Arc characteristics and behaviour of metal transfer in pulsed current GMA welding of aluminium alloy

Ghosh, P. K.; Dorn, Lutz; Hübner, Marc P.; Goyal, V.K.

doi:10.1016/j.jmatprotec.2007.04.113

Cited by 78 publications

(46 citation statements)

References 13 publications

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“…The research [9] revealed an increased arc voltage with different shielding gases, which displayed obvious arc constriction. Secondly, some results indicate significant constriction with the pulsed welding process [10,11]. Previous work indicates that the root radius decreased during pulsed arc welding [12], and the attenuation coefficient of the magnetic force is defined to evaluate the intensity of the arc constriction, even though it was a direct reflection of the constriction view.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, conventional and pulsed frequencies of 20 and 40 kHz, both under currents of 60 and 80 A, are used in the GTAW, and the video information is obtained. with the pulsed welding process [10,11]. Previous work indicates that the root radius decreased during pulsed arc welding [12], and the attenuation coefficient of the magnetic force is defined to evaluate the intensity of the arc constriction, even though it was a direct reflection of the constriction view.…”

Section: Introductionmentioning

confidence: 99%

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Arc Shape Characteristics with Ultra-High-Frequency Pulsed Arc Welding

Yang

Zheng

2017

Applied Sciences

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Arc plasma possesses a constriction phenomenon with a pulsed current. The constriction is created by the Lorentz force, the radial electromagnetic force during arc welding, which determines the energy distribution of the arc plasma. Welding experiments were carried out with ultra-high-frequency pulsed arc welding (UHFP-AW). Ultra-high-speed camera observations were produced for arc surveillance. Hue-saturation-intensity (HSI) image analysis was used to distinguish the regions of the arc plasma that represented the heat energy distribution. The measurement of arc regions indicated that, with an ultra-high-frequency pulsed arc, the constriction was not only within the decreased arc geometry, but also within the constricted arc core region. This can be checked by the ratio of the core region to the total area. The arc core region expanded significantly at 40 kHz at 60 A. A current level of 80 A caused a decrease in the total region of the arc. Meanwhile, the ratio of the core region to the total increased. It can be concluded that arc constriction depends on the increased area of the core region with the pulsed current (>20 kHz).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Arc Shape Characteristics with Ultra-High-Frequency Pulsed Arc Welding

Yang

Zheng

2017

Applied Sciences

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“…Isso envolve os parâmetros de pulso como corrente média (I m ), corrente de pico (I p ), corrente de base (I b ), tempo de pico (t p ), tempo de base (t b ), frequência de pulso (f), assim como a tensão do arco (V). Entretanto, a difi culdade em se controlar os parâmetros de soldagem em P-GMAW pode ser amenizada ao se considerar a infl uência de um fator hipotético φ (Equação 1) derivado do conceito de balanço de energia [9]: Em Ghosh, P et. al.…”

Section: Embasamento Teóricounclassified

“…Procedimentos empíricos levaram à conclusão que quanto maior ϕ e I m , menor a pressão do arco (vide Figura 2). derivado do conceito de balanço de energia [9]:…”

Section: Embasamento Teóricounclassified

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Análise da oscilação da poça de solda em P-GMAW por meio de processamento de imagens obtidas por perfilografia

Ramos¹,

Carvalho²,

Alfaro³

2013

Soldag. insp.

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ResumoEste artigo apresenta uma metodologia de estudo da oscilação da poça de Abstract: This paper presents a methodology for studying the weld pool oscillation by means of measuring its oscillation frequencies using both the welding voltage signal and the analysis of weld pool profile images. The intense arc brightness is reduced by using the technique of shadowgraphy and images are obtained at 1000 frames per second by a high speed CMOS camera. The geometry of the pool is viewed in profile and frequency spectra are obtained by Fast Fourier Transform using MATLAB image processing.The methodology was applied to analyze the weld pool oscillatory behavior that results from a pulsed GMA welding process. Two different welding current pulse types were tested: a) the conventional trapezoidal pulse (with only one level of peak current) and b) the trapezoidal pulse with the so called "detaching current" (the welding current presents a modified trapezoidal shape, in which, at the end of the peak current time, the welding current is reduced to an intermediary level and kept in that during some time, after which it reduces further to the background current level). The results show that it is possible to measure the puddle oscillation using this methodology and, also, that the measurement by images present itself as more reliable than the analysis by the voltage signal.

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