Optical indentation measurement
Optical indentation measurement is the light-microscope measurement of the size of a permanent test indentation, e.g., from Vickers or Brinell. It is used to calculate hardness.
Physical-Chemical Mechanism of Action
Optical indentation measurement measures the diagonal or diameter dimensions of a permanent test indentation under microscope light. This indentation is created by pressing a heavy cone or ball into the metal's surface.
Metallurgical Relevance & Risks in Welding
Accurate measurement of indentation dimensions is critical for correct hardness calculation. Incorrect measurements lead to inaccurate results and can cause poor decisions in material selection or quality assurance.
Shop Practice & Action Guidelines
Use a high-resolution light microscope with precise measuring equipment. Make sure the indentation is clear and free of distortion or corrosion. Take measurements under consistent lighting conditions. Record dimensions in micrometers and calculate hardness according to the relevant standard (e.g., Vickers hardness).