Computational modeling of stationary gastungsten-arc weld pools and comparison to stainless steel 304 experimental results

Zacharia, T.; David, S. A.; Vitek, J.M.; Kraus, Hal G.

doi:10.1007/bf02652489

Cited by 49 publications

(15 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For steels, it has been suggested that surface tension-driven Marangoni forces dominate the melt pool flow 13 , and is a key to determining the shape and penetration of the solidified joint. It may also have an influence on the final residual stresses, and can set the conditions for the origin of defects in welded joints 14–25 or additively formed components 2,3 .…”

Section: Introductionmentioning

confidence: 99%

Revealing internal flow behaviour in arc welding and additive manufacturing of metals

et al. 2018

View full text Add to dashboard Cite

Internal flow behaviour during melt-pool-based metal manufacturing remains unclear and hinders progression to process optimisation. In this contribution, we present direct time-resolved imaging of melt pool flow dynamics from a high-energy synchrotron radiation experiment. We track internal flow streams during arc welding of steel and measure instantaneous flow velocities ranging from 0.1 m s−1 to 0.5 m s−1. When the temperature-dependent surface tension coefficient is negative, bulk turbulence is the main flow mechanism and the critical velocity for surface turbulence is below the limits identified in previous theoretical studies. When the alloy exhibits a positive temperature-dependent surface tension coefficient, surface turbulence occurs and derisory oxides can be entrapped within the subsequent solid as result of higher flow velocities. The widely used arc welding and the emerging arc additive manufacturing routes can be optimised by controlling internal melt flow through adjusting surface active elements.

show abstract

Section: Introductionmentioning

confidence: 99%

Revealing internal flow behaviour in arc welding and additive manufacturing of metals

et al. 2018

View full text Add to dashboard Cite

show abstract

“…For GTAW, convection in the weld pool is driven by a combination of forces, which include the surface tension force, buoyancy force, electromagnetic force and arc drag force. In most cases, the fluid flow and heat transfer in the weld pool are controlled by the surface-tension force [7]. Gas metal arc welding (GMAW) is an arc welding process that uses an arc between a continuous, consumable filler metal electrode and the weld pool (figure 1).…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of globular metal transfer in gas metal arc welding - a comparison of numerical and experimental results

Fan¹,

Kovacevic²

1998

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A mathematical model to describe the globular transfer in gas metal arc welding is developed. This work is both theoretical and experimental. Using the volume-of-fluid (VOF) method, the fluid-flow and heat-transfer phenomena during the impingement of a droplet on a solid substrate, arc striking, the impingement of multiple droplets on the molten pool and finally the solidification after the arc extinguishes are dynamically studied. A He-Ne laser in conjunction with the shadow-graphing technique is used to observe the metal-transfer processes. Theoretical predictions and experimental results are shown to be in good agreement, suggesting that the theoretical treatment of the model is sound.

show abstract

“…지금까지 초음파 용접에서 용접 시간이나 초음파 진폭 및 압력 등의 용접조건이 용착성에 미 치는 실험적 연구 [2,3] 나 두 접촉면 사이의 온도에 대한 연구가 이루 어져 왔으며 특히 용접부에서 발생하는 온도를 측정하는 것은 열영 [4][5][6] .…”

Section: 초음파 용착이 이루어지는 동안 소성변형(Plastic Deformation)unclassified

Temperature Distribution Analysis of Welding Parts in Ultrasonic Welding by Using FEM

Kang¹,

Kyung-Tak²

2016

Journal of the Korean Society of Manufacturing Technology Engin

View full text Add to dashboard Cite

ARTICLE INFO ABSTRACTArticle history:Ultrasonic metal welding, unlike the conventional welding techniques, does not require an external heat source, welding rod, or filler metal. Therefore, ultrasonic metal welding is not only economical but also environment-friendly, and hence, it has been receiving much attention. In ultrasonic welding, heat is generated because of the plastic deformation and the friction between both surfaces of the welded materials. It is important to identify the heat-affected zone by measuring the temperature generated at the weld. In this study, the effects of the welding pressure, welding time, and vibration amplitude on the temperature distribution in the weld were evaluated by performing a transient thermal analysis of the heat generated during ultrasonic metal welding. The experimental results indicated that the temperature of the weld tends to increase with the welding time and vibration amplitude. However, an increase in the pressure does not affect the temperature of the weld largely.

show abstract

Computational modeling of stationary gastungsten-arc weld pools and comparison to stainless steel 304 experimental results

Cited by 49 publications

References 15 publications

Revealing internal flow behaviour in arc welding and additive manufacturing of metals

Revealing internal flow behaviour in arc welding and additive manufacturing of metals

Dynamic analysis of globular metal transfer in gas metal arc welding - a comparison of numerical and experimental results

Temperature Distribution Analysis of Welding Parts in Ultrasonic Welding by Using FEM

Contact Info

Product

Resources

About