Analysing the reliability of working parts operating in abrasive soil pulp taking into consideration confounding factors

This paper refers to the aspects of wear in structural materials used for the manufacture of working parts operating in abrasive soil pulp. Our study was conducted on six steel grades: Hardox 500 and Hardox 600, XAR 600, TBL Plus, B27 and 38GSA, 13 pad-welded layers and two types of carbide-based layers. The results obtained were used to analyse reliability and durability in terms of meeting the assumed abrasive wear limits. Analytical tools employed included multi-dimensional analyses, such as cluster analysis, correspondence analysis, and comparative analysis in a function of reliability with the use of the Mantel-Haenszel test. The latter method was used to study the influence of a confounding factor (change of the soil pulp type) on the reliability of the models determined.