Conductivity test

This article deals with conductivity measurements for material testing, especially of metals; For other aspects, see electrical conductivity or conductivity meter .

The conductivity test is a method of non-destructive material testing, especially of metals.

The purpose of this test method is to discover crystal structure defects and impurities that can undesirably change the workpiece in terms of its desired properties (hardness, elasticity, electrical conductivity ). To do this, the electrical or thermal conductivity is measured .

principle

The electrical conductivity is formed from the reciprocal value of the specific resistance. In the case of metals, there is an almost linear relationship between thermal conductivity and electrical conductivity. Inclusions in the workpiece change the conductivity, as the mobility of electrons is hindered by crystal disturbances and grain boundaries as well as dissolved foreign matter. For pure metals such as B. Copper, the effect is particularly pronounced - even minor impurities in the form of dissolved substances reduce the conductivity significantly, see also electrolytic copper .

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application

• In the electrotechnical industry in particular, these parameters are decisive for the purity of the substances, since conductivity is essential for subsequent processing.
• In materials testing, too, you can experience a certain degree of security through the presence or absence of inclusions.