Comparison of Tungsten Round Bar and Tungsten Square Bar

Uneven tungsten billet sizes would cause the nonuniform resistance and large different temperature of each part of wolfram bar during a sintering process. Therefore, due to the different degree of sintering, the degree of combustion of the large size part is too low, but the small part is over-firing, which will cause the fuse. It is best to use the automatic charging machine and tracking piamater retractor and reasonable pressing parameter. So that it can ensure that diameter fluctuations of each part of the round billet can be stabilized within ±0.4mm after sintering.

At the beginning of it, we can see the difference between the square billet and round billet. On the universal testing machine, respectively compare to the compression strength and bending strength of green molding, pre-sintered compact, and isopressed compact. Pressed at the same pressure, the density of isostatic green compact is 1.15 times that of the green molded billet, and compression strength is 6.5 times, its bending strength is 2.7 times that of green die blanks. After pre-sintering, the density of square billet and round billet are approximately the same, compressive strength of round billet is 1.4 times that of square billet, and the flexural strength is 2.1 times. We can finger it out from here that round billet is not easy to be damaged during transport.

When swaging for both materials, it will be found that the surface of the tungsten square bar will often appear subtle cracks, if the swaging temperature rises, then the crack phenomenon would become more serious. Under the same conditions, the round tungsten bar doesn’t have this problem. This is because when the square tungsten is swaging, its edges, faces, and the center pat cannot receive strength evenly, and the degree of deformation also have a greater difference. The tungsten bar is the refined form of tungsten ore, which acts like silver grade tools. But armor and tools made of it will be classed as tungsten equipment. With the processing of tungsten elongated, and the part which did not receive would easy crack with the rest part. Uniform density, round face of cross-section and not forming agent of tungsten round bar eliminate defects of worked structure in a certain extent.

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