In recent year, the use of magnesium alloys in aerospace, space, and automotive industry as structural materials has gradually been increased. The solid state welding method for joining of these materials were effective. The friction stir welding is one of the solid state welding method. In this study, the weldability of rolled AZ31B magnesium sheets has been investigated by friction stir welding. Samples have been welded at different welding parameters such as the 1500, 2300 rpm rotational

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... ds and 100,160 and 190 mm/min transverse speeds. In order to investigate the effect of welding speeds and rotational speeds on metallurgical and mechanical properties, metallographic and mechanical tests were carried out on the welded areas of the samples.