Excessive bending of tungsten wire may cause the following defects:
Wire shrinkage:
During the process of drawing or bending tungsten wire, if it is bent too much, the diameter of the tungsten wire may suddenly become thinner at a certain position, which is called wire shrinkage. This is usually due to excessive bending causing plastic deformation of the tungsten wire at the bend. Wire shrinkage will reduce the surface quality and mechanical properties of the tungsten wire, such as processing and use performance such as cutting, welding, and heat treatment, and will also affect its thermal electron emission performance and luminous brightness.
Cracks:
When the tungsten wire is bent too much, microcracks may be generated in the bending area due to stress concentration. These cracks will reduce the strength and toughness of the tungsten wire and increase the risk of fracture. In subsequent processing or use, these cracks may further expand, causing the tungsten wire to fail prematurely.
Mechanical property degradation:
Excessive bending will cause the mechanical properties of the tungsten wire to deteriorate, such as tensile strength and ductility. This will affect the service life and reliability of the tungsten wire.
Reduced surface finish:
Excessive bending may also cause defects such as scratches and pits on the surface of the tungsten wire, reducing its surface finish. This will affect the aesthetics and performance of the tungsten wire.
Impact on electron emission performance:
For tungsten wire used as electron emission material, excessive bending may damage the electron emission layer on its surface, resulting in a decrease in electron emission performance. This will affect the application effect of tungsten wire in electronic devices.
In order to avoid defects caused by excessive bending of tungsten wire, the following measures can be taken:
During the drawing or bending process, ensure that the position of equipment such as sliding disks and fixing frames is stable to avoid excessive bending stress on the tungsten wire.
Choose a suitable bending radius and bending angle to avoid excessive bending.
Anneal the tungsten wire to eliminate stress and cracks generated during the bending process.
Polish and treat the surface of the tungsten wire before bending to eliminate potential defects and stress concentration points.
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