High speed X-ray observation of digital controlled submerged arc welding phenomena

Abe, Yohei; Fujimoto, Takahiro; Nakatani, Mitsuyoshi; Komen, Hisaya; Shigeta, Masaya; Tanaka, Manabu

doi:10.1080/13621718.2021.1908746

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…8,9,[111][112][113][114][115][116][117][118] The molten metals produced during arc welding have also been investigated. The melting and deforming behaviors of weld pools and molten fluxes in SA welding were captured by an Xray transmission imaging technnique 119,120) to support the mechanism clarifications. 121,122) The deforming behaviors of molten electrodes were observed directly using high-speed video recording during a SA welding 120) and a GTA welding.…”

Section: Mpbulkmentioning

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: Mpbulkmentioning

confidence: 99%

Progress of computational plasma fluid mechanics

Shigeta

2023

Jpn. J. Appl. Phys.

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“…The study consists of choosing the measurable and easily controllable parameters of the submerged electric arc welding regime, after welding the samples subjected to X-ray control, the images obtained, and the measurements performed will be analysed and interpreted to find a correlation between the various welding defects that will appear and the variable parameters. [2][3][4][5]…”

Section: Aim and Research Tasksmentioning

confidence: 99%

X-ray analysis of welding parameters influence on pressure vessel steel P355 N

Cioroagă,

Cioată

2023

J. Phys.: Conf. Ser.

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The paper presents a study on the influence of welding parameters that is done by radiographic interpretation of the X-ray analysis results collected from welded joins that had been realized by varying the welding current intensity, tension and welding speed. The base material of the experiment is a pressure vessel steel P355 N used for constructing railway tanks for transporting liquids by train. The welding method used is flux-cored arc welding, done by a semi-automatic welding machine using welding wire as joining material. The research aims to find connections between different material welding defects and the welding parameters involved in the process of flux-cored arc welding.

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“…In addition, the droplet transfer was more similar to spray transfer because the diameter of the droplet was smaller than that of the wire, although the positional relationship between the arc and the droplet was similar to that of the globular transfer. Abe et al [17] proposed that under the condition with a welding current of 600 A, an EN ratio of 0.5, and an arc voltage of 33 V, the droplet transfer mode of SAW was the spray transfer. Then, with the EN ratio increased, the droplet diameter increased while the transfer frequency decreased.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Metal Transfer and Cavity Evolution during Submerged Arc Welding with X-ray Imaging Technology

Han,

Jia,

et al. 2023

Metals

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The physical phenomena of submerged arc welding (SAW) conducted with a 1.6 mm flux-cored wire were investigated using X-ray imaging technique. Three kinds of metal transfer modes were confirmed in this paper, namely the front flux wall-guided droplet transfer, back flux wall-guided droplet transfer, and repelled droplet transfer, of which the corresponding percentages were 47.65%, 45.29%, and 7.06%, respectively. Although the average sizes of the droplets for SAW and FCAW (flux-cored wire welding) were 2.0 mm and 1.9 mm with an average droplet transfer time of 90.3 ms, it required 36.4% more time for the droplet of SAW to finish one metal transfer than it did in FCAW. In addition, the volume of the cavity was not constant but repeated a cycle mode of “expansion and contraction” during the whole process. Thus, the dynamics of the cavity and viscous resistance caused by the flux collectively slowed down the velocity of the droplets from the wire to the weld pool in SAW. Compared with FCAW, a smoother weld without pits and pores was manufactured during the SAW process. Due to the compression effect of the flux, the 14.5 mm average weld width of SAW was 2.9 mm shorter than that of the FCAW. Furthermore, the thickness of slag with a porous structure in SAW was 2.7 times of that in FCAW, indicating that it could provide better protection to the weld of SAW.

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High speed X-ray observation of digital controlled submerged arc welding phenomena

Cited by 8 publications

References 30 publications

Progress of computational plasma fluid mechanics

Progress of computational plasma fluid mechanics

X-ray analysis of welding parameters influence on pressure vessel steel P355 N

Investigation on the Metal Transfer and Cavity Evolution during Submerged Arc Welding with X-ray Imaging Technology

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