Droplet transfer and spatter generation in DC–AC pulse tandem gas metal arc welding

Kang, Sang-Hoon; Kang, Minjung; Jang, Yong Hoon; Kim, Cheol-Hee

doi:10.1080/13621718.2020.1786262

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…Moreover, the momentum of droplets is positively correlated with peak current. Kang et al [15] investigated droplet transfer in tandem GMAW using DC-AC pulses, indicating that a high DC peak pulsed current enhances arc stiffness and promotes the droplet detachment. Wu et al [16] investigated the droplet transfer during DW-GMAW with double pulse and found that achieving ODPP was easier in the alternating phase, while droplet transfer stability was improved.…”

Section: Matsumoto and Sasabementioning

confidence: 99%

Influence of high-frequency pulse on droplet transfer process and weld formation in double-wire median pulsed GMAW of aluminum alloy

Wu,

Lin,

Yang

et al. 2024

Preprint

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A double-wire median pulsed gas metal arc welding (GMAW) with a high-frequency pulse waveform was developed to study the influence of a high-frequency pulse on the droplet transfer process and weld formation in aluminum (Al) alloy. The droplet transfer process was recorded using a high-speed photography system. At the same time, the influence of a high-frequency pulse at peak stage was investigated. The experimental results demonstrated that stable droplet transfer and continuous welds are obtained by incorporating high-frequency pulses. The high-frequency pulses increase electromagnetic force and facilitate premature detachment of droplets. Especially, at a high frequency of 20 kHz, one drop per pulse (ODPP) droplet transfer mode is achieved, which is the ideal mode. In addition, high-frequency pulses increase axial arc pressure, strengthen convergent flow, and reduce the effect of divergent flow, resulting in increased weld penetration while decreasing weld width and porosity.

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Section: Matsumoto and Sasabementioning

confidence: 99%

Influence of high-frequency pulse on droplet transfer process and weld formation in double-wire median pulsed GMAW of aluminum alloy

Wu,

Lin,

Yang

et al. 2024

Preprint

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“…Kang et al [17] used AC in GMAW Tandem welding with two wires, to mitigate the harmful action of the magnetic eld generated between the two arcs, stabilizing the metal transfer and increasing productivity. The versatility of this process allows for studies in the area of advanced manufacturing that investigate the bene ts of AC-GMAW, focusing on the adjustment of welding parameters based on real-time sensing and feedback control [18].…”

Section: Ac-gmaw Waveforms and En Ratiomentioning

confidence: 99%

Characterization of the effects of high-intensity negative current pulses on metal transfer and melting rate in the AC-GMAW process

Rosa

Cirino

Schaeffer

et al. 2022

Int J Adv Manuf Technol

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The use of variants of the GMAW process has become an affordable option in industry. Alternating current Gas Metal Arc Welding (AC-GMAW) arises as one of them, providing additional degrees of freedom for process controllability and versatility. This study focused on the analysis of a complex waveform of the AC-GMAW process for welding stainless steel, employed in modern synergic programs, which has not been widely disseminated in the technical literature and assessed scienti cally. The main objective was to characterize the effects of high intensity pulses in negative polarity over the process and to discuss the potential of this strategy, since it has not been used in conventional AC synergic programs. In order to bring to light information on the phenomena involved, such as the arc climbing on the wire electrode, advanced techniques of high-speed videography were used, synchronized with the acquisition of electrical welding process signals, as well as infrared thermography, to verify the evolution of the cooling of the piece after welding. The results grounded discussions on different AC-GMAW waveforms.The process´s electrical data, along with images of the arc and analysis of the wire melting and workpiece thermal behavior, showed that there was a signi cant visible increase in wire melting during the negative pulse. In addition, it evidenced how the negative electrode increment contributed to the increase in wire melting even at lower power and also showed the thermal effects on the workpiece.

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“…There are many modes of droplet transfer in MIG welding process, the transfer modes have a signi cant in uence on weld formation quality [15][16]. Therefore, researchers have conducted many studies on droplet transfer in welding process.…”

mentioning

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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Droplet transfer and spatter generation in DC–AC pulse tandem gas metal arc welding

Cited by 12 publications

References 20 publications

Influence of high-frequency pulse on droplet transfer process and weld formation in double-wire median pulsed GMAW of aluminum alloy

Influence of high-frequency pulse on droplet transfer process and weld formation in double-wire median pulsed GMAW of aluminum alloy

Characterization of the effects of high-intensity negative current pulses on metal transfer and melting rate in the AC-GMAW process

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

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