DE19807696A1 - Method for dip soldering with improved protection of solder melts and solder points against oxidation - Google Patents
Method for dip soldering with improved protection of solder melts and solder points against oxidationInfo
- Publication number
- DE19807696A1 DE19807696A1 DE1998107696 DE19807696A DE19807696A1 DE 19807696 A1 DE19807696 A1 DE 19807696A1 DE 1998107696 DE1998107696 DE 1998107696 DE 19807696 A DE19807696 A DE 19807696A DE 19807696 A1 DE19807696 A1 DE 19807696A1
- Authority
- DE
- Germany
- Prior art keywords
- solder
- protective gas
- dip soldering
- soldering
- against oxidation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0646—Solder baths
- B23K3/0653—Solder baths with wave generating means, e.g. nozzles, jets, fountains
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Tauchlöten, bei dem eine Lotwelle erzeugt und von Schutzgas umströmt wird.The invention relates to a method for dip soldering, in which a solder wave is generated and inert gas flows around it.
Das Löten unter Luftabschluß in einer Umgebung ohne Sauer stoff, zur Vermeidung einer Oxidation der Lotschmelze, wird meistens in einer Atmosphäre aus Schutzgas oder im Vakuum durchgeführt. Durch die Vermeidung einer Oxidation der Lot schmelze wird die Benetzung der zu verbindenden Gegenstände verbessert, die Verbindung schneller und zuverlässiger herge stellt. Trotz dieser schon bekannten Maßnahmen zur Verhinde rung der Oxidation der Lotschmelze weisen die bisher bekannten Verfahren noch insofern ein Verbesserungspotential auf, als die Lötstelle selbst von einem Oxid überzogen sein kann, das das Lötergebnis beeinträchtigen kann.Soldering in the absence of air in an environment without acid material to avoid oxidation of the solder melt mostly in an atmosphere of inert gas or in a vacuum carried out. By avoiding oxidation of the solder the wetting of the objects to be joined will melt improved, the connection faster and more reliable poses. Despite these known measures to prevent tion of the oxidation of the solder melt have the previously known Process still has room for improvement insofar as the solder joint itself can be coated with an oxide that can affect the soldering result.
Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Verfah ren zum Tauchlöten dahingehend zu verbessern, daß das Problem der Oxidationsneigung von Lotschmelze und Lötstelle noch wei ter verringert wird. The invention is therefore based on the object of a method to improve dip soldering so that the problem the oxidation tendency of the solder melt and solder joint is still white ter is reduced.
Diese Aufgabe löst die Erfindung dadurch, daß das Schutzgas erhitzt wird und als Desoxidationsmittel eine Sauerstoffreduk tion in einer Lotschmelze und an der Lötstelle bewirkt. Durch diese weitere Vermeidung der Oxidation kann in den meisten Fällen auf sonst notwendige Flußmittel verzichtet werden. Die resultierenden Lötverbindungen sind sauber, frei von störenden Rückständen, die Verbindung bildet sich noch schneller und noch zuverlässiger. Die für dieses Verfahren notwendige Vor richtung kann vorzugsweise eine elektrisch beheizte Heizvor richtung aufweisen. Sie kann das Schutzgas auf Temperaturen bis zu 600°C erhitzen. Die Heizvorrichtung kann einen Wärme tauscher, vorzugsweise in Form einer elektrisch erhitzten Heizwendelanordnung, aufweisen, der zur Übertragung der vor zugsweise elektrisch erzeugten Wärme dient. Das Schutzgas wird aus einem Vorratsbehälter durch den Wärmetauscher hindurch geführt und steht vorzugsweise mit einem Druck von 1-5 bar und einer Temperatur von mindestens 300°C für den Lötprozeß zur Verfügung. Die Tauchlötvorrichtung kann ein Gehäuse auf weisen, das die Heizvorrichtung umschließt. Aus Gründen der Widerstandsfähigkeit gegen Chemikalien, der leichten Pflege und der optischen Gefälligkeit kann dieses Gehäuse vorzugs weise aus Edelstahl bestehen. Das Schutzgas kann N2H2 als Kom ponente aufweisen. Diese Komponente bewirkt besonders gute Ergebnisse bei der Reduktion von Metalloxid.This problem is solved by the invention in that the protective gas is heated and as a deoxidizing agent causes an oxygen reduction in a solder melt and at the solder joint. This further avoidance of oxidation means that in most cases fluxes that are otherwise necessary can be dispensed with. The resulting soldered connections are clean, free from annoying residues, the connection is formed even faster and more reliably. The direction required for this method can preferably have an electrically heated Heizvor direction. It can heat the protective gas to temperatures up to 600 ° C. The heating device can have a heat exchanger, preferably in the form of an electrically heated heating coil arrangement, which serves to transfer the heat which is preferably generated electrically before. The protective gas is passed from a storage container through the heat exchanger and is preferably available at a pressure of 1-5 bar and a temperature of at least 300 ° C for the soldering process. The dip soldering device can have a housing that encloses the heating device. For reasons of resistance to chemicals, easy maintenance and visual comfort, this housing can be made of stainless steel. The protective gas can have N 2 H 2 as a component. This component produces particularly good results in the reduction of metal oxide.
