The differences between the strengths of quality levels of weld imperfections given in ISO 5817

• Autorzy: Vural M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: ISO 5817 “Arc-welded joints in steel-Guidence on quality levels for imperfections” is a widely used international standard for evaluating of the weld imperfections in arc welded joints. In this study, in order to see the differences between the quality levels given in ISO 5817, the welded joints of B, C and D levels are subjected to the same load and the differences of maximum stresses at the joints are analysed by FEM. Design/methodology/approach: The welded joints with the quality levels of the weld imperfections given in ISO 5817 are modeled by a Solidworks FEM program, and they are subjected to static loading in order to determine the maximum stresses at the cross-sections of the joints. Findings: The stress values at the welded joints generally increases from the quality level of “B” to “D”. Exceptions of this behavior are the imperfections defined as “fillet welds having the throat thickness greater than nominal value”, “excessive penetration” and “excessive asymmetry fillet weld”. In these imperfections, the cross-sections carrying the force increases from “B” to “D”. Because of static force, a greater cross-section forms a smaller stress value. Thus, it must be given in the ISO 5817 whether the welded joint is subjected to a static or dynamic load. Research limitations/implications: Three dimensional models can be investigated and the effect of 3D weld imperfections on the behavior of a more realistic model can be calculated. Practical implications: The results show that some imperfections like “excessive penetration” and “excessive asymmetry filet weld” have less importance compared to the others. Originality/value: ISO 5817 is a worldwide used Standard for evaluating the weld imperfections. The quality levels of weld imperfections are compared with each other with FEM. The Standard includes 57 different quality levels and this paper compared all these levels with each other.

Słowa kluczowe

EN

weld imperfections; quality level; ISO 5817; finite element method; static loading

PL

niedoskonałości spoiny; poziom jakości; ISO 5817; metoda elementów skończonych; obciążenie statyczne

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 15, nr 1-2
• Strony: 193--198
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Vural M.

• Faculty of Mechanical Engineering, Istanbul Technical University, Gumussuyu, Istanbul, Turkey

Bibliografia

• [1] ISO 5817: 2003, “Arc-welded joints in steel, nickel and nickel alloys, titanium and titanium alloys (except electron beam welds) – Guidance on quality levels for imperfections,
• [2] ISO 6520, 1982, “Classification of imperfections in metallic fusion welds, with explanations”.
• [3] Carosena Meola, Antonino Squillace, Fabrizio Memola Capece Minutolo and Renata Erica Morace, Analysis of stainless steel welded joints: a comparison between destructive and non-destructive techniques , Journal of Materials Processing Technology, Volumes 155-156, 2004, Pages 1893-1899
• [4] Jerzy Nowacki and Paweł Rybicki , The influence of welding heat input on submerged arc welded duplex steel joints imperfections, Journal of Materials Processing Technology, Volumes 164-165, 15,2005, Pages 1082-1088
• [5] P.K. Palani and N. Murugan Selection of parameters of pulsed current gas metal arc welding, Journal of Materials Processing Technology, Volume 172, Issue 1, 2006, Pages 1-10,
• [6] ISO 4063: 1990, “Welding, brazing, soldering and braze welding of metals-Nomenclature of processes and reference numbers for symbolic representation on drawings”.
• [7] ISO 2553: 1984, “Weld-Symbolic representation on drawings”
• [8] Cosmosworks program manual.