公开(公告)号：US3252510A

公开(公告)日：1966-05-24

申请号：US38955664

申请日：1964-08-14

Applicant: STEWART WARNER CORP

Inventor： BLANKENHORN FREDERICK F

IPC: B21D53/04 ,  B23K1/08 ,  B23K35/28 ,  F28D9/00 ,  F28F3/10

CPC classification number: B23K35/286 ,  B21D53/04 ,  B23K1/08 ,  B23K2201/14 ,  F28D9/00 ,  F28D9/0062 ,  F28F3/10 ,  Y10S165/391

Abstract: 1,122,223. Brazing. STEWART-WARNER CORP. 13 Aug., 1965 [14 Aug., 1964], No. 34815/65. Heading B3R. A heat exchanger assembly comprises a side bar member, and a plate member and a brazing alloy between the members carried by one member adjacent the other member, regions for accommodation of molten flux being defined between the alloy and the other member to extend from opposite edges of the side bar member and each region being terminated short of the edge of the side bar member other than the edge from which it extends. Aluminium or aluminium alloy heat exchanger side bars 12, Fig. 1, connected by dove tails 14 to form rectangular frame members are provided by striking or pressing with grooves 24, 26 from opposite side edges flanked by ridges above the surface. The side bars are assembled sandwich fashion with aluminium or aluminium alloy plate 18 coated on both sides with aluminium based alloy containing Si, Cu, Fe, Zn and possibly Mn and Mg. Corrugated members 22 are provided between the plates 18. The assembly is immersed in molten flux, 4-6% aluminium fluoride and 12-25% lithium chloride to melt the brazing alloy which flows and fills the grooves. In a modification the side bars are not grooved but are provided with convex upper and lower surfaces 72, Fig. 4. Reference has been directed by the Comptroller to Specification 971,889.