Surface Crack Detection

We shall consider how they are used, and what types of welding discontinuities they can be expected to find.

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We shall examine their advantages over other inspection methods and their limitations.

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It cannot detect discontinuities that are sealed within the body of the weld such as internal porosity, or fusion defects.. Liquid Penetrant Testing (PT) – This is probably the most common method of surface crack detection used.. Second, the careful removal of any excess penetrant, usually with a solvent or sometimes with a water wash, dependent on the method used.. The method of detection is different for the color contrast and the fluorescent dye.

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var q = 'surface%20crack%20detection'; One of the many Non Destructive Testing (NDT) techniques used for the inspection of welding is surface crack detection.. Magnetic Particle Testing (MT) – This is an NDT method used for detecting cracks, porosity, seams, inclusions, lack of fusion, and other discontinuities in ferromagnetic materials.. The fluorescent dye method is assisted by the use of an ultraviolet light (black light) that is used to illuminate the fluorescent dye and assist in the interpretation of the test.. It is not usually suitable for testing rough or porous materials because interpretation of the test results can be hindered by false indications.

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These three steps are followed by the interpretation and evaluation of the test results.. This type of inspection may be suitable for both ferrous and nonferrous materials.. Both these methods use the same fundamental procedure First, the application of a penetrating liquid to the surface of the weld to be tested, followed by a predetermined soak period to allow for adequate penetration of the liquid penetrant into any surface breaking discontinuities.. Third, the application of a developer to withdraw penetrant left behind within any discontinuity.. This type of testing is limited to the detection of surface breaking discontinuities, that is, discontinuities which are open to the surface to which the penetrant has been applied.. We shall briefly examine the two most common methods of surface crack detection, Liquid Penetrant Testing (PT), sometimes referred to as Dye Penetrant Inspection, and Magnetic Particle Testing (MT).. This will involve the detection of penetrant bleed-out from within any surface discontinuity.. The color contrast method is dependant on the bright contrast between the red penetrant dye and the white developer background covering the surface of the weld being tested, and the evaluation of the test is conducted in ordinary light.. We shall consider the two most common methods of this testing method, Color Contrast and Fluorescent Dye.. When compared to unassisted visual inspection, this type of inspection can provide a more sensitive inspection method that is more likely to detect smaller and finer surface breaking discontinuities, such as hair line cracks and micro surface porosity. 0041d406d9