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Haloing - light ring around drill holes

Haloing

Description:
Haloing. It appears as a light ring in the base material around the drill hole. In most of the cases this is a mechanically caused damage to the woven material (delamination, destruction in drill hole). Haloing is acceptable if there are no conductors close to the hole.

Causes/Remedy:
  • mechanical fatigue cracking through drilling, milling

Source: visual, optical inspection - general view
Haloing
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