CN109048013B - Dissimilar material connecting device based on multi-foot connecting piece - Google Patents
Dissimilar material connecting device based on multi-foot connecting piece Download PDFInfo
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- CN109048013B CN109048013B CN201810875812.9A CN201810875812A CN109048013B CN 109048013 B CN109048013 B CN 109048013B CN 201810875812 A CN201810875812 A CN 201810875812A CN 109048013 B CN109048013 B CN 109048013B
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- connecting piece
- layer sample
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
- B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
Abstract
The invention relates to the technical field of resistance welding, in particular to a dissimilar material connecting device based on a multi-pin connecting piece, which comprises: the device comprises a power supply, an upper electrode, a multi-foot connecting piece, an upper layer sample, a lower layer sample and a lower electrode. One end of the power supply is connected with an upper electrode, and the upper electrode is arranged above the lower electrode; the upper layer sample and the lower layer sample are arranged between the upper electrode and the lower electrode, the upper layer sample is attached above the lower layer sample, and the lower layer sample is attached to the lower electrode; the lower electrode is connected with the other end of the power supply. The multi-foot connecting piece is arranged between the upper electrode and the upper layer sample, the upper part of the multi-foot connecting piece is abutted to the upper electrode, and the foot part of the multi-foot connecting piece is abutted to the upper layer sample. The heterogeneous material connecting device based on the multi-foot connecting piece solves the problems that different materials are large in physical and chemical characteristic difference and prone to generate a brittle phase through a chemical reaction, and the connecting strength is insufficient; the multi-legged connector can remarkably improve the positive pulling performance and the torsion resistance of the connector.
Description
Technical Field
The invention relates to the technical field of resistance welding, in particular to a dissimilar material connecting device based on a multi-pin connecting piece.
Background
Resistance spot welding is an important material connection method and is widely applied to industries such as automobiles and the like. The welding process is realized under the action of pressure, the welded workpieces are tightly contacted by external force during welding, and the welding current releases resistance heat through the workpieces to realize welding.
In conventional resistance spot welding, an upper layer sample and a lower layer sample are generally placed between an upper electrode and a lower electrode of resistance spot welding equipment, wherein the upper electrode and the lower electrode are respectively connected with a power supply through electric conductors. The upper layer sample and the lower layer sample are clamped by applying pressure between the upper electrode and the lower electrode, and then current is output by the power supply and passes through the upper electrode, the upper layer sample, the lower layer sample and the lower electrode. According to joule's law, produce heat between upper sample and lower floor's sample, finally form the nugget for form metallurgical bonding between upper sample and the lower floor's sample, reach the purpose of connecting.
The method is widely applied to the connection of the same materials, particularly steel materials. In recent years, with the application of lightweight materials, the requirement for connection of dissimilar materials is increasing, and the conventional resistance spot welding method cannot adapt to the requirement for connection of dissimilar materials. The main reasons are: the difference in physical and chemical properties between different materials is large, and a chemical reaction between different materials easily occurs to generate a brittle phase, resulting in insufficient connection strength. For example, in resistance spot welding of steel and aluminum, the solid solubility between steel and aluminum alloy is low and the difference in physical properties is large. The melting point of steel is higher than that of aluminum alloy, and during welding, when the aluminum alloy is completely melted into liquid, the steel is still in a solid state. Aluminum alloy and steel can generate brittle and hard intermetallic compounds at a connecting interface during spot welding, and the service performance of a joint is directly influenced.
Disclosure of Invention
The invention provides a dissimilar material connecting device based on a multi-foot connecting piece, and solves the technical problems that dissimilar materials are difficult to weld and welding quality is poor in the prior art.
The embodiment of the invention provides a dissimilar material welding device based on a multi-foot connecting piece, which comprises: the device comprises a power supply, an upper electrode, a multi-foot connecting piece, an upper layer sample, a lower layer sample and a lower electrode;
one end of the power supply is connected with the upper electrode, and the upper electrode is arranged above the lower electrode; the upper layer sample and the lower layer sample are arranged between the upper electrode and the lower electrode, the upper layer sample is attached above the lower layer sample, and the lower layer sample is attached to the lower electrode; the lower electrode is connected with the other end of the power supply;
the multi-foot connecting piece is arranged between the upper electrode and the upper layer sample, the upper part of the multi-foot connecting piece is abutted to the upper electrode, and the foot part of the multi-foot connecting piece is abutted to the upper layer sample.
Further, the multi-legged connector includes: a connector base and connector feet;
the connecting piece base body and the connecting piece feet are made of the same material, and the connecting piece feet are fixedly connected with the lower end of the connecting piece base body;
the length of the connecting element foot is greater than the thickness of the upper pattern.
Further, the number of the connecting piece feet is more than or equal to two.
