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

Chen, Wu

doi:10.3901/jme.2018.02.001

Cited by 22 publications

(11 citation statements)

References 3 publications

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“…Such physical transport mechanisms determine the stability of the welding process and the resultant weld quality. Thus, the arc and weld pool behaviours have decisive influence on the weld quality and the welding efficiency [9]. If the arc and weld pool behaviours are maintained and controlled in an appropriate way, satisfactory quality of both welding process and weld joint can be obtained.…”

Section: External Magnetic Field-assisted Arc Weldingmentioning

confidence: 99%

Auxiliary energy-assisted arc welding processes and their modelling, sensing and control

Wang

Chen

Chen³

2021

Science and Technology of Welding and Joining

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Arc welding processes are still widely used in manufacturing industry. To further improve the arc welding efficiency and the joint quality, secondary energy field/source is usually applied to assist the conventional arc welding process. Modelling, sensing and control of such arc welding processes are efficient and powerful ways for process modification and development and complete understanding the underlying interaction mechanism of the auxiliary energy and the welding process. This article reviews the present status in this aspect. A few typical examples such as external magnetic field-assisted gas metal arc welding, ultrasonic vibration-assisted gas tungsten/metal arc welding, and ultrasonic-assisted plasma arc welding are introduced to demonstrate their system, principle and effectiveness. Additionally, some challenges and future outlooks are summarised.

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Section: External Magnetic Field-assisted Arc Weldingmentioning

confidence: 99%

Auxiliary energy-assisted arc welding processes and their modelling, sensing and control

Wang

Chen

Chen³

2021

Science and Technology of Welding and Joining

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“…According to the GB/T14957-1944 criteria, the welding wire used in the calculations was H08Mn 2 SiA. Its temperature-dependent thermal properties (surface tension, specific heat, thermal conductivity, and dynamic viscosity) are discussed in [ 24 , 26 ]. The densities of the wire and droplet were constant at 7800 kg/m 3 .…”

Section: Materials Properties and Welding Parametersmentioning

confidence: 99%

“…The shielding gas used for MIG and TIG arcs was always argon. Its temperature-dependent thermal properties, such as its density, specific heat, viscosity, thermal conductivity, electrical conductivity, and radiant emission coefficient, are given in [ 24 , 26 , 27 , 28 ].…”

Section: Materials Properties and Welding Parametersmentioning

confidence: 99%

Numerical Simulation of Arc and Droplet Behaviors in TIG-MIG Hybrid Welding

Han

Chen

et al. 2020

Materials

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Tungsten inert gas-metal inert gas hybrid welding (TIG-MIG) combines the advantages of tungsten and metal inert gas welding. It can efficiently produce high-quality weld joints that meet modern manufacturing quality and efficiency requirements. Based on heat transfer, fluid dynamics, and electromagnetic theory, a three-dimensional coupled transient model of arc-droplet interactions in TIG-MIG hybrid welding was established. In this study, the temperature field, flow field, electromagnetic force, pressure, and current density parameters were analyzed in the arc space. The results show that introducing TIG welding has a significant impact on MIG welding.

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“…The force on the unit area of the molten pool can be obtained according to the following equation (Wu, 2010): …”

Section: Fabrication Of Straight Inclined Thin-walled Partmentioning

confidence: 99%

Fabrication of curved overhanging thin-walled structure with robotic wire and arc additive manufacturing (RWAAM)

Qin

et al. 2019

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Purpose Robotic wire and arc additive manufacturing (RWAAM) is becoming more and more popular for its capability of fabricating metallic parts with complicated structure. To unlock the potential of 6-DOF industrial robots and improve the power of additive manufacturing, this paper aims to present a method to fabricate curved overhanging thin-walled parts free from turn table and support structures. Design/methodology/approach Five groups of straight inclined thin-walled parts with different angles were fabricated with the torch aligned with the inclination angle using RWAAM, and the angle precision was verified by recording the growth of each layer in both horizontal and vertical directions; furthermore, the experimental phenomena was explained with the force model of the molten pool and the forming characteristics was investigated. Based on the results above, an algorithm for fabricating curved overhanging thin-walled part was presented and validated. Findings The force model and forming characteristics during the RWAAM process were investigated. Based on the result, the influence of the torch orientation on the weld pool flow was used to control the pool flow, then a practical algorithm for fabricating curved overhanging thin-walled part was proposed and validated. Originality/value Regarding the fabrication of curved overhanging thin-walled parts, given the influences of the torch angles on the deposited morphology, porosity formation rate and weld pool flow, the flexibility of 6-DOF industrial robot was fully used to realize instant adjustment of the torch angle. In this paper, the deposition point and torch orientation of each layer of a robotic fabrication path was determined by the contour equation of the curve surface. By adjusting the torch angle, the pool flow was controlled and better forming quality was acquired.

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

Cited by 22 publications

References 3 publications

Auxiliary energy-assisted arc welding processes and their modelling, sensing and control

Auxiliary energy-assisted arc welding processes and their modelling, sensing and control

Numerical Simulation of Arc and Droplet Behaviors in TIG-MIG Hybrid Welding

Fabrication of curved overhanging thin-walled structure with robotic wire and arc additive manufacturing (RWAAM)

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