Veracity World is an Authorised Distributor of Mr Chemie in the UAE.
Quality assurance – to the highest German standards
The company MR® Chemie GmbH operates all over the world and is a manufacturer of specialised innovative products and devices for surface crack testing.
We take pride in introducing & representing MR Chemie, in the UAE region, known worldwide for manufacturing consumables for Non Destructive Testing. Our products are certified by Saudi Aramco, Bureau Veritas, NPCIL, PMUC (EDF), Det-Norske Veritas, L&T and Lloyd’s to name a few.
MR Chemie offers a wide range of equipment for Penetrant Testing (PT) and Magnetic Particle Inspection (MPI),as well as service such as recalibration ,repairs, maintenance and spare parts supply.
1. DP TEST
In Penetrant Testing procedure (also known as DP test or dye penetrant inspection), you can quickly determine surface discontinuities on all iron metals and non-iron metals, some plastics and ceramic materials, glass, etc., provided that the discontinuities are open to the surfaces. The liquid penetrant test method is used in the examination of welding seams, cast pieces, in shipbuilding, automobile and aircraft construction, apparatus and tank construction, etc.
Liquid penetrant inspection can be carried out with at daylight visible (red dye penetrant) and/or under UV-light fluorescent penetrants.
The PT method is characteristic for the fact that, contrary to the magnetic particle inspection (MT), defects or discontinuities can be proven also on not magnetizable material.
The testing procedure consists of four separate processing steps, for which the following products are necessary:
- Precleaning (MR® Remover)
- Application of penetrant (MR® Penetrant)
- Excess penetrant removal (MR® Remover or water)
- Application of developer (MR® Developer, white)
2. MPI (Magnetic Particle Inspection)
Magnetic particle inspection is suitable for detecting discontinuities (e.g. cracks) in or near the surface of ferromagnetic materials.
The workpiece must be magnetized in the test area. The discontinuity can be shown best if the magnetic field is vertical to the discontinuity. One possible method for magnetization is using a yoke. The magnetic flux flows into the workpiece through a ferromagnetic yoke. The main field direction is the connection line between the two poles of the yoke. Yokes can be installed in a test bench so that the whole material can be magnetized. If hand yokes are used only the region between the two poles can be magnetized. Multi-directional magnetization can be used to find discontinuities in any direction.
There are various types of detection media: a suspension of coloured (including black) or fluorescent particles in a carrier fluid (based on water or oil), or dry powders. Fluorescent media usually gives the highest sensitivity.
The test area can be sprayed with a dry magnetic powder, or the workpiece can be dipped into a container in which the particles are kept afloat by air whirling (eddy pot procedure). The dry testing is recommendable where a wetting of the surface must be avoided, or with the examination of hot parts.
The magnetic powder is suspended in a carrier fluid. The particle size of the powder is smaller so that smaller discontinuities may be detected.