What is the correct order of liquid penetrant test?

Explanation: Firstly surface is cleaned. Penetrant is applied and surface flow is made visible. Finally, surface is inspected. –> Inspection.

What is a liquid penetrant inspection?

Liquid or dye penetrant testing (PT) is a non-destructive material testing method which uses capillary forces to find surface cracks or pores and make them visible. It can detect surface-breaking flaws such as cracks, laps, porosity.

What is the basic principle of PT?

The basic principle of liquid penetrant testing (PT) is capillary action, which allows the penetrant to enter in the opening of the defect, remain there when the liquid is removed from the material surface, and then re-emerge on the surface on application of a developer, which has a capillary action similar to blotting …

What is penetrant testing methods?

The four methods are listed below: Method A – Water Washable. Method B – Post-Emulsifiable, Lipophilic. Method C – Solvent Removable. Method D – Post-Emulsifiable, Hydrophilic.

When performing a liquid penetrant test the surface of the part under inspection should be?

Surface Preparation: One of the most critical steps of a liquid penetrant inspection is the surface preparation. The surface must be free of oil, grease, water, or other contaminants that may prevent penetrant from entering flaws.

What is the disadvantage of the liquid penetrant test?

Liquid penetrant testing has the following disadvantages: Extensive, time-taking pre-cleaning critical—surface contaminants can mask defects. Sensitive to surface-breaking defects only. Direct connection to the surface under test necessary.

What types of defects can be detected in a liquid penetrant test?

Liquid penetrant testing (PT) is a one of non-destructive test, which can detect surface-breaking defects-such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks.

What are the advantages and disadvantages of liquid penetrant inspection?

Extensive, time-taking pre-cleaning critical—surface contaminants can mask defects. Sensitive to surface-breaking defects only. Direct connection to the surface under test necessary. Works on relatively non-porous surface materials only.

What is PT test in inspection?

Penetrant Testing ( PT ) – also known as liquid penetrant inspection (LPI) or dye penetrant testing – is based on the properties of surface wetting and capillary action, which causes a liquid to rise when confined to a small opening.

What are the properties of a good penetrant in liquid penetrant inspection?

Physical Properties of Penetrant Materials

• Viscosity.
• Surface Tension.
• Wetting ability.
• Specific gravity.
• Volatility.
• Flash Point.
• Solubility.
• Ability to spread or creep.

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.