Patent ID: 8074356
Filing Date: 2011-12-13
Classification: B21D,B23K,Y10T

Abstract:
1. A method for manufacturing a tube and fin heat exchanger comprising the steps of: disposing a plurality of fins between a top end plate and a bottom end plate in a laminate arrangement, said laminate arrangement characterized by having an aperture formed therethrough; lacing an aluminum tube in said aperture through said laminate arrangement; applying a lubricant to the interior of said tube, said lubricant characterized by ashless combustion; expanding a diameter of said tube to create an interference-fit between said tube and said laminate arrangement; then pneumatically purging a portion of said lubricant from said interior of said tube; then burning-off a residual of said lubricant at a first end of said tube using an open flame locally directed approximately toward said first end; assembling a prefluxed braze ring and an aluminum fitting to said first end of said tube; and brazing said fitting to said first end of said tube by heating said first end of said tube in an uncontrolled atmosphere.