ELECTRICAL CONTROL

Electrical control (EC) is one of the types of non-destructive testing (NC), which is based on the registration and determination of parameters of electric fields interacting with objects of control (OK), or arising in them when exposed to external forces. The EC methodology and its varieties are regulated by the GOST 25315-82 standard.

EC methods can be used to identify various defects in OCS: cracks and other irregularities in products made of ferrous and non-ferrous metals, as well as alloys; in insulating coatings: pores, delaminations, blisters, looseness, cracks, thinning. These methods make it possible to determine the thickness of extended products (rods, pipes, rods, tapes, threads) made of conductive and non-conductive materials. Indirectly, using EC, it is possible to determine the physical and mechanical characteristics of many materials: density, humidity, degree of polymerization, radio transparency, percentage of components in heterogeneous systems, etc.

The electric spark control method is mainly used to detect defects in dielectric control objects and protective insulating coatings of electrically conductive control objects. The method is based on the registration of an electrical breakdown of a section of such a coating, or the dielectric object itself.

During the inspection of insulation coatings, a test voltage is applied to the electrically conductive base of the inspection object and a special electrode that scans this coating. When monitoring dielectric objects, voltage is applied to the electrodes located on both sides of the control object.