Some investigations on microstructure and mechanical properties of submerged arc welded HSLA steel joints

Prasad, K. Sajun; Dwivedi, Dheerendra Kumar

doi:10.1007/s00170-006-0855-1

Cited by 116 publications

(53 citation statements)

References 11 publications

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“…It is reported that the increase in acicular ferrite phase in the weld pool would enhance the weld joint Charpy impact toughness. Prasad et al 19) investigated the influence of the SAW process parameters on the mechanical properties of HSLA steel welds. The weld joints were prepared at different heat inputs between 大韓熔接․接合學會誌第32卷第3號, 2014年 6月 219 Fig.…”

Section: Experimental Studies 21 Variants Of Saw Processmentioning

confidence: 99%

Experimental Studies on Submerged Arc Welding Process

Kiran¹,

Na²

2014

Journal of Welding and Joining

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The efficient application of any welding process depends on the understanding of associated process parameters influence on the weld quality. The weld quality includes the weld bead dimensions, temperature distribution, metallurgical phases and the mechanical properties. A detailed review on the experimental and numerical approaches to understand the parametric influence of a single wire submerged arc welding (SAW) and multi-wire SAW processes on the final weld quality is reported in two parts. The first part deals with the experimental approaches which explain the parametric influence on the weld bead dimensions, metallurgical phases and the mechanical properties of the SAW weldment. Furthermore, the studies related to statistical modeling of the present welding process are also discussed. The second part deals with the numerical approaches which focus on the conduction based, and heat transfer and fluid flow analysis based studies in the present welding process. The present paper is the first part.

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Section: Experimental Studies 21 Variants Of Saw Processmentioning

confidence: 99%

Experimental Studies on Submerged Arc Welding Process

Kiran¹,

Na²

2014

Journal of Welding and Joining

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“…A literatura (6,7,13,18) registra que a diminuição da taxa de resfriamento, pelo aumento do aporte térmico ou do preaquecimento em metais de solda de aço C-Mn baixa liga, provocam uma queda da tenacidade ao impacto, devido à mudança microestrutural ocasionada pela diminuição contínua da proporção de ferrita acicular, notadamente para aportes térmicos superiores a 5,0 kJ/mm. (6) No caso do presente trabalho, tal fato também é verificado.…”

Section: Ensaios De Impacto Charpy-vunclassified

“…Embora a literatura registre estudos (1)(2)(3)(4)(5)(6)(7) evidenciando que metais de solda produzidos em soldagens com elevado aporte térmico exibem uma tendência para redução da tenacidade ao impacto, Prasad e Dwivedi (7) comentam que existem poucos estudos recentes abordando a influência de elevados aportes térmicos no comportamento de juntas soldadas realizadas pelo processo a arco submerso Destacam apenas o trabalho de Viano, Ahmed e Schmann, (6) que produziram juntas com aportes térmicos até 10 kJ/mm. Isto impõe limitações em suas aplicações, devendo ser objeto de análises mais detalhadas.…”

