CN105397403A - Repairing method for aluminum alloy spot-welded joint - Google Patents
Repairing method for aluminum alloy spot-welded joint Download PDFInfo
- Publication number
- CN105397403A CN105397403A CN201510930505.2A CN201510930505A CN105397403A CN 105397403 A CN105397403 A CN 105397403A CN 201510930505 A CN201510930505 A CN 201510930505A CN 105397403 A CN105397403 A CN 105397403A
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- Prior art keywords
- welding
- hole
- aluminium alloy
- spot
- joint
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Classifications
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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
- B23P6/00—Restoring or reconditioning objects
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/3063—Electrode maintenance, e.g. cleaning, grinding
-
- 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)
- Resistance Welding (AREA)
Abstract
The invention discloses a repairing method for an aluminum alloy spot-welded joint. The method comprises the steps that a disqualified aluminum alloy spot-welded joint is provided; original welding spots on the disqualified aluminum alloy spot-welded joint are removed through a mechanical method, and a through hole with the diameter of 3-5 mm is manufactured; dirt on the disqualified aluminum alloy spot-welded joint is removed; the through hole is filled with a filling material and is pre-tightened, and the diameter of the filling material is larger than that of the through hole to achieve interference fit; and spot welding is carried out on the position, with the filling material, in the through hole through a direct-current welding machine so as to finish repairing. According to the method, the original welding points in a to-be-repaired spot welding area are removed firstly, one circular through hole is prefabricated, the cylindrical solid filling material with the common welding performance better than that of a base material is pressed in the prefabricated through hole, certain combining strength is achieved through interference fit, spot welding is carried out on the position with the filling material through a resistance spot welding method finally, and repairing is finished accordingly.
Description
Technical field
The present invention relates to welding technology field, be specifically related to a kind of restorative procedure of aluminium alloy pinpoint welding joint.
Background technology
The principle that resistance spot welding system adopts two-sided two point overcurrent to weld, during work, two electrode pressurization workpiece make double layer of metal form certain contact resistance under the pressure of two electrodes, and welding current from an electrode stream through another electrode time two contact resistance points formed moment resistance heat fusing materials to be welded, reach make them combine object high efficiency, low energy consumption, high production, simple operation and other advantages is widely used in the industry such as Aero-Space, electronics, automobile, household electrical appliance.
At present in order to reach the object of energy-saving and emission-reduction, automotive light weight technology is inevitable development trend.Aluminum alloy materials is the ideal material of automobile lightweight, the proportion of aluminium alloy is 1/3 of carbon steel, aluminum alloy materials is adopted to manufacture body of a motor car, under guarantee has the prerequisite of strength and stiffness same with steel, tare can reduce 50%, complete vehicle weight can reduce 10%, can reduce fuel consume and environmental pollution simultaneously.Resistance spot welding extensive use in the connection of aluminium alloy, especially in the automotive industry, so ensure that the quality of aluminium alloy pinpoint welding joint has very large realistic meaning for actual automobile production.But the spot weldability of aluminium alloy is also bad, the reasons such as the linear expansion coefficient due to aluminium is large, easily produce pore and crackle in condensation process after welding.In actual production process and postwelding military service process, easily produce the phenomenon of the defective inefficacy of solder joint.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of restorative procedure of aluminium alloy pinpoint welding joint is provided, first the method removes original solder joint in spot welding region to be repaired, and a prefabricated round tube hole, then a cylindric solid filling material (general weldability is better than mother metal) is pressed in prefabricated through hole, realize certain bond strength by interference fit, finally carry out spot welding at filler place, to complete reparation by the method for resistance spot welding.
The object of the invention is to be achieved through the following technical solutions:
A restorative procedure for aluminium alloy pinpoint welding joint, the method comprises:
Underproof aluminium alloy pinpoint welding joint is provided;
Make original solder joint of mechanically removing on defective aluminium alloy pinpoint welding joint and produce the through hole that diameter is 3-5mm;
Clear up the dirt on defective aluminium alloy pinpoint welding joint;
In described through hole, add packing material and pretension, the diameter of described packing material is greater than through-hole diameter to realize interference fit;
The packing material place of dc welding machine in described through hole is used to carry out spot welding to complete reparation.
