One Of The Important Metals Tungsten Tube

Using WF6 and H2 as raw materials, refractory tungsten tubes with different diameters were prepared by chemical vapor deposition method. The purity, density, microhardness, residual stress and strength of tungsten tubes prepared by deposition at different deposition temperatures (500°C, 600°C, 700°C) were tested. The deposition of tungsten tubes has high purity and high density; With the different deposition temperature and tungsten tube radius (3~20 mm), the microhardness value is between 500~800 HV. There is a large residual stress along the circumference and radius of the tungsten tube. The tensile strength range is 300~500 MPa.

1.The outer layer of the composite round tube is beryllium tube and the inner layer is tungsten tube, which is formed by interference fit. The stress field and the residual stress distribution after welding were obtained by using MARC software, and the influence of interference on the welding residual stress distribution of the composite round tube was further studied, and the welding residual stress distribution on the outer surface of the composite round tube was tested by X-ray method. The calculated finite element value of welding residual stress is basically consistent with the change trend of the measured value, and the finite element model is verified.

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