Nachfolgend wird ein Ausführungsbeispiel einer erfindungsgemä ßen Tauchlötvorrichtung anhand der beiliegenden Zeichnung näher erläutert.An exemplary embodiment of a device according to the invention is described below plunge soldering device using the attached drawing explained in more detail.
Die einzige Figur zeigt eine Schnittansicht durch die Tauch lötvorrichtung. Ein Gehäuse 10, das vorzugsweise aus Edelstahl besteht, umschließt eine Heizvorrichtung 11 zur Schutzgaser hitzung. Die Heizvorrichtung 11 enthält eine vorzugsweise elektrisch erhitzte Heizwendelanordnung 12. Diese Heizwendel anordnung 12 wird von einem an einem Eintritt 13 einströmenden Schutzgas 20 umströmt und dadurch auf mindestens 300°C er hitzt. Die Heizwendelanordnung 12 erfüllt damit die Aufgabe eines Wärmetauschers. In die Heizvorrichtung 11 ist ein Ther moelement 14 eingebracht, mit dessen Hilfe die Betriebstempe ratur überwacht werden kann. Nach Verlassen der Heizvorrich tung 11 strömt das Schutzgas 20 in eine Lotdüse 15, an deren Öffnung 18 eine Lotschmelze 16 eine Lotwelle 19 ausbildet. In der Lotdüse 15 umströmt das Schutzgas 20 die zwischen der Düse 15 und einem hier nicht näher dargestellten Lottank zir kulierende Lotschmelze 16. Durch die räumlich dichte Umströ mung der Lotschmelze 16 und einer Lötstelle 17 durch das Schutzgas 20 vermindert das Schutzgas 20 eine Oxidation von Lotschmelzenoberfläche 16 und Lötstelle 17. Beim Strömen des Schutzgases 20 an der Lotschmelze 16 und der Lötstelle 17 vorbei läuft zwischen vorhandenen Metalloxiden und dem N2H2 des Schutzgases 20 eine chemische Reaktion ab, wodurch das Metall oxid reduziert wird und Wasserdampf und Stickstoff entstehen.The single figure shows a sectional view through the immersion soldering device. A housing 10 , which is preferably made of stainless steel, encloses a heating device 11 for protective gas heating. The heating device 11 contains a preferably electrically heated heating coil arrangement 12 . This heating coil arrangement 12 is flowed around by a protective gas 20 flowing in at an inlet 13, thereby heating it to at least 300 ° C. The heating coil arrangement 12 thus fulfills the task of a heat exchanger. In the heating device 11 , a thermocouple 14 is introduced, by means of which the operating temperature can be monitored. After leaving the Heizvorrich device 11 , the protective gas 20 flows into a solder nozzle 15 , at the opening 18, a solder melt 16 forms a solder wave 19 . In the solder nozzle 15, the protective gas 20 flows around the solder melt 16 circulating between the nozzle 15 and a solder tank (not shown here). The spatially dense Umströ the molten solder 16 and a solder joint 17 mung through the protective gas, the protective gas 20 20 reduces oxidation of Lotschmelzenoberfläche 16 and solder joint 17th When the protective gas 20 flows past the solder melt 16 and the solder joint 17 , a chemical reaction takes place between existing metal oxides and the N 2 H 2 of the protective gas 20, as a result of which the metal oxide is reduced and water vapor and nitrogen are formed.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998107696 DE19807696C2 (en) | 1998-02-24 | 1998-02-24 | Dip soldering process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998107696 DE19807696C2 (en) | 1998-02-24 | 1998-02-24 | Dip soldering process |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19807696A1 true DE19807696A1 (en) | 1999-09-09 |
