Abstract: The present invention relates to a corrosion resistant magnesium alloy which can be prepared with a justifiable expenditure of energy from scrap or impure copper containing precursors and displays a ductility such that it can be used as a casting or kneading material. The magnesium alloy contains, relative to the total weight of the magnesium alloy, 1 to 9 wt. % aluminium, 0.6 to 6 wt. % zinc, 0.1 to 2 wt. % manganese, 0 to 2 wt. % rare earth elements, 0.5 to 2 wt. % copper, wherein the weight ratio of aluminium to zinc lies in the range from 1:1 to 2:1.

Abstract: Illustrated and described is a friction stir welding device for mounting on a handling device. The object that the forces and moments which have to be absorbed by the handling device during the welding operation in the course of the movement of the friction stir welding tool along the weld seam are independent of the welding operation is achieved by a friction stir welding device with a tool drive, with a mounting element for connection to the handling device, with a friction stir welding tool, which is driven by the tool drive in a rotating manner about an axis of rotation, with a counterbearing roller and with a counterbearing drive, the counterbearing drive driving the counterbearing roller in a rotating manner about a counterbearing axis and the circumferential surface of the counterbearing roller being arranged opposite the friction stir welding tool.

Abstract: A membrane is produced by dissolving one or more polymers, at least one of which is a block copolymer, in a liquid which includes a solvent, to produce a casting solution. The casting solution is formed into film, and the film is immersed into a precipitation bath which contains at least one non-solvent for the block copolymer so that the film forms a membrane. The membrane is used for filtering a fluid that contains colloidal particles or proteins, and/or for ultrafiltration or nanofiltration, by flowing the fluid through the membrane.