THE IMPORTANCE OF FRICTION STIR WELDING …（搅拌摩擦焊接的重要性u2026）.pdf

Production Processes and Systems, vol. 6. (2013) No. 1., pp. 25-34. THE IMPORTANCE OF FRICTION STIR WELDING TOOL Ákos Meilinger, Imre Török University of Miskolc, Department of Mechanical Technology Abstract The friction stir welding is a dynamically developing version of pressure welding process- es. It was developed in England by The Welding Institute (TWI) in 1991. High-quality weld can be created by this process with e. g. a milling machine because using same movement conditions but the tool is different. Basically other tool design is needed because the goal isn’t the material removing but the material mixing and heating by frictional heat. The tool must be meet several important requirements. On the one hand in the course of mixing the material flow conditions specifically affect the quality of the weld, so the tool geometry is very important. On the other hand significant dynamic stress occurs with high heat load and abrasive wear depending on the material. The tool has evolved reasonably in point of geometry, material and coating in the past two decades. I would like to show the importance of tools of friction stir welding in this article. Keywords: friction stir welding, FSW tool 1. Introduction Friction stir welding (FSW) is a solid-state process, which means that the objects are joined without melting of base metals. This opens up whole new areas in welding technolo- gy. In FSW, a cylindrical shouldered tool with a profiled pin is rotated and plunged into the joint area between two pieces of sheet or plat e material. The parts have to be securely clamped to prevent the joint faces from being forced apart. Frictional heat between the wear resistant welding tool and the workpieces causes the latter to soften without reaching mel