Estimation of Extrusion Welding Conditions for 6xxx Aluminum Alloys

Abstract

Extrusion of hollow shapes containing longitudinal welds from easy-to-weld aluminum alloys is realized in industrial practice by using porthole dies. In the work, an original method and a special modified device is presented that simulates conditions occurring in a welding chamber of the porthole dies. The weldability tests were performed for low and medium-component 6xxx alloys – in a wide range of welding temperatures and pressures. The seam welds strength were examined. The microhardness test was performed perpendicularly to the surface of welding. The microstructure of the material both in the welds region and outside them were examined by using light microscope and scanning microscope SEM. The chemical composition was examined used the EBSD method. Most favorable welding conditions for the tested alloys, allowing for obtaining high-strength welds were defined.