Arc characteristics and behaviour of metal transfer in pulsed current GMA welding of stainless steel

Ghosh, P. K.; Dorn, Lutz; Kulkarni, Shrirang; Hofmann, Frank

doi:10.1016/j.jmatprotec.2008.03.049

Cited by 61 publications

(24 citation statements)

References 9 publications

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“…al. [10] Nesse mesmo estudo [10], observou-se também que o arco é mais estável para valores de φ menores do que para valores maiores. A estabilidade do arco é relacionada com a defl exão de sua parte mais brilhosa.…”

Section: Embasamento Teóricounclassified

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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Section: Embasamento Teóricounclassified

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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show abstract

“…The metal droplet transfer (MDT) and its stability are closely associated with the stability of welding process and weld quality. The welding parameters affect the MDT mode as well as the weld quality in P-GMAW [1,2]. Nakamura et al [3] used a high speed video camera system to study the stability of GMAW welding process.…”

Section: Introductionmentioning

confidence: 99%

Study on the thermo-effect of P-GMAW characterized by structure-borne acoustic emission signals detected in welding on aluminum alloy

Luo

Zhu

et al. 2016

Measurement

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“…Based on measurements of the time-varying welding current and arc voltage, Suban and Tušek (2003) described several methods for determining arc stability in GMAW. Ghosh et al (2009) used the optical method to study the behavior of metal transfer. Modenesi and Reis (2007) acquired droplet images using high-speed video photography.…”

Section: Introductionmentioning

confidence: 99%

Study of underwater wet welding stability using an X-ray transmission method

Guo

Feng

et al. 2015

Journal of Materials Processing Technology

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Arc characteristics and behaviour of metal transfer in pulsed current GMA welding of stainless steel

Cited by 61 publications

References 9 publications

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

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

Study on the thermo-effect of P-GMAW characterized by structure-borne acoustic emission signals detected in welding on aluminum alloy

Study of underwater wet welding stability using an X-ray transmission method

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