Butt welding of hard-alloy cermet parts
Our method of butt welding makes it possible to produce hard-alloy parts of any length from plates, rings, cylinders, or billets with other shapes, obtained by means of the usual sintering process.
Butt welding of hard-alloy parts with a cobalt percentage in excess of 6% can be performed successfully without using the “solder.”
In order to secure a strong bond between the surfaces in welding low-cobalt alloys, it is necessary to place between them thin “solder” plates consisting of a mixture of tungsten carbide and cobalt where the percentage of the latter exceeds by 5–10% the cobalt percentage in the parts to be welded, or a cobalt layer with a thickness of 1–3μm, acting as “solder,” is deposited by electrolysis on the surfaces to be welded.
With a higher cobalt content in welding and the subsequent annealing, the interlayers vanish as a result of migration of the liquid phase.
KeywordsMigration Carbide Welding Cobalt Tungsten
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