Statistical modelling of weld bead geometry in oscillating arc narrow gap all-position GMA welding

Xu, Wangqiong; Lin, Sanbao; Fan, Chenglei; Zhuo, Xing; Yang, Chun

doi:10.1007/s00170-014-5799-2

Cited by 42 publications

(20 citation statements)

References 12 publications

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“…Esta melhora diz respeito ao aumento da penetração nas laterais do chanfro ao mesmo tempo em que a penetração na raiz diminui com o aumento da frequência de oscilação resultando, assim, num cordão de geometria mais adequada. Resultados semelhantes também foram obtidos por Xu et al [15,16] ao empregarem parâmetros obtidos por simulação numérica na soldagem de chapas de aço baixo carbono com 25 mm de espessura. Já na soldagem de filete da junta dissimilar composta pelo aço inoxidável AISI 304L e o aço baixo carbono S355MC Tasalloti et al [17] identificaram que o tecimento reduziu a penetração no S355MC e aumentou no 304L.…”

Section: Soldagem and Inspeção 2018;23(1):73-82unclassified

Avaliação do Uso do Tecimento na Soldagem a Arco Submerso

Cunha

Ribeiro

2018

Soldag. insp.

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado.Recebido: 08 Dez., 2017 Aceito: 04 Abr., 2018 E-mails: t.cunha@ufsc.br (TVC), hormeu@ifsc.edu.br (HOR)Resumo: Apesar de muito comum em diversos processos de soldagem, não se encontra nas aplicações industriais, tampouco na literatura especializada, qualquer referência ao uso do movimento de oscilação transversal do eletrodo na soldagem a arco submerso. Em vista disso, neste trabalho foi realizada uma investigação quanto ao emprego da técnica de tecimento no processo SAW. Para tanto, foram realizados ensaios de soldagem com amplitudes de tecimento (triangular) entre 0 e 30 mm para três níveis diferentes de energia de soldagem e avaliadas a penetração, largura, reforço, área do reforço e da área fundida dos cordões de solda obtidos, além da estabilidade do processo. Como resultado, verificou-se que, além de perfeitamente viável, a aplicação da citada técnica no processo SAW resultou em maior eficiência de fusão no processo, sem, entretanto, acarretar em instabilidades no processo ou problemas relacionados à inclusão de escória.Palavras-chave: Oscilação transversal; SAW; Eficiência de fusão; Morfologia dos cordões. Evaluation of Oscillation Movement in Submerged Arc WeldingAbstract: Although very common in many welding processes, there is no reference in the industrial applications, nor in the specialized literature, to the use of transverse oscillation movement of the electrode in submerged arc welding. In view of this, in this work an investigation was made regarding the use of the weaving technique in the SAW process. Therefore, welding tests with amplitudes of weaving (triangular) between 0 and 30 mm were carried out for three different levels of welding energy and the penetration, width, reinforcement, reinforcement area and melt area of the weld beads obtained were evaluated, besides the stability of the process. As a result, it was found that, in addition to being perfectly feasible, the application of cited technique in the SAW resulted in higher process melt efficiency, without, however, process instabilities or problems related to the inclusion of slag. Key-words:Transverse oscillation; SAW; Fusion efficiency; Weld bead morphology. IntroduçãoO emprego do processo de soldagem a arco submerso (SAW) na construção pesada como em estaleiros, mineradoras, siderúrgicas, fábricas de perfis e estruturas metálicas é algo recorrente. Isto se deve, sobretudo, a capacidade deste processo em atender a uma demanda comum destas empresas, que consiste na união de chapas de maior espessura.Uma característica marcante do processo SAW está no seu elevado rendimento de deposição e de fusão. Isto se deve, fundamentalmente, à inexistência de perdas de material por projeções ou respingos e à menor perda de calor para o meio, o que faz com que o processo aprese...

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Section: Soldagem and Inspeção 2018;23(1):73-82unclassified

Avaliação do Uso do Tecimento na Soldagem a Arco Submerso

Cunha

Ribeiro

2018

Soldag. insp.

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“…With the fast development of heavy industries, all-position automatic tungsten inert gas (TIG) welding of pipes had been widely applied to industries such as shipbuilding, nuclear power, chemical industries, and natural gas transportation. Welding plays an important role in joining pipes [1]. Traditional all-position welding of pipes is manual arc welding, but it has low welding efficiency, poor stability, and high cost.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model for Prediction and Optimization of Weld Bead Geometry in All-Position Automatic Welding of Pipes

Liao

Shi

Cui

et al. 2018

Metals

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In this study all-position automatic tungsten inert gas (TIG) welding was exploited to enhance quality and efficiency in the welding of copper-nickel alloy pipes. The mathematical models of all-position automatic TIG weld bead shapes were conducted by the response surface method (RSM) on the foundation of central composition design (CCD). The statistical models were verified for their significance and adequacy by analysis of variance (ANOVA). In addition, the influences of welding peak current, welding velocity, welding duty ratio, and welding position on weld bead geometry were investigated. Finally, optimal welding parameters at the welding positions of 0° to 180° were determined by using RSM.

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“…Different trends were found for humping, overflow, and lack of penetration. Lin et al [8][9][10] investigated the molten pool behavior for all-position narrow gap GMAW of 25-mm-thick carbon steel plates and found that the molten pool surfaces had different shapes when welding in flat, vertical down, and overhead welding positions due to the different actions of gravity. Chen et al [11] studied the effects of welding position on the droplet transfer behavior during hybrid CO 2 laser-MAG welding of 16-mm-thick steel and indicated that the gravity, in combination with the electromagnetic force, would cause great differences in impacting positions, modes, dimensions, and frequencies of the droplets for different welding positions (flat, horizontal, and vertical).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Laser Welding of Ti6Al4V Alloy Sheets in Flat and Horizontal Positions

Chang

Zhang

et al. 2017

Applied Sciences

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Laser welding has been increasingly utilized to manufacture a variety of components thanks to its high quality and speed. For components with complex shapes, the welding position needs be continuously adjusted during laser welding, which makes it necessary to know the effects of the welding position on the quality of the laser welds. In this paper, the weld quality under two (flat and horizontal) welding positions were studied comparatively in the laser welding of Ti6Al4V titanium alloy, in terms of weld profiles, process porosity, and static tensile strengths. Results show that the flat welding position led to better weld profiles, less process porosity than that of the horizontal welding position, which resulted from the different actions of gravity on the molten weld metals and the different escape routes for pores under different welding positions. Although undercuts showed no association with the fracture positions and tensile strengths of the welds, too much porosity in horizontal laser welds led to significant decreases in the strengths and specific elongations of welds. Higher laser powers and travel speeds were recommended, for both flat and horizontal welding positions, to reduce weld porosity and improve mechanical properties.

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Statistical modelling of weld bead geometry in oscillating arc narrow gap all-position GMA welding

Cited by 42 publications

References 12 publications

Avaliação do Uso do Tecimento na Soldagem a Arco Submerso

Avaliação do Uso do Tecimento na Soldagem a Arco Submerso

Mathematical Model for Prediction and Optimization of Weld Bead Geometry in All-Position Automatic Welding of Pipes

A Comparative Study on the Laser Welding of Ti6Al4V Alloy Sheets in Flat and Horizontal Positions

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