Further, the connecting pieces are provided with a central shaft of the connecting piece base body in a symmetrical distribution.
Further, the connecting piece base body is a circular sheet with the radius of R;
the width of the connecting piece foot is w, the distance from the center of the connecting piece foot to the central axis of the connecting piece base body is R, and the requirement of (2R-w) > 0.6R is met.
Furthermore, the melting point of the connecting piece base body and the connecting piece foot is higher than that of the upper layer pattern; the melting point of the lower layer sample is higher than that of the upper layer sample.
Further, the method also comprises the following steps: a first conductor and a second conductor; one end of the power supply is connected with the upper electrode through the first conductor; the other end of the power supply is connected with the lower electrode through the second conductor.
One or more technical schemes provided by the embodiment of the invention at least have the following beneficial effects or advantages:
according to the heterogeneous material connecting device based on the multi-foot connecting piece, the upper layer sample and the lower layer sample are arranged between the upper electrode and the lower electrode, the upper layer sample is attached to the upper portion of the lower layer sample, and the lower layer sample is attached to the lower electrode; the lower electrode is connected with the other end of the power supply; the multi-foot connecting piece is arranged between the upper electrode and the upper layer sample, the upper part of the multi-foot connecting piece is abutted to the upper electrode, and the foot part of the multi-foot connecting piece is abutted to the upper layer sample. The foot of the multi-foot connector passes through the upper layer sample and contacts the lower layer sample after being heated, and finally a welding core is formed between the foot of the multi-foot connector and the lower layer sample. The dissimilar material connecting device based on the multi-foot connecting piece can realize resistance spot welding connection of dissimilar materials, and solves the problems that the different materials have large physical and chemical characteristic difference and are easy to generate chemical reaction to generate brittle phases, so that the connection strength is insufficient; the multi-legged connector can remarkably improve the positive pulling performance and the torsion resistance of the connector.
Drawings
Fig. 1 is a schematic structural diagram of a dissimilar material connection device based on a multi-foot connection member according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a multi-legged connector according to an embodiment of the present invention;
fig. 3 is a bottom view of fig. 2.
Detailed Description
The embodiment of the invention provides a dissimilar material connecting device based on a multi-foot connecting piece, and solves the technical problems that dissimilar materials are difficult to weld and welding quality is poor in the prior art.
Referring to fig. 1, an embodiment of the present invention provides a dissimilar material welding apparatus based on a multi-legged connector, including: the device comprises a power supply 1, an upper electrode 3, a multi-pin connecting piece, an upper layer sample 5, a lower layer sample 6 and a lower electrode 7.
Wherein, one end of the power supply 1 is connected with the upper electrode 3, and the upper electrode 3 is arranged above the lower electrode 7; the upper layer sample 5 and the lower layer sample 6 are arranged between the upper electrode 3 and the lower electrode 7, the upper layer sample 5 is attached above the lower layer sample 6, and the lower layer sample 6 is attached to the lower electrode 7; the lower electrode 7 is connected to the other end of the power supply 1. Wherein, the multi-pin connecting piece, the upper layer sample 5 and the lower layer sample 6 are all made of conductive materials. In this example, a 1mm thick 5-series aluminum alloy was used for the upper layer sample, and a 1mm thick 22MnB5 was used for the lower layer sample 6.
The multi-foot connecting piece is arranged between the upper electrode 3 and the upper layer sample 5, the upper part of the multi-foot connecting piece is abutted to the upper electrode 3, and the foot part of the multi-foot connecting piece is abutted to the upper layer sample 5. The multi-foot connecting piece can effectively prevent the rotation of the upper layer sample 5 and the lower layer sample 6, so that the joint can bear larger torque; by increasing the effective area covered by the feet of the multi-foot connecting piece (namely the difference between the projection area of the base body of the connecting piece and the projection area of the feet of the connecting piece), the positive tensile strength of the joint can be effectively improved.
In one embodiment of the present invention, a multi-legged connector includes: a connector base 4 and a connector foot 9; the connecting piece base body 4 and the connecting piece feet 9 are made of the same material, and in the embodiment, the connecting piece base body 4 and the connecting piece feet 9 are made of carbon steel. The connecting piece foot 9 is fixedly connected with the lower end of the connecting piece base body 4. The length of the connector foot 9 is greater than the thickness of the upper pattern.
In one embodiment of the present invention, the number of connecting feet 9 is greater than or equal to two. In particular, the number of connecting feet 9 is two.
In one embodiment of the present invention, the connector feet 9 are symmetrically disposed about the central axis of the connector body 4.
In one embodiment of the present invention, referring to fig. 2 and 3, the connector base 4 is a circular sheet with a radius R. The width of the connecting piece foot 9 is w, the distance from the center of the connecting piece foot 9 to the central axis of the connecting piece base body 4 is R, and (2R-w) > 0.6R is met, so that the best welding quality is achieved.
