Investigation of arc stability, microstructure evolution and corrosion resistance in underwater wet FCAW of duplex stainless steel

Ma, Qiang; Luo, Chuncheng; Liu, Shixiong; Li, Hongliang; Wang, Pengfei; Liu, Duo; Lei, Yucheng

doi:10.1016/j.jmrt.2021.11.023

Cited by 18 publications

(5 citation statements)

References 23 publications

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“…2. The trajectory of working points during the welding process can be clearly observed, and the concentration degree of working points can re ect the stability of welding current and voltage [22].…”

Section: Stability Analysis Of Welding Processmentioning

confidence: 99%

Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater MIG welding

Liao¹,

Zhang²,

Li³

et al. 2022

Preprint

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In this study, 304 stainless steel which widely used in the industrial field due to its excellent thermostability, corrosion resistance and welding performance, was welded using local dry underwater pulse metal inert-gas (LDU-PMIG) welding technology. The effect of different pulse peak currents on droplet transfer behavior and weld formation was studied. The results show that short circuit transfer, globular transfer, and projected transfer could be observed in the LDU-PMIG process. With the peak current of 240A, the droplet transfer mode was short circuit transfer and globular transfer, the weld formation was irregular with large particle spatters around the weld. With the peak current increased to 260A, the droplet transfer mode changed into the globular transfer, and the weld formation quality was improved. With the peak current of 280A, the droplet transfer mode was projected transfer, the weld formation was satisfied with few spatter, and the coefficient of weld formation was the largest, projected transfer was the most stable mode. With the increase of the peak current from 300A to 320A, the droplet transfer mode did not change, but the instability of the welding arc resulted in poor weld formation with serious spatters and undercuts.

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Section: Stability Analysis Of Welding Processmentioning

confidence: 99%

Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater MIG welding

Liao¹,

Zhang²,

Li³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In the work performed by Chacón-Fernández [3], it was demonstrated that by using correct welding parameters for stainless steels, phase balance can be controlled. The most important parameters are the temperature reached, the cooling rate, and the bead geometry [13,14].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of GMAW Duplex Stainless Steels Welds

et al. 2023

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The hydrocarbon industry constantly requires a better understanding of stainless-steel welding metallurgy. Despite the fact that gas metal arc welding (GMAW) is one of the most commonly employed welding processes in the petrochemical industry, the process is characterized by the presence of a high number of variables to control in order to obtain components that are dimensionally repeatable and satisfy the functional requirements. In particular, corrosion is still a phenomenon that highly affects the performance of the exposed materials, and special attention must be paid when welding is applied. In this study, the real operating conditions of petrochemical industry were reproduced through an accelerated test in a corrosion reactor at 70 °C for 600 hours, exposing robotic GMAW samples free of defects with suitable geometry. The results show that, even if duplex stainless steels are characterized for being more corrosion resistant than other stainless steels, under these conditions it was possible to identify microstructural damage. In detail was found that the corrosion properties were strongly related to the heat input during welding and that the best corrosion properties can be obtained with the higher heat input.

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“…Some researchers have made a series of explorations on the underwater welding of duplex stainless steel. Underwater wet welding of 2205 duplex stainless steels with no cracks or slag inclusions was achieved using Ni-based self-shielded flux-cored wire and coated electrode [ 11 , 12 ]. The good weldability of local dry underwater welding of 2205 duplex stainless steel with gas metal arc welding at a water depth of 0.5 m was confirmed [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel

Shi

Wang

et al. 2023

Materials

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Duplex stainless steel welded metals were underwater local dry prepared on S32101 lean duplex stainless steel trapezoidal groove plates with a self-made drain cover employing Supercore 2205P flux-cored filler wire. Different heat inputs were employed to investigate the effects on mechanical characteristics and the microstructure of welded metals. The results demonstrated that as the heat was applied, austenite concentrations in the weld metals increased. It was found that the austenite concentration and the fraction of Σ3-austenite twin-grain boundaries followed the same trends. With increasing heat input, the recrystallized ferrite and austenite grains initially decreased and subsequently increased, whereas the fraction of interphase boundaries between special ferrite and austenite exhibited the reverse trend. With a heat input of 1.4 kJ/mm, the toughness and plasticity of the weld metals were enhanced by an increase in austenite content, Σ3 recrystallized grains, and austenite twin-grain boundaries. The plasticity and tensile strength values of the welded metal changed more when the heat input was raised from 1.0 to 1.2 kJ/mm than when it was raised from 1.2 to 1.4 kJ/mm. Considering energy conservation, it is recommended to adopt 1.2 kJ/mm for welding heat input.

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Investigation of arc stability, microstructure evolution and corrosion resistance in underwater wet FCAW of duplex stainless steel

Cited by 18 publications

References 23 publications

Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater MIG welding

Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater MIG welding

Corrosion Resistance of GMAW Duplex Stainless Steels Welds

Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel

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