摘要:
The present invention relates to a process for joining workpieces made of zinc-containing aluminum alloys by laser beam welding, in which process a layer consisting of vanadium is introduced into the joining gap between the workpieces to be connected to avoid the formation of pores, and the workpieces are then connected to one another by laser beam welding.
摘要:
A Fischer-Tropsch process for producing hydrocarbons from synthesis gas which originates e.g. from biomass gasification, using membrane separators. In the process, an input stream which comprises hydrogen, carbon monoxide as well as further gases and/or vapours is initially fed to a first membrane stage which comprises a steam-selective and carbon dioxide-selective membrane and through which at least some of the steam present in the input stream and some of the carbon dioxide present in the input stream are separated from the input stream to form a permeate stream of the first membrane stage comprising steam and carbon dioxide and a retentate stream of the first membrane stage containing hydrogen and carbon monoxide.
摘要:
A friction stir welding tool having a drivable pin, which is rotatable around an axis, a shoulder element, a first shoulder and at least one spring. The pin includes a cylindrical engagement section that has a circumferential surface that engages a workpiece. The shoulder element includes a contact surface extending transversely to the axis for engagement with the workpiece. The shoulder element includes a friction block connected in a non-rotatable manner to the pin, on which a first friction surface is formed extending around the axis. The first shoulder part includes a second friction surface connected thereto in a non-rotatable manner, extending around the axis. The first and second friction surfaces face one another. The at least one spring biases the first friction surface against the second friction surface. The contact surface is formed on the first shoulder part.