Process for manufacturing hard-soldered aluminum heat exchangers

US5839646A · kind A · utility

Assignee

• Behr GmbH & Co. · DE

Inventors

• Bernd Duda · Rochlitz, DE
• Klaus Lorenz · Worms, DE
• Cord Voelker · Backnang, DE

Key dates

• Filing date: Dec 23, 1996
• Grant date: Nov 24, 1998
• Expiry date: Dec 23, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2101/14
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A process for manufacturing hard-soldered aluminum heat exchangers is provided. For heat exchangers which are provided with flat tubes of a narrow interior with, known soldering processing operating with a fluxing agent cannot be used or can only be used with extreme difficulty. For such flat tubes, and optionally for turbulence inserts which can be slid into such flat tubes, certain materials and coatings are provided which result in a soldered connection in the tube interior where, according to the new process, no fluxing agent is used.