EP1233842A1 - Verfahren und vorrichtung zum flussmittelfreien löten mit reaktivgasangereicherten metallschmelzen - Google Patents
Verfahren und vorrichtung zum flussmittelfreien löten mit reaktivgasangereicherten metallschmelzenInfo
- Publication number
- EP1233842A1 EP1233842A1 EP00984980A EP00984980A EP1233842A1 EP 1233842 A1 EP1233842 A1 EP 1233842A1 EP 00984980 A EP00984980 A EP 00984980A EP 00984980 A EP00984980 A EP 00984980A EP 1233842 A1 EP1233842 A1 EP 1233842A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solder
- gas
- soldering
- hydrogen
- outlet opening
- 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.)
- Withdrawn
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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/203—Fluxing, i.e. applying flux onto surfaces
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
Definitions
- the reactive gas is expediently introduced into the solder by means of a gas electrode and the solder is heated above the intended soldering temperature at least in the region around a gas outlet opening of the gas electrode.
- a preferred temperature value is 300 ° C.
- the reactive gas escaping from the gas electrode but not dissolving in the solder and / or the reactive gas escaping from the wetted, cooling solder according to Sievert's law is used to generate a protective gas atmosphere.
- the protective gas enriched with reactive gas in this way is particularly well suited to prevent pre-oxidation and post-oxidation on the workpiece or the solder.
- the gas bubbles bubble against the force of gravity in the direction of the bath surface 8 and pass through a catalyst 9, which consists of palladium or platinum and whose task is to break down the hydrogen H 2 emerging in molecular form from the gas outlet opening 5 into the soluble atomic form Reinforce 2H.
- a catalyst 9 which consists of palladium or platinum and whose task is to break down the hydrogen H 2 emerging in molecular form from the gas outlet opening 5 into the soluble atomic form Reinforce 2H.
- the gas electrode 3 is surrounded on its front section, which includes the gas outlet opening, by an electrode housing 10, which is received on a holder 11 in the solder bath 2.
- the electrode housing 10 is dimensioned such that solder can flow through between the gas electrode 3 and the inner wall of the electrode housing 10.
- the electrode housing 10, which also serves to fasten the catalytic converter 9, is intended to supply the gas bubbling up from the gas outlet opening 5 or the frit 6 to the catalytic converter in order to achieve the most efficient possible solution of gas in the solder in the solder bath 2.
- gas flows out of the gas outlet opening 5 of the gas electrode 3 and is brought into the form of small gas bubbles 7 in the frit 6.
- the heater causes a convective flow of the solder in the electrode housing 10 from bottom to top, so that fresh, low-hydrogen solder is constantly flowing through the catalyst 9.
- a circulation system not shown here, ensures a homogeneous distribution of the dissolved hydrogen in the entire solder bath 2.
- the solder is shaped into a solder wave in the usual way, for example by means of pumps. After wetting the solder joint on the workpiece, it cools down quickly. As a result of Sievert's law, the previously dissolved hydrogen at least partially emerges from the solder and reduces the oxides that may be present on the workpiece or the surface of the solder.
- Part of the hydrogen flowing out of the gas electrode 3 is not dissolved in the solder of the solder bath 2. This undissolved hydrogen 14 bubbles to the solder bath surface 8, mixes with the protective gas atmosphere 15 above and there also has a reducing effect.
- the protective gas atmosphere 15, which consists predominantly of inert N 2 is not shown here by a Maintain solder bath on top of solder bath. Suitable soldering tunnels for this purpose are described, for example, in documents DE 197 49 187 A1, DE 197 49 186 A1 or 197 49 184 A1.
- the hydrogen content in the protective gas atmosphere should not exceed about 4% by volume, since otherwise there is a risk of explosion. For this reason, the hydrogen content in the protective gas atmosphere 15 is determined continuously or at predetermined time intervals, likewise not shown here. If a certain limit value is exceeded, the protective gas is pumped out of the soldering tunnel and low-hydrogen inert gas is supplied.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molten Solder (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19955659A DE19955659A1 (de) | 1999-11-19 | 1999-11-19 | Verfahren und Vorrichtung zum flussmittelfreien Löten mit reaktivgasangereicherten Metallschmelzen |
DE19955659 | 1999-11-19 | ||
PCT/EP2000/010993 WO2001038032A1 (de) | 1999-11-19 | 2000-11-08 | Verfahren und vorrichtung zum flussmittelfreien löten mit reaktivgasangereicherten metallschmelzen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1233842A1 true EP1233842A1 (de) | 2002-08-28 |
Family
ID=7929596
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00984980A Withdrawn EP1233842A1 (de) | 1999-11-19 | 2000-11-08 | Verfahren und vorrichtung zum flussmittelfreien löten mit reaktivgasangereicherten metallschmelzen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1233842A1 (de) |
DE (1) | DE19955659A1 (de) |
WO (1) | WO2001038032A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0045909A1 (de) * | 1980-08-01 | 1982-02-17 | Aiwa Co., Ltd. | Lötverfahren und -gerät |
EP0685287A1 (de) * | 1994-05-31 | 1995-12-06 | The Boc Group, Inc. | Wellenlötverfahren und -vorrichtung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4821947A (en) * | 1988-02-08 | 1989-04-18 | Union Carbide Corporation | Fluxless application of a metal-comprising coating |
US5205461A (en) * | 1988-07-29 | 1993-04-27 | International Business Machines Corporation | Method and apparatus for fluxless solder bonding |
JP3127023B2 (ja) * | 1991-12-16 | 2001-01-22 | 大阪酸素工業株式会社 | 不活性ガス発生装置を用いたはんだ付け方法 |
-
1999
- 1999-11-19 DE DE19955659A patent/DE19955659A1/de not_active Ceased
-
2000
- 2000-11-08 EP EP00984980A patent/EP1233842A1/de not_active Withdrawn
- 2000-11-08 WO PCT/EP2000/010993 patent/WO2001038032A1/de active Search and Examination
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0045909A1 (de) * | 1980-08-01 | 1982-02-17 | Aiwa Co., Ltd. | Lötverfahren und -gerät |
EP0685287A1 (de) * | 1994-05-31 | 1995-12-06 | The Boc Group, Inc. | Wellenlötverfahren und -vorrichtung |
Non-Patent Citations (1)
Title |
---|
See also references of WO0138032A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19955659A1 (de) | 2001-05-31 |
WO2001038032A1 (de) | 2001-05-31 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
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AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: MESSER GRIESHEIM GMBH |
|
17P | Request for examination filed |
Effective date: 20020619 |
|
17Q | First examination report despatched |
Effective date: 20050303 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: AIR LIQUIDE DEUTSCHLAND GMBH |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20071220 |