Tungsten Carbide Cutting Tools Welding Crack

Inserts welded of tungsten carbide cutting tools is a very important process. Due to chemical composition and mechanical properties of carbide and steel is completely different, often in the welding prone to cracking and welding which makes tungsten carbide cutting tools scrapped.

Tungsten carbide cutting tools welding crack caused by excessive stress. After sufficient heating, tungsten carbide cutting tools cooling starts, weld solidification. Since the thermal expansion coefficient of steel is 2-3 times larger than the carbide to produce different shrinkage in steel and cemented carbide, after reaching room temperature, the contraction of steel when carbide twice. The result is a gradual contraction tensile stresses in the tungsten carbide cutting tools which results in tungsten carbide cutting tools welding crack. Further, in the cemented carbide 950 ° C-1100 ° C will produce vigorous oxidation, the oxide film formed brittle carbide leaving many voids, thereby reducing the mechanical properties of tungsten carbide cutting tools. Thus, during welding, it is necessary to avoid oxidation of the welding area.

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