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Friction stir welds in austenitic stainless steels 316L (0.019%C, 0.87%Mn, 17.70%Cr, 12.19%Ni, 2.19%Mo) and 304 (0.040%C, 1.08%Mn, 18.10%Cr, 8.56%Ni); duplex stainless steel 329J4L (0.016%C, 0.78%Mn, 24.81%Cr, 7.27%Ni, 3.13%Mo, 0.43%Cu, 0.41%W); and ferritic stainless steel 430 (0.070%C, 0.88%Mn, 16.34%Cr, 0.09%Ni) were characterised by microstructural studies and measurements of mechanical properties. The welds were prepared using a polycrystalline cubic boron nitride tool running at 550 rpm, at a welding speed of 80 mm/min, with argon shielding gas. Temperature distributions were measured during welding. Microstructure was studied by optical and transmission electron microscopes. Vickers hardness was measured as a function of distance from the weld, and tensile properties of the 304 stainless steel specimen were measured at room temperature.

4th International Symposium, 14-16 May 2003, Session 10A: Steels 2, Paper 01