New methodology for AC-pulsed GMAW parameterization applied to aluminum shipbuilding

Dutra, Jair Carlos; Silva, Régis Henrique Gonçalves e; Savi, Bruna Martinello; Marques, Cleber; Alarcon, Orestes Estevam

doi:10.1007/s40430-015-0351-3

Cited by 18 publications

(11 citation statements)

References 7 publications

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“…Joseph [13] showed that the process can be applied in a dissimilar welding process using galvanized steel with aluminum alloys. There are also studies that consider the application of AC-GMAW to thick plates Arif e Chung [14] and for single-pass butt-joint welding of structural steel AH36 [15], ller welding in butt joints with an aluminum "V" groove for the marine industry [15] and cladding of boiler walls with nickel alloy [8].…”

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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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

Self Cite

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“…Due to working in harsh environmental conditions, the characteristics of shipbuilding aluminum also outperform other types of aluminum. Shipbuilding aluminum must ensure the following characteristics [24][25][26][27]:  High durability when working in water and ensure light weight  Shipbuilding aluminum is often easy to process and process quickly  Good weldability and easy forming  In particular, shipbuilding aluminum must be characterized by high corrosion resistance and good resistance in marine environments [28][29][30][31].…”

Section: Characteristics Of Shipbuilding Aluminummentioning

confidence: 99%

A Short Communication for Shipbuilding Industry in Vietnam

Nguyen¹,

Nguyen²

2019

EJERS

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According to Shipbuilding Industry Corporation (SBIC), in 2017, shipbuilding value reached more than VND 3,071 billion, equal to 69% of the plan. Other fields have increased significantly, such as: Ship repair reached VND 488.3 billion, equal to 125% of the plan; supporting industry reached VND 264.5 billion, equal to 123% of the plan. Although shipbuilding has not reached the plan, but looking back on the period from 2008 to now, this field is always in a situation of hardship and bottomless decline because of lack of jobs, these are quite satisfactory numbers. The cause of the decline is due to the world shipping and shipbuilding industry has experienced an extremely difficult period due to the heavy influence of the world economic crisis from 2008 up to now. The Vietnamese shipbuilding and shipping industry is also not out of that situation. For the shipbuilding industry to develop, specific policies, with specific support addresses, are needed, which are well-designed and visionary shipbuilding development programs.

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“…However, an increase of deposition rate has also been notified as related to the contribution of the negative polarity, as demonstrated by Dutra et al [3] when describing the application in aluminum sailboat construction. Park et al [13] found that, with the increase in EN ratio, the drop sizes and wire melting rate increased, whereas the heat supplied to the BM decreased.…”

Section: Introductionmentioning

confidence: 97%

A contribution to the study of negative polarity in GMA welding

Li¹,

Hurtig

Högström

et al. 2017

Int J Adv Manuf Technol

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Gas metal arc welding (GMAW) using the electrode with negative polarity (DCEN) has been frequently suggested as a potential means of increasing production capacity. The objective of this work was to further study the performance of negative polarity in GMAW of carbon steels. In this project phase, bead-on-plate welds were carried out in flat position to assess the effect of different potential shielding gas compositions on bead geometry, finishing and spattering. The characteristics were compared with DCEP at the same current, but depositing the same volume of material per unit of length (more industrial related comparison). The arc length was kept the same by adjusting voltage to reach shortest arcs, yet with suitable non short-circuiting metal transfer mode. An approach to measure bead convexity was also proposed and assessed. The results showed that DCEN is feasible as a means of increasing GMAW production capacity. However, to become DCEN applicable with GMAW, the results suggest an Ar-based blend with around 6.5% of O 2 is the most appropriate shielding gas, as much as that there is a demand for a standard electronic controlled power source able to work in constant current mode.

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New methodology for AC-pulsed GMAW parameterization applied to aluminum shipbuilding

Cited by 18 publications

References 7 publications

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

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

A Short Communication for Shipbuilding Industry in Vietnam

A contribution to the study of negative polarity in GMA welding

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