Influence of welding procedure and PWHT on HSLA steel weld metals

Jorge, Jorge Carlos Ferreira; Monteiro, Joel Lemos Dias; Gomes, Antonio José de Carvalho; Bott, Ivaní de Souza; Souza, Luís Felipe Guimarães de; Mendes, Matheus Campolina; Araújo, Leonardo Sales

doi:10.1016/j.jmrt.2018.05.007

Cited by 44 publications

(41 citation statements)

References 35 publications

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“…In this paper, we achieved a similar tempering effect of the structures in HAZ. Jorge et al [54] proved that longer cooling times show a tendency to improvement of impact toughness of high-strength steel weld metals obtained by GMAW process. It can be assumed that our technique would also improve the mechanical properties.…”

Section: Metallographic Microscopic Testingmentioning

confidence: 99%

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Tomków

Janeczek

2020

Applied Sciences

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In this paper the influence of in situ local heat treatment performed by additional stitches on the weldability of high-strength low-alloy (HSLA) S355J2C+N steel was tested. The investigated steel is characterized by high susceptibility to cold cracking. It is necessary to find a method to improve the quality of welded joints. The local heat treatment was applied as an effect of bead-on plate welding made on the face of a Tekken test joint. The specimens were made by the use of covered electrodes in the water environment. For testing weldability, Tekken test specimens were made. Then, the different number of the pad welds with different overlapping were laid on the face of the tested welds. Non-destructive (NDT) visual and penetrant tests were undertaken. During the NDT, imperfections like shape mistakes and spatters were found. Then, metallographic macro- and microscopic testing were performed. The macroscopic observations proved that water environment can generate imperfections like cracking and pores. However, for specimens with additional stitches the number of imperfections decreased. Microscopic tests proved that the proposed technique affected the structure of the heat-affected zone (HAZ). The specimens without the application of additional stitches are characterized by brittle bainitic and martensitic structure. Specimens, in which the additional stitches were applied, contain tempered martensite, fine ferrite and fine pearlite in their HAZ. It was also observed that the number of cracks decreased for in situ local heat-treatment specimens. The final step was Vickers HV10 hardness measurement. These measurements confirmed previous results. The heat from additional stitches affected the steel by significantly decreasing the hardness by 80–100 HV10. The results of experiments showed that the heat from pad welds provided microstructural changes in heat-affected zones and a decrease in the susceptibility to cold cracking, which results in improvement in the weldability of HSLA steel in wet welding conditions.

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Section: Metallographic Microscopic Testingmentioning

confidence: 99%

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Tomków

Janeczek

2020

Applied Sciences

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“…Segundo Myers [30] a taxa de deposição para o processo GMAW utilizando um arame sólido de 1,2 mm de diâmetro varia de 3,6 a 4,5 kg/h. Como observado na Tabela 3, os valores obtidos no presente trabalho situam-se dentro destes limites para ambos os processos, estando de acordo com outros trabalhos experimentais [30][31][32][33][34][35]. Embora a taxa de deposição média observada com o processo GMAW seja inferior ao do processo GMAW-RE, deve-se destacar que este resultado é consequência da contribuição do passe de raiz, visto que os passes de enchimento e acabamento apresentaram resultados similares (Tabela 2).…”

Section: Produtividadeunclassified

Comportamento de Juntas Soldadas de Aço C-Mn Obtidas Pelo Processo GMAW-RE com Eletrodo Rotativo

et al. 2019

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Resumo O presente trabalho tem como objetivo estudar o comportamento de juntas soldadas obtidas pelo processo GMAW com eletrodo rotativo (GMAW-RE), de modo a permitir uma análise comparativa de produtividade e propriedades mecânicas com o processo GMAW convencional (GMAW). Foram realizadas soldagens multipasse pelos dois processos GMAW com preaquecimento de 100 °C em chapas de dimensões 500 × 150 × 10 mm em aço ASTM A36, na posição plana e energia de soldagem média de 2,30 kJ/mm. Após a soldagem, foram realizados ensaios de impacto Charpy-V, microdureza e metalográficos em corpos-de-prova removidos transversalmente ao cordão de solda. Adicionalmente, foi realizada uma análise comparativa de produtividade entre os processos. Os resultados mostram que o processo GMAW-RE propicia um aumento de produtividade e redução de custos significativos em relação ao processo GMAW. Adicionalmente, foram observados valores equivalentes de tenacidade ao impacto para o metal de solda, mas uma redução nesta propriedade na zona termicamente afetada. Embora a literatura disponível destaque o elevado potencial deste processo para substituição do processo GMAW convencional em aplicações industriais, verifica-se a necessidade de mais evidências experimentais para um maior suporte a esta indicação.

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“…For instance, Ozdemira et al (2007) found that higher welding speed can be used to improve the interface characteristics of dissimilar weldments of AISI 304 L and AISI 4340 steels. Shielded metal arc welding technique (SMAW), due to its flexibility and cost effectiveness, is preferably used for joining dissimilar welds of stainless steels to other metals in recent years (Jorge et al, 2019). Therefore, this research presented study on dissimilar weld joint of austenitic stainless steels (ASS) and high strength low alloy (HSLA) steel welded by SMAW process using varying welding electrodes.…”

Section: *Corresponding Authormentioning

confidence: 99%

Evaluation of Microstructure and Impact Toughness of Shielded Metal Arc Dissimilar Weldments of High Strength Low Alloy Steel and Austenitic Stainless Steel

Hayatu¹,

Dauda²,

Aponbiede³

et al. 2020

FUOYEJET

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There is a growing interest for novel materials of dissimilar metals due to higher requirements needed for some critical engineering applications. In this research, different dissimilar weld joints of high strength low alloy (HSLA) and 316 austenitic stainless steel grades were successfully produced using shielded metal arc welding (SMAW) process with 316L-16 and E7018 electrodes. Five variations of welding currents were employed within the specified range of each electrode. Other welding parameters such as heat inputs, welding speeds, weld sizes, arc voltages and time of welding were also varied. Specimens for different weld joint samples were subjected to microstructural studies using optical and scanning electron microscopes. The impact toughness test was also conducted on the samples using Izod impact testing machine. The analysis of the weld microstructures indicated the presence of type A and AF solidification patterns of austenitic stainless steels. The results further showed that the weld joints consolidated with E7018 electrode presented comparatively superior impact energy to the weldments fabricated by 316L-16 electrode. The optimum impact energy of E7018-weld joints (51J) was attained at higher welding heat inputs while that of 316L-16-weld joints (35J) was achieved at lower welding heat inputs, which are necessary requirements for the two electrodes used in the experiment. Hence, the dissimilar weld joints investigated could meet requirement for engineering application in offshore and other critical environments.Keywords—Dissimilar metal weld, heat input, impact toughness, microstructures

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Influence of welding procedure and PWHT on HSLA steel weld metals

Cited by 44 publications

References 35 publications

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Comportamento de Juntas Soldadas de Aço C-Mn Obtidas Pelo Processo GMAW-RE com Eletrodo Rotativo

Evaluation of Microstructure and Impact Toughness of Shielded Metal Arc Dissimilar Weldments of High Strength Low Alloy Steel and Austenitic Stainless Steel

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