Improving the non-destructive test by initiating the quality management techniques on an example of the turbine nozzle outlet

Abstract

The NDT methods are an effective way to make a quality analysis of the product, mainly in the case of the aviation industry. However, although these studies effectively identify unconformities, they do not indicate the source of their occurrence. The aim was to analyze the quality of the product (turbine nozzle outlet) using the fluorescent method and identify the root of the unconformity by using the quality management technique sequence. The Ishikawa diagram and the 5Why method were the techniques used in the study and the turbine nozzle outlet made from 410 steel was its subject. The product using the fluorescent method was analyzed, after which the unconformity was identified (porosity cluster). By using the Ishikawa diagram, the potential causes were identified, from which two main causes were selected (molding sand and errors during production). The 5Why method was used, by means of which the root cause was identified-it was a faulty material form a supplier. On the example of the fluorescent method, it was shown that using the non-destructive test (NDT) in a sequential way with quality management techniques (Ishikawa diagram and 5Why method) allows for making a complex quality analysis of the product and identifying the root of eventual unconformity. The proposed technique sequence (fluorescent method, Ishikawa diagram and 5Why method) can be applied to analyze other products and other unconformities in production and service enterprises.