DPI has various meanings in the Rail Transport category. Discover the full forms, definitions, and usage contexts of DPI in Rail Transport.
A method for detecting surface porosity or cracks in metal. The part to be inspected is cleaned and coated with a dye which penetrates any flaws that may be present. The surface is wiped clean and coated with a white powder. The powder absorbs the dye held in the defects indicating their location.
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