What is a dual sensitivity penetrant?
What is a dual sensitivity penetrant?
In this patent is described a system in which a non-fluorescent dye is combined with a fluorescent dye and used simultaneously in the penetrant to provide two different levels of sensitivity. The penetrant vehicle is either removable by water or by organic solvents, depending upon the other materials contained therein.
What are the 4 methods of penetrant systems?
The four methods are listed below:
- Method A – Water Washable.
- Method B – Post-Emulsifiable, Lipophilic.
- Method C – Solvent Removable.
- Method D – Post-Emulsifiable, Hydrophilic.
What type of penetrant is most sensitive?
Fluorescent penetrant is inherently more sensitive than colour contrast. Post-emulsifiable is more sensitive than water washable since there is less danger of over-washing of the penetrant. Non-aqueous developer is the most sensitive.
How many levels of sensitivity are there in type II penetrant?
| Penetrants | Type I | Fluorescent |
|---|---|---|
| Type II | Visible (Red) | |
| Fluorescent Sensitivity | Level 1/2 | Ultra Low |
| Level 1 | Low | |
| Level 2 | Medium |
What are the limitations of magnetic particle inspection?
Disadvantages of the Magnetic Particle method of Non-Destructive Examination are:
- It is restricted to ferromagnetic materials – usually iron and steel, and cannot be used on austenitic stainless steel.
- It is messy.
- Most methods need a supply of electricity.
Which penetrant method is the easiest to use?
Since visible dye penetrants do not require a darkened area for the use of an ultraviolet light, visible systems are more easy to use in the field. Solvent removable penetrants, when properly applied, can have the highest sensitivity and are very convenient to use.
How do you get rid of extra penetrant?
The excess penetrant may be removed from the object surface with a simple water rinse. These materials have the property of forming relatively viscous gels upon contact with water, which results in the formation of gel-like plugs in surface openings.
How do you clean penetrant dye?
Removing Penetrant When sufficient penetration time has been allowed, wipe the surface clean with a clean towel or cloth. Repeat if necessary. Some surfaces will require only wiping. In general, however, remove excess surface penetrant with clean cloths premoistened with cleaner/remover.
What Cannot be inspected by DPT?
We can only detect any surface discontinuity (or irregularity) such as surface cracks, porosity, pinholes, etc. by this test method. Principle: DPT is based on the principles of CAPILLARY ACTION.
Which penetrant process is the most sensitive to detect fine discontinuities?
Open, shallow discontinuities are best detected by which penetrant testing method?…
| Q. | Which penetrant process is the most sensitive to detect fine discontinuities? |
|---|---|
| C. | Post emulsifiable fluorescent |
| D. | Water washable fluorescent |
Which of the following is a disadvantage of magnetic particle testing over penetrant testing?
Disadvantages of Magnetic Particle Testing: Must de-magnetize in some situations. Only surface and very near surface indications may be seen. Material/Part being tested must be ferromagnetic.