Aluminum alloy multi-layered brazing sheet material for fluxfree brazing

US12397377B2 · kind B2 · utility

Assignee

• NOVELIS KOBLENZ GMBH · DE

Inventors

• Bernd Jacoby · Limburg, DE
• Fabian Ritz · Aubachhof, DE
• Arne Schlegel · Aachen, DE
• Steven Kirkham · Ransbach-Baumbach, DE
• Axel Alexander Maria Smeyers · Heist-op-den-Berg, BE

Key dates

• Filing date: Jan 26, 2021
• Grant date: Aug 26, 2025
• Expiry date: Feb 2, 2042

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2101/14
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

An aluminium alloy multi-layered brazing sheet product for brazing in an inert-gas atmosphere without a flux includes a core layer made of a 3xxx alloy including 0.20-0.75 wt. % Mg, and provided with a covering clad layer including 2-5 wt. % Si on one or both sides of said 3xxx alloy core layer and a Al—Si brazing clad layer including 7-13 wt. % Si positioned between the 3xxx alloy core layer and the covering clad layer. The covering clad layer has a thickness X1 and the Al—Si brazing clad layer has a thickness X2 and wherein X2≥2X1. The aluminium alloy multi-layered brazing sheet product can be used in a fluxfree controlled atmosphere brazing (CAB) operation to produce a heat exchanger apparatus.