Investigation of a Camshaft Repaired by Welding Using the Vibration Signal Analysis

Abstract

Metallic materials are subjected to degradation mechanisms when working in corrosive environments, such as those created by mineral oils and residues of a motor fuel. The camshaft is subjected to multiaxial stresses, creep, fatigue, corrosion and abrasion. As a result of the operation in special conditions of high temperature and high pressure can lead to forming cracks, damages or failure. In such cases it is necessary for these components to be repaired by welding, followed by a rectification process. This paper presents a method for determining the quality of welding repairs and rectification results from the analysis of vibration signals. A Fast Fourier Transform algorithm and an algorithm based on Prony's series method are used for processing the sampled signals.