Visualisation of Corrosion Acoustic Signals Using Quality Tools

Abstract

The article deals with the application of chosen quality tools for visualisation of acoustic signals from corrosion process. For continuous monitoring of corrosion the acoustic emission (AE) is used. This is one of the non-destructive testing methods. Using this method it is possible to receive signals and perform basic analysis. For a thorough prediction of process conditions or degradation is necessary to combine this method with other analyzes in the fi eld of statistics, especially quality tools. For these purposes, the control charts are used in this work. Eff ective prediction of corrosion status of the material is very important with regard to damages caused by corrosion worldwide. The objective of this paper is to describe the possibility of signal analysis in Minitab program, where is possible to continuously produce qualitative evaluation by means of quality tools, in this case control charts. The control chart is one of the seven basic tools of quality control. Typically control charts are used for time-series data, though they can be used for data that have logical comparability. This work demonstrates the possibility of use this quality tool for the analysis of corrosion acoustic signals.

Acoustic Emission of Corroded Weldments During Tensile Test

“…As reported in the literature [1] and [2] acoustic emission records are directly correlated with the formation of micro-cracks in the internal structure of the material. High voltage of RMS means creation of microcracks before the final break.…”

“…The method utilised in fusion welding is mixing the base and the added metal so that by the subsequent recrystallisation of the weld metal they form a weld. Local fusion is achieved, for example, by means of a flame or by electric resistance [1,2,3]. The weldability of the material plays a very important role.…”

The Acoustic Emission for Monitoring the Hardness of the Cold Metal Transfer Weld

“…The diagram 1 shows high acoustic emission intensity. (Horák et al, 2010;Dostál et al, 2014). The value of maximum RMS takes 160 mV in this section.…”

Verification of the Quality of the Weld When Utilising the MAG/CO₂ Method

“…The time-frequency response of the AE signal is not evaluated in detail. Each structure and each body has an acoustic background, which manifests as a continuous noise background (Dostál, Communeau, 2014).…”