Hybrid Al/steel-joints manufactured by ultrasound enhanced friction stir welding (USE-FSW): Process comparison, nondestructive testing and microscopic analysis

19th Chemnitz Seminar on Materials Engineering – 19. Werkstofftechnisches Kolloquium

Thomä, M.^1 ; Wagner, G.^1 ; Straß, B.^2 ; Wolter, B.^2 ; Benfer, S.^3 ; Fürbeth, W.^3

Institute of Materials Science and Engineering, Chemnitz University of Technology, Chemnitz

09125, Germany^1

Fraunhofer Institute for Nondestructive Testing IZFP, Campus E3 1, Saarbrücken

66123, Germany^2

DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, Frankfurt am Main

60486, Germany^3

关键词: Conventional materials;    Friction stir welding(FSW);    Lightweight materials;    Microscopic analysis;    Nondestructive testing method;    Partial substitution;    Process comparisons;    Scanning electron microscopic;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/181/1/012003/pdf
DOI  :  10.1088/1757-899X/181/1/012003

来源: IOP

【 摘 要 】

The process of friction stir welding (FSW) is an innovative joining technique, which proved its potential in joining dissimilar metals that are poorly fusion weldable. This ability opens a wide range for applications in industrial fields, where weight reduction by partial substitution of conventional materials through lightweight materials is a current central aim. As a consequence of this, the realization of aluminum / steel-joints is of great interest. For this material compound, several friction stir welds were carried out by different researchers for varying Al/steel-joints, whereas the definition of optimal process parameters as well as the increase of mechanical properties was in the focus of the studies. To achieve further improved properties for this dissimilar joint a newly developed hybrid process named "ultrasound enhanced friction stir welding (USE-FSW)" was applied. In this paper the resulting properties of Al/steel-joints using FSW and USE-FSW will be presented and compared. Furthermore, first results by using the nondestructive testing method "computer laminography" to analyze the developed joining area will be shown supplemented by detailed light-microscopic investigations, scanning electron microscopic analysis, and EDX.