Patent ID: 7559454
Filing Date: 2009-07-14
Classification: B23K

Abstract:
1. A method of brazing a titanium metal within a heat exchanger comprising the steps of: coating a first braze material onto a multitude of portions of a base material, said first braze material being a mixture comprising 20-80 wt % Ti, 10-30 wt % Cu, 10-30 wt % Ni, 0-20 wt % PM, 0-20 wt % M and having a Ni/(Cu+PM) ratio between 0.77-0.93, wherein the amount of Zr present in said first braze material is from 0 to not more than 12 wt %; placing said base material with said first braze material in a vacuum furnace; performing a first heating on said first braze material and said base material for ten minutes to achieve thermal stability between said braze material and said base material; forming a multitude of braze joints between said first braze material and said base material; examining said multitude of braze joints to determine whether a second brazing is desirable; optionally performing a second brazing, wherein said second brazing comprises the steps of; forming a braze joint between said second braze material and said base material.