[특허]Aluminum end caps ultrasonically welded to end of aluminum tube

The Boeing Company

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특허 상세정보

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Aluminum end caps ultrasonically welded to end of aluminum tube

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B23K-020/10
미국특허분류(USC)	228/110.1; 228/001.1; 228/124.6; 156/073.1; 156/580.1
출원번호	UP-0955134 (2004-09-30)
등록번호	US-7819302 (2010-11-15)
발명자 / 주소	Bolser, David R. Graff, Karl F. Trapp, Timothy J.
출원인 / 주소	The Boeing Company
대리인 / 주소	Ostrager Chong Flaherty & Broitman P.C.
인용정보	피인용 횟수 : 8 인용 특허 : 17

초록
▼

An aluminum tubular unit for long-term, leak-free storage of fluids is formed in which an aluminum cap is ultrasonically welded to an end of the aluminum tube. The ultrasonic weld is formed from a device capable of producing a torsional vibration pattern. The ultrasonic welding of the cap to the tube eliminates the use of seals and pins to seal the cap to the tube and further eliminates the need for having a hole in the cap to mechanically couple the respective end cap to the cylindrical tube. Furthermore, since ultrasonic welding does not generate significant heat, highly volatile and flammable fluids can be present within the tube when the caps are ultrasonically welded to the cylindrical body. In addition, one or more fins used may also be welded to the outside diameter of the cylindrical body using a related ultrasonic welding process.

대표
청구항
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What is claimed is: 1. A method for forming a substantially leak-tight aluminum tubular unit used for long-term storage of fluids, the method comprising: providing a hollow cylindrical tubular unit having a cylindrically shaped exterior, an end, and a hollow central region; providing an end cap having a cylindrically shaped inner region, a shoulder region, and a cylindrically shaped outer region, said cylindrically shaped outer region shaped substantially similar to said cylindrically shaped exterior of the hollow cylindrical tubular unit; introducing a cylindrically shaped inner region of the end cap within said hollow central region such that a shoulder region of the end cap abuts said end; introducing a quantity of a fluid into the hollow region of said tubular unit prior to sealingly coupling said end cap to said tube; ultrasonically forming a cylindrically shaped solid state weld directly between said end and said shoulder region to sealingly couple the end cap to the hollow cylindrical tubular unit; providing at least one fin; and ultrasonically welding said one of said at least one fin directly to said cylindrically shaped exterior, whereby as the ultrasonic welding does not generate significant heat highly volatile and flammable liquids can be present and as no significant heat buildup occurs, the melting temperature of the aluminum is not reached so that substantially no microstructural changes to the end cap, the tubular unit, the cylindrically shaped exterior and said fin occur. 2. The method of claim 1, wherein ultrasonically forming a cylindrically shaped weld comprises: providing an ultrasonic welding device capable of a torsional vibrational pattern; coupling said end cap and said hollow cylindrical tubular unit to said ultrasonic welding device; applying a desired static force from said ultrasonic welding device between said end and said shoulder region; introducing a torsional vibration pattern at a desired amplitude for a predetermined time from said ultrasonic welding device to said end and said shoulder region, said desired amplitude and said predetermined time being sufficient to create a circular solid-state weld across and directly between said end and said shoulder region whereby as the ultrasonic welding does not generate significant heat, highly volatile and flammable fluids can be present and as no significant heat buildup occurs, the melting temperature of the aluminum is not reached so that substantially no microstructural changes to said end and said shoulder region occur. 3. The method of claim 2, wherein providing an ultrasonic welder having a capable of a torsional vibration pattern comprises: providing at least two ultrasonic transducers capable of producing a linear vibrational pattern; coupling said at least two ultrasonic transducers to a horn, wherein said linear vibrational pattern is translated to a torsional vibrational pattern within said horn; and coupling a circular shaped closure plate to said horn, said circular shaped closure plate substantially matching the shape of said shoulder region and said end. 4. The method of claim 3, wherein coupling said end cap and said hollow cylindrical tubular unit to said ultrasonic welding device comprises: providing an anvil having a hollow region; introducing said tubular unit within said hollow region; introducing the cylindrically shaped inner region of the end cap within said hollow central region such that the shoulder region of the end cap abuts said end; and coupling said circular shaped closure plate to a back of said end cap at a desired static force such that said shoulder region substantially contacts said end, wherein said circular shaped closure plate is located directly opposite said shoulder region on said cylindrical outer shaped region. 5. The method of claim 1, further comprising introducing a fluid within said hollow central region prior to sealingly coupling said end cap to said tube. 6. The method of claim 2 further comprising: determining a rim thickness of said shoulder region; and determining said desired amplitude, said predetermined amount of time and said static pressure sufficient to create said circular weld pattern as a function of said rim thickness. 7. The method of claim 6, wherein said circular solid-state weld has a mechanical strength of at least one thousand pounds, said mechanical strength defined as the amount of force necessary to separate said end cap from said end. 8. The method of claim 1, wherein said circular solid-state weld forms the substantially leak-tight seal meeting a standard of less than about 5×107 atm-cc/s helium leakage. 9. The method of claim 1, wherein ultrasonically seam-welding said one of said at least one fin to said cylindrically shaped exterior comprises ultrasonically seam-welding a faying surface of said one of said at least one fin directly to said cylindrically shaped exterior. 10. The method of claim 9, wherein ultrasonically seam-welding said one of said at least one fin to said cylindrically shaped exterior comprises: introducing a steel mandrel within said hollow central region; clamping said hollow cylindrical tubular unit within a pair of anvils; clamping one of said at least one fin in a lateral drive welder; pressing said one of said at least one fin against a cylindrically shaped exterior at a desired force; activating said lateral device welder at a desired amplitude to produce a linear vibrational pattern, wherein said linear vibrational pattern and said static force are sufficient to form an ultrasonic seam-weld directly between said fin and said cylindrically shaped exterior. 11. The method of claim 1 wherein ultrasonically welding said at least one fin directly to said cylindrically shaped exterior comprises ultrasonically seam welding said one of said at least one fin to said cylindrically shaped exterior. 12. The method of claim 11, wherein ultrasonically seam welding said one of said at least one fin to said cylindrically shaped exterior comprises: bending one of said at least one fin at a 90 degree angle to form an abutting surface and an extending surface; coupling said abutting surface along the length of said cylindrically shaped exterior; coupling an ultrasonic welding device onto said abutting surface at a first force; and activating said ultrasonic welding device to produce a linear vibrational pattern of a first amplitude, wherein said first force and said first amplitude are sufficient to form an ultrasonic seam weld between said abutting surface and said cylindrically shaped exterior.

이 특허에 인용된 특허 (17)

이 특허를 인용한 특허 피인용횟수: 8

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Aluminum end caps ultrasonically welded to end of aluminum tube

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이 특허에 인용된 특허 (17)

이 특허를 인용한 특허 피인용횟수: 8

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Aluminum end caps ultrasonically welded to end of aluminum tube

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이 특허에 인용된 특허 (17)

이 특허를 인용한 특허 피인용횟수: 8

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