Capillary action principle - Dye penetrant test - Material Science

Q.  In which type of test the capillary action principle is used?
- Published on 05 Aug 15

a. Probe test
b. Bend liquid test
c. Dye penetrant test
d. None of the above

ANSWER: Dye penetrant test

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    Discussion

  • hamthan welding inspector   -Posted on 05 Jan 18
    in dye penetrant testing ,the surface tension penetrant is lower,that's why it is getting into the discontinuities,so the lower is good,if it is high it will not get into the cracks,so capillarity here is depression into the cracks ,explain the condition and technical detail about this action
  • Sravanthi   -Posted on 07 Oct 15
    Dye penetrant test uses the capillary action principle to detect surface discontinuities. In this method liquid is applied on a metallic surface and it gets entered into cracks which are open. This happens due to capillary action of liquid. This method detects surface cracks, seams,blow holes, laps, porosity, etc.

    A surface penetrant is applied on surface evenly and the liquid penetrant enters into surface discontinuities. Liquid soluble penetrants or fluorescents are the two types of penetrant liquids used. If fluorescent penetrant is used cracks are observed under ultraviolet light. Excess liquid is removed carefully but the penetrant absorbed into cracks is not disturbed. Developer is used to draw the penetrant from the surface cracks which indicate its presence.

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