DE19807696C2 DE19807696C2 (en) | 2001-09-06 |
Family
ID=7858727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1998107696 Expired - Fee Related DE19807696C2 (en) | 1998-02-24 | 1998-02-24 | Dip soldering process |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19807696C2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6655574B2 (en) * | 2001-04-12 | 2003-12-02 | Vitronics Soltec B.V. | Apparatus for selective soldering |
NL1024476C2 (en) * | 2003-10-07 | 2005-04-08 | Vitronics Soltec B V | Device for selective soldering of components on a print plate with classical connecting wires includes means to blow oxygen on solder to make sure its flow in correct direction to prevent formation of bridges between connecting wires |
WO2005070603A1 (en) * | 2004-01-21 | 2005-08-04 | Siemens Aktiengesellschaft | Repair soldering head having a supply channel for a heat transfer medium and a return channel for said heat transfer medium, and the use thereof |
CN112404633A (en) * | 2019-08-21 | 2021-02-26 | 株式会社电装天 | Welding device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0440264A1 (en) * | 1987-11-05 | 1991-08-07 | Ernst Hohnerlein | Process and device for soldering under a protective gas |
DE4041272A1 (en) * | 1990-12-21 | 1992-06-25 | Siemens Ag | Wave-soldering apparatus - with reduction area produced by reducing flame by solder point to optimise soldering conditions |
EP0714721A2 (en) * | 1994-11-30 | 1996-06-05 | Electrovert Limited | Applying flux to a solder wave for wave soldering an element |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4538757A (en) * | 1983-08-01 | 1985-09-03 | Motorola, Inc. | Wave soldering in a reducing atmosphere |
US4995411A (en) * | 1988-10-07 | 1991-02-26 | Hollis Automation, Inc. | Mass soldering system providing an improved fluid blast |
US5090651A (en) * | 1990-01-31 | 1992-02-25 | Electrovert Ltd. | Gas curtain additives and zoned tunnel for soldering |
-
1998
- 1998-02-24 DE DE1998107696 patent/DE19807696C2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0440264A1 (en) * | 1987-11-05 | 1991-08-07 | Ernst Hohnerlein | Process and device for soldering under a protective gas |
DE4041272A1 (en) * | 1990-12-21 | 1992-06-25 | Siemens Ag | Wave-soldering apparatus - with reduction area produced by reducing flame by solder point to optimise soldering conditions |
EP0714721A2 (en) * | 1994-11-30 | 1996-06-05 | Electrovert Limited | Applying flux to a solder wave for wave soldering an element |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6655574B2 (en) * | 2001-04-12 | 2003-12-02 | Vitronics Soltec B.V. | Apparatus for selective soldering |
NL1024476C2 (en) * | 2003-10-07 | 2005-04-08 | Vitronics Soltec B V | Device for selective soldering of components on a print plate with classical connecting wires includes means to blow oxygen on solder to make sure its flow in correct direction to prevent formation of bridges between connecting wires |
WO2005070603A1 (en) * | 2004-01-21 | 2005-08-04 | Siemens Aktiengesellschaft | Repair soldering head having a supply channel for a heat transfer medium and a return channel for said heat transfer medium, and the use thereof |
CN112404633A (en) * | 2019-08-21 | 2021-02-26 | 株式会社电装天 | Welding device |
CN112404633B (en) * | 2019-08-21 | 2023-02-28 | 株式会社电装天 | Welding device |
Also Published As
Publication number | Publication date |
---|---|
DE19807696C2 (en) | 2001-09-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |