Effect of plasma current on surface defects of plasma-MIG welding in cryogenic aluminum alloys

Lee, Hee-Keun; Park, Sang-hyeon; Kang, Chung Gil

doi:10.1016/j.jmatprotec.2015.04.008

Cited by 35 publications

(19 citation statements)

References 8 publications

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“…O sopro magnético é um fenômeno comum em processos de corte e de soldagem a arco elétrico. Na soldagem, o sopro magnético pode causar principalmente a deposição irregular do cordão de solda e a falta de fusão em uma de suas extremidades [10,11,12]. No corte a plasma, a ocorrência deste sopro pode gerar o corte assimétrico e a formação de respingos e rebarbas nas superfícies cortadas [13,14].…”

Section: (B) (A)unclassified

Efeito Do Sopro Magnético Na Qualidade Do Corte a Plasma Automatizado

Mougo¹,

Campos²,

Arydes³

2019

ABM Proceedings

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Resumo O desenvolvimento de tecnologias para o corte de materiais é avaliado pela qualidade do produto final. Deste modo, diz-se que um processo de corte apresenta bons resultados se este não modifica as formas e dimensões da peça e mantem suas propriedades mecânicas inalteradas. Dentre os processos de corte, o corte a plasma em chapas metálicas apresenta relevância para diversas aplicações da indústria. Sua precisão e qualidade dependem principalmente da boa execução da trajetória de corte e de sua respectiva velocidade. Neste trabalho utiliza-se um mecanismo que realiza o controle automático da ferramenta de corte e verifica-se a ocorrência do sopro magnético através da formação de rebarbas e da dureza para diferentes velocidades e alturas de corte. Os resultados demonstram os parâmetros e ajustes para cortes mais preciso, sem necessidade de acabamento ou tratamento da superfície após o corte.

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Section: (B) (A)unclassified

Efeito Do Sopro Magnético Na Qualidade Do Corte a Plasma Automatizado

Mougo¹,

Campos²,

Arydes³

2019

ABM Proceedings

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“…In addition, the HAZ width increases with higher welding current. The reason for this is that the temperature of the indirect arc and the metal droplet increases as the welding current improves [12]. The weld bead thickness increases with higher currents due to increasing wire melting rate.…”

Section: Effect Of Parameters On Weld Bead Formationmentioning

confidence: 99%

Analysis of process parameter effects during narrow-gap triple-wire gas indirect arc welding

Fang

2016

Int J Adv Manuf Technol

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Narrow-gap triple-wire gas indirect arc (TW-GIA) welding is a novel process. Previous studies have reported the process and explained how the wire arrangement affects the arc behavior and the metal transfer which correspondingly affect the sidewall fusion. In this paper, effects of process parameters on sidewall fusion, weld bead formation, microstructure, and hardness are studied, to reveal more characteristics of the narrow-gap TW-GIA. Results show that welding currents affect the sidewall penetration more significantly than groove gap and welding speed. In addition, sidewall penetration increases with larger welding currents. The heat affected zone (HAZ) width decreases with lower welding current, wider groove gap, or higher welding speed. With all the parameters, weld beads produced by narrow-gap TW-GIA present convex surfaces, which can lead to serious incomplete fusion at the weld root for the next weld layer. To solve this problem, addition of a gas tungsten arc (GTA) behind the TW-GIA is proposed. An additional benefit is that the arc pressure and extra heat input of the GTA obtain weld beads with concave surfaces.

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“…Laser welding has already been employed in the various processing and manufacturing fields due to the advantages of fast welding speed, high energy density, small welding deformation and so on [ 1 , 2 , 3 ]. Solidification cracking susceptibility could be changed during laser welding with a relatively higher welding speed compared to that of gas tungsten arc welding (GTAW), since the susceptibility can be affected by solidification behavior which depends on not only chemical composition but also on welding conditions, such as the welding speed considered as a very important factor.…”

Section: Introductionmentioning

confidence: 99%

A New Test Method for Evaluation of Solidification Cracking Susceptibility of Stainless Steel during Laser Welding

Wang

et al. 2020

Materials

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A new test method named “Trapezoidal hot” cracking test was developed to evaluate solidification cracking susceptibility of stainless steel during laser welding. The new test method was used to obtain the solidification cracking directly, and the solidification cracking susceptibility could be evaluated by the solidification cracking rate, defined as the ratio of the solidification cracking length to the weld bead length under certain conditions. The results show that with the increase in the solidification cracking rate, the solidification cracking susceptibility of SUS310 stainless steel was much higher than that of SUS316 and SUS304 stainless steels during laser welding (at a welding speed of 1.0 m/min) because a fully austenite structure appeared in the weld joint of the former steel, while the others were ferrite and austenitic mixed structures during solidification. Besides, with an increase in welding speed from 1.0 to 2.0 m/min during laser welding, the solidification cracking susceptibility of SUS310 stainless steel decreased slightly; however, there was a tendency towards an increase in the solidification cracking susceptibility of SUS304 stainless steel due to the decrease in the amount of ferrite under a higher cooling rate.

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Effect of plasma current on surface defects of plasma-MIG welding in cryogenic aluminum alloys

Cited by 35 publications

References 8 publications

Efeito Do Sopro Magnético Na Qualidade Do Corte a Plasma Automatizado

Efeito Do Sopro Magnético Na Qualidade Do Corte a Plasma Automatizado

Analysis of process parameter effects during narrow-gap triple-wire gas indirect arc welding

A New Test Method for Evaluation of Solidification Cracking Susceptibility of Stainless Steel during Laser Welding

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