Review on magnetically controlled arc welding process

Wu, Hong; Chang, Yunlong; Lü, Lin; Bai, Jin

doi:10.1007/s00170-017-0068-9

Cited by 81 publications

(31 citation statements)

References 67 publications

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“…Alongside with helping with the fluid flow during the welding or additive manufacturing process, electromagnetic stimuli can be used to control the droplet transfer, as widely exemplified for arc welding [274]. The transfer modes during welding are known to affect the shape and dimension of the molten pool, spatter and fumes formation, microstructure and mechanical properties and, more importantly, production rates.…”

Section: Control Of the Microstructure Using External Stimuli 441 mentioning

confidence: 99%

Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice

Oliveira

Santos

Miranda

2020

Progress in Materials Science

467

134

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Additive manufacturing technologies based on melting and solidification have considerable similarities with fusion-based welding technologies, either by electric arc or high-power beams. However, several concepts are being introduced in additive manufacturing which have been extensively used in multipass arc welding with filler material. Therefore, clarification of fundamental definitions is important to establish a common background between welding and additive manufacturing research communities. This paper aims to review these concepts, highlighting the distinctive characteristics of fusion welding that can be embraced by additive manufacturing, namely the nature of rapid thermal cycles associated to small size and localized heat sources, the non-equilibrium nature of rapid solidification and its effects on: internal defects formation, phase transformations, residual stresses and distortions. Concerning process optimization, distinct criteria are proposed based on geometric, energetic and thermal considerations, allowing to determine an upper bound limit for the optimum hatch distance during additive manufacturing. Finally, a unified equation to compute the energy density is proposed. This equation enables to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.

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Section: Control Of the Microstructure Using External Stimuli 441 mentioning

confidence: 99%

Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice

Oliveira

Santos

Miranda

2020

Progress in Materials Science

467

134

View full text Add to dashboard Cite

show abstract

“…Theoretically, the process parameters were optimized using the software tool "optimizer," which is available in Minitab (17, State college, PA, USA), with the objective function as the aspect ratio (AR) to be minimized, as shown in Equation 22, keeping an eye on the heat factor, as shown in Equation (23). The corresponding inputs are shown in Equation (24).…”

Section: Optimization Of Bead Parametersmentioning

confidence: 99%

The Effect of an External Magnetic Field on the Aspect Ratio and Heat Input of Gas-Metal-Arc-Welded AZ31B Alloy Weld Joints Using a Response Surface Methodology

et al. 2020

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This study attempted to analyze and optimize the effect of an external magnetic field (EMF) on the aspect ratio and heat input for AZ31B weld joints that were welded using the gas metal arc welding (GMAW) process. The response surface methodology (RSM) was adopted for the critical analysis, and subsequently, mathematical models were developed based on the experimental results. It was observed that the EMF and its interaction with the wire feed rate significantly affected the aspect ratio and heat input, respectively. At 119 G (magnetic field), 700 mm/min (welding speed), 5.8 m/min feed rate, and 11.5 L/min (gas flow rate), the aspect ratio was 2.26, and the corresponding heat input factor (HIf) was 0.8 with almost full weld penetration.

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“…When an extra magnetic field is added to the welding process, the current flow path, temperature, velocity and other properties of the welding arc and molten pool will be changed [ 19 , 20 ]. Some research results have shown that the temperature field of the welding arc is nonaxisymmetrical under a longitudinal magnetic field [ 21 ], and the current density on the workpiece surface is no longer Gaussian distribution if an axial magnetic field is used in the arc column [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Heating Characteristics of Magnetic Oscillation Arc and the Fluid Flow in Molten Pool in Narrow Gap Gas Tungsten Arc Welding

Jian

Yang

et al. 2020

Materials

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Magnetic oscillation arc (MOA) technology was developed to avoid insufficient fusion defects appearing at the sidewalls in narrow gap gas tungsten arc welding (NG-GTAW). In this work, a unified model was developed to simulate the process of MOA assisted NG-GTAW. The model included the MOA, welding pool, workpiece and the coupling interaction between them. The heating characteristic of the MOA and the flow of liquid metal were simulated, and the mechanism of forming a uniform welding bead under MOA was investigated. It was found that if the magnetic flux density increased to 9 mT, the MOA could point to the sidewall directly; the maximum heat flux at the bottom declined by almost half and at the side, it increased by more than ten times. Additionally, the heat flux was no longer concentrated but dispersed along the narrow groove face. Under the effect of MOA, there were mainly two flow vortexes in the molten pool, which could further increase the heat distribution between the bottom, sidewall and corner, and was beneficial for the formation of a good-shape weld. The model was validated by experimental data.

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Review on magnetically controlled arc welding process

Cited by 81 publications

References 67 publications

Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice

Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice

The Effect of an External Magnetic Field on the Aspect Ratio and Heat Input of Gas-Metal-Arc-Welded AZ31B Alloy Weld Joints Using a Response Surface Methodology

Numerical Analysis of the Heating Characteristics of Magnetic Oscillation Arc and the Fluid Flow in Molten Pool in Narrow Gap Gas Tungsten Arc Welding

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