CN100409991C - Welding wire and lead frame spot welding method - Google Patents
Welding wire and lead frame spot welding method Download PDFInfo
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- CN100409991C CN100409991C CNB2006100355343A CN200610035534A CN100409991C CN 100409991 C CN100409991 C CN 100409991C CN B2006100355343 A CNB2006100355343 A CN B2006100355343A CN 200610035534 A CN200610035534 A CN 200610035534A CN 100409991 C CN100409991 C CN 100409991C
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Abstract
The present invention discloses a spot welding method for a welding wire and a down-lead framework. A welding joint is used as one electrode, and the down-lead framework is used as the other electrode; the welding joint electrode and the electrode connected to the end of the down-lead framework are electrified, so current forms nuggets among the wire, a down-lead framework plating coat and a base body; subsequently, the welding joint electrode and the electrode connected to the end of the down-lead framework are switched off, and weldments are cooled. The present invention can increase welding strength and welding quality.
Description
Technical field
The present invention relates to a kind of welding method, the spot welding method of some metal thin materials such as particularly a kind of welding wire and lead frame.
Background technology
Welding is the process of a kind of necessity in the modern mechanical manufacturing industry, and is along with miniaturization, microminiaturization and the high performance of electronic product, just more and more higher to the requirement of welding procedure.In the manufacturing of electronics, microelectronic component, how the short pin of components and parts, thin wire are welded, and weld firm, solder joint is tiny, thereby form less impedance, to setting up the influence of advanced electronic system reliably greatly.
Now output and the principle Analysis to the sweating heat of present spot welding method is as follows, according to following formula:
Q＝I
2Rt(J)
In the formula: the heat of Q-generation (J);
I---welding current (A);
R---resistance between electrode (Ω);
T---weld interval (s);
Wherein, resistance between electrode comprises the resistance R w of workpiece own, and two workpiece get an electric shock indirectly and hinder Rc, and electrode and workpiece get an electric shock indirectly and hinder Rew.Be R=2Rw+Rc+2Rew.
When workpiece and electrode one timing, the resistance of workpiece depends on its resistivity.Therefore, resistivity is the important performance of weldment, and it depends on the surface contacted resistance between metal species, electrode and workpiece, workpiece and the workpiece.Aspect metal species, the metal of poorly conductive (as: stainless steel) resistivity height, the metal of good conductivity (as: aluminium alloy) resistivity is low, therefore, during the spot welding stainless steel heat production easily and heat radiation is difficult, the difficult and heat radiation of heat production is easily during the spot welding aluminium alloy.Aspect the surface contacted resistance of workpiece and workpiece, during the different weldment of two thickness of spot welding,, produce more heat because thick internal resistance is bigger; And thin part internal resistance is less, produces less heat, and the result makes thick of nugget deflection.When the thickness difference of two weldments is bigger, then deflection is also bigger, even makes nugget all in thick, thereby makes welding entirely ineffective.
At present,, utilize the most advanced and sophisticated heat that produces of soldering tip, finish paint removal, welding simultaneously by in the spot welding of electron trade.
When using spot-welded on wire rod and lead frame, there is following defective:
(1). because to the wire rod paint removal be welded on same sequential and finish, process time is short, can only finish solder between wire rod and lead frame coating and connect, nugget can not be in the formation of lead frame basic unit, and weld strength is not enough;
(2). wire rod coat of paint and lead frame coating material, thickness influence greatly the welding effect of weldment, and to the dependence height of lead frame thickness of coating, when the thickness of coating deviation was big, wire rod and lead frame welding difficulty were big, even do not weld at all;
(3). the diameter and the leadframe thickness of wire rod are inconsistent, and contact surface is long-pending inconsistent, and nugget is partial to thick as a result, cause the welding of lead frame and wire rod difficult, even do not weld;
(4). when welding, the lead frame of good conductivity dispels the heat easily, the heat production difficulty, solderability is poor, and current sinking is big;
(5). wire surface has insulating barrier, and the high temperature that influences soldering tip forms nugget between the two at wire rod and lead frame.
Summary of the invention
The objective of the invention is to provide and a kind ofly can improve the wire rod of weld strength and welding quality and the spot welding method of lead frame.
Purpose of the present invention can realize by following technical measures: the spot welding method of a kind of welding wire and lead frame, with soldering tip as a utmost point, lead frame is as another utmost point, butt welding tip electrode and be connected the electrifying electrodes of lead frame frame end makes electric current form nugget between wire rod and lead frame coating, matrix three; Then butt welding tip electrode and the electrode outage that is connected the lead frame frame end cool off weldment.
