公开(公告)号：US20200368852A1

公开(公告)日：2020-11-26

申请号：US16992553

申请日：2020-08-13

Applicant: ARCONIC TECHNOLOGIES LLC

Inventor： Baolute Ren ,  Michael P. Danz ,  Marvin Goins

IPC: B23K35/02 ,  B23K35/28

Abstract: An apparatus, material and method for forming a brazing sheet has a composite braze liner layer of low melting point aluminum alloy and 4000 series braze liner. The low melting point layer of the composite braze liner facilitates low temperature brazing and decrease of the diffusion of magnesium from the core into the composite braze liner. The reduction of magnesium diffusion also lowers the formation of associated magnesium oxides at the braze joint interface that are resistant to removal by Nocolok flux, thereby facilitating the formation of good brazing joints through the use of low temperature controlled atmosphere brazing (CAB) and Nocolok flux. The apparatus also enables the production of brazing sheet materials with high strength and good corrosion property.