[특허]System and method of brazing using non-silver metals

[미국특허] System and method of brazing using non-silver metals 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B23K-013/01
출원번호	US-0523112 (2007-12-11)
등록번호	US-8507833 (2013-08-13)
국제출원번호	PCT/US2007/025309 (2007-12-11)
§371/§102 date	20091027 (20091027)
국제공개번호	WO2008/073419 (2008-06-19)
발명자 / 주소	Belohlav, Alan
출원인 / 주소	Lucas-Milhaupt, Inc.
대리인 / 주소	Boyle Fredrickson, S.C.
인용정보	피인용 횟수 : 2 인용 특허 : 71

초록 ▼

Systems and methods for brazing and soldering using low and non-silver based filler metals are described. The present invention includes methods and systems for brazing and soldering using copper based or bronze type filler metals in lieu of silver containing filler metals. The systems and methods provide advantages in that the bronze filler metals are substantially cheaper than silver alloy filler metals that are commonly used. Furthermore, the present invention uses a low-temperature, water-soluble flux that provides for easier cleanup after the completion of the brazing process. Additionally, the present invention provides significant advantages over traditional copper brazing in that it allows for a one-piece workflow and eliminates the need for large component pieces and filler metal inventories. This results in a significant decrease in capital expenditures and utility costs. Finally, the method described results in a significant decrease in the amount of equipment maintenance and capital investment that is necessary.

대표청구항 ▼

1. A method of joining using filler metals to form a joint between at least two base metals comprising the steps of: a. preparing at least two base metals to be joined;b. providing a high temperature filler metal that is suitable for high temperature joining at temperatures greater than 840 degrees Fahrenheit;c. providing a low temperature flux material that is designed for low temperature joining;d. applying a shielding gas as a barrier to the ambient;e. heating a joint portion of the base metals with a rapid heating cycle; andf. joining the at least two base metals with a high temperature brazing technique using the high temperature filler material and low temperature flux material to form the joint. 2. The method of claim 1 wherein quenching the base metals in hot water of 120 degrees Fahrenheit or greater removes excess flux from the base metals. 3. The method of claim 1 wherein the flux material is a post-braze water soluble flux. 4. The method of claim 1 wherein the filler metal is at least one of: a CDA 680 alloy and a CDA 681 alloy. 5. The method of claim 1 wherein the filler metal is provided as a continuous length of wire. 6. The method of claim 5 wherein the wire is a flux cored wire. 7. The method of claim 6 wherein the flux cored wire includes a post-braze water soluble flux material. 8. The method of claim 1 wherein the filler metal is provided as a preformed geometric shape. 9. The method of claim 8 wherein the preformed geometric shape is a circle. 10. The method of claim 8 wherein the preformed geometric shape is an oval. 11. The method of claim 8 wherein the preformed geometric shape is polygonal. 12. The method of claim 1 wherein the heating of the base metals is done by way of an inductive heating technique. 13. The method of claim 1 wherein the base metals are heated to a temperature that is adequate to melt and flow the filler metal, and low enough to prevent melting of the base metals. 14. The method of claim 1 wherein the filler metal is a bronze-based filler metal. 15. The method of claim 1 wherein the filler metal is a low silver filler metal. 16. The method of claim 15 wherein low silver filler metal has less than about 30 percent silver. 17. The method of claim 16 wherein the filler metal is a CDA 464 alloy. 18. The method of claim 15 wherein low silver filler metal has less than about 25 percent silver. 19. The method of claim 15 wherein low silver filler metal has no silver therein. 20. The method of claim 1 wherein the low temperature flux comprises at least one of: an elemental boron in an amount of 0.5% to 5%;an amphoteric surfactant including deriphat 160 in an amount of 0.3% to 5%;a potassium bifluoride in an amount of 30% to 45%;a boric acid in an amount of 25% to 40%;a potassium flouborate in an amount of 15% to 30%; anda potassium tetraborate in an amount of 5% to 10%. 21. A method of joining using filler metals to form a joint between at least two base metals comprising the steps of: a. preparing at least two base metals to be joined;b. a high temperature filler metal that is suitable for high temperature joining;c. fluxing the at least two base metals;d. heating the at least two base metals to a temperature which is less that required in welding processes defining a heat effected zone;e. purging ambient gasses adjacent the heat-affected zone by displacement using a shielding gas; andf. applying the high temperature filler metal to the heated base metals such that the filler metals are drawn into the area between the at least two base metals through capillary action to form a joint. 22. The method of claim 21 wherein the high temperature filler metal is at least one of: a CDA 680 alloy and a CDA 681 alloy.

이 특허에 인용된 특허 (71) 인용/피인용 타임라인 분석

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이 특허를 인용한 특허 (2) 인용/피인용 타임라인 분석

Campbell, Steven; Scott, John, Filler metal with flux for brazing and soldering and method of making and using same.
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Campbell, Steven, Filler metal with flux for brazing and soldering and method of using same.
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[미국특허] System and method of brazing using non-silver metals 원문보기

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