Tungsten Electrode Production Technology - Swaging Process

Obtained tungsten billet by powder metallurgy method, should to go through swaging, drawing, straightening, polishing and other follow-up process, which can be processed into various size and length tungsten electrode. Swaging, also known as rotary forging, is forging a special forged. Using swaging to process plastic working on tungsten electrode can reduce electrode‘s diameter and increase the length, while improving the physical and chemical properties of the electrode, to improve the plasticity and other properties of the electrodes. Swaging process operation by swaging machine, through high-speed rotation, drives rollers and swaging dies to operate and makes swaging die to linearly reciprocate, to forge tungsten billet. In the plastic working is generally subjected to initial deformation, recrystallization annealing and second return deformation.

In the process of swaging, to process deformation on tungsten billet easily lead to electrode inside and outside organization uneven. In general, the degree of surface deformation is large and center deformation is small, so the stress of electrode distribution is also not uniformly. Therefor, between the first and second deformation to process recrystallization annealing can adjust the electrode internal fibrous structure, thereby improving the processing performance of the electrode. Swaging process is the first deformation of the electrode, and it plays an important role for successful subsequent processing. So the reasonable swaging process can produce beneficial to plastic deformation microstructure. In addition, during swaging process, the processing temperature and processing passes is an important factor of swaging effect, so should be strictly controlled.

In the swaging process, the tungsten bar in stress state is in favor of deformation processing. In addition, small passes deformation, high forging frequency can make tungsten bar to distort at small deformation force, but the swaging process required more molds. Due to the small amount of deformation always starts from the surface of tungsten bar, so easy to make tungsten electrode uneven distribution of stress and deformation, resulting in defects in subsequent processing.

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