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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. An ast, of a gear tooth crack that was made more visible using a dye penetrant examination is shown in Figure 1.
Energy-Tech Magazine Contact us. It should be pointed out, however, that after indications have been produced, they must be interpreted or classified and then evaluated. 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.
Work Item s – proposed revisions of this standard. They can be effectively used in the examination of nonporous, metallic materials, both ferrous and nonferrous, f165-02 of nonmetallic materials such as glazed or fully densified ceramics, certain nonporous plastics, and glass.
Link to Active This link will always route to the current Active version of the standard.
Non-destructive examination NDE is used to detect cracks and other flaws in a part without rendering the part unusable by performing destructive testing. The correct term for a discontinuity is an indication, which is not necessarily a crack or a flaw. Advertisement 4 Go to Page 1 2 3 4 Edit Story. The e165-022 penetrant examination just makes the discontinuities easier to see.
Qstm must be taken not to overly clean and remove the penetrant from the discontinuities.
This method substitutes fluorescent penetrating oil for the visible dye penetrant. Agreement by the user and the supplier regarding specific techniques is strongly recommended. In most cases, the discontinuities are visible to the naked eye without liquid penetrant testing.
Some equipment manufacturers allow some surface indications, depending on their size and location on a particular part. A common recommendation is to use solvent and not potable e1655-02 when cleaning stainless steel ee165-02, such as turbine rotors, that will be highly stressed when in service.
ASTM E(02) – [PDF Document]
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This might involve sandblasting, wire brushing, etc. This can take minutes after the developer is applied.
1e65-02 Cracks typically show up as red lines and pits usually look like red dots. Some of the most popular NDE methods include: Penetrating oils typically contain a red dye and are sprayed or brushed onto the area of the material being tested.
This is typically done with a special cleaning solvent. One of the most critical aspects of liquid penetrant testing is interpreting and evaluating the discontinuities. A suitable waiting time allows the penetrant to enter the surface discontinuities, and then excess penetrant can be removed. Pre-clean the surfaces to be inspected. These inspections can increase the reliability of the part by providing early detection of flaws that could lead to a failure. 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.
The penetrant that is trapped in any discontinuities will glow when viewed under a black light. To avoid this, any indications should be investigated by polishing and re-evaluating the indication.
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.
A scratch or a pore can easily be misinterpreted as a crack or flaw, and this can lead to unnecessary and costly repairs. The visible dye penetrant technique involves the following steps: As soon as the material is dry, the developer is applied.
The part then needs to be cleaned to remove the penetrant and the developer.
Then the surface must e16502 allowed to dry. Non-destructive examination basics Patrick J. Box Dubuque, IA Phone: The visible dye penetrant technique involves the following steps:. Also, there are no universal acceptance criteria on the maximum allowable size of an indication.
SI units are provided for information only. The surface then needs to be solvent cleaned to remove any greases or oils. It astmm a common misconception to label a discontinuity as a crack.