公开(公告)号：US20210308783A1

公开(公告)日：2021-10-07

申请号：US17235598

申请日：2021-04-20

Applicant: ARCONIC TECHNOLOGIES LLC

Inventor： Ali Unal ,  June M. Epp ,  Donald J. Spinella ,  Raymond J. Kilmer ,  Li M. Ming

IPC: B23K11/11 ,  B23K35/02 ,  B23K35/28

Abstract: A method for resistance spot welding aluminum alloys includes reducing the electrical resistance of an outer surface of the stackup in contact with the anode while leaving the faying surfaces at higher resistances, e.g., by grit blasting the anode contacting surface. High resistance electrodes, e.g., with refractory metal content may be used. Stackups of greater than two members may be used. Sheet material may be prepared having the lower and higher resistance surfaces and used with other sheets having higher resistance surfaces. The cathode contacting surface of the stackup may also have a reduced resistance. The method and sheet may be used in assembling vehicle bodies.