Suppression Method of Tungsten Tube Surface Transverse Cracks (1)

Suppression method of tungsten tube surface transverse cracks:

Rate of temperature increase of annealing treatment should be carried out slowly instead of too fast; especially the temperature ranges below tungsten’s brittle transition temperature, in order to release deposition tungsten tube’s internal stress slowly.

Underspeed the cooling rate after the end of the deposition, especially the temperature ranges above tungsten’s brittle transition temperature. This is an important thing, particularly for the deposition preparation of products which has big size, thick wall, and complex shape and is easy to produce concentrated stress.

In the condition of meeting the strength requirements and processing conditions of the deposition matrix, the matrix thickness should be uniform and as thin as possible to reduce the deformation stress during cooling process.

Selecting the matrix material whose expansion coefficient is close to the base material, by this way, the residual stress within deposited products can be significantly reduced.

 

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