Section: Introductionunclassified

ESTUDO DO APORTE TÉRMICO NAS PROPRIEDADES MECÂNICAS DE METAIS DE SOLDA DE AÇO C-Mn OBTIDOS PELO PROCESSO ARCO SUBMERSO

Marouço¹,

Diniz²,

Santos³

et al. 2013

TMM

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ResumoO presente trabalho faz parte de um programa de pesquisas que tem por objetivo a avaliação da viabilidade técnica do aumento de produtividade na fabricação de componentes tubulares utilizados no segmento offshore, soldados integralmente pelo processo a arco submerso automatizado com elevado aporte térmico, sem prejuízo da tenacidade ao impacto do metal de solda. Foram soldadas juntas multipasse, pelo processo a arco submerso com combinação de arame/fluxo do tipo F7A4-EM12K com arame de 3,2 mm de diâmetro, com preaquecimento de 80°C, corrente contínua, posição plana e aporte térmico variando de 3,5 kJ/mm até 12 kJ/mm. Após a soldagem, realizaram-se ensaios de tração, impacto Charpy-V às temperaturas de -60°C, -40°C, -20°C, 0°C e 20ºC e metalográficos pelas técnicas de microscopia óptica (MO) e de microscopia eletrônica de varredura (MEV) em corpos-de-prova retirados integralmente do metal depositado, objetivando a avaliação da relação tenacidade/microestrutura. Foi verificado que os metais de solda obtidos mostraram níveis de tenacidade superiores aos mínimos requeridos para a utilização na soldagem de aços C-Mn baixa liga com requisitos de tenacidade ao impacto de 27 J a 0ºC, para aportes térmicos até 12 kJ/mm. Desta forma é possível um aumento de produtividade de 58% nos tempos efetivos de fabricação. Palavras-chave: Metal de solda; Tenacidade; Processo arco submerso; Produtividade. STUDY OF THE INFLUENCE OF THE HEAT INPUT ON MECHANICAL PROPERTIES OF C-Mn STEEL WELD METALS OBTAINED BY SUBMERGED ARC PROCESS AbstractThe present work is part of a research program that aims to evaluate the technical feasibility of increasing productivity in the manufacturing of tubular components for offshore oil industry, which are fully welded by automatic submerged arc welding process, with high heat input, but with no impairment on the impact toughness of the weld metal. Multipass welds were produced by the submerged arc welding process, with a combination of F7A4-EM12K (wire/flux), by using a 3.2 mm-diameter wire, preheating at 80°C, with direct current, in flat position, with heat input varying from 3.5 kJ/mm to 12 kJ/mm. After welding, tensile tests and Charpy-V impact tests at -60°C, -40°C, -20°C, 0°C and 20°C were carried out, as well as metallographic examination by both optical (OM) and scanning electron microscopy (SEM), of specimens obtained entirely from the weld metal, allowing the discussion over the toughness X microstructure relationship. The weld metals have shown higher toughness levels in relation to the minimum required for use with low-alloy C-Mn steels welding with requirements of impact toughness of 27 J at 0°C for heat input up to 12 kJ/mm allowing an increase in productivity of 58% on the effective manufacturing time.

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“…Especially, HSLA steels are used in the plants and structures on severe environmental conditions such as the ocean because it necessitates the use of anticorrosive steels to retard corrosion. [1][2][3] A water ballast tank is a compartment lled with ballast water in ship, boat and marine construction manufactured by HSLA steel with thermo-mechanical control (TMCP) process. The tank is essential to maintain ship s balance under different operation systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Molybdenum on the Corrosion of Low Alloy Steels in Synthetic Seawater

et al. 2016

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The alloying effect of Mo on the seawater immersion corrosion for low alloy steel was investigated using weight loss tests and electrochemical impedance spectroscopy (EIS) in seawater. The Mo-containing low alloy steel showed an excellent corrosion resistance by the long immersion test due to the formation of homogeneous rust layer preventing active dissolution. SEM and XPS analyses were conducted to observe cross-sectional images of rust layer and indentify chemical composition of oxide formed on the surface after immersion test. The results revealed that the MoO 4 2− ions which were oxidized from Mo form the compounds which disturb the approach of aggressive ions.

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Some investigations on microstructure and mechanical properties of submerged arc welded HSLA steel joints

Cited by 116 publications

References 11 publications

Experimental Studies on Submerged Arc Welding Process

Experimental Studies on Submerged Arc Welding Process

ESTUDO DO APORTE TÉRMICO NAS PROPRIEDADES MECÂNICAS DE METAIS DE SOLDA DE AÇO C-Mn OBTIDOS PELO PROCESSO ARCO SUBMERSO

Effect of Molybdenum on the Corrosion of Low Alloy Steels in Synthetic Seawater

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