Patent ID: 8991481
Filing Date: 2015-03-31
Classification: B21C,B23K,F28D,F28F,Y10T

Abstract:
1. A heat exchanger for a motor vehicle, the heat exchanger comprising: cooling tubes; and collecting tanks configured such that the cooling tubes extend between the collecting tanks, wherein the cooling tubes and the collecting tanks are spatially connected to each other, wherein the cooling tubes are formed of a strip material having at least one cooling tube seam, the cooling tube seam forming an inner partition wall of the cooling tube, wherein the cooling tubes have an outer brazing layer on an outside of the tube, wherein the cooling tubes have more than one coating on the inside of the tube, one of the coatings on the inside of the tube being an inner brazing layer that is only partially disposed in an area of the at least one cooling tube seam, wherein the inner brazing layer includes aluminum/silicon brazing materials, wherein another one of the coatings on the inside of the tube is a sacrificial or protective brazing layer that is made of pure aluminum, and wherein the strip material is aluminum, stainless steel, or a nickel-based alloy.