Technological parameter during welding is: welding current is 15-17KA, and weld interval is 150-250ms, and electrode pressure is 2000-2500N, and slow rise time is 10-50ms.
The length of described packing material is greater than the thickness of defective aluminium alloy pinpoint welding joint.
Compared with prior art, the beneficial effect that technical scheme of the present invention is brought is:
(1) the present invention is by removing defective solder joint and adding the reparation that process that filler re-starts spot welding achieves aluminium alloy resistance spot welding, the method can extend the service life with defective solder joint workpiece on the one hand, production cost can be reduced on the other hand in manufacturing process, save material consumption, there is higher using value.
(2) the present invention is realizing, on the basis of repairing, compared to original qualified joint for resistance spot welding, obtaining larger nugget size, and improves the mechanical property of repairing tack-weld to a certain extent.
Accompanying drawing explanation
Fig. 1 is the preprosthetic macro morphology figure of defective aluminium alloy pinpoint welding joint.
Fig. 2 is the macro morphology figure after defective aluminium alloy pinpoint welding joint is repaired.
Fig. 3 is that the stress strain curve before and after the reparation of defective aluminium alloy pinpoint welding joint compares schematic diagram.
Fig. 4 (a) is the preprosthetic joint breaking pattern of defective aluminium alloy pinpoint welding joint; Fig. 4 (b) is the fracture apperance schematic diagram in Fig. 4 (a); Fig. 4 (c) is the close-up schematic view of Fig. 4 (b).
Fig. 5 (a) is the joint breaking pattern after defective aluminium alloy pinpoint welding joint is repaired; Fig. 5 (b) is the fracture apperance schematic diagram in Fig. 5 (a); Fig. 5 (c) is the close-up schematic view of Fig. 5 (b).
Detailed description of the invention
(1) inefficacy joint pre-treatment: underproof aluminium alloy pinpoint welding joint is provided, this enforcement is for 7075 aluminium alloys (its chemical composition is as shown in table 1), thickness of slab 1-2 millimeter, underproof tack-weld boring or other mechanical means are removed to original solder joint and precast the round tube hole that diameter is 3-5 millimeter, then adopts absolute ethyl alcohol to clear up the dirts such as the grease on its surface.Generally, must use in time after copy cleaning to be repaired, to avoid the impact of being infected with greasy dirt welding quality, otherwise need to re-start cleaning.
Table 1 (mass fraction %)
(2) packing material is added and pretension: the cylindrical aluminium alloy material that packing material generally selects weldability good is (as 5052 aluminium alloys, chemical composition is as shown in table 2), packing material diameter is slightly larger than prefabricated through-hole diameter to realize interference fit, and length is slightly larger than the gross thickness of copy to be repaired.Under certain pressure effect, filler is pressed in prefabricated round tube hole and realizes pretension.
Table 2 (mass fraction %)
(3) welding process: welding adopts DN800 type dc point welding machine to carry out, use in the present embodiment welding condition as shown in table 3.
Table 3
Below in conjunction with accompanying drawing, the inventive method is further described:
As shown in Figure 1, before reparation, 7075 spot welding for aluminum alloys inside also exist crackle and gas hole defect, and butt joint performance has very adverse influence, and joint is defective.
Figure 2 shows that the application of the invention method repair after shape appearance figure, effectively eliminates pore and crack defect, obtain acceptable splice, and nugget size is amid a sharp increase, be conducive to the lifting of joint performance.
Repaired the stress strain curve of front and back by contrast as can be seen from Fig. 3, after repairing, the tensile property of joint has obvious lifting.
By Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) known be interfacial fracture pattern in reparation front connector, and fracture has many shrinkage cavities, have obvious brittle failure feature, joint performance is poor.
Be part button fracture mode by Fig. 5 (a), Fig. 5 (b) and the known joint after repair of Fig. 5 (c), and fracture can be observed the tough socket bore of shearing, have certain ductile rupture feature, joint performance improves.