Specifically, referring to fig. 1-3, the connector base 4 is a cylinder with a radius R of 6mm and a thickness of 1 mm. The connector foot 9 is a cylinder with a radius of 1.5 mm. The included angle between the central line of the two connecting piece feet 9 and the central line of the connecting piece base body 4 is 180 degrees, the distance R between the central line of the connecting piece feet 9 and the central axis of the connecting piece base body 4 is 4.5mm, and the requirement of (2 x R-w) >0.6 x R is met; the length L of the connecting piece foot 9 is 1.3 mm.
In one embodiment of the present invention, the melting point of the connecting member base 4 and the connecting member legs 9 is higher than that of the upper pattern; the melting point of the lower layer sample 6 was higher than that of the upper layer sample 5. In the welding process, after electrification, the upper layer sample 5 is melted or softened, the connecting piece feet 9 penetrate through the upper layer sample 5 under the action of pressure to be abutted against the lower layer sample 6, and a welding core is formed between the connecting piece feet 9 and the lower layer sample 6.
In a specific embodiment of the present invention, the heterogeneous material connection device based on the multi-legged connection member further includes: a first conductor 2 and a second conductor 8; one end of a power supply 1 is connected with the upper electrode 3 through a first conductor 2; the other end of the power supply 1 is connected to the lower electrode 7 through a second conductor 8.
The welding process of the dissimilar material connecting device based on the multi-foot connecting piece provided by the embodiment of the invention is as follows: referring to fig. 1, one or both of the upper electrode 3 and the lower electrode 7 are moved so that the upper electrode 3 is in contact with the connector base 4 and the lower electrode 7 is in contact with the lower sample 6, and a pressure N is applied between the upper electrode 3 and the lower electrode 7. An auxiliary current I is input between the upper electrode 3 and the lower electrode 7 from a power supply 1 through a first conductor 2 and a second conductor 80Auxiliary current hold time T0The upper layer sample 5 is softened or melted under the action of the current, and the connecting piece foot 9 passes through the upper layer sample 5 to be in contact with the lower layer sample 6 under the action of the pressure N. A welding current I is input between an upper electrode 3 and a lower electrode 7 through a first conductor 2 and a second conductor 8 by a power supply 1, the welding current is maintained for a time T, and a connecting piece foot 9 is welded with a lower layer sample 6 under the action of the current to form a welding core. The output current is stopped and the pressure between the upper electrode 3 and the lower electrode 7 is maintained. And lifting the upper electrode 3 and the lower electrode 7 to complete a welding process.
The connecting piece foot 9 and the lower layer sample 6 are subjected to resistance spot welding, and the strength of the obtained welding spot is F13And performing resistance spot welding on the upper layer sample 5 and the lower layer sample 6 to obtain a welding spot joint with the strength of F23Satisfy F13>F23(ii) a Namely, the resistance spot welding performance of the connecting piece foot 9 and the lower layer sample 6 is better than that of the upper layer sample 5 and the lower layer sample 6.
In the examples of the present invention, only I is used0I denotes the auxiliary current and the welding current, without limiting I0I is a constant value. I.e. auxiliary current I0The form of the welding current I includes, but is not limited to, the following types: direct current, alternating current, pulsed current, gradually increasing current, gradually decreasing current, current of different waveforms, and the like. In the embodiment of the invention, the pressure in the connection process is only represented by N, and the value of N can be changed in different stages of connection. In the embodiment of the invention, the selection of the process parameters and the upper layerThe materials of the sample 5, the lower sample 6, and the connector base 4 and the connector foot 9 are closely related to the thickness. The process parameters for the materials and specifications of this example are shown in the following table:
TABLE 1
One or more technical schemes provided by the invention at least have the following beneficial effects or advantages:
referring to fig. 1, in the heterogeneous material connection device based on the multi-pin connection member according to the embodiment of the present invention, an upper layer sample 5 and a lower layer sample 6 are disposed between an upper electrode 3 and a lower electrode 7, the upper layer sample 5 is attached above the lower layer sample 6, and the lower layer sample 6 is attached to the lower electrode 7; the lower electrode 7 is connected with the other end of the power supply 1; the multi-foot connecting piece is arranged between the upper electrode 3 and the upper layer sample 5, the upper part of the multi-foot connecting piece is abutted to the upper electrode 3, and the foot part of the multi-foot connecting piece is abutted to the upper layer sample 5. The foot of the multi-pin connector, after heating, passed through the upper test specimen 5 and contacted the lower test specimen 6, and finally a nugget was formed between the foot of the multi-pin connector and the lower test specimen 6. The dissimilar material connecting device based on the multi-foot connecting piece can realize resistance spot welding connection of dissimilar materials, and solves the problems that the different materials have large physical and chemical characteristic difference and are easy to generate chemical reaction to generate brittle phases, so that the connection strength is insufficient; the multi-legged connector can remarkably improve the positive pulling performance and the torsion resistance of the connector.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. A dissimilar material welding device based on a multi-foot connector is characterized by comprising: the device comprises a power supply, an upper electrode, a multi-foot connecting piece, an upper layer sample, a lower layer sample and a lower electrode;
one end of the power supply is connected with the upper electrode, and the upper electrode is arranged above the lower electrode; the upper layer sample and the lower layer sample are arranged between the upper electrode and the lower electrode, the upper layer sample is attached above the lower layer sample, and the lower layer sample is attached to the lower electrode; the lower electrode is connected with the other end of the power supply;
the multi-foot connecting piece is arranged between the upper electrode and the upper layer sample, the upper part of the multi-foot connecting piece is abutted against the upper electrode, and the foot part of the multi-foot connecting piece is abutted against the upper layer sample; the multi-legged connector includes: a connector base and connector feet; the connecting piece base body and the connecting piece feet are made of the same material, and the connecting piece feet are fixedly connected with the lower end of the connecting piece base body; the connecting piece base body is a circular thin sheet; the number of the connecting piece feet is more than or equal to two; the connecting piece foot is a cylinder.
