CN103350276A - Spot welding method and application thereof in aluminum alloy and steel - Google Patents
Spot welding method and application thereof in aluminum alloy and steel Download PDFInfo
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- CN103350276A CN103350276A CN2013103250521A CN201310325052A CN103350276A CN 103350276 A CN103350276 A CN 103350276A CN 2013103250521 A CN2013103250521 A CN 2013103250521A CN 201310325052 A CN201310325052 A CN 201310325052A CN 103350276 A CN103350276 A CN 103350276A
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Abstract
The invention discloses a spot welding method. Aiming at aluminum alloy plates, aluminum alloy and various steel dissimilar materials, the method adds a solid adding material which is generally a rivet in a welded plate and then carries out spot welding at the riveting place. The tensile strength of a spot-welding lap joint which is welded with the method is higher than that of a spot-welding test piece which is welded under same parameters, meanwhile the welding quality of the spot-welding lap joint is good, and the spot-welding lap joint does not have obvious cracks or gas holes.
Description
Technical field
The present invention relates to the resistance spot welding solder technology, more specifically, relate to the sheet material spot-welded on technical field of aluminium alloy and steel.
Background technology
Resistance spot welding system adopts the principle of two-sided two point overcurrent welding, two electrode pressurization workpiece make double layer of metal form certain contact resistance under the pressure of two electrodes during work, and welding current forms the resistance heat fusing materials to be welded of moment when another electrode at 2 contact resistance points from an electrode stream, reach the purpose high efficiency, low energy consumption, the high production that make their combinations, simple operation and other advantages is widely used in the industry such as Aero-Space, electronics, automobile, household electrical appliance.The weldability of aluminium alloy because the linear expansion coefficient of aluminium is large, easily produces pore and crackle in the condensation process after welding, easily produce pore in the process, and is yielding, forms pitfall around the molten bath, affect welding quality, so the weldability of aluminium alloy is relatively poor.
Summary of the invention
Technical purpose of the present invention is to overcome the deficiencies in the prior art, utilizes the characteristics of resistance spot welding, for the welding of aluminium alloy and steel sheet material, proposes a kind of new spot welding method.
Technical purpose of the present invention is achieved by following technical proposals:
Spot welding method before carrying out spot welding, is pressed in the boring of the center of adjacent materials connecting portion (being overlap) and with connecting material, to connect adjacent materials, then carries out resistance spot welding and gets final product.
In technical scheme of the present invention, described connecting material is selected rivet, for example aluminium rivet, copper rivet or steel rivet, and diameter is selected 1-10mm; In being pressed into the process that connects, select the mode of being riveted.
In technical scheme of the present invention, after connecting in advance, carry out again resistance spot welding, welding parameter: welding current 10-19KA, electrode pressure 0.1-0.3MPa, squeeze time 100-900ms, weld interval 100-900ms; The preferred weld parameter: welding current 12-16KA, electrode pressure 0.2-0.3MPa, squeeze time 300-600ms, weld interval 200-700ms.
Spot welding method of the present invention can carry out practical application at aluminium alloy and steel, comprises the aluminum alloy plate materials of complete series, and different types of steel, and material thickness is 0.5-20mm for example.Material to be welded with connecting material, is selected same material, for example welds the Q235 steel and adds metal bar Q235 steel, welds 5052 aluminium alloys and adds metal bar 5052 aluminium alloys; Also can select two kinds to be different materials, for example weld 7075 aluminium alloy sheets and add 5052 aluminium alloys, welding DP600 ultrafort steel adds the Q235 steel.
Advantage and good effect that the present invention has are: by the adding of metal charge, in welding process, connecting material forms effective the connection with the sheet material contact-making surface, up and down material to be welded be by connecting material with material to be welded (being mother metal) thus between form under the comprehensive function of electrode pressure and heat energy solid phase connect about material to be welded, than traditional spot welding (effectively connect is that spot welding forms the nugget place), connection area has increased 3-5 doubly, metal bar is regional with the relative nugget in sheet material contact-making surface zone simultaneously, the heat input is less, the weld defect that forms is also less, therefore the relatively traditional spot welding of spot welding hot strength of adopting this new method to obtain has improved 40% even higher, while is based on the analysis of stress strain curve, its fatigue behaviour has also obtained certain lifting, be that the welding quality of welding point is put and welded, do not have obvious crackle and pore.
Description of drawings
Fig. 1 is before welding in the technical solution of the present invention, the connection diagram of connecting material and material to be welded (top view), and wherein 1 is material to be welded, 2 is connecting material.
Fig. 2 is before welding in the technical solution of the present invention, the connection diagram of connecting material and material to be welded (side view), and wherein 1 is material to be welded, and 2 is connecting material, and 3 is overlap.
