Hot eddy current flaw detecting method of steel material

Abstract

Abstract PURPOSE:To ensure the flaw detection of a steel material even within a range of temperatures including a magnetic transformation region, by securing such structure of a coil in which the main components of the eddy currents caused to a steel material to be detected are set in the same direction when a detecting coil is energized. CONSTITUTION:A detecting coil is formed by winding linearly the lead wires on the opposite surfaces of a steel material to be detected in the same direction and so that the main components of the eddy currents are set in the same direction. With use of such coil, the output voltage is stabilized over the entire range of temperature excluding a magnetic transformation region. Thus the signal waveforms S'1 and S'2 corresponding to the flaws are clearly distinguished from the signal waveforms in the magnetic transformation region.

Inventors

• 👤 Teruhisa Komori
• 👤 照久 小森
• 👤 Takao Sugimoto
• 👤 隆夫 杉本
• 👤 Mitsuhiro Ota
• 👤 大田　光廣

Bibliographic Details