The present invention is at the soldering tip electrode with before being connected the electrifying electrodes of lead frame frame end, and first butt welding tip electrode internal heat generation resistance energising makes the soldering tip preheating; Descend then soldering tip with place that the wire rod of weld touches on the lead frame, wire rod is carried out surface paint removal; After the wire rod paint removal, stop the energising of soldering tip internal heat generation resistance.
The present invention is stopping after the heating resistor power supply of soldering tip inside, and soldering tip continues roof pressure on the wire rod of weld, makes soldering tip continue to keep to the pressure of weldment, is beneficial to form nugget.
The present invention controls welding temperature between wire rod and lead frame by the size of control electric current, wire rod, lead frame coating, the lead frame matrix of electric current after soldering tip, paint removal forms the loop, be that the wire rod of electric current after by paint removal flow to lead frame, make big electric current between wire rod and lead frame coating and matrix, form nugget, thereby be implemented in the new metallic crystal of formation between weldment.
The present invention is no longer led to big electric current between described wire rod and lead frame coating and matrix after forming nugget between weldment; The weldment that has welded carries out the nature cooling in air, soldering tip continues roof pressure on the nugget that weld forms, and up to the weldment cooling, is solidified to sufficient intensity to guarantee weldment.
Compared with prior art, beneficial effect of the present invention is as follows:
(1) method of welding wire of the present invention and lead frame owing to paint removal and welding are finished step by step, thereby has reduced the influence of coat of paint to welding effect;
(2) nugget forms between wire rod and lead frame coating and matrix, has reduced the dependency degree of weldment to thickness of coating, drops to the influence of the artificial uncontrollable factor in the welding processes such as metal layer thickness, supplied materials error minimum;
(3) nugget forms between wire rod and lead frame coating and matrix, has more effectively guaranteed wire rod and lead frame welding reliability and stability;
(4) soldering tip and lead frame are all electrode, and be inconsistent in the diameter and the leadframe thickness of wire rod, when the long-pending inconsistent weldment of contact surface welds, there is not hot problem of transmission, solved nugget and be partial to thick, and lead frame that causes and wire rod welding are difficult, even the problem of not welding;
(5) soldering tip and lead frame are all electrode, do not have hot problem of transmission, when having solved the metal solder of good conductivity heat radiation easily, the heat production difficulty, solderability is poor, and the big problem of current sinking, has improved the solderability of the metal of resistivity low (good conductivity) widely.
Description of drawings
Fig. 1 is the process principle simplified schematic diagram of invention;
Fig. 2 is an operation principle flow chart of the present invention;
The schematic diagram in Fig. 3 precompressed stage of the present invention;
Fig. 4 is a first step preheating step schematic diagram of the present invention;
Fig. 5 is a paint removal step schematic diagram of the present invention;
Fig. 6 is the schematic diagram in welding stage of the present invention;
Fig. 7 is the schematic diagram of outage cooling of the present invention;
Fig. 8 is the schematic diagram that returns the stage of the present invention.
The specific embodiment
The specific embodiment of the method for a kind of welding wire of the present invention and lead frame is shown in Fig. 1～8, and it comprises following concrete steps:
(1). the precompressed stage: electrode is prepared to descend, and the energising of soldering tip 1 electrode internal heat generation resistance produces heat, and soldering tip is preheating to the temperature of fusible insulated paint, for the insulated paint of removing on the wire rod 2 is prepared;
(2). paint removal: soldering tip 1 descends fast, and touches with wire rod 2, utilizes the heat that impulse force that soldering tip 1 descends fast and heating resistor produce and removes the insulated paint of wire rod weld;
(3). electrode conversion: stop the heating resistor power supply to soldering tip 1 inside, the pressure of 1 pair of weldment of soldering tip continues to keep simultaneously, and as a utmost point, lead frame is as another utmost point with soldering tip, butt welding tip electrode and be connected the electrifying electrodes of lead frame frame end;
(4). welding: wire rod 2, lead frame coating 31, the lead frame matrix 32 of electric current after soldering tip 1, paint removal forms the loop, be that the wire rod 2 of electric current after by paint removal flow to lead frame 3, control the welding temperature of 3 of wire rod 2 and lead frames by the size of control electric current, make big electric current between wire rod 2 and lead frame coating 31 and matrix, form nugget 4, thereby be implemented in the new metallic crystal of formation between weldment.
(5). outage cooling: to soldering tip 1 electrode and the electrode outage that is connected lead frame 3 ends, the weldment that has welded carries out the nature cooling in air, soldering tip continues roof pressure on the nugget that weld forms, and up to the weldment cooling, is solidified to sufficient intensity to guarantee weldment.