Fig. 3 is the schematic diagram when carrying out resistance spot welding in the technical solution of the present invention, and wherein 1 is material to be welded, and 2 is connecting material, and 3 is overlap, and 4 is the spot-wedling electrode head.
Fig. 4 is the comparison diagram that technical solution of the present invention and conventional point postwelding sample carry out stress strain curve, and wherein 1 for utilizing the stress strain curve of technical solution of the present invention point postwelding, and 2 is the stress strain curve of conventional point postwelding, and 3 is time phenomenon position, peak of curve 1.
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with specific embodiment.
First group, weld 7075 aluminium alloy sheets (thickness 1mm, length 100mm, width 30mm, the long 30mm of overlap), to press overlapping mode and then metal bar pressure is added in the boring of overlap joint center, the metal bar material is 5052 aluminium alloys, diameter 3mm, length 3mm
Second group, welding Q235 steel (thickness 2mm, length 100mm, width 30mm, the long 30mm of overlap) is filled metal bar Q235 steel (diameter 3mm, length 6mm)
The 3rd group, weld 5052 aluminium alloys (thickness 2mm, length 100mm, width 30mm, the long 30mm of overlap), fill metal bar 5052 aluminium alloys (diameter 3mm, length 6mm)
The 4th group, welding DP600 ultrafort steel (thickness 2mm, length 100mm, width 30mm, the long 30mm of overlap) is filled metal bar Q235 steel (diameter 3mm, length 6mm)
The cleaning of oxide-film is carried out in i.e. riveted joint place in zone to be welded of four groups of test specimens, avoided affecting point quality.
Adopt the resistance spot welding mode to weld, every group selection selects respectively following technique to carry out
| Numbering | Welding current (KA) | Electrode pressure (MPa) | Squeeze time (ms) | Weld interval (ms) |
| 1 | 10 | 0.1 | 900 | 700 |
| 2 | 18 | 0.1 | 700 | 900 |
| 3 | 12 | 0.3 | 600 | 400 |
| 4 | 15 | 0.3 | 500 | 200 |
| 5 | 16 | 0.2 | 300 | 500 |
| 6 | 19 | 0.2 | 100 | 100 |
To adopt the sheet material of the invention described above technical method welding to carry out tension test, average as its hot strength, stretching machine is the Changchun CSS-44100 of experimental machine research institute almighty test machine (test is prepared according to its requirement), test speed is 0.5mm/min, simultaneously the sheet material that carries out the resistance spot welding weldment under the equal conditions is carried out tension test; Result of the test is as shown in the table, namely by test result analysis, adopts new method to compare traditional spot welding, and its hot strength is improved significantly.
As shown in Figure 4, new method has been walked 4mm after reaching maximum load stroke lost efficacy, and simultaneously curve downward trend is slow, gets started decline after resistance spot welding curve load reaches maximum, does not almost have the process that keeps.Can see thus
Go out, new method connects effect and is better than the traditional resistor point, and its welding point plasticity is also better, therefore analyzes to draw relatively traditional spot welding fatigue behaviour and get a promotion.
More than the present invention has been done exemplary description; should be noted that; in the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (10)
1. spot welding method is characterized in that, before carrying out spot welding, is pressed in the boring of the center of adjacent materials connecting portion and with connecting material, to connect adjacent materials, then carries out resistance spot welding and gets final product.
2. spot welding method according to claim 1 is characterized in that, described connecting material is selected rivet.
3. spot welding method according to claim 2 is characterized in that, described rivet is aluminium rivet, copper rivet or steel rivet.
4. according to claim 1 or 2 described spot welding methods, it is characterized in that the diameter of described connecting material is selected 1-10mm.
5. spot welding method according to claim 1 is characterized in that, selects the mode of being riveted in being pressed into the process that connects.
6. spot welding method according to claim 1 is characterized in that, after connecting in advance, carries out resistance spot welding, welding parameter again: welding current 10-19KA, electrode pressure 0.1-0.3MPa, squeeze time 100-900ms, weld interval 100-900ms.
7. spot welding method according to claim 6 is characterized in that, the preferred weld parameter: welding current 12-16KA, electrode pressure 0.2-0.3MPa, squeeze time 300-600ms, weld interval 200-700ms.
8. the application of spot welding method as claimed in claim 1 in aluminum alloy plate materials and steel resistance spot welding.
9. the application of spot welding method according to claim 8 in aluminum alloy plate materials and steel resistance spot welding is characterized in that material to be welded, with connecting material, select same material, for example weld the Q235 steel and add metal bar Q235 steel, weld 5052 aluminium alloys and add metal bar 5052 aluminium alloys.
10. the application of spot welding method according to claim 8 in aluminum alloy plate materials and steel resistance spot welding, it is characterized in that, material to be welded, with connecting material, selecting two kinds is different materials, for example weld 7075 aluminium alloy sheets and add 5052 aluminium alloys, welding DP600 ultrafort steel adds the Q235 steel.
