The number of industrial applications can be increased by joining hard alloys to metals by welding. This is also the case for direct joints between hard alloys when used for example in production of drilling rods and for tools which have a complicated geometrical shape. Tools of hard alloys which are exposed to high loads can be manufactured in an efficient and economic way by friction welding. Besides improvement of design and increase of the life of tools, a better shape stability and a higher feed load can be realised by applying this joining method. Significant for the friction welding procedure are among others short welding time, symmetrical heat input, high heat capacity of the pieces and low environmental damage. As the joining temperatures are below the melting temperatures it is also possible to weld material combinations which would not show satisfying results when using conventional fusing welding procedures. Investigations which have been made to join powder metallurgical manufactured hard alloys show promising results at butt joints and at static load.
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