Abstract
This paper presents the results of the quality evaluation of the weld joints on welded pipes used in industrial energy. The quality evaluation of the weld joints was performed by two methods. Using technical methods, welding faults and defects were examined, identified and evaluated by a metallographic analysis on the macrostructure of welds. According to ISO 6520-1:2007, the faults and defects were detected and classified into the group and classified into quality levels using ISO 5817:2008-03. Two quality management tools using a Cause and effect diagram - Iskihawa diagram and a Pareto diagram also evaluated the quality control of welds. These two tools enabled to identify the causes of welding defects as well as to determine the frequency of their occurrence and to identify the most serious welding faults and defects. Both methods - technical and management, should reveal shortcomings in both technical, technological and personnel aspect. Their use should contribute to improving the welding process of pipes in operation and to increasing the safety of piping systems.
Highlights
The term product quality is said to be the oldest economic, and technical and technological category
We focused on the evaluation of internal defects on prepared sections of the weld joints by metallographic analysis – Macroscopic examination
The combination of various methods for evaluating the quality of the weld joints of the pipes was to reveal the causes of failures and defects and offer solutions to increase the quality of the weld joints
Summary
The term product quality is said to be the oldest economic, and technical and technological category. Quality is a term for products characteristics, and for the people who create this product and use it correctly in practice [1]. The quality of weld product should not be limited to its final inspection, but it should include all process proposals [2] and production strategies [3]. According to the authors [1,2,3,4], the product price consists of a combination of several different items. Time needed for an adequate control of the product can be one of the most significant items, which can get expensive. It is necessary to ensure control of the whole process
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