Microstructure and Mechanical Properties of Narrow Gap Laser-Arc Hybrid Welded 40 mm Thick Mild Steel

Zhang, Chen; Li, Geng; Gao, Ming; Zeng, Xiaoyan

doi:10.3390/ma10020106

Cited by 39 publications

(24 citation statements)

References 19 publications

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“…No caso presente, como se trata de um aço C-Mn de baixa temperabilidade, os constituintes microestruturais presentes em ambas as juntas são os esperados para um aço C-Mn, somente diferindo no tamanho de grão em função do ciclo térmico experimentado por cada um. O efeito do reaquecimento pelos passes posteriores se traduz em um refino microestrutural e ocorrência preponderante de ferrita e carbetos na região central (Figura 7), todas estas evidências estando de acordo com outros trabalhos experimentais [38][39][40][41][42][43].…”

Section: Propriedades Da Junta Soldadaunclassified

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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Section: Propriedades Da Junta Soldadaunclassified

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

et al. 2019

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“…In the process of HLDAW, the liquid metal flow in the molten pool was different from that of DAW because of the addition of the laser, as shown in Figure 10b. The depression of the weld pool surface becomes larger because of the laser beam and transforms to a keyhole, the entire central core of which consists of vapor surrounded on all sides by an envelope of liquid metal [28]. The reaction force produced by vapor ejected upward from the keyhole facilitates the molten metal flowing toward the bottom of the molten pool.…”

Section: Resultsmentioning

confidence: 99%

Physical Characteristics of Coupled Plasma and Its Influence on Weld Formation in Hybrid Laser-Double-Arc Welding

Liu

et al. 2019

Materials

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Hybrid laser-double-arc welding (HLDAW) is an efficient welding method with multi-heat sources comprised of two arcs and a laser beam, which is an intricate process with much randomness and uncertainty due to the mutual effect between multi-plasmas. Compared with double-arc welding (DAW), HLDAW can generally obtain a more stable welding process and deeper weld penetration, which is directly affected by the synergistic effect of multiple heat sources; however, the mechanism has not been systematically studied. In this study, the multi-information analysis method is adopted to study the distribution of electron temperatures, electron densities and electrical conductivity of double-arc welding (DAW) and HLDAW by utilizing synchronous radiation spectrum, high-speed photography and electrical signal sensing technology. The results indicated that the high concentration of charged particles provided a conductive channel for the two arcs to achieve a more stable welding process in HLDAW. The synergy between the laser and the arc changed the flow mode of the weld pool, which facilitated the molten metal flowing toward the bottom of the molten pool. Obtaining the same melting depth, the line energy input of HLDAW was 13% lower than that of DAW; the heat affected zone is narrower and the grain size is smaller. The weld penetration depth was improved in HLDAW, which was 1.8 times that of DAW and 1.5 times that of pure laser welding under the laser power of 1.5 kW. The weld penetration of HLDAW increased with laser power.

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“…In this regard, it is worth mentioning that there are numerous research lines aimed at the application of this technology to different industrial sectors, which includes not only shipbuilding (sector where its application is most evident) but also the aeronautical industry, offshore, railroad or nuclear industry. The European Union is aware of the possibilities offered by hybrid welding in the naval industry, so that currently there are numerous funded research projects trying to address different aspects of this technology for its full implementation in the industry [49][50][51][52].…”

Section: Lahw In Shipbuildingmentioning

confidence: 99%

“…The combination of arc metal welding with laser beam welding has been introduced into practice at a particularly quick speed (shipbuilding and automobile construction) and is reflected in the expectation of a higher degree of utilization in the industrial practice. Prior studies [49,50,[59][60][61][62] have noted the importance of the fitting stage parameters. The combination results in very positive characteristics such as high energy density and low thermal load, high welding speed, deep penetration and high tensile strength, bridging capacity of gap and the possibility of the addition of filler metal and metal microstructure modification.…”

Section: Gradementioning

confidence: 99%

Laser Hybrid Butt Welding of Large Thickness Naval Steel

Churiaque

Chludzinski

Porrúa-Lara³

et al. 2019

Metals

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Plates joining is one of the first stage at large vessels manufacturing line, process conditioning the whole shipbuilding production. Laser Arc Hybrid Welding (LAHW) process is nowadays providing promising results for large thickness naval steel, being primarily used for welding plates with thicknesses between 6 to 15 mm, reaching up to 51 mm. In addition to this high penetration ability, LAHW allows increasing the production rates. Therefore, this technology is proposed as an alternative to conventional welding processes in shipbuilding, as it integrates the advantages of laser and arc welding, providing high process stability, high welding speed and penetration, narrow weld beads with a low heat input and good metallurgical properties. The present review reports the most representative investigation regarding the use of this technology to join large thickness flat panels of naval steel. It includes a summary of the most influential process variables, equipment characteristics, material properties, naval regulations, as well as microstructural characterisation and mechanical properties of joints. This review is thought to help readers from different backgrounds, covering from non-expert on welding or on naval sector, to industrial LAHW applicators and researchers. The industrial need of performing one single pass procedure to assure high quality welds of high thickness is suggested as one of the key aspects for future investigations.

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Microstructure and Mechanical Properties of Narrow Gap Laser-Arc Hybrid Welded 40 mm Thick Mild Steel

Cited by 39 publications

References 19 publications

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

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

Physical Characteristics of Coupled Plasma and Its Influence on Weld Formation in Hybrid Laser-Double-Arc Welding

Laser Hybrid Butt Welding of Large Thickness Naval Steel

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