Analysis of the Interdependencies Between Imperfections and Risks in the Field of Welded Structures Manufacturing

Abstract

A modern, highly industrialized society cannot be achieved without having welded products as a basis for various industries such as food, medical, energy etc. By its nature, the welding process, considered as a special technological process, can lead to the appearance of imperfections that can negatively influence the behavior in operation. The paper aims to identify the interdependencies between imperfections and risks starting from the statistics obtained as a result of the quality examination of welded products, manufactured in an organization producing welded structures in the naval field, for a two-month period. Starting from an analysis using the Ishikawa method, causes and sub-causes leading to a reduced quality of welded joints were identified. The type of imperfections detected in over 20% of the examined products were pores, lack of melting and slag inclusions. For each type of imperfection, the risks and causes favoring the occurrence were identified, followed by the calculation of the inherent risk and a series of risk management actions. With the help of the Pareto analysis, the type of imperfection with the largest share was identified, which decisively influences the quality of the welded joints and, for which, immediate measures must be taken to reduce/eliminate it. The results obtained are presented in tabular and graphic form for easy understanding of the information presented.