Experimental and numerical investigation of an electromagnetic weld pool support system for high power laser beam welding of austenitic stainless steel

Bachmann, Markus; Avilov, Vjaceslav; Gumenyuk, Andrey; Rethmeier, Michael

doi:10.1016/j.jmatprotec.2013.11.013

Cited by 117 publications

(32 citation statements)

References 21 publications

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“…Melt sagging or drop-out is a common welding defect for single pass laser welding of thick section materials in the 1G position. 28 The surface tension of the molten metal cannot always compensate for the hydrostatic pressure in the melt for full penetration welding of thick section materials in the 1G position. This can result in sagging on the root side and at the top surface of the weld when the specimen thickness is above a threshold.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Residual stress distributions in laser and gas-metal-arc welded high-strength steel plates

Guo

Francis

et al. 2016

Materials Science and Technology

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S700 is a high-strength steel recently developed by Tata Steel. This paper describes the residual stress distributions in a multi-pass gas-metal-arc weld (GMAW), a single pass autogenous laser weld (ALW) and a multi-pass ultra-narrow gap laser weld (NGLW) in 13 mm thick high-strength (S700) steel plates, as measured by X-ray diffraction and the contour method. The relationships between microstructural variation and residual stress distributions were investigated. It was found that solid-sate phase transformations from austenite to ferrite, bainite and martensite changed both the magnitude and distribution of residual stresses in the three different welded specimens. The width of the regions sustaining tensile stress in each specimen decreased in the following order: GMAW > ALW > ultra-NGLW.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Residual stress distributions in laser and gas-metal-arc welded high-strength steel plates

Guo

Francis

et al. 2016

Materials Science and Technology

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“…Simulating the weld pool support, the pressure differences between the upper and lower surfaces were analyzed to evaluate the degree of compensation of the hydrostatic pressure. The formula apparatus and simulation details can be found in detail in Bachmann et al (2012), Bachmann et al (2013) and Bachmann et al (2014).…”

Section: Numerical Simulation Of a Weld Pool Support By Oscillating Mmentioning

confidence: 99%

“…Nevertheless, an optimal control of the hydrostatic pressure in the melt was proven for all frequencies. Increasing the frequency leads to lower magnetic flux densities for the compensation of the 20 mm stainless steel, see Bachmann et al (2014), which is due to a frequency-dependent relation between the applied magnetic flux density and the resulting Lorentz force.…”

Section: Stainless Steel Aisi 304mentioning

confidence: 99%

Experimental and Numerical Investigation of an Electromagnetic Weld Pool Control for Laser Beam Welding

et al. 2014

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The objective of this study was to investigate the influence of externally applied magnetic fields on the weld quality in laser beam welding. The optimization of the process parameters was performed using the results of computer simulations. Welding tests were performed with up to 20 kW laser beam power. It was shown that the AC magnet with 3 kW power supply allows for a prevention of the gravity drop-out for full penetration welding of 20 mm thick stainless steel plates. For partial penetration welding it was shown that an 0.5 T DC magnetic field is enough for a suppression of convective flows in the weld pool. Partial penetration welding tests with 4 kW beam power showed that the application of AC magnetic fields can reduce weld porosity by a factor of 10 compared to the reference joints. The weld surface roughness was improved by 50 %.

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“…一些研究者假定激光深熔焊熔池达到准稳态后小孔的形状不再发生动态变化，通过预先假定小孔形状的方法来考虑小孔对熔池行为的影响，研究激光深熔焊中熔池传热与流动行为。预置的小孔有圆柱形 [57] 、圆台形 [58] 或是基于能量或力平衡方程计算的特定形状 [59][60][61] 。目前较为常用的预置小孔形状确定方法是 KAPLAN [59] 提出的点对点能量平衡模型。张转转等 [60] 、BACHMANN 等 [61] 在 KAPLAN [65] 。图 16b 为使用 DSM 法计算的激光束反射路径 [66] 。 CHO 等 [67] 采用 VOF 法对动态小孔界面进行追踪，并结合基于光线追踪法的多重反射 Fresnel 吸收模型计算了激光能量在小孔壁面的分布规律，模拟了小孔的形成、塌陷过程及气孔缺陷的形成，如图 17 所示。近期， HAN 等 [68] 提出了基于逐步搜索法(Progressive …”

Section: 预置小孔形状的数值模型unclassified

Progress in Numerical Simulation of Thermal Processes and Weld Pool Behaviors in Fusion Welding

Chen¹

2018

JME

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Abstract：The fusion welding processes are extensively used material joining processes in manufacturing industry. The thermal physics and weld pool behaviors in fusion welding have decisive influence on the weld bead quality, the microstructure and service performance of the joints. Accurate analysis and calculation of thermal processes and weld pool behaviors are of great significance to the welding metallurgy analysis, stress & deformation analysis, process control and process optimization etc. Numerical simulation is also a necessary way to turn welding from qualitative description & experience-based art into quantitative analysis-& and science-based engineering branch. The state-of-art and existing problems of numerical simulation for arc physics, droplet transfer behavior, high-speed weld bead defect formation, keyhole dynamics and weld pool behaviors of plasma arc welding, laser welding and laser-arc hybrid welding are reviewed, and the trend in this field is also discussed, aiming at providing a fundamental guideline for the fusion welding process optimization and control. Key words：fusion

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Experimental and numerical investigation of an electromagnetic weld pool support system for high power laser beam welding of austenitic stainless steel

Cited by 117 publications

References 21 publications

Residual stress distributions in laser and gas-metal-arc welded high-strength steel plates

Residual stress distributions in laser and gas-metal-arc welded high-strength steel plates

Experimental and Numerical Investigation of an Electromagnetic Weld Pool Control for Laser Beam Welding

Progress in Numerical Simulation of Thermal Processes and Weld Pool Behaviors in Fusion Welding

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