(6). return: soldering tip 1 rises, and returns initial position, and soldering tip 1 electrode is ready for descending once more, begins the welding processing of weldment next time.
Claims (4)
1. the spot welding method of welding wire and lead frame, it is characterized in that: with soldering tip as a utmost point, lead frame is as another utmost point, and butt welding tip electrode and be connected the electrifying electrodes of lead frame frame end makes electric current form nugget between wire rod and lead frame coating, matrix three; Then butt welding tip electrode and the electrode outage that is connected the lead frame frame end cool off weldment;
Above-mentioned in soldering tip electrode and the following processing of electrifying electrodes previous crops that is connected the lead frame frame end: first butt welding tip electrode internal heat generation resistance energising makes the soldering tip preheating; Descend then soldering tip with place that the wire rod of weld touches on the lead frame, wire rod is carried out surface paint removal; After the wire rod paint removal, stop the energising of soldering tip internal heat generation resistance.
2. the spot welding method of welding wire according to claim 1 and lead frame is characterized in that stopping after the heating resistor power supply of soldering tip inside, and soldering tip continues roof pressure on the wire rod of weld.
3. the spot welding method of welding wire according to claim 1 and lead frame is characterized in that controlling welding temperature between wire rod and lead frame by the size of control electric current.
4. the spot welding method of welding wire according to claim 1 and lead frame, it is characterized in that after forming nugget between weldment, the weldment that has welded carries out the nature cooling in air, soldering tip continues roof pressure on the nugget that weld forms, and cools off up to weldment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100355343A CN100409991C (en) | 2006-05-19 | 2006-05-19 | Welding wire and lead frame spot welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100355343A CN100409991C (en) | 2006-05-19 | 2006-05-19 | Welding wire and lead frame spot welding method |
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| Publication Number | Publication Date |
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| CN1850415A CN1850415A (en) | 2006-10-25 |
| CN100409991C true CN100409991C (en) | 2008-08-13 |
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| CNB2006100355343A Active CN100409991C (en) | 2006-05-19 | 2006-05-19 | Welding wire and lead frame spot welding method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102049580B (en) * | 2010-09-26 | 2013-04-24 | 广州金升阳科技有限公司 | Welding method of lead frame |
| JP7127486B2 (en) * | 2018-10-31 | 2022-08-30 | トヨタ自動車株式会社 | Dissimilar material joining method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4835356A (en) * | 1987-03-23 | 1989-05-30 | Yugen Kaisha Shinwa Kogyo | Spot welding machine |
| US5587091A (en) * | 1994-04-20 | 1996-12-24 | Nippondenso Co., Ltd. | Method and apparatus for controlling resistance welding |
| JP2002358831A (en) * | 2001-05-31 | 2002-12-13 | Hitachi Cable Ltd | Connection part of bending resistant cable |
| CN1132714C (en) * | 2001-06-07 | 2003-12-31 | 杨仕桐 | Spot welder capable of welding lacquered wire directly |
| CN2765707Y (en) * | 2004-12-27 | 2006-03-22 | 浙江卧龙科技股份有限公司 | Pressure closed-loop control device for spot welding machine |
-
2006
- 2006-05-19 CN CNB2006100355343A patent/CN100409991C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4835356A (en) * | 1987-03-23 | 1989-05-30 | Yugen Kaisha Shinwa Kogyo | Spot welding machine |
| US5587091A (en) * | 1994-04-20 | 1996-12-24 | Nippondenso Co., Ltd. | Method and apparatus for controlling resistance welding |
| JP2002358831A (en) * | 2001-05-31 | 2002-12-13 | Hitachi Cable Ltd | Connection part of bending resistant cable |
| CN1132714C (en) * | 2001-06-07 | 2003-12-31 | 杨仕桐 | Spot welder capable of welding lacquered wire directly |
| CN2765707Y (en) * | 2004-12-27 | 2006-03-22 | 浙江卧龙科技股份有限公司 | Pressure closed-loop control device for spot welding machine |
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| CN1850415A (en) | 2006-10-25 |
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Address after: 510663 Guangzhou Science City, Luogang District science Avenue, science and technology development center, Department of the Department of the 1st Street, No. 5 Patentee after: Guangzhou Jinshengyang Science & Technology Co., Ltd. Address before: 510660, 2 floor, 6 Industrial Park, Huang Yi Road, Guangzhou, Guangdong, Tianhe District Patentee before: Guangzhou Jinshengyang Science & Technology Co., Ltd. |