Issue 46

H. Mekri et alii, Frattura ed Integrità Strutturale, 46 (2018) 62-72; DOI: 10.3221/IGF-ESIS.46.07 64 Table 1: Chemical compositions of AA 6061-T5 and Galvanized steel. E XPERIMENTAL METHODS The welding machine he basic principle of process FSSW is carried out on a modified conventional milling machine. This machine is largely used for the operations of machining in industry. It is one of the first machines used to carry out FSW. Figure 2: Clamping of the joint configuration on the FSSW machine. It can apply up to 360 KN of axial load [5], which makes it possible to weld plates of aluminium alloys until 15mm thickness. The tool of welding and the system of fastening is shown in Fig.2. Joint configuration, tool and its geometry The main dimensions of the tool made of height strength steel are given in Fig. 3. The fixed probe has a diameter of 5 mm and a length of 1.8 mm. The flat shoulder has a diameter of 10 mm. These geometrical characteristics were selected on the basis of preliminary tests developed by several researchers [5-8]. Figure 3: Tool geometry and processing variables Materials Si Fe Cu Mn Mg Cr Zn Ti C P Alt S 6061-T5 0.6 0.30 0.10 0.10 0.60 0.05 0.1 0.1 ..... ..... ..... ..... Galvanized Steel 0.5 Rest ..... 1 ..... ..... ..... ..... 0.1 0.03 0.025 0.025 T