US9352412B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9352412-B2 |
| Application number | US-201414156923-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 16, 2014 |
| Priority date | Feb 6, 2013 |
| Publication date | May 31, 2016 |
| Grant date | May 31, 2016 |
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A method of forming a bonded assembly ( 10 ). The method comprises: providing at least first and second parts ( 12, 14 ) of an assembly ( 10 ) to be bonded; assembling the first and second parts ( 12, 14 ) in a required relative position to define a bond interface region therebetween; sealing part way along an edge ( 18 ) of the bond interface region using laser beam welding to define a cavity between the first and second parts ( 12, 14 ); in a vacuum environment, sealing the remainder of the edge ( 20 ) of the bond interface region using electron beam welding to form a fluid tight seal around the cavity; and applying heat and pressure to an external surface of the cavity to diffusion bond the first and second parts ( 12, 14 ) together.
Opening claim text (preview).
The invention claimed is: 1. A method of forming a bonded assembly, the method comprising: providing at least first and second parts of an assembly to be bonded; assembling the first and second parts in a required relative position to define a bond interface region therebetween; sealing part way along an edge of the bond interface region using laser beam welding to define a cavity between the first and second parts; in a vacuum environment, sealing the remainder of the edge of the bond interface region using electron beam welding to form a fluid tight seal around the cavity; and applying heat and pressure to an external surface of the cavity to diffusion bond the first and second parts together. 2. A method according to claim 1 , wherein the cavity is evacuated to form the vacuum environment prior to either the laser beam welding or the electron beam welding step. 3. A method according to claim 1 , wherein one or both of the laser welding and the electron beam welding comprises adding weld filler material to the edge of the bond interface region. 4. A method according to claim 1 , wherein one or both of the first and second parts comprises a non-porous material. 5. A method according to claim 1 , wherein the first and second parts comprise different materials. 6. A method according to claim 1 , wherein one or both of the first and second parts comprises a sacrificial tab which is provided at the edge of the bond interface region when the first and second parts are assembled. 7. A method according to claim 6 , comprising removing the tab subsequent to the application of heat and pressure to form the assembly. 8. A bonded assembly formed by the method of claim 1 .
in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding · CPC title
specially adapted for particular articles or work · CPC title
all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} · CPC title
within a vacuum chamber (B23K15/04 takes precedence) · CPC title
Isostatic pressure welding · CPC title
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