Magnetic control method
Today, a reliable determination of surface and deeper defects is possible with the help of magnetic flaw detection. Special devices used for testing allow determining the relative values of the magnetic properties of the controlled objects in a wide range of their changes. The whole procedure is carried out quite quickly and does not require the involvement of too bulky equipment, therefore, it is especially in great demand among manufacturing companies, for which usually every working minute is worth its weight in gold.
There are several methods of magnetic control, each of which has its own characteristics and advantages.
Metal magnetic memory control
This method is based on the use of irreversible changes in the magnetic state of ferromagnetic materials in the zone of stress and strain concentration. The essence of such control is the reading of the product’s stray magnetic field.
Advantages of the method:
- Does not affect the state of the material during the determination process;
- No magnetizing devices are used;
- Surface preparation is not required;
- Reliable determination of the degree of “contamination” of welds with defects;
- Accurate assessment of the distribution of residual stresses;
- Quality and efficiency of measurement technique.
Magnetic particle control method
Magnetic powder is used here as an indicator, which makes it possible to detect even the smallest defects that are difficult to detect in other ways.
Advantages of the method:
- Low labor intensity;
- High performance;
- Reliable detection of superficial and deeper defects.
Using the magnetic method of non-destructive testing, the entire flaw detection procedure takes much less time than with many other options. In addition, it is possible to detect a large number of defects that are difficult to detect in other ways and are completely impossible to notice with the naked eye. Timely flaw detection can save your company from unpleasant force majeure, as well as financial and health risks for your employees.