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As soon as the material is dry, the developer is applied. This is typically done with a special cleaning solvent. The visible dye penetrant technique involves the following steps: The surface then needs to be solvent cleaned to remove any greases or oils. Some equipment manufacturers allow some surface indications, depending on their size and location on a particular part.
They can be effectively used in the examination of nonporous, metallic materials, both ferrous and nonferrous, and of nonmetallic materials such as glazed or fully densified ceramics, certain nonporous plastics, and glass.
The part then needs to be cleaned to remove the penetrant and the developer. The penetrant that is trapped in any discontinuities will glow when viewed under a black light.
Box Dubuque, IA Phone: These inspections can increase the reliability of the part by providing early detection of flaws that could lead to a failure. The correct term for a discontinuity is an indication, which is not necessarily a crack or a flaw. Non-destructive examination basics Patrick J.
Active view current version of standard. With this technique, liquid penetrant is applied to the surface of a material and is drawn into surface discontinuities such as cracks, pits and seams by e16502 action. Liquid penetrant testing Liquid penetrant inspection is the most popular method to check for surface cracks because it is simple and no special equipment is required. Work Item s – proposed revisions of this standard.
It is a common misconception to label a discontinuity as a crack. This might involve sandblasting, wire brushing, etc. Advertisement 4 Go to Page 1 2 3 4 Edit Story.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Adtm reason is that some potable water sources contain chlorine, which can leave a residue on the surface and can lead to cracking in some stainless steels. Energy-Tech Magazine Contact us.
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The visible dye penetrant technique involves the following steps:. The purpose of this article is to describe these basic NDE techniques and discuss some of the advantages and disadvantages of the different methods. Another technique involves the use of an ultraviolet light to view the surface discontinuities. It should be pointed out, however, that after indications have been produced, they must be interpreted or classified and then evaluated.
Some of the most popular NDE methods include: An example of a gear tooth crack that was made more visible using a dye penetrant examination is shown in Figure 1. Care must be taken not to overly clean and remove the penetrant from the discontinuities. A scratch or a pore can easily be misinterpreted as a crack or flaw, and this can lead to unnecessary and costly repairs.
The liquid penetrant examination just makes the discontinuities easier to see. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Cracks typically show up as red lines and pits usually look like red dots. Also, there are no universal acceptance criteria on the maximum allowable size of an indication. One of the most critical aspects of liquid penetrant testing is interpreting and evaluating the discontinuities.
SI units are provided for information only. After application of the developer, the visual inspection is done with a black light. They are nondestructive testing methods for detecting discontinuities that are open to the surface such as cracks, seams, laps, cold shuts, laminations, through leaks, or lack of fusion and are applicable to in-process, final, and maintenance examination.
A common recommendation is to use solvent and not potable water when cleaning stainless steel parts, such as turbine rotors, that will be highly stressed when in service. Link to Active This link will always route to the current Active version of the standard.
This technique can be used on a variety of ferrous and non-ferrous materials, including steel, stainless steel, aluminum, bronze, tungsten carbide, ceramics and plastics. Agreement by the user and the supplier regarding specific techniques is e165-022 recommended. Pre-clean the surfaces to be inspected.
xstm For this purpose there must be a separate code or specification or a specific agreement to define the type, size, location, and direction of indications considered acceptable, and those considered unacceptable.