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    Microstructural and Mechanical Characterization of Friction Stir Butt Joint Welded 63% Cu-37% Zn Brass Plate
    (Amer Welding Soc, 2009) Cam, G.; Mistikoglu, S.; Pakdil, M.
    A recently developed solid-state joining technique, namely friction stir welding (FSW), has been well demonstrated to produce joints with better joint performances in Al alloys, particularly in difficult-to-weld grades, than those obtained in more conventional fusion welding processes. The technique has already been implemented with joining Al alloys in various production lines such as shipbuilding, automobile, high-speed train manufacturing, and aviation industries. In this study, the applicability of friction stir welding to 63% Cu-37% Zn brass plate has been investigated. The joint performance values were determined by conducting optical microscopy, microhardness measurements, and mechanical testing (e.g., tensile and bend tests). The effects of the tool rotational speed (i.e., 1250 and 1600 rev/min) and the welding speed on the joint performance were determined. The best joint performances were obtained at a rotational speed of 1600 rev/min with a welding speed of 225 mm/min.
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    Microstructural and mechanical characterization of laser beam welded AA6056 Al-alloy
    (Elsevier Science Sa, 2011) Pakdil, M.; Cam, G.; Kocak, M.; Erim, S.
    Laser beam welding is considered to be a suitable joining process for high speed, low distortion, and high quality fabrication of aircraft structures manufactured from aluminum alloys, which are mainly preferred due to their favourable properties, such as high strength to weight ratio, ease of forming and high thermal and electrical conductivity. However, the laser beam welding of 6000 series aluminum alloys may exhibit a tendency to solidification cracking, and porosity may be a major problem unless appropriate welding parameters and filler metal are employed. In this study, the microstructural aspects and mechanical properties of laser beam welded new generation aluminum alloy, namely 6056, developed especially for aircraft structures, are investigated. A continuous wave CO2 laser using AlSi12 filler wire was employed. A detailed microstructural examination of the weld region was carried out by Scanning Electron Microscopy (SEM). Standard tensile and microflat tensile specimens extracted from the welded plates were tested at room temperature for the determination of general and local mechanical properties of the welded joints. Extensive microhardness measurements were also conducted. Crack growth mechanisms of the joints produced were also determined by conducting fatigue tests under various stress ratios (i.e., 0.1 <= R <= 0.7). (C) 2011 Elsevier B.V. All rights reserved.