A comparison of the swing and non-swing arc behavior in arc ultrasonic assisted narrow gap GMAW

Chen, Qihao; Xie, Zhibin; Wang, Jiayou; Lin, Sanbao; Dou, Qin; Huang, T.

doi:10.1016/j.jmrt.2023.04.095

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…At the end of welding, the cooling shrinkage of the heated metal is also hindered by the colder metal around it, causing the compressive stress at that location to gradually transform into tensile stress. 30 The metal in the middle of the weld is subjected to the greatest constraint, so the tensile stress peak always appears in the middle of the weld, while the metal at both ends of the workpiece can expand and contract freely in the longitudinal direction, so the stress at both ends is almost zero. As the speed decreases, there is a significant decrease in the stress peaks on both sides of the weld, especially in 6063 aluminum alloy.…”

Section: Numerical Simulation Results and Analysismentioning

confidence: 99%

Numerical simulation and experimental study of residual stress in dissimilar aluminum alloy laser composite welding

Chen,

Tang,

Xie

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The study combined experimental and numerical simulation methods to investigate the distribution of residual stress in laser composite welding of dissimilar aluminum alloys 6063 and 5083. Using the Simufact Welding simulation software and a combined volume heat source, the distribution patterns of transverse and longitudinal residual stress fields at different welding speeds were analyzed. The blind hole method was used to test the residual stress after welding. The results showed that the use of a combined volume heat source model for heat source calibration yielded ideal results, and the thermal cycle curve was basically consistent with the simulation and experimental results of residual stress. As the welding speed decreased, the longitudinal residual stress of the parent material on both sides significantly decreased, while the transverse residual stress increased. The majority of tensile and compressive stresses on both sides of the 5083 and 6063 aluminum alloys decreased with a decrease in welding speed. The Von Mises equivalent stress indicated that the cooling process is the main stage for residual stress generation. When the welding speed decreased, the peak value of longitudinal residual stress on the 6063 aluminum alloy side decreased from 230 to 90 MPa, while that on the 5083 aluminum alloy side decreased from 304 to 150 MPa. These findings provide an important basis for controlling and reducing the residual stress and deformation of dissimilar aluminum alloy laser arc composite welded components.

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Section: Numerical Simulation Results and Analysismentioning

confidence: 99%

Numerical simulation and experimental study of residual stress in dissimilar aluminum alloy laser composite welding

Chen,

Tang,

Xie

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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show abstract

“…Detailed and in-depth research on arc behavior and droplet transition is imperative for the accurate control of weld bead forming and quality [29]. Chen et al [30] made a comparison of the swing and non-swing arc behavior in arc ultrasonic-assisted narrow-gap GMAW, and they found that under the assistance of the ultrasonic method, the arc shape could be an improvement to increase sidewall penetration. Song et al [31] pointed out that the mode of droplet and the arc swing angle have a great influence on the stability of the deposition process and shape in "TIG + AC" twin-tire cross arc additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Effects of Oscillation Width on Arc Characteristics and Droplet Transfer in Vertical Oscillation Arc Narrow-Gap P-GMAW of X80 Steel

Liu

Xue

Zhou

et al. 2023

Metals

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In fields, such as oil and gas pipelines and nuclear power, narrow-gap welding has often been used for the connection of thick and medium-thick plates. During the welding process, a lack of fusion was prone to occur due to groove size limitations, seriously affecting the service safety of large structures. The vertical oscillation arc pulsed gas metal arc welding (P-GMAW) method was adopted for narrow-gap welding in this study. The influence of the oscillation width on arc morphology, droplet transfer behavior and weld formation during narrow-gap welding was studied. Oscillation widths from 0 to 4 mm were used to weld narrow-gap grooves with a bottom width of 6 mm. The results show that, in non-oscillation arc welding, the arc always presented a bell cover shape, and the droplet transfer was in the form of one droplet per pulse, while the sidewall penetration of the weld was relatively small, making it prone to a lack of fusion. With an increase in the oscillation width, the arc gradually shifted to the sidewall. The droplet transfer mode was a mixed transfer of large and small droplets, and the sidewall penetration continued to increase, which was conducive to the fusion of the sidewall. However, when the oscillation width was wider than 3 mm, it led to the phenomenon of the arc climbing to the sidewall, and the weld was prone to porosity, undercutting and other welding defects. The oscillation width has a major impact on the stability of the welding process in vertical oscillation arc narrow-gap welding.

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“…The 5xxx series aluminum-magnesium alloys are widely concerned and employed in shipbuilding, aerospace, and industry manufacturing by virtue of their excellent toughness, weldability, strength-to-weight ratio, and corrosion resistance [1][2][3][4]. These Al-Mg alloys are generally regarded as the predominant alternative to steel structures [5].…”

Section: Introductionmentioning

confidence: 99%

Precipitation Behavior and Corrosion Properties of Stirred Zone in FSWed AA5083 Al-Mg Alloy after Sensitization

Gao,

Ning,

et al. 2023

Metals

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This paper investigated the Mg-rich phase precipitation behavior and the corrosion performance throughout the thickness direction within the stirred zone (SZ) of friction stir welded (FSW) AA5083 alloy after 175 °C/100 h sensitization. For the as-welded SZ, the recrystallized grain size gradually decreased from the top surface (5.5 μm) to the bottom (3.7 μm). The top and bottom of the SZ maintained relatively high levels of deformed grains and accumulated strain induced by either shoulder pressing or pin stirring. After 175 °C/100 h sensitization, 100 nm thick β′-Al3Mg2 precipitates were present along the grain boundaries (GBs) in the SZ. The bottom of the SZ exhibited more continuous precipitates along GBs due to the fine grain size and the large fraction of high-angle grain boundaries (0.724%). Although the as-welded SZ exhibited excellent corrosion resistance, it became extremely vulnerable to intergranular cracking (IGC) and stress corrosion cracking (SCC) after sensitization. The large SCC susceptibility indices of the SZ samples ranged from 66.9% to 73.1%. These findings suggest that sensitization can strongly deteriorate the corrosion resistance of the Al-Mg FSW joint, which is of critical importance for the safety and reliability of marine applications.

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A comparison of the swing and non-swing arc behavior in arc ultrasonic assisted narrow gap GMAW

Cited by 4 publications

References 21 publications

Numerical simulation and experimental study of residual stress in dissimilar aluminum alloy laser composite welding

Numerical simulation and experimental study of residual stress in dissimilar aluminum alloy laser composite welding

Effects of Oscillation Width on Arc Characteristics and Droplet Transfer in Vertical Oscillation Arc Narrow-Gap P-GMAW of X80 Steel

Precipitation Behavior and Corrosion Properties of Stirred Zone in FSWed AA5083 Al-Mg Alloy after Sensitization

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