Hot Swaging of Sintered Tungsten Alloy Rod

Sintered tungsten alloy rod can not be worked mechanically while cold. It is so hard that it cannot be machined by sharp edge tools, but has to be brought into desire shapes by high temperature hammering or cold grinding. The rough anode head for the Universal tube is formed from a sintered tungsten alloy rod in a swaging machine which is a nicely controlled high speed hammer used in this case to reduce, by successive operations the diameter of the a sintered tungsten alloy rod.

Sintered tungsten alloy rod is heated to about 1600°C in an atmosphere of hydrogen gas in an electric furnace, and is then rapidly passed through, the swaging machine. In this operation the diameter of sintered tungsten alloy rod is reduced 10 percent. The rod is then re-heated in the furnace and is ready for the next pair of swaging dies, which will again reduce its diameter by 10 per cent. When the rod is at the required diameter for the head of the anode, the end of the rod only is swaged down to form the taper and straight portion to which the molybdenum stem is attached. After rough grinding to approximate size and shape, the anode head and molybdenum stem are swaged together. The assembly is completed by the addition of an iron collar and a thin metal tube and the finished anode is then polished and very carefully cleaned.


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