Effect of joint gap on bead formation in laser butt welding of stainless steel

Zhang, Yanxi; Han, Soonhung; Cheon, Jason; Na, Suck-Joo; Gao, Xiangdong

doi:10.1016/j.jmatprotec.2017.05.040

Cited by 49 publications

(17 citation statements)

References 24 publications

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“…A técnica de TWBs consiste basicamente em fabricar blanks semiacabados, compostos por ao menos duas chapas distintas (em termos de material, espessura, revestimentos e outras propriedades física e/ou químicas), antes da etapa de conformação final para obtenção do produto acabado [14][15][16]. Por meio do processo de TWB consegue-se confeccionar peças com espessura diferenciada na região de maior solicitação mecânica, dispensando o uso de reforços e componentes adicionais.…”

Section: Introductionunclassified

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Andrade

2019

Soldag. insp.

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Resumo Um dos maiores desafios da indústria automobilística, a nível global, trata-se de desenvolver veículos que sejam, simultaneamente, leves e resistentes mecanicamente. O Tailor Welded Blank (TWB) surge como solução, pois é um processo que permite a soldagem de topo de chapas de diferentes especificações (material, espessura e/ou revestimento), antes da conformação. Nesta pesquisa trabalhou-se com chapas de aços livre de intersticiais (IF –Intertitial Free), da Companhia Siderúrgica Nacional (CSN), de códigos FEE 210 de 1,2 mm de espessura e IF CSN FEP 05 de 0,7 mm de espessura, soldadas a laser. Foram feitos ensaios de tração uniaxial e de microdureza Vickers. A linha de solda foi orientada de 0° a 70° (variando de 5° em 5°). A partir dos resultados obtidos espera-se que se possa consolidar uma metodologia para avaliação do melhor ângulo possível para a linha de solda de um TWB. Constatou-se que a carga máxima suportada aumenta à medida que se inclina a linha de solda (até um determinado limite) e que ângulos complementares de inclinação geram cargas cisalhantes similares. Deve-se trabalhar então com ângulos que permitam otimização de resistência mecânica, melhor conformabilidade e maior redução de massa e de custos. A seleção desse ângulo ficará atrelada a questões de projeto e não mais a tentativas e erros.

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Section: Introductionunclassified

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Andrade

2019

Soldag. insp.

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“…The inserts were initially fixed by gas tungsten arc tack-welding. The gap absence avoids energy losses due to the laser beam reflections on the metal internal surface, which were investigated in [21].…”

Section: Welding Trialmentioning

confidence: 99%

Investigation on Laser Beam Weldability of AISI 304L Plates Based on Thermal Field Simulation by Experimentally-Fitted Analytical Modeling

Giudice

Sili

2021

Lasers Manuf. Mater. Process.

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The objective of the work is to present a new approach to the simulation of the thermal field in laser beam welding, based on an experimentally-fitted analytical model, applied to investigate the weldability of AISI 304L austenitic steel. Reference is made to the welding trial in a single pass of two 10 mm thick butt-positioned plates. Welding was performed under the keyhole full penetration mode, which is characteristic of high-power laser beam, and simulated by an analytical model based on a multipoint-line thermal source system and fitted on the experimental fusion zone profile. The model was applied to simulate the effects of welding speed changes on thermal fields and cooling rates, in order to determine how they can affect the weld composition, the solidification mode and the possible formation of a sensitized zone in the heat affected zone. A limit value of welding speed, which allows the weld formation without lack of fusion, was identified. For all the welding speeds considered, the formation of a sensitized zone can be excluded. The contribution of welding speed on cooling rate, not significant near the welding axis, results to be determinant at the boundary of the fused zone with base metal. The combined choice of the filler material and the welding speed, which in all cases gives rise to primary ferrite solidification modes, affects the content of residual ferrite, which must be balanced to enhance the resistance to solidification cracking, avoiding the adverse effects due to too high contents. As a conclusion, the model proves to be a valid support in investigating the thermal effects, which result from the setup of welding parameters, on the weldability of the base metal-filler system. Graphic Abstract

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“…With the development of science and technology, welding technology has been applied to various fields, such as the automobile industry, machinery manufacturing, the shipbuilding industry, aerospace, biomedicine, powder metallurgy, the microelectronics industry, energy generation, and other fields [1][2][3]. In the welding process, due to the influence of the weldment surface condition, joint gap [4], welding power [5], welding speed [6], and other factors, welded products are prone to welding defects, which directly affect the products' quality [7][8][9]. Spot welding is used to weld individual points on the contact surface of the weldment at the joint.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Optical Imaging of Arbitrarily Distributed Defects in Welds under Combined Magnetic Field

Gao

Tian

et al. 2022

Metals

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Using the traditional magneto-optical detection methods, micro-weld defects parallel with the magnetic field direction may be overlooked. In order to overcome this, a non-destructive testing method based on magneto-optical imaging under a vertical combined magnetic field (VCMF) is proposed. To demonstrate this, the experimental results of the magneto-optical imaging of weld defects excited by a vertical combined magnetic field (VCMF) or parallel combined magnetic field (PCMF) are compared with those of traditional magnetic fields (constant magnetic field (CMF), alternating magnetic field (AMF), and rotating magnetic field (RMF)). It is found that the magneto-optical imaging under a VCMF can accurately detect weld defects of any shape and distribution. In addition, the center difference method is used to eliminate the influence of noise on the defect contour extraction of magneto-optical images, and the active contour of weld defects in the magneto-optical images is extracted. The results show that many noises can be identifiedby the robustness of the level set method, operating in low-pass filtering, so that much information that is usually lost can be retained.

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Effect of joint gap on bead formation in laser butt welding of stainless steel

Cited by 49 publications

References 24 publications

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Caracterização Mecânica e Análise Microestrutural de Chapas Obtidas pelo Processo de Tailor Welded Blank (TWB)

Investigation on Laser Beam Weldability of AISI 304L Plates Based on Thermal Field Simulation by Experimentally-Fitted Analytical Modeling

Magneto-Optical Imaging of Arbitrarily Distributed Defects in Welds under Combined Magnetic Field

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