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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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part atm the standard.
This might involve sandblasting, wire brushing, etc. The part then needs to be cleaned to remove the penetrant and the developer.
The purpose of this article is to describe these basic NDE techniques and discuss some of the advantages and disadvantages of the different methods.
A scratch or a pore can easily be misinterpreted as a crack or flaw, and this can lead to unnecessary and costly repairs. This is typically done with a special cleaning solvent. 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 e165–02 unacceptable.
ASTM E – 02 Standard Test Method for Liquid Penetrant Examination
Work Item s asfm proposed revisions of this standard. Agreement by the user and the supplier regarding specific techniques is strongly recommended. Pre-clean the surfaces to be inspected.
Another technique involves the use of an ultraviolet light to view the surface discontinuities.
In most cases, the discontinuities are visible to the naked eye without liquid penetrant testing. These inspections can increase the reliability of the part by providing early detection of flaws that could lead to a failure. 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. Energy-Tech Magazine Contact us.
MET-L-CHEK ROT ( ml). Penetrant testing. Non-destructive testing. Quality System
An example of a gear tooth crack that was made more visible using a dye penetrant examination is shown in Figure 1. As soon as the material is dry, the developer is applied. The surface then needs to be solvent cleaned to remove any greases or oils.
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 capillary action. Also, there are e165-002 universal acceptance criteria on the maximum allowable size of an indication.
ASTM E165 02 – Español
A suitable waiting time allows asm penetrant to enter the surface discontinuities, and then excess penetrant can be removed. The visible dye penetrant technique involves the following steps:.
Non-destructive examination NDE is used to detect cracks and other flaws in a part without rendering the part unusable by performing destructive testing. Box Dubuque, IA Phone: The liquid penetrant examination just makes the discontinuities easier to see. The correct term for a discontinuity is an indication, which is not necessarily a crack or a flaw.
The 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. Cracks typically show up as red lines and pits usually look like red dots. 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.
One of the most critical aspects of liquid penetrant testing is interpreting and evaluating the discontinuities. 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.
Some equipment manufacturers allow some surface indications, depending e1650-2 their size and location on a particular part. SI units are provided for information only. Then the surface must be allowed e165-0 dry.