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| CN2013103250521A CN103350276A (en) | 2013-07-29 | 2013-07-29 | Spot welding method and application thereof in aluminum alloy and steel |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103624384A (en) * | 2013-12-19 | 2014-03-12 | 中冶建工集团有限公司 | Butt joint equal-strength welding connector for reinforcing steel bars |
| CN105397403A (en) * | 2015-12-14 | 2016-03-16 | 天津大学 | Repairing method for aluminum alloy spot-welded joint |
| CN105478982A (en) * | 2015-12-03 | 2016-04-13 | 天津大学 | Resistance plug welding method of aluminum alloy-high-strength steel |
| CN105618916A (en) * | 2016-03-21 | 2016-06-01 | 攀钢集团西昌钢钒有限公司 | Welding method for 980MPa-level cold-rolled dual-phase steel |
| CN107160109A (en) * | 2017-06-22 | 2017-09-15 | 南昌航空大学 | A kind of method of aluminum steel dissimilar metal rivet welding composite joint |
| CN107234327A (en) * | 2017-05-27 | 2017-10-10 | 天津大学 | Sheet metal stings weldering composite connecting device and method |
| CN107252986A (en) * | 2017-05-31 | 2017-10-17 | 福州联泓交通器材有限公司 | A kind of welding fixture and its application method |
| CN108788423A (en) * | 2018-06-27 | 2018-11-13 | 南昌航空大学 | A kind of welder connected for T-type between ultra thin plate and Thin-diameter rod |
| CN109202247A (en) * | 2018-10-26 | 2019-01-15 | 湖北工业大学 | A kind of welding method of aluminium alloy and steel |
| CN109982804A (en) * | 2016-11-14 | 2019-07-05 | 株式会社神户制钢所 | Bonded structure and its manufacturing method |
| CN110834139A (en) * | 2018-08-16 | 2020-02-25 | 中国科学院上海光学精密机械研究所 | Method for resistance spot welding of dissimilar metals |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103624384B (en) * | 2013-12-19 | 2016-04-06 | 中冶建工集团有限公司 | Steel reinforcement abutting joints equal strength welding point |
| CN103624384A (en) * | 2013-12-19 | 2014-03-12 | 中冶建工集团有限公司 | Butt joint equal-strength welding connector for reinforcing steel bars |
| CN105478982A (en) * | 2015-12-03 | 2016-04-13 | 天津大学 | Resistance plug welding method of aluminum alloy-high-strength steel |
| CN105397403A (en) * | 2015-12-14 | 2016-03-16 | 天津大学 | Repairing method for aluminum alloy spot-welded joint |
| CN105618916A (en) * | 2016-03-21 | 2016-06-01 | 攀钢集团西昌钢钒有限公司 | Welding method for 980MPa-level cold-rolled dual-phase steel |
| CN109982804A (en) * | 2016-11-14 | 2019-07-05 | 株式会社神户制钢所 | Bonded structure and its manufacturing method |
| CN107234327A (en) * | 2017-05-27 | 2017-10-10 | 天津大学 | Sheet metal stings weldering composite connecting device and method |
| CN107252986A (en) * | 2017-05-31 | 2017-10-17 | 福州联泓交通器材有限公司 | A kind of welding fixture and its application method |
| CN107252986B (en) * | 2017-05-31 | 2023-03-10 | 福州联泓交通器材有限公司 | Welding jig and using method thereof |
| CN107160109A (en) * | 2017-06-22 | 2017-09-15 | 南昌航空大学 | A kind of method of aluminum steel dissimilar metal rivet welding composite joint |
| CN107160109B (en) * | 2017-06-22 | 2019-05-03 | 南昌航空大学 | A kind of method of aluminium-steel dissimilar metal rivet welding composite joint |
| CN108788423A (en) * | 2018-06-27 | 2018-11-13 | 南昌航空大学 | A kind of welder connected for T-type between ultra thin plate and Thin-diameter rod |
| CN108788423B (en) * | 2018-06-27 | 2019-11-29 | 南昌航空大学 | A kind of welding method for realizing that T-type connects between ultra thin plate and Thin-diameter rod |
| CN110834139A (en) * | 2018-08-16 | 2020-02-25 | 中国科学院上海光学精密机械研究所 | Method for resistance spot welding of dissimilar metals |
| CN110834139B (en) * | 2018-08-16 | 2022-03-08 | 中国科学院上海光学精密机械研究所 | Method for resistance spot welding of dissimilar metals |
| CN109202247A (en) * | 2018-10-26 | 2019-01-15 | 湖北工业大学 | A kind of welding method of aluminium alloy and steel |
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Application publication date: 20131016 |