MAG Welding Phenomena with Titania-Based Flux Cored Wire in Vertical Upward Position

Hosoi, Koichi; Hirata, Yoshihiro; Ogino, Yoshisada; Kouno, Hideki

doi:10.7791/jspmee.5.95

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…It was reported that the flux column formation contributed to transfer of uniform droplets and reduction of defects. 149) However, the mechanism of such flux column formation is still poorly understood. This section presents a computational demonstration of a flux column formation and droplet transfer at a TiO 2 -based wire in FCA welding, using the incompressible SPH method.…”

Section: Sph Representationmentioning

confidence: 99%

Progress of computational plasma fluid mechanics

Shigeta

2023

Jpn. J. Appl. Phys.

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This article reviews and discusses the recent progresses of studies with the concept of “Computational plasma fluid mechanics”. Computational demonstrations show that the inhouse simulation codes such as PLASTIPC (PLasma All-Speed Turbulence with Implicit Pressure Code) have captured hydrodynamic instabilities and reproduced flow dynamics in thermal plasma – nonionized gas coexisting systems. A unique method has made it feasible to study collective growth of binary alloy nanoparticles by numerical analysis. SPH (Smoothed Particle Hydrodynamics) method with incompressibility modification has achieved complex behaviors of molten metal involving phase change, flow, heat transport, material mixing, and large deformation during arc welding. It is essential to study thermal plasma processes as comprehensive fluid systems in which hot plasma, cold nonionized gas, and materials coexist. The viewpoint and approaches of fluid mechanics as well as plasma physics are indispensable. Computational study will play a more important role in giving us new and deeper insights.

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Section: Sph Representationmentioning

confidence: 99%

Progress of computational plasma fluid mechanics

Shigeta

2023

Jpn. J. Appl. Phys.

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“…However, few technical studies on the weldability of the vertical-up position using MAG welding with flux-cored wire have been reported. Hosoi et al [24] reported that the mold of a slag layer supporting the molten pool is necessary to prevent molten pool dropping with partly mechanized welding, which is a phenomenon called the mold effect. It is assumed that this mold effect must be reproduced in LAHW.…”

Section: Weldability In Vertical-up Positionmentioning

confidence: 99%

Expansion of laser–arc hybrid welding to horizontal and vertical-up welding

Uemura

Gotoh

Uchino³

2022

Weld World

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Laser-arc hybrid welding (LAHW) is an advanced welding method that combines arc welding and laser welding and can achieve deep penetration and the reduction of welding deformation compared with conventional arc welding. As with other welding techniques, it is common to target the flat position (PA) as the welding position. However, the expansion of the applicable positions enables the application of highquality welded joints fabricated by LAHW to many welded joints in large steel structures. This study used the LAHW system with a robot manipulator to establish weldability in the horizontal position (PC) and the vertical-up position (PF) to expand the applicable range of LAHW in large steel structures. Suitable LAHW conditions for fabricating the butt-welded joint with a welding length of 1,000 mm for these positions were established through various investigations, including molten pool observation. Finally, the quality of these joints was evaluated in accordance with the Laser Arc Hybrid Welding Guidelines (ClassNK) of Nippon Kaiji Kyokai, and it was confirmed that the joints satisfy the required standards.

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“…Hosoi et al observed the flux column formation process and discussed about the effect of the flux column on the molten metal droplet transfer process during a vertical upward welding 5) . They clarified that the flux column was formed in the FCAW using wires whose component included TiO2.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that the flux column formation contributed to the uniform droplet transfer and the suppression of the defect generation 4,5) . However, flux column formation mechanisms during the FCAW have not been clarified because it is difficult to observe the inside of the wire by experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Droplet Transfer with TiO2 Flux Column During Flux Cored Arc Welding by 3D Smoothed Particle Hydrodynamics Method

Ueno

Komen

Shigeta

et al. 2020

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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A molten metal droplet transfer processes were simulated by a numerical model using a three-dimensional smoothed particle hydrodynamics method in order to clarify the flux column formation mechanism at the tip of a wire during a flux cored arc welding process. This study focuses on the flux cored arc welding with TiO2 based wire. As a result, although the average droplet size obtained by the computation was larger than that by the experiment, the average length of the flux column obtained by the computation showed agreement with that by the experiment, which supports supported validity of this computational model. Moreover, the melting rate of the metal-pipe around flux was higher than flux. The flux column was formed at the tip of the wire. The simulations with different values of a specific heat and a thermal conductivity were performed to investigate the effect of the heat conduction in the wire on the flux column formation. The unmelted flux column was formed at the tip of the wire when the specific heat of the flux component was smaller and the thermal conductivity was higher than those of TiO2. The result indicated that the heat conduction in flux played an important role in the flux column formation during flux cored arc welding.

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MAG Welding Phenomena with Titania-Based Flux Cored Wire in Vertical Upward Position

Cited by 4 publications

References 2 publications

Progress of computational plasma fluid mechanics

Progress of computational plasma fluid mechanics

Expansion of laser–arc hybrid welding to horizontal and vertical-up welding

Numerical Simulation of Droplet Transfer with TiO2 Flux Column During Flux Cored Arc Welding by 3D Smoothed Particle Hydrodynamics Method

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