Phase Angle Shift
The phase angle shift is the time shift between excitation current and induced voltage in eddy current testing. It helps in separating different materials.
Physical-Chemical Mechanism of Action
The phase angle shift arises from the time shift between the excitation current and the induced voltage in a magnetic field. This phase shift is a measure of the material's electrical conductivity.
Metallurgical Relevance & Welding Risks
The phase angle shift is used to distinguish different materials and characterize their properties. Inaccurate measurements can lead to errors in material identification, which can affect quality assurance in welding.
Workshop Practice & Instructions
To measure the phase angle shift accurately, the measuring device should be correctly calibrated and the excitation current stable. The shift is measured in degrees and should show a unique pattern for each material.