Prediction of the Weld Pool Stability by Material Flow Behavior of the Perforated Weld Pool

Lang, Ruiqing; Han, Yongquan; Bai, Xueyu; Hocheng, H.

doi:10.3390/ma13020303

Cited by 13 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The early studies only correlated the arc pressure with the square of the welding current [ 26 , 27 ]. Though Li et al [ 28 ] and Lang et al [ 29 ] proposed other factors such as density, the nozzle exit area, and plasma gas flow rate, their formulae were suitable for the conventional PAW. Equation (12) is for the U-PAW process.…”

Section: Formula Of Plasma Arc Pressure In U-pawmentioning

confidence: 99%

Numerical Analysis of Keyhole and Weld Pool Behaviors in Ultrasonic-Assisted Plasma Arc Welding Process

Qiao

2021

Materials

View full text Add to dashboard Cite

The acoustic radiation force driving the plasma jet and the ultrasound reflection at the plasma arc-weld pool interface are considered to modify the formulas of gas shear stress and plasma arc pressure on the anode surface in ultrasonic-assisted plasma arc welding (U-PAW). A transient model taking into account the dynamic changes of heat flux, gas shear stress, and arc pressure on the keyhole wall is developed. The keyhole and weld pool behaviors are numerically simulated to predict the heat transfer and fluid flow in the weld pool and dynamic keyhole evolution process. The model is experimentally validated. The simulation results show that the acoustic radiation force increases the plasma arc velocity, and then increases both the plasma arc pressure and the gas shear stress on the keyhole wall, so that the keyholing capability is enhanced in U-PAW.

show abstract

Section: Formula Of Plasma Arc Pressure In U-pawmentioning

confidence: 99%

Numerical Analysis of Keyhole and Weld Pool Behaviors in Ultrasonic-Assisted Plasma Arc Welding Process

Qiao

2021

Materials

View full text Add to dashboard Cite

show abstract

“…Variable polarity plasma arc (VPPA) welding gained widespread application in the field of aluminum alloy structural connections due to its cathode cleaning effect and concentrated arc energy characteristics [1][2][3][4][5][6]. Compared to traditional arc welding techniques, VPPA welding, with its unique keyhole welding mode, effectively eliminates porosity, resulting in superior welding quality and properties of welding bead [7].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Gravitational Influence on Weld Pool Behavior and Weld Bead Performance in Variable Polarity Plasma Arc Welding across Different Welding Position

Liu,

Jiang,

Chen

et al. 2023

Materials

View full text Add to dashboard Cite

This article comprehensively explores the cross-scale effects of gravity on macroscopic flow formation and weld bead formation in variable polarity plasma arc welding. Gravity-induced changes in welding direction were achieved through welding at different spatial positions. The properties of the weld bead were investigated at various spatial locations. Additionally, an elemental tracing technique was employed to study the internal flow behavior of molten metal. In the flat welding position, there is an observable trend of increasing grain size in the welded bead, accompanied by a significant expansion of the coarse grain zone. Consequently, the properties of the weld bead in the flat position are inferior to those achieved in the vertical welding position. This phenomenon can be attributed to the accumulation of molten metal at the exit side of the keyhole, resulting in temperature accumulation. Research indicates that the internal flow within the weld pool plays a critical role in causing this phenomenon. The study’s findings reveal the presence of two distinct vortex flow patterns within the weld pool: one aligned with the welding direction and the other directed towards the interior of the weld pool. Particularly noteworthy is the substantial expansion of the flow channel area in the flat welding position, which significantly amplifies the impact of internal flow. This enhanced flow intensity inevitably leads to the increased buildup of molten metal at the keyhole exit side. These studies lay the groundwork for achieving high-quality and controllable spatial-position welding.

show abstract

“…Xu et al [41] optimized the oscillating parameters in narrow-gap GMA welding via simulation. Additionally, Lang et al [42] predicted the molten pool stability during variable polarity plasma arc welding (VPPAW).…”

Section: Introductionmentioning

confidence: 99%

Molten Pool Behaviors in Double-Sided Pulsed GMAW of T-Joint: A Numerical Study

Zhang

Wang

Lin

2021

Metals

View full text Add to dashboard Cite

The T-joint is one of the essential types of joints in aluminum welded structures. Double-sided welding is a preferable solution to maintain high efficiency and avoid significant distortion during T-joint welding. However, interactions between double-sided molten pools make flow behaviors complicated during welding. Numerical simulations regarding molten pool behaviors were conducted in this research to understand the complex flow phenomenon. The influences of wire feed rates and torch distances were simulated and discussed. The results show that droplet impinging drives the fluid to flow down to the root and form a frontward vortex. Marangoni stress forces the fluid to form an outward vortex near the molten pool boundary and flatten the concave-shaped molten pool surface. With an increased wire feed speed, the volume of the molten pool increases, and the root fusion is improved. With an increased torch distance, the width of the front molten pool decreases while the length increases, and the rear molten pool size decreases slightly. Both wire feed speeds and the torch distances have limited influences on the basic flow characteristics.

show abstract

Prediction of the Weld Pool Stability by Material Flow Behavior of the Perforated Weld Pool

Cited by 13 publications

References 27 publications

Numerical Analysis of Keyhole and Weld Pool Behaviors in Ultrasonic-Assisted Plasma Arc Welding Process

Numerical Analysis of Keyhole and Weld Pool Behaviors in Ultrasonic-Assisted Plasma Arc Welding Process

Mechanisms of Gravitational Influence on Weld Pool Behavior and Weld Bead Performance in Variable Polarity Plasma Arc Welding across Different Welding Position

Molten Pool Behaviors in Double-Sided Pulsed GMAW of T-Joint: A Numerical Study

Contact Info

Product

Resources

About