Dye penetration testing is also known as liquid penetrate inspection, alias LPI. These tests are carried out to see if there are any breaking defects found on the surface. There are multiple use cases for these tests. Most of the time, they are used upon metals, plastics, non-porous materials and even ceramics. The test is famous for its non-destructive processes and low cost nature. Whenever a new product is to be produced, it would be made to go through dye penetration testing. It identifies all possible leaks and fatigue cracks.
Principle of Dye Penetrant Inspection
As suggested by its name, this inspection focuses on the penetration capabilities of the dye. As the dye is made to flow through the surface, it will be absorbed by any discontinuity and defects. The dye is also identified as a draw penetrant. It is usually applied using common techniques like brushing, dipping and spraying. Once the penetrant is removed from the surface, the developer is applied. The developer acts as a visual inspector. The liquid penetrant inspection system runs tests which are great for spotting irregularities. Additionally, they can also be used to ensure on the durability of the material.
Benefits of using Liquid Penetrant Inspect
- Multiple Use cases: First things first, you can use this form of testing on a variety of geometric shapes. Since the test depends on the level of absorption, the surface doesn’t have to be even. Even if the shape of the surface is complicated, irregularities will absorb the liquid. Eventually, it will be possible to see the presence of defects on the surface.
- Compact: Unlike many other testing methods, the chemicals used as a part of these tests are very compact. It is quite simple to store, and use them during the tests.
- Sensitivity: The test is capable of testing the small discontinuities on the surface. It is quite famous for its highly sensitive nature. Most of the times, industries in hunt for testing methods that can spot impurities which are both tiny, and unevenly spread. This form of testing meets both these requirements
- Flexibility: The liquid penetrant test can be used on a variety of materials. In includes both metallic and non-metallic surfaces, conductive and non-conductive objects and even magnetic and non-magnetic surfaces. All of these materials can be tested flawlessly.
- Visualisation: The test helps engineers visualise the flaw. The indications are drawn directly on the surface.
- Cost: The test is very cost-effective. Each material used in the test, are individually cost effective.