Controlling Direct Current Flow by Local Heating for Sensitive Detection of a Crack on the Back Wall of a Thick-Walled Structure

Abstract

This paper focuses on a way to control direct current flow in a thick-walled structure. We locally heat a part of the surface of a thick-walled pipe for controlling the direct current flow, which will be led to the back wall of the pipe, and sensitively detect an artificial slit on the inner surface of the pipe by means of the direct current potential drop technique.