The article presents the research results on the mechanical properties of aluminium alloy 5083 – the most currently used in shipbuilding aluminium alloy and its friction stir welded (FSW) joints. Influence of different welding parameters and kinds of welding tools used for the connection of the sheets made of 5083 alloy on quality of the joint were presented. During the study used two types of tools: with cylindrical pin and with conical pin. Metallographic analysis of chosen joints showed the correct construction of structural bonded joints.Friction Stir Welding (FSW) – a new technology can be successfully used for butt welding of different types of aluminium alloy sheets. FSW method can be an alternative to traditional arc welding methods i.e. MIG or TIG. The research was carried out using a static tensile test in accordance with the requirements of the Standards PN-EN ISO 4136:2011 and PN-EN ISO 6892-1:2010. Flat samples cut perpendicular to the direction of rolling were used. The research was conducted at the temperature of + 20 ºC.The shape of the welding tool pin does not affect the strength properties of the FSW welded joint. In the case of joints welded by FSW method, achieved reduction of ultimate tensile strength (UTS) approx. 7 % and yield strength (YS) approx. 12 % compared to the native material. When considering plastic properties of FSW welded joint observed almost 2 times lower elongation comparing to the native material, but meet the requirements of classification societies, including the PRS (Polish Register of Shipping).Keywords: Friction stir welding (FSW), aluminium alloys, joining, welding parameters, mechanical properties
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