Claims (3)
1. a restorative procedure for aluminium alloy pinpoint welding joint, is characterized in that, the method comprises:
Underproof aluminium alloy pinpoint welding joint is provided;
Make original solder joint of mechanically removing on defective aluminium alloy pinpoint welding joint and produce the through hole that diameter is 3-5mm;
Clear up the dirt on defective aluminium alloy pinpoint welding joint;
In described through hole, add packing material and pretension, the diameter of described packing material is greater than through-hole diameter to realize interference fit;
The packing material place of dc welding machine in described through hole is used to carry out spot welding to complete reparation.
2. the restorative procedure of a kind of aluminium alloy pinpoint welding joint according to claim 1, it is characterized in that, technological parameter during welding is: welding current is 15-17KA, and weld interval is 150-250ms, and electrode pressure is 2000-2500N, and slow rise time is 10-50ms.
3. the restorative procedure of a kind of aluminium alloy pinpoint welding joint according to claim 1, is characterized in that, the length of described packing material is greater than the thickness of defective aluminium alloy pinpoint welding joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930505.2A CN105397403A (en) | 2015-12-14 | 2015-12-14 | Repairing method for aluminum alloy spot-welded joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930505.2A CN105397403A (en) | 2015-12-14 | 2015-12-14 | Repairing method for aluminum alloy spot-welded joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105397403A true CN105397403A (en) | 2016-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510930505.2A Pending CN105397403A (en) | 2015-12-14 | 2015-12-14 | Repairing method for aluminum alloy spot-welded joint |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108746960A (en) * | 2018-06-04 | 2018-11-06 | 南昌航空大学 | A kind of new method that the friction stir welding keyhole based on resistance plug welding principle is filled up |
Citations (6)
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|---|---|---|---|---|
| CN1938120A (en) * | 2004-01-27 | 2007-03-28 | Gm全球科技运作股份有限公司 | Method for joining two or several profiled parts or metal sheets which are mechanically joined and pressure-welded at one or several connection points |
| US20100243614A1 (en) * | 2009-03-30 | 2010-09-30 | United Technologies Corporation | Method of repairing holes using conductive heat resistance welding |
| CN103350276A (en) * | 2013-07-29 | 2013-10-16 | 天津大学 | Spot welding method and application thereof in aluminum alloy and steel |
| CN103612002A (en) * | 2013-10-29 | 2014-03-05 | 南京南车浦镇城轨车辆有限责任公司 | Stainless steel vehicle resistance spot welding splashing repairing method |
| CN103901098A (en) * | 2014-03-22 | 2014-07-02 | 国家电网公司 | Internal defect processing method for welded joint |
| CN104209624A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Special connector crack repair process method |
-
2015
- 2015-12-14 CN CN201510930505.2A patent/CN105397403A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1938120A (en) * | 2004-01-27 | 2007-03-28 | Gm全球科技运作股份有限公司 | Method for joining two or several profiled parts or metal sheets which are mechanically joined and pressure-welded at one or several connection points |
| US20100243614A1 (en) * | 2009-03-30 | 2010-09-30 | United Technologies Corporation | Method of repairing holes using conductive heat resistance welding |
| CN104209624A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Special connector crack repair process method |
| CN103350276A (en) * | 2013-07-29 | 2013-10-16 | 天津大学 | Spot welding method and application thereof in aluminum alloy and steel |
| CN103612002A (en) * | 2013-10-29 | 2014-03-05 | 南京南车浦镇城轨车辆有限责任公司 | Stainless steel vehicle resistance spot welding splashing repairing method |
| CN103901098A (en) * | 2014-03-22 | 2014-07-02 | 国家电网公司 | Internal defect processing method for welded joint |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108746960A (en) * | 2018-06-04 | 2018-11-06 | 南昌航空大学 | A kind of new method that the friction stir welding keyhole based on resistance plug welding principle is filled up |
| CN108746960B (en) * | 2018-06-04 | 2023-01-10 | 南昌航空大学 | Novel method for filling keyhole of friction stir welding based on resistance plug welding principle |
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Application publication date: 20160316 |