A study on convection in molten zone of aluminum alloy during Fe/Al resistance spot welding

Iyota, Muneyoshi; Matsuda, Takeshi; Sano, Tomokazu; Shigeta, Masaya; Shobu, Takahisa; Yumoto, Hirokatsu; Koyama, Takahisa; Yamazaki, Hiroshi; Senba, Yasunori; Ohashi, Haruhiko; Goto, Shunji; Inoue, Ituro; Hayashi, Yujiro; Tamasaku, Kenji; Osaka, Taito; Yamada, Jumpei; Yabashi, Makina

doi:10.1016/j.jmapro.2023.03.032

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…We have applied this incompressible SPH method to the thermofluid simulations of molten metal flows in several kinds of arc welding processes such as GTA weding, 133,134) GMA welding, [135][136][137][138][139] SA welding, 140,141) and Flux-Cored Arc (FCA) welding. 142) Because this incompressible SPH method offers high adaptability for other types of metal processing, it has also revealed the molten metal formation processes with convective and diffusive heat transports during dissimilar Resistance Spot (RS) welding 143,144) and Electroslag (ES) welding 145) collaborating with the experiments, 146,147) and dross formation during gas cutting. 148) 4.3.…”

Section: Sph Representationmentioning

confidence: 96%

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: 96%

Progress of computational plasma fluid mechanics

Shigeta

2023

Jpn. J. Appl. Phys.

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“…The filler metal and base metal were regarded as the same material, and its thermos-physical properties only changed with temperature, as represented by Eqs. (1)(2)(3)(4)(5). Other physical parameters were constants as listed in Table 1.…”

Section: Geometric Models and Thermos-physical Propertiesmentioning

confidence: 99%

“…Al-alloy structural parts were predominantly used in the field of lightweight design, such as aerospace and automobiles, because of its advantages of low density and high specific strength [1][2][3] . It was developing towards high precision, large size and complex shapes, which put higher demands on the manufacturing technology of Al-alloy parts.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of molten pool behavior and bead formation in Al-alloy GMAW board surfacing process

Zong

Zhang

et al. 2023

Preprint

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A transient 3D numerical model was established to investigate the multi-coupling transport phenomena in the Al-alloy GMAW board surfacing process. An integrated self-adaptive distribution mode of "arc current density-arc pressure-electromagnetic force-arc heat" was proposed to adapt to the evolution of the surface morphology of the molten pool. The heat and force state of the molten pool was analyzed to investigate its influence on the bead formation. The results showed that the arc pressure and droplet impingement promoted the backward flow of the liquid metal, thus forming the gouging region. It decreased the concentration of the arc current density, thereby reducing the superheat of the liquid metal and facilitating the filling of the weld toe. Based on the characteristics of the temperature and velocity fields, the characteristics of weld formation in the three stages of arc preheating, melting, and solidification were analyzed. This study revealed the relationship between molten pool behavior and bead formation, promoting the implementation of Al-alloy GMAW in welding and additive manufacturing.

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“…Therefore, the combination of steel and aluminum alloys, i.e., the technique for joining dissimilar materials, is being developed. Methods using resistance spot welding [1][2][3][4][5][6], FSSW [7], laser welding [8], and mechanical fastening [9] have been considered for joining dissimilar materials such as steel and aluminum alloys. However, from the viewpoints of productivity and cost, it is desired to realize joining of dissimilar materials of steel and aluminum alloys using resistance spot welding.…”

Section: Introductionmentioning

confidence: 99%