2. The dissimilar material welding apparatus based on a multi-footed connector as recited in claim 1, wherein the multi-footed connector comprises: the length of the connecting piece foot is larger than the thickness of the upper layer pattern.
3. The device for welding dissimilar materials based on a multi-legged connection according to claim 2, wherein the connection is symmetrical with respect to the central axis of the connection base.
4. The dissimilar material welding device based on a multi-legged connector according to claim 1, wherein the connector base is a circular thin plate with radius R;
the width of the connecting piece foot is w, the distance from the center of the connecting piece foot to the central axis of the connecting piece base body is R, and the requirement of (2R-w) > 0.6R is met.
5. The dissimilar material welding device based on a multi-legged connection member according to any one of claims 2 to 4, wherein the melting point of the connection member base and the connection member legs is higher than the melting point of the upper pattern;
the melting point of the lower layer sample is higher than that of the upper layer sample.
6. The device for welding dissimilar materials based on a multi-legged connection according to claim 1, further comprising: a first conductor and a second conductor;
one end of the power supply is connected with the upper electrode through the first conductor; the other end of the power supply is connected with the lower electrode through the second conductor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810875812.9A CN109048013B (en) | 2018-08-03 | 2018-08-03 | Dissimilar material connecting device based on multi-foot connecting piece |
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| CN201810875812.9A CN109048013B (en) | 2018-08-03 | 2018-08-03 | Dissimilar material connecting device based on multi-foot connecting piece |
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| CN109048013A CN109048013A (en) | 2018-12-21 |
| CN109048013B true CN109048013B (en) | 2021-08-17 |
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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 |
| CN101890564A (en) * | 2010-07-06 | 2010-11-24 | 上海交通大学 | Special metal resistance rivet welding device |
| CN106163721A (en) * | 2014-02-03 | 2016-11-23 | 美铝公司 | Resistance welding fastener, apparatus and method |
| CN106425068A (en) * | 2015-08-10 | 2017-02-22 | 福特汽车公司 | Method and system for enhancing rivetability |
| JP2017114055A (en) * | 2015-12-25 | 2017-06-29 | 株式会社神戸製鋼所 | Dissimilar material joint structure |
| CN107824951A (en) * | 2016-09-16 | 2018-03-23 | 本田技研工业株式会社 | Foreign material conjugant and method for joining members of different kinds |
| CN107900503A (en) * | 2017-10-10 | 2018-04-13 | 首钢集团有限公司 | A kind of dissimilar material joining device based on auxiliary sample |
-
2018
- 2018-08-03 CN CN201810875812.9A patent/CN109048013B/en active Active
Patent Citations (7)
| 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 |
| CN101890564A (en) * | 2010-07-06 | 2010-11-24 | 上海交通大学 | Special metal resistance rivet welding device |
| CN106163721A (en) * | 2014-02-03 | 2016-11-23 | 美铝公司 | Resistance welding fastener, apparatus and method |
| CN106425068A (en) * | 2015-08-10 | 2017-02-22 | 福特汽车公司 | Method and system for enhancing rivetability |
| JP2017114055A (en) * | 2015-12-25 | 2017-06-29 | 株式会社神戸製鋼所 | Dissimilar material joint structure |
| CN107824951A (en) * | 2016-09-16 | 2018-03-23 | 本田技研工业株式会社 | Foreign material conjugant and method for joining members of different kinds |
| CN107900503A (en) * | 2017-10-10 | 2018-04-13 | 首钢集团有限公司 | A kind of dissimilar material joining device based on auxiliary sample |
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