Study of the characteristics of duplex stainless steel activated tungsten inert gas welds

Chern, Tsann-Shyi; Tseng, Kuang-Hung; Tsai, Hung-Chin

doi:10.1016/j.matdes.2010.05.056

Cited by 140 publications

(79 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…During welding, active flux is dissociated into positive ions and negative ions. Positive ions on base material surface attracts the welding arc and negative ions cover the outer surface of the welding arc & acts as shield to cover welding arc [16,17,18]. Due to these arc gets constricted and heat of welding arc concentrated at weld region [19,20].…”

Section: ''""mentioning

confidence: 99%

Study the correlation between Microhardness, Microstructure & In-situ thermal analysis of PCATIG weldedments of Al-SiC composite

Pichumani

Raghuraman

Venkatraman

2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Section: ''""mentioning

confidence: 99%

Study the correlation between Microhardness, Microstructure & In-situ thermal analysis of PCATIG weldedments of Al-SiC composite

Pichumani

Raghuraman

Venkatraman

2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

“…The same phenomena can be achieved by adding oxygen to the shielding gas [12]. Most of the researches [13][14][15][16][17][18][19] …”

mentioning

confidence: 94%

Effects of Active Fluxes in Gas Metal Arc Welding

Varbai

Kormos²,

Májlinger³

2017

Period. Polytech. Mech. Eng.

View full text Add to dashboard Cite

In this paper the effects of active fluxes during gas metal arc welding (GMAW) Keywords Gas metal arc welding, Active flux welding, Weld geometry, Structural steel, Microstructure IntroductionNowadays the engineering industry has an increasing demand to enhance the welding technologies, in order to enable more productive and more efficient welding processes. One of the developing areas is joining thick plates with the minimum number of welding passes. Therefore deeper fusion depth is needed which increases the productivity areas, for example in case of welding high strength steels [1]). In order to increase productivity by reducing the welding passes, higher energy beam welding processes (e.g.: laser welding [2, 3], electron beam welding [4], plasma arc welding etc.) or novel welding methods (e.g.: friction stir welding [5]) can be used. In order to increase the productivity the usage of active fluxes gained attention in the recent times. By applying a thin layer of active flux on the surface prior welding, the penetration depth can be increased [6]. In case of tungsten inert gas (TIG) welding, with the usage of activated flux (A-TIG) 2-3 times deeper penetration can be achieved in Armco iron compared to the conventional TIG welding process [7]. In case of arc welding the driving force of the occurred flows in the weld pool can be originated from four different phenomena, the buoyancy, the surface-tension (which resulted in the so called Marangoni effect [7]), the high velocity movement of the arc plasma, and the Lorentz force [8,9]. Regarding the physical background of these processes, different theoretical models were established [10,11]. The models described; the vaporized ions from the flux play role in the increasing current density in the center of the welding arc, the applied flux reduces the surface tension and causes higher electric resistance, thus the size of the arc spot decreases [7]. All of the above-mentioned mechanisms have effect on the weld pool during A-TIG welding, however the main role is played by the reversed Marangoni flow [7][8][9]. The Marangoni effect is the mass transfer along an interface between two fluids due to surface tension gradient. In case of presence of active fluxes on the surface the mass transfer in the welding pool can be reversed from outward to inward which leads to reversed Marangoni flow. As a result of this inward convection the penetration depth is increasing [8,9]. The same phenomena can be achieved by adding oxygen to the shielding gas [12]. Most of the researches [13][14][15][16][17][18][19]

show abstract

“…Further research on the process of welding stainless steels has been dealt with by many researchers. Chern et al [8] investigated the effects of the specific fluxes used in the tungsten inert gas process on surface appearance, weld morphology, angular distortion, mechanical properties, and microstructures when welding duplex stainless steel. Yajiang et al [9] studied Fe 3 Al and Cr18-Ni8 steel in the tungsten inert gas arc welding process.…”

Section: Introductionmentioning

confidence: 99%

Influence of argon pollution on the weld surface morphology

et al. 2015

View full text Add to dashboard Cite

SummaryIn this paper the surfaces of butt welded joints in steel tubes were analyzed using an optical 3D measurement system to determine the morphology and topographic parameters. It was established that pollution of the argon shield gas with oxygen did not influence the width of the heat-affected zone. However, the composition of the shield gas significantly influenced the surface asymmetry, Ssk, and its inclination Sku. The measurement of these parameters enabled the selection of a higher quality surface, which was visually proven by the reduction in discoloration of the surface of the weld joint. High quality surfaces eliminate a potential habitat for bacteria and a future source of corrosion as well as providing less resistance to fluid flow.

show abstract

Study of the characteristics of duplex stainless steel activated tungsten inert gas welds

Cited by 140 publications

References 19 publications

Study the correlation between Microhardness, Microstructure & In-situ thermal analysis of PCATIG weldedments of Al-SiC composite

Study the correlation between Microhardness, Microstructure & In-situ thermal analysis of PCATIG weldedments of Al-SiC composite

Effects of Active Fluxes in Gas Metal Arc Welding

Influence of argon pollution on the weld surface morphology

Contact Info

Product

Resources

About