Numerical analysis of AC tungsten inert gas welding of aluminum plate in consideration of oxide layer cleaning

Tashiro, Shinichi; Miyata, Mikiji; Tanaka, Manabu

doi:10.1016/j.tsf.2011.04.137

Cited by 17 publications

(8 citation statements)

References 6 publications

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“…21, 22 Cathode spots tend to be produced on the oxide layer which has lower work function than that of base metals. 23 Moreover, the lower the work function of the electrons, the more stable the burning of the arc. 24 When stainless steel is the cathode, compare with aluminium, the arc becomes very unstable because the work function of stainless steel is much higher than aluminium.…”

Section: Introductionmentioning

confidence: 99%

Flux modification for AC-TIG braze welding of aluminium to stainless steel

Yang

Lin

et al. 2014

Science and Technology of Welding and Joining

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A modified flux consisting of KAlF 4 and aluminium powder was developed for AC-TIG braze welding of aluminium to stainless steel. By employing the flux, the arc instability and wetting angle was decreased significantly, and therefore a good joint shape was obtained. The wetting and spreading behaviour as well as the action mechanism of the flux were changed. Microstructure analysis suggested that the intermetallic compound (IMC) thickness increased obviously when the addition percentage of aluminium powder in the flux exceeded 40 wt-%. Results of tensile tests illustrated that a significant improvement in mechanical properties of the butt joint was obtained with the modified flux, and tensile strength increased from 125 to 170 MPa in maximum. Relationships between aluminium powder content in the flux and wetting angle, IMC thickness as well as tensile strength were established. Results indicated that the joint strength was affected both by weld shape and IMC thickness.

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Section: Introductionmentioning

confidence: 99%

Flux modification for AC-TIG braze welding of aluminium to stainless steel

Yang

Lin

et al. 2014

Science and Technology of Welding and Joining

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“…Another reason for the pressure reduction in the EP phase is the different physical process on the interaction of the plasma arc and the base metal in EN and EP phases. Tashiro et al [30] pointed out that the cathode spot tended to be produced on the oxide layer. The current flowing between the arc and base metal is conducted mainly through the cathode spots.…”

Section: Resultsmentioning

confidence: 99%

Effect of Arc Pressure on the Digging Process in Variable Polarity Plasma Arc Welding of A5052P Aluminum Alloy

Tashiro

Jiang

et al. 2019

Materials

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The keyhole digging process associated with variable polarity plasma arc (VPPA) welding remains unclear, resulting in poor control of welding stability. The VPPA pressure directly determines the dynamics of the keyhole and weld pool in the digging process. Here, through a high speed camera, high frequency pulsed diode laser light source and X-ray transmission imaging system, we reveal the potential physical phenomenon of a keyhole weld pool. The keyhole depth changes periodically corresponding to the polarity conversion period if the current is same in the electrode negative (EN) phase and electrode positive (EP) phase. There exist three distinct regimes of keyhole and weld pool behavior in the whole digging process, due to the arc pressure attenuation and energy accumulation effect. The pressure in the EP phase is smaller than that of the EN phase, causing the fluctuation of the weld pool free surface. Based on the influence mechanism of energy and momentum transaction, the arc pressure output is balanced by separately adjusting the current in each polarity. Finally, the keyhole fluctuation during the digging process is successfully reduced and welding stability is well controlled.

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“…Therefore, the special treatment of the boundary layer is required in the model. The present study adopted the LTE-diffusion approximation to deal with the above-mentioned lowtemperature sheath (Lowke and Tanaka, 2006;Jian and Wu, 2015), and considers the thermal effect of the arc to the steel ingot surface by adding the additional energy source at the interface for each phase (Tashiro et al, 2011). Generally, the heat transfer mechanism from the arc to the steel ingot surface is mainly composed of three parts: the electronic heat, the conduction heat, and the surface radiative heat.…”

Section: Arc-steel Ingot Interaction At Interface Interface Trackingmentioning

confidence: 99%

Multi-Physics Modeling of Steel Ingot Melting by Electric Arc Plasma and its Application to Electric Arc Furnace

et al. 2020

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Arc melting is one of the commonly-used melting methods in modern material manufacturing. The present study established a numerical model coupling the electric arc plasma, solid melting, and liquid flow together to simulate the steel ingot melting process using the electric arc. The direct current electric arc behavioral characteristics with varying arc length generated by the moving electrode were analyzed based on the validated model. The effects of both the initial arc length and the dynamic electrode movement on the steel ingot melting efficiency were studied. A potential method was also proposed to apply the established model in simulating the electric arc furnace scrap melting. The study reveals that a reasonable and stable arc length can provide higher instantaneous heat flux and current density and reduce the arc dissipation, meanwhile balance the electrode consumption rate and melting efficiency to achieve the highest economic benefit. In addition, the dynamic electrode movement during the melting process maintains the original arc performance near the ingot top surface, which also results in a positive impact on the melting efficiency.

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Numerical analysis of AC tungsten inert gas welding of aluminum plate in consideration of oxide layer cleaning

Cited by 17 publications

References 6 publications

Flux modification for AC-TIG braze welding of aluminium to stainless steel

Flux modification for AC-TIG braze welding of aluminium to stainless steel

Effect of Arc Pressure on the Digging Process in Variable Polarity Plasma Arc Welding of A5052P Aluminum Alloy

Multi-Physics Modeling of Steel Ingot Melting by Electric Arc Plasma and its Application to Electric Arc Furnace

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