Issue 24

H.S. Patil et alii, Frattura ed Integrità Strutturale, 24 (2013) 151-160; DOI: 10.3221/IGF-ESIS.24.16 153 E XPERIMENTAL PROCEDURE he experiments were conducted on the aluminium alloy AA6082-T6 and AA6061-T6, its chemical composition and mechanical properties are respectively presented in Tabs. 1 and 2. The rolled plates of 5mm thickness were cut into the required size (300mm×150 mm) by power hacksaw cutting and grinding. Square butt joint configuration was prepared to fabricate FSW joints. The initial joint configuration was obtained by securing the plates in position using mechanical clamps. The direction of welding was normal to the rolling direction. Single pass welding procedure was used to fabricate the joints. In present work hexagonal tool pin profile was used for the welds, made of cold work die steel. The tool dimensions are shown in Fig. 2. The machine used for the production of the joints was vertical machining centre. Different materials positioned on the advancing side of the tool allowed four different welding conditions described in Tab. 3. Chemical Composition Element Si Fe Cu Mn Mg Cr Zn Ti Required 0.7-1.3 0.5 0.1 0.4-1.0 0.6-1.2 0.25 0.2 0.1 Contents 0.9 0.24 0.9 0.7 0.7 0.06 0.04 0.05 Mechanical Properties Tensile Strength (MPa) Yield Strength MPa) Elongation (%) Hardness(HV) Min Max Min Max Min Max 295 -- 240 -- 8 -- 89 324 332 308 319 9 12 90 Table 1 : Chemical composition and mechanical properties AA6082-T6. Chemical Composition Element Si Fe Cu Mn Mg Cr Zn Ti Required 0.4-0.8 0.7 0.15-0.4 0.15 0.8-1.2 0.04-0.35 0.25 0.15 Contents 0.62 0.45 0.2 0.18 1.05 0.09 0.03 0.07 Mechanical Properties Tensile Strength (MPa) Yield Strength MPa) Elongation (%) Hardness(HV) Min Max Min Max Min Max 300 -- 241 -- 6 -- 95 328.57 335.71 282 296 11 11.8 98 Table 2 : Chemical composition and mechanical properties AA6061-T6. Materials of Joints Rotational Speed (rpm) Welding Speed (mm/min) Tool Depth (mm) Downward Force(KN) 6082T6-6061T6 1600 50 4.6 14 6082T6-6061T6 1600 62 4.6 11 6061T6-6082T6 1600 50 4.6 11 6061T6-6082T6 1600 62 4.6 11 Table 3 : Welding conditions employed to join the AA6082–AA6061 plates. T