Investigation of a single-pulse electrical arc discharge in vacuum based on the crater morphology and discharge channel

Zhu, Guang; Zhang, Min; Zhang, Qinhe; Xing, Qixuan; Yao, Zhenyang

doi:10.1007/s00170-020-05163-7

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…When the arc was obtained, the intense heat melted the base metals below the arc, thus forming a molten metal pool. A small depression was formed in the base metals, and the molten metal, called arc crater [23,24], deposited around the edge of this depression. The weld beads length was about 40 mm each, and the weldments width was approxim.…”

Section: Methodsmentioning

confidence: 99%

Effect of Post-Weld Heat-Treatment on Corrosion and Microstructure Properties of Electric Arc Welded Mild Steels

Ajide¹,

Anifalaje²,

Akande³

et al. 2023

Port. Electrochim. Acta

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Welding has been an incredibly important process used to join metals in several industrial applications, such as manufacturing, construction, automotive and aerospace sectors. It has been reported that welded joints sometimes exhibit poor corrosion resistance, due to the changes in the weld surface or HAZ chemical composition, residual stress and metallurgical structure. Therefore, there is a need to enhance welds corrosion resistance and microstructure properties through PWHT. In this study, PWHTs effect on the corrosion and microstructure properties of two MSs, SAE 1015 and 1010, which were fused by electric metal arc welding, was examined. The MS samples, with different chemical compositions, were cut to the desired dimensions, separately welded and, thereafter, subjected to PWHT, at 650, 750, 850 and 950 ºC, for 1 h. The corrosion and microstructure properties of the PWHT MS samples immersed in 3.5 wt.% NaCl were then investigated, using PDP and SEM, respectively. For the PWHT SAE 1015 and 1010 MS samples, the lowest CR values were 34.240 and 35.793 mm/year, at 650 ºC, while the highest were 90.16 and 60.10 mm/year, at 950 ºC, respectively. For the AW SAE 1015 and 1010 MS samples, the CR values were 107.54 and 118.09 mm/year, respectively. The SEM images revealed smaller grain sizes and boundaries and less porosity for PWHT MS samples at 650 ºC than for those at 950 ºC. Therefore, the first ones are recommended for advanced industrial applications.

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Section: Methodsmentioning

confidence: 99%

Effect of Post-Weld Heat-Treatment on Corrosion and Microstructure Properties of Electric Arc Welded Mild Steels

Ajide¹,

Anifalaje²,

Akande³

et al. 2023

Port. Electrochim. Acta

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“…The Tungsten electrodes were placed into the electrode holder at an angle of 60° to 80°, with the work piece placed on a at surface. The welding process was done by bringing the electrode into contact with the samples arranged in a setting to produce a butt weld, as prescribed in the studies [18,19]. The welded samples were further allowed to cool at room temperature in the open air.…”

Section: Welding Processmentioning

confidence: 99%

Assessment of Corrosion Resistance Potentials of Welded and Tempered UNS G10400 Carbon Steel in a Seawater Environment

Okuma,

Oreko

2024

Chemistry Africa

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Welded joints sometimes exhibit poor corrosion resistance, due to variation in chemical composition at the weld surface or Heat Affected Zone (HAZ), induced stress and the microstructure formation. There is a need to enhance welds corrosion resistance and microstructural properties of such joints through post weld tempering (PWT). In this study, PWT effect on the corrosion resistance and microstructure properties of UNS G10400 carbon steel was investigated. The UNS G10400 samples, were cut to the desired dimensions, welded by means of electric metal arc welding process and subjected to PWT, at 550ºC, 650ºC, and 700ºC, for 1 h, respectively. The samples were immersed in seawater environment and its corrosion resistance and microstructure properties were then evaluated, using gravimetric technique, Open Circuit Potential (OCP), Potentiodynamic Polarization (PDP), Electrochemical Impedance Spectroscopy (EIS) and Scanning Electron Microscope (SEM)/ Energy-Dispersive X-ray Spectroscopy (EDX), respectively. The ndings show that the post-weld tempered (PWT) samples exhibited higher corrosion resistance compared to the as-welded samples. The corrosion rate values are 0.1351, 0.06331, 0.06271 and 0.01578mm/year for as-welded, PWT-550 0 C, PWT-650 0 C and PWT-700 0 C samples respectively. The SEM/EDX images of PWT samples revealed an increased in grain size, forming a tempered martensite. These results are due to re-crystallization and grain growth resulting from post-weld tempering. Therefore, an appropriate post weld tempering for UNS G10400 carbon steel welded joints is recommended for advanced industrial applications.

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“…17 However, most research on crater formation has focused on the effects of electrical parameters and discharge energy on crater characteristics. Although some theoretical models have been proposed to analyze the impact of arc plasma in crater characteristics, 18,19 these models were based on ideal assumptions. Zhu et al 20 used air instead of water as the working medium, and the high-speed air medium significantly disturbed the plasma arc, which shows that the non-electrical parameters also affected the discharge craters.…”

Section: Introductionmentioning

confidence: 99%

Effects of non-electrical parameters on the characteristics of discharge craters and machining performance in short electrical arc milling

Wang

Zhou

Chen

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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During electrical discharge machining (EDM), the process parameters greatly influence the discharge characteristics and machining performance, including electrical and non-electrical parameters. As a new EDM method, short electrical arc milling (SEAM) is plagued by frequent short circuits, poor debris removal, and low energy-transfer efficiency. Therefore, this paper investigated the influence of non-electrical parameters (electrode material, working medium, and electrode rotation) on the crater characteristics, machining efficiency, and electrode wear. The micromorphological characteristics of the workpiece were explored. The results suggested that non-electrical parameters compressed and fractured the plasma channels, thus changing the effect of EDM. The air-tap water medium and electrode rotation promoted debris removal and arc breaking, which prevented the arc from ablating the workpiece. When GH4099 alloy was machined with a copper electrode, the workpiece surface quality and machining efficiency were high, and the thickness of the heat-affected zone was small. This work reveals the characteristics of short electric arc discharge and provided a theoretical basis for the efficient and high-quality machining of difficult-to-cut materials by SEAM.

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Investigation of a single-pulse electrical arc discharge in vacuum based on the crater morphology and discharge channel

Cited by 7 publications

References 13 publications

Effect of Post-Weld Heat-Treatment on Corrosion and Microstructure Properties of Electric Arc Welded Mild Steels

Effect of Post-Weld Heat-Treatment on Corrosion and Microstructure Properties of Electric Arc Welded Mild Steels

Assessment of Corrosion Resistance Potentials of Welded and Tempered UNS G10400 Carbon Steel in a Seawater Environment

Effects of non-electrical parameters on the characteristics of discharge craters and machining performance in short electrical arc milling

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