Eddy Current Testing (ECT) is a nondestructive examination (NDE) technique that is used in the detection of damage or corrosion in non-ferrous materials. It uses a process known as electromagnetic induction. When an alternating current is applied to a conductor a magnetic field forms around it, increasing and decreasing in size based on the amount of current applied. When this conductor is brought into range of another conductor a current will be induced the second conductor as well.
ECT works by sending a current through a wire coil known as an eddy current probe, which creates an oscillating magnetic field. This probe is then brought close to the material to be tested at which point the a circular flow of electrons, known as an eddy current (from which eddy current testing takes it’s name), will circle between the two pieces of metal. This gives the piece of equipment being examined its own magnetic field, which will interact with the probe’s field through mutual inductance. Any defects or changes in the thickness of the metal will disrupt the eddy current and magnetic field, which can be measured and used to find these flaws.
ECT has many advantages and applications in the oil & gas industries. This type of testing can be used both measuring the thickness of metals and detecting corrosion. It’s primary application is the examination of tubing in bundles such as heat exchangers, chillers, etc,
Eddy current testing is an advanced NDE technique that demands a high level of expertise. Hi-Tech Testing’s staff of technicians and its advanced equipment can provide eddy current testing in a way that meets all code, standard and specification requirements. Contact us to learn more about our ECT services.