Influence of Wire Initial Composition on Anode Microstructure and on Metal Transfer Mode in GMAW: Noteworthy Role of Alkali Elements

Valensi, Flavien; Pellerin, Nadia; Pellerin, Stéphane; Castillon, Quentin; Dzierżęga, Krzysztof; Briand, Francis; Planckaert, Jean-Pierre

doi:10.1007/s11090-017-9860-4

Cited by 11 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2-1) There are other possible effects on the transfer behavior by chemical effects on the viscosity and surface tension of the molten droplet. Both were discussed by Vanlesi et al [15] by comparing the influence of wire composition on anode microstructure and metal transfer behavior in GMAW. The results show that surface tension modification by silicon content is not a key parameter for droplet detachment for considered current density.…”

Section: Effect Of Flux Ratio and Welding Currentmentioning

confidence: 99%

“…From their study of hydrogen trapping with yttrium, Lensing et al [14] reported that the spray transfer mode promotes a more efficient transfer of yttrium to the weld deposit than the globular transfer mode, resulting in reduced amounts of diffusible hydrogen. Valensi et al [15] reported that when using an Ar-CO 2 shielding gas with a CO 2 content of up to 60 vol% at 330 A, the presence of alkaline elements stabilizes the spray arc. Trinh et al [16] observed that the addition of only a small amount of sodium can significantly increase the metal transfer frequency by reducing the arc pressure and enhancing the electromagnetic force acting on the neck of the molten droplet at the wire tip.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Flux Ratio on Droplet Transfer Behavior in Metal-Cored Arc Welding

Trinh

Tashiro

Suga

et al. 2022

Metals

View full text Add to dashboard Cite

The effect of flux ratio on metal transfer behavior during metal-cored arc welding was elucidated through investigation using a standard solid wire and three metal-cored wires with flux mass ratios of (2-2) 10%, 15%, and 20%. Investigation was performed using a shadowgraph technique based on images recorded with a high-speed camera equipped with back-laser illumination. We observed that the droplet transfer frequency increased with both the welding current and flux ratio, with the effect of flux ratio being more dominant at low currents. We surmise that this is because the wire sheath area decreases as the flux ratio is increased. Hence, when the welding current is the same, a reduction in the sheath area (i.e., an increase in flux content) leads to an increase in the current density in the sheath, which enlarges the electromagnetic force at the tip of the wire and aids droplet detachment. Conversely, Joule heating is higher at high welding currents than at low currents. This increased temperature shortens the flux column inside the wire, such that the current flow into the molten droplets is more uniform. Hence, the droplet transfer frequency does not increase significantly if the flux ratio is increased in the high current range.

show abstract

Section: Effect Of Flux Ratio and Welding Currentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Flux Ratio on Droplet Transfer Behavior in Metal-Cored Arc Welding

Trinh

Tashiro

Suga

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

“…They reported that several different metal transfer modes could have coexisted simultaneously. Valensi et al [14] found that the alkaline elements contribute to stabilizing the projected spray arc in an argon-CO 2 gas mixture with 60%vol of CO 2 at a 330 A welding current. Several fluorides, such as CaF 2 , KF, or K 2 SiF 6 , effectively control the hydrogen content contaminated in the weld bead; however, their presence causes an unstable arc with an undesired spatter, as reported in [15].…”

Section: Introductionmentioning

confidence: 99%

Individual Effects of Alkali Element and Wire Structure on Metal Transfer Process in Argon Metal-Cored Arc Welding

et al. 2023

View full text Add to dashboard Cite

This study aimed to clarify the effect of wire structure and alkaline elements in wire composition on metal transfer behavior in metal-cored arc welding (MCAW). A comparison of metal transfer in pure argon gas was carried out using a solid wire (wire 1), a metal-cored wire without an alkaline element (wire 2), and another metal-cored wire with 0.084 mass% of sodium (wire 3). The experiments were conducted under 280 and 320 A welding currents, observed by high-speed imaging techniques equipped with laser assistance and bandpass filters. At 280 A, wire 1 showed a streaming transfer mode, while the others showed a projected one. When the current was 320 A, the metal transfer of wire 2 changed to streaming, while wire 3 remained projected. As sodium has a lower ionization energy than iron, the mixing of sodium vapor into the iron plasma increases its electrical conductivity, raising the proportion of current flowing through metal vapor plasma. As a result, the current flows to the upper region of the molten metal on the wire tip, with the resulting electromagnetic force causing droplet detachment. Consequently, the metal transfer mode in wire 3 remained projected. Furthermore, weld bead formation is the best for wire 3.

show abstract

Various Methods of Metal Transfer in the Welding Process

Aswal

Jain

2022

Lecture Notes in Mechanical Engineering

View full text Add to dashboard Cite

Influence of Wire Initial Composition on Anode Microstructure and on Metal Transfer Mode in GMAW: Noteworthy Role of Alkali Elements

Cited by 11 publications

References 29 publications

Effect of Flux Ratio on Droplet Transfer Behavior in Metal-Cored Arc Welding

Effect of Flux Ratio on Droplet Transfer Behavior in Metal-Cored Arc Welding

Individual Effects of Alkali Element and Wire Structure on Metal Transfer Process in Argon Metal-Cored Arc Welding

Various Methods of Metal Transfer in the Welding Process

Contact Info

Product

Resources

About