Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

The effect of FSW parameters on the microstructure and properties of 2017A/AlSi9Mg aluminium alloy welds

KRZYSZTOF MROCZKA

nr katalogowy: 79726

Plastic deformation caused by a tool of a specific shape is the basis of the Friction Stir Welding (FSW) process [1]. Welding is performed in the solid state, but the key condition for obtaining a joint which is acceptable in terms of quality is the good plasticity of the materials subject to welding. A much smaller amount of heat applied to the joint area is an advantage of the FSW welding process. This reduces the size of the heat-affected zone. Conventional welding is performed using FSW-tool consisting of a pin and a shoulder - the overall shape resembles a screw where the pin is the threaded part and the shoulder is the bolt head. The FSW method has been modified in many ways. The most important changes concern the tool, such as the pin rotating at a speed different than the shoulder's speed or the tool having two shoulders - this kind of tool is known as the bobbin-tool. The FSW method is also applied to structural modification of materials as the Friction Stir Processing (FSP) [2]. The quality of FSW is affected by a wide range of factors including mainly welding parameters and the shape of the tool [3]. They affect not only the quality of the weld but also its structure. Conventional FSW joints are asymmetric relative to the their axis (the line of welding). Typically, a weld nugget is observed in the central part, which is the part of the thermomechanically affected zone. The weld nugget consists (wholly or mostly) of the material located in the advancing side [4] - the advancing side is located at the left-hand side of the tool moving away linearly and rotating clockwise [5]. Under these conditions material flow is highly varied depending on the location within the weld, what has been the subject of numerous studies [6]. Because of the ability to produce dissimilar welds [7], the 2017A and AlSi9Mg welds are used to estimate the impact of parameters (including and conditions) on the microstructure and properties[...]

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