Development of the automatic method of detection and grouping of external welding imperfections

Brzeskot, P; Łatka, Leszek

doi:10.1088/1742-6596/2412/1/012012

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…The PN-EN ISO 6520-1:2009 standard classifies geometric welding imperfections in metals, dividing them into 6 groups: 1 -cracks, 2 -cavities, 3 -solid inclusions, 4 -lack of fusion and penetration, 5 -imperfect shape and dimensions, 6 -miscellaneous imperfections [18]. All welding imperfections not included in groups 1 to 5 are miscellaneous.…”

Section: Introductionmentioning

confidence: 99%

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

Fydrych,

Raczko,

Świerczyńska

et al. 2023

Adv. Sci. Technol. Res. J.

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Wet welding with covered electrodes (Shielded Metal Arc Welding -SMAW) is the most commonly used method of carrying out welding repair works in a water environment. Limited visibility and the inability to move freely under water result in an increased risk of formation of welding imperfections such as lack of fusion, lack of penetration and arc strikes. The work focused on changes in the properties and structure of steel subjected to the impact of short (0.2 s) arc ignitions generated by covered electrodes in air and under water for three high strength steel grades: S460N, S460M and S500MC. Visual tests, macroscopic and microscopic metallographic tests, microhardness measurements and diffusible hydrogen content in deposited metal determination were performed. A significant influence of the environment on changes in the morphology and microhardness of steel in the vicinity of arc strikes was found. The microhardness of the areas covered by the rapid thermal cycle caused by SMAW increased from 200-230 HV0.5 to 400-500 HV0.5 depending on the steel grade. The presence of welding imperfections: cavities and cracks were detected. The susceptibility of all steel grades subjected to short thermal cycles to cracking was confirmed by the results of measurements of the diffusible hydrogen content: 38.6 ml/100 g and 84.5 ml/100 g for air and water environment, respectively. No influence of changes in the welding current on the behavior of the material in the tested conditions was found. The conducted research shows that leaving arc strikes on the structure may have serious consequences and cause a failure.

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Section: Introductionmentioning

confidence: 99%

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

Fydrych,

Raczko,

Świerczyńska

et al. 2023

Adv. Sci. Technol. Res. J.

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“…To identify possible imperfections in the welded joint, non-destructive testing (NDT) can be used without damaging the integrity of the structure [2]. Another possibility to asses the quality and integrity of the welded structure is to use a series of quality tools, of which seven are considered to be basic.…”

Section: Introductionmentioning

confidence: 99%

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

Pirvu,

Cicic,

Rontescu

et al. 2023

IJMMT

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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.

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