Material factors in relation to development time in liquid-penetrant inspection. Part 3. Testing of model plates

Abstract

The paper is the continuation of the previous ones entitled .,Material factors in relation to development time in liquid-penetrant inspection. Part 1. Material factors and .,Material factors in relation to development time in liquid-penetrant inspection. Part 2. Investigation programme and preliminary tests in which material factors influencing essentially the development time in penetrant testing as well as the range of their values have been specified. These factors are: material kind, surface roughness and imperfection width. In the paper it has been described how far the development time in colour penetrant testing is influenced by an individual material factor. Moreover, it has been presented the equation being the function of material factors and development time.