US 12,466,004 B2
Method of manufacturing a brazing sheet
Yutaka Yanagawa, Tokyo (JP); Tomoki Yamayoshi, Tokyo (JP); Tatsuya Ide, Tokyo (JP); and Taichi Suzuki, Tokyo (JP)
Assigned to UACJ Corporation, Tokyo (JP)
Appl. No. 17/905,423
Filed by UACJ Corporation, Tokyo (JP)
PCT Filed Mar. 22, 2021, PCT No. PCT/JP2021/011667
§ 371(c)(1), (2) Date Sep. 1, 2022,
PCT Pub. No. WO2021/205856, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 2020-069976 (JP), filed on Apr. 8, 2020.
Prior Publication US 2023/0158613 A1, May 25, 2023
Int. Cl. B23K 35/28 (2006.01); B23K 35/02 (2006.01); B23K 103/10 (2006.01); B32B 15/01 (2006.01); C22C 21/02 (2006.01); C22F 1/043 (2006.01); C22F 1/05 (2006.01); C23F 1/20 (2006.01)
CPC B23K 35/286 (2013.01) [B23K 35/0238 (2013.01); B32B 15/016 (2013.01); C22C 21/02 (2013.01); C22F 1/043 (2013.01); C22F 1/05 (2013.01); C23F 1/20 (2013.01); B23K 2103/10 (2018.08)] 23 Claims
OG exemplary drawing
 
1. A brazing-sheet manufacturing method for brazing an aluminum material in an inert-gas atmosphere without using flux, comprising:
a layering process in which a clad slab is manufactured that comprises: a core-material slab composed of an aluminum material; and a filler-material slab composed of an Al—Si—Mg series alloy and disposed on at least one surface of the core-material slab;
a hot-rolling process in which a clad sheet—which comprises: a core material composed of the core-material slab; and a filler material composed of the filler-material slab and disposed on at least one surface of the core-material slab—is manufactured by performing hot rolling on the clad slab;
a cold-rolling process in which one or more passes of cold rolling are performed on the clad sheet; and
an etching process in which, between cold-rolling passes in the cold-rolling process or after the completion of the cold-rolling process, a surface of the clad sheet is etched using a liquid etchant that includes one or more inorganic acids,
wherein the liquid etchant does not contain fluorine atoms.