Non-destructive test - liquid penetrant testing (PT)
Visibility of surface-breaking defects by PT
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. It can change invisible defects to visible defect by using liquid dye.
Mechanism of this test is based on capillary action. Low-tension liquid penetrant is applied into clean and dry surface-breaking defects to spread. After appropriate time has gone, remove excess penetrant and draw out it by developer. Then it is appeared the defects visibly.
Liquid penetrant testing (PT) can be applied to non-metal materials which are not porous it, however, it is impossible to detect inner defects.
It shall be selected proper method depending on test piece –immersing of liquid dye, removing excess it, drawing out it by developer.
- Inside inspection of pressure vessel
- Detection of surface-breaking defects by liquid dye
- Inspection of shaft material by liquid dye
The followings are strong advantage of us.
We are not only familiar with inspection for small machine parts which made by steel, casting, forging, aluminum alloy, titanium alloy, non-ferrous metal, but also familiar with inspection of precision apparatus. We are also familiar with fluorescence magnetic particle examination, which can apply for micro surface-breaking defects. We can provide proper inspection according to demand of customer, because our inspector has variable knowledge about not only industrial codes and regulations but also maintenance of equipment.
