Laminate bonding method

B - Operations – Transporting – 23 – K

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13/1

B23K 20/227 (2006.01) B23K 20/00 (2006.01)

Patent

CA 1116818

D-3025 C-3122 Abstract of the Disclosure A method for manufacturing a composite sheet of material having a controlled porous characteristic and made up of two or more metal lamina bonded together, including the steps of forming first and second sheets of porous material with a first and second array of open- ings therein offset with respect to one another; stacking the first and second sheets together to form a pheripheral joint line therebetween having end edges indexed to align the first and second array of openings to form a coolant flow pattern through the stacked sheets; welding indexed end edges to fixedly connect the first and second sheets together; stretch-forming the stacked sheets by bending them under tension across a predetermined curvature on a form die to cause the first and second sheets to exceed their yield point to effect an intimate fit across juxta- posed surfaces thereon; thereafter further bending and restraining the welded end edges of the first and second sheets to produce a bond pressure between the sheets at the juxtaposed surfaces thereon and thereafter subjecting restrained and mechanically pressurized juxtaposed sur- faces between the first and second sheets to an elevated bonding temperature for a predetermined period of time to produce a diffusion bonded metal joint between the stacked sheets.

345964

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