Patent ID: 9216467
Filing Date: 2015-12-22
Classification: B23K,B23P,B32B,C22C,F28F

Abstract:
1. A method of manufacturing an article joined by brazing or an assembly of brazed components, comprising the steps of: (a) forming the components of which at least one is made from an extruded aluminium alloy tube product, made from an AA1xxx-series aluminium alloy selected from the group of: 1050, 1060, 1100, 1110, 1300, 1350, 1350A, 1370 and 1235, and comprising furthermore a purposive addition of one or more wetting elements selected from the group consisting of: Bi 0.03 wt % to 0.5 wt %, Pb 0.03 wt % to 0.5 wt %, Sb 0.03 wt % to 0.5 wt %, Li 0.03 wt % to 0.5 wt %, Se 0.03 wt % to 0.5 wt %, Y 0.03 wt % to 0.05 wt %, Th 0.03 wt % to 0.05 wt %, and the sum of these elements being 0.5 wt % or less, wherein the alloy is free of each of the elements Na, Li, K and Ca, (b) assembling the components into an assembly, (c) brazing the assembly without applying brazing flux on the assembly of components and brazing the whole assembly in an inert controlled gas atmosphere at a brazing temperature to form a brazed assembly, and (d) cooling of the brazed assembly.