Magnetic control of welds

Magnetic flaw detection is a check of the condition of equipment made of ferromagnetic materials. This flaw detection method is based on the ability of tension lines to change their trajectory when they collide with a defect in the metal. A huge advantage of the method is a reliable determination of the exact localization of both a surface defect and an internal one. Among non-destructive testing methods, magnetic flaw detection occupies a special place; with its help, unacceptable flaws on the surface of ferromagnetic materials are easily detected.

Magnetic control is successfully used to diagnose the quality of pipelines, welded joints and other parts made of ferromagnetic materials. During the inspection, objects are checked for the presence or absence of pores and cracks in the material. You can also check the material for fatigue, for corrosion. Very often, a reliable determination of superficial and deeper defects is possible only when using this diagnostic method.

Control methods

Magnetic particle

The essence of the method: a fine powder or emulsion is sprinkled on the surface of the tested area of ​​the product, then this area is magnetized. If a defect exists, the powder accumulates directly above it. Thus, you can get a reliable visual picture of any defect. The method is most sensitive to structural changes in the metal. Using this method of diagnosing pipes and welded joints, it is possible to detect even the smallest defects that are difficult to detect in other ways.

Induction method

The essence of the method: the tested area is magnetized and the fluxes over the defects are fixed with the help of an induction coil. Such control is used to diagnose products of small thickness.

magnetic graphic

The essence of the method: the area to be checked is magnetized and a magnetic tape is used to fix the flows. The method allows you to check the condition of products, the thickness of which does not exceed 2 cm.

Magnetic flaw detection is applicable when checking products made from the following metals:

• iron;
• nickel;
• cobalt.

A great advantage of this control is the ability to diagnose equipment without damaging it. It is noteworthy that the verification does not require the involvement of bulky, inconvenient equipment. The verification procedure is quite simple, thanks to which it is used in both small and large workshops.