Experimental Study on Effects of Gas-shielding in Lap-fillet Arc Welding

Tanaka, Manabu; Yamada, Tetsuo; Shigeta, Masaya; Komen, Hisaya; Fukahori, Mitsugi; Saito, Naoko

doi:10.2207/qjjws.39.51

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…．溶接アークプラズマに対して発光分光分析を適用することで，近年では重ねすみ肉アーク溶接時のガスシールド性 16) やガスメタルアーク溶接現象に与えるシールドガス組成の影響 17) ，ティグ溶接中の金属蒸気輸送およびそれに伴う電極消耗メカニズム [18][19][20][21][22][23][24] Table 6 Ionization energies of cerium and thorium 31) .…”

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Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Tanaka

Shigeta

Komen

et al. 2021

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Tanaka

Shigeta

Komen

et al. 2021

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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“…The laser wavelength was 640 nm, the frame rate was set to 8000 fps and the exposure time was set to 123 µs. Please refer to the previous study for more information 6) .…”

Section: Visualization Of Gas Flow By Schlieren Methodsmentioning

confidence: 99%

Investigation for Oxygen Transfer Mechanism During Gas Tungsten Arc Welding with Carbon Dioxide Gas

Asai

Komen

Tanaka

et al. 2023

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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As one of techniques to improve a penetration depth in a gas tungsten arc welding, it has been proposed that carbon dioxide gas is applied as a shielding gas using a double shielding torch. Two types of gases can flow independently in the double shielding torch: inner gas and outer gas. The purpose of this study was clarification of the carbon dioxide behavior to establish a guideline for controlling oxygen contamination which affects the toughness of welded part formed by this welding process. As a result, it was revealed that carbon dioxide in the outer gas was transported to the vicinity of central axis of a tungsten electrode by the vortex generated near the electrode. Then, oxygen was produced by dissociation of carbon dioxide. It was suggested that the dissociated oxygen increased the oxygen concentration in the gas flowing on a base metal surface.

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“…[100][101][102][103][104][105][106][107][108][109] Moreover, oxygen contamination was measured on a water-cooled cupper 110) and investigated by optical visualization techniques of Schlieren method and xenon emission filtering. 4,5) Simulations were also used to obtain numerical information in arc plasmas, which could hardly be measured. 8,9,[111][112][113][114][115][116][117][118] The molten metals produced during arc welding have also been investigated.…”

Section: Mpbulkmentioning

confidence: 99%

“…In arc welding, even if the flow is less turbulent, vortices can also deteriorate welding quality by entrain oxygen into the shielding inert gas. 4,5) Conversely, vortices are generated in the weld pool and strongly affect the heat transfer, which determines the depth of weld penetration. 6,7) In addition to such vortices, the electromagnetic-thermal-hydrodynamic interaction between the arc plasma and the deforming weld pool or the melting electrode determine the welding process as well.…”

Section: Introductionmentioning

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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Experimental Study on Effects of Gas-shielding in Lap-fillet Arc Welding

Cited by 4 publications

References 21 publications

Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Identification of light emitting elements around tungsten electrode during TIG welding using optical emission spectroscopy

Investigation for Oxygen Transfer Mechanism During Gas Tungsten Arc Welding with Carbon Dioxide Gas

Progress of computational plasma fluid mechanics

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