Extension of Gap Bridgeability and Prevention of Oxide Lines in the Welding Seam through Application of Tools with Multi-Welding Pins

Friction stir welding has become important in many areas of production and is increasingly used for joining aluminum components. For long seams, conventional tools with only one pin reach their technical limitations due to low gap bridgeability. When aluminum, the stirred surface layers, such as oxides, lead a decrease static dynamic strength since linear accumulations are formed seam. The aim present study increase bridgeability using various pins prevent accumulation results show that up 2 mm 4 material thickness possible alloys EN AW 5083 H111 7020 T651. With help multi-pin tools, no impact width on tensile was observed joint gaps 0.9 when butt sheet mm. Furthermore, use showed significant influence prevention In addition, oxide layers were finely distributed welded joints tools.