A qualitative model to explain the polarity influence on the fusion rate in the MIG/MAG process

Souza, Daniel; Resende, André Alves de; Scotti, Américo

doi:10.1080/09507110903569032

Cited by 10 publications

(16 citation statements)

References 2 publications

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“…Results from Souza et al [20] showed that the wire melting rate dropped 17% when Ar + 2%O 2 (relatively low oxidizing potential) was replaced by Ar + 18%CO 2 (relatively higher oxidizing potential) as shielding gas, confirming AWS claim. However, the melting rate was still 29% higher with DCEN than with DCEP, thus keeping the advantage of higher production with DCEN.…”

Section: Introductionsupporting

confidence: 70%

“…8, the increase of the CO 2 content decreased the arc length with DCEN, although no distinguished effect is observed with DCEP. It is important to remember that arc length in DCEN climbs the wire looking for oxides for electron field emission, as pointed out by Norrish [12], Lucas et al [9], Souza et al [20], amongst others. That is, if the wire tip becomes slenderer, arc heating has more influence on the wire melting [8].…”

Section: Resultsmentioning

confidence: 99%

“…On one hand, arc length is easily tuned by the WFS when using constant current operation mode: the faster the WFS, the shorter the arc. On the other hand, despite the intrinsic difficulties to define quantitatively an arc length [5], the negative polarity tends to have the arc root well above the droplet formation area [20]. Therefore, to compare arc length in such different conditions is not feasible.…”

Section: Methodology and Experimental Proceduresmentioning

confidence: 99%

“…Argon with CO 2 content greater than 20% and CO 2 only are unsuitable due to excessive spatter formation, per Lucas et al [9]. Souza et al [20] considered 18% CO 2 responsible for a great amount of spattering, despite of a better bead geometry.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Souza et al [20] showed that the metal transfer mode in GMAW DCEN is dependent on the type of shielding gas used, making possible to obtain transfer without repulsive drops (globular and spray). They also demonstrated and concluded that a higher wire melting rate with electrode negative is due to the arc rising up the sides of the wire tip in a search for oxides (for field emission), increasing the efficiency of heat transfer to the wire tip.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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Section: Introductionsupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Methodology and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Comparing CW-GMAW in direct current electrode positive (DCEP) and direct current electrode negative (DCEN)

Assunção

Ribeiro

Santos³

et al. 2019

Int J Adv Manuf Technol

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Evaluation of the TIG–MIG/MAG welding process in direct polarity

Costa

Resende

2020

SN Appl. Sci.

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The associations of tungsten inert gas (TIG) and metal inert gas/metal active gas (MIG/MAG) welding process intends to take advantage of the higher productivity of the MIG/MAG process with the greater heat control imposed by the TIG process. In this context, the present study aims to evaluate the effects of the TIG-MIG/MAG process with both electrodes in direct (negative) polarity in weld bead geometry. A pioneering research on TIG-MIG/MAG process was carried out for the purpose of writing this article. Therefore, weld beads were made by the conventional MIG/MAG process and by the TIG-MIG/MAG process. Two input parameters, the MIG/MAG polarity and the TIG current, were evaluated. The output responses such as bead width, reinforcement, penetration, melted area, and convexity angles were evaluated. Macrographs were performed to measure the geometrical parameters of the weld bead. The results of these measurements were evaluated by a variance analysis. The results show that the polarity variation has an influence to modify the weld bead geometry in a TIG-MIG/MAG welding process. It was also noticed that the insertion of TIG current caused the tendency to greater wettability, penetration, melted area, width, and smaller reinforcements of weld beads.

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A qualitative model to explain the polarity influence on the fusion rate in the MIG/MAG process

Cited by 10 publications

References 2 publications

A contribution to the study of negative polarity in GMA welding

A contribution to the study of negative polarity in GMA welding

Comparing CW-GMAW in direct current electrode positive (DCEP) and direct current electrode negative (DCEN)

Evaluation of the TIG–MIG/MAG welding process in direct polarity

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