Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Microstructure of friction stir welds of cast to wrought aluminum alloys

nr katalogowy: 79741

Though friction stir welding (FSW) has significantly matured as a manufacturing technology since its invention in 1991, the associated research efforts have primarily focused on the welding of a particular metallic material to itself. Many types of materials can be joined by this process and accordingly, most of the workable aluminum alloys can be welded by this process, including those that normally cannot be employed in conventional fusion welding techniques. Only just recently the investigations have turned the welding community's attention to the joining of dissimilar metallic materials through FSW. This opened up a window of opportunity for novel research that is extremely important to the manufacturing community. Producing sound, defect-free joints between different aluminum alloys is a major challenge for the further development of the FSW technology. The need to manufacture joints of dissimilar alloys often arises in the automotive, aerospace, and shipbuilding industries. However, fusion welding is inappropriate for these applications because of the chemical and mechanical incompatibilities between the components to be joined. With its relative simplicity and lack of melting, FSW is an ideal technology for joining dissimilar alloys, especially with respect to joints between aluminum-based alloys. Some attempts to investigate the phenomena that occur during friction stir welding of dissimilar metals have been already undertaken [1÷4]. The most recent review summarizing research into friction stir welding over the last decade, involving 25 different, dissimilar materials systems is presented in Ref. [5]. However, the influence of process parameters on the weld microstructure and thus the final mechanical properties is still far from full understanding. The present study is believed to provide new insight into the phenomena occurring during friction stir welding of cast and wrought aluminum alloys. MATERIALS AND EXPERIME[...]

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