 ~ 0.25mm, and upper and lower pressure speed is respectively 25 ~ 35mm/min;
The upper and lower surface of step 3, use sand papering tack-weld (4), removes surface scale and dirt;
Step 4, a weldment to be rigidly fixed; Start upper and lower healing instrument (1,7) synchronous rotary, after rotary speed reaches 930 ~ 970rpm and is stable, press down healing instrument (1) and upper pressure healing instrument (7) more simultaneously, make the rubbing surface of the shaft shoulder (3) (10) and the upper and lower surface contact of tack-weld (4), start friction; Upper and lower healing instrument (1,7) presses down speed with 25 ~ 35mm/min and presses down and upper pressure simultaneously, after reaching 0.15 ~ 0.25mm volume under pressure, when starting friction gauge, exit upper and lower healing instrument (1,7) after friction stop 2 ~ 4s simultaneously, terminate friction, stop the rotation of upper and lower healing instrument (1,7);
Step 5, transfer point welding structure part to the next one wait joint of healing, and repeat the operation of step 4;
Step 6, after until healing, joint is all disposed, the overlap (9) that healing area produces to be processed.
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| Application Number | Priority Date | Filing Date | Title |
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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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704549A (en) * | 2015-11-13 | 2017-05-24 | 现代自动车株式会社 | Damper pulley assembly for vehicle |
| CN107433388A (en) * | 2017-09-12 | 2017-12-05 | 北京世佳博科技发展有限公司 | A kind of agitating friction postwelding keyhole fix tool and restorative procedure |
| 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 |
| CN113275735A (en) * | 2021-06-22 | 2021-08-20 | 南昌航空大学 | Rotary friction extrusion auxiliary electromagnetic pulse material increase device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103949768A (en) * | 2014-05-05 | 2014-07-30 | 西北工业大学 | Method capable of overcoming friction stir spot welding Hook defect |
-
2014
- 2014-12-04 CN CN201410734673.XA patent/CN104588867B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103949768A (en) * | 2014-05-05 | 2014-07-30 | 西北工业大学 | Method capable of overcoming friction stir spot welding Hook defect |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704549A (en) * | 2015-11-13 | 2017-05-24 | 现代自动车株式会社 | Damper pulley assembly for vehicle |
| CN107433388A (en) * | 2017-09-12 | 2017-12-05 | 北京世佳博科技发展有限公司 | A kind of agitating friction postwelding keyhole fix tool and restorative procedure |
| 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 |
| CN113275735A (en) * | 2021-06-22 | 2021-08-20 | 南昌航空大学 | Rotary friction extrusion auxiliary electromagnetic pulse material increase device and method |
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| CN104588867B (en) | 2016-10-26 |
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