Gaussian Pulsed Current Waveform Welding for Aluminum Alloys

Zhu, Qiang; Xue, Jiaxiang; Yao, Ping; Dong, Changwen; Wang, Leilei; Heng, Gongchun; Li, Zhihui

doi:10.1080/10426914.2014.973603

Cited by 16 publications

(5 citation statements)

References 11 publications

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“…The respective compositions of each material used in this study are provided in Table 1. A pulsed GMAW with good stability was employed to obtain a different average current, which changes within a wide range by adjusting the base current, as displayed in Figure 1b [21,22], and the parameters for welding are presented in Table 2. Pure argon was coaxially supplied as a shielding gas at a flow rate of 18 L/min.…”

Section: Methodsmentioning

confidence: 99%

Mechanism of the Influence of Weld Pool Wall Constraint on Weld Profile Formation in Gas Metal Arc Welding of Aluminum Alloy

et al. 2022

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This paper aims to clarify the influence of the wall constraint on the convection behavior of molten metal in a molten pool and improve the weld formation and mechanical property. In this paper, the flow behavior of molten metal under the action of weld pool wall constraint and driving forces is studied; especially, the mechanism of weld pool wall constraint on the flow behavior of molten metal and its influence on the weld formation are studied and verified. Additionally, the influence of convection behavior on the composition distribution and properties of weld are explored. The results show that the bottom wall of the molten pool has the function of constraint on the molten metal, which directly determines the profile and size of the upper and lower reinforcement of the weld. Therefore, the reinforcement forming coefficient Rc is proposed to value the diversion ability of the bottom wall. Meanwhile, the EDS results demonstrate that the flow pattern of molten metal has a significant effect on the distribution of the weld composition for different profiles of weld. For the weld with depressed upper reinforcement, its mechanical properties can be significantly improved because of its enhanced wall constraint when the supporting plate is added.

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Section: Methodsmentioning

confidence: 99%

Mechanism of the Influence of Weld Pool Wall Constraint on Weld Profile Formation in Gas Metal Arc Welding of Aluminum Alloy

et al. 2022

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“…Table 2 shows the main welding parameters of DP-GMAW. Electrical signals throughout the experiment were collected and were disposed for offline analysis by the arc dynamic waveform wavelet analyzer [20]. The experimental setup of the current research is shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Effects of Thermal Frequency on Microstructures, Mechanical and Corrosion Properties of AA6061 Joints

et al. 2018

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Three thermal frequencies that were designated as 3, 4, and 5 Hz were used to reveal the microstructural evolution, mechanical, and corrosion properties of AA6061-T6 sheets that were welded by double pulsed gas metal arc welding (DP-GMAW) using microstructural observations, microhardness tests, tensile tests, bend tests, impact tests, and corrosion tests. A self-developed welding system consisted of a digital multifunctional welder and an arc dynamic waveform wavelet analyzer was chosen to perform welding operations and to record electrical signal waveforms during the welding process. The results show that the process of DP-GMAW was stable, and the weld beads exhibited aesthetic ripples. The ripple distance, the grain size, and porosity of the fusion zone decreased with an increasing thermal frequency. Microhardness and corrosion properties of the weld joint improved when the thermal frequency increased. In addition, all of the joints exhibited excellent bending properties. However, the impact property of the weld joint was lower than that of the BM. It indicated that the low impact energy results of the welded AA6061-T6 sheet were mainly due to the formation of micro-cracks in the fusion zone.

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“…At present, the current research on DP-GMAW is mainly focuses on the following two aspects: reducing the heat input and increasing the stirring effect of the molten pool. First, the heat input during the welding process can be reduced by using different current waveforms, such as median pulsed current waveform [15], trapezoidal wave-modulated current waveform [16], and gaussian pulsed current waveform [17]. Wu et al [18] introduced a dual-wire DP-GMAW with a median current waveform based on the conventional rectangular pulse and found that changed the median current, the average welding current also changed.…”

Section: Introductionmentioning

confidence: 99%

Effect of low heat-input double-pulse gas metal arc welding on weld formation and microstructure of 6061 aluminium alloy

Xue

Shen

et al. 2022

Science and Technology of Welding and Joining

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Double-pulse gas metal arc welding (DP-GMAW) is a common low-melting-point metal welding method. In this study, a low heat-input double-pulse gas metal arc welding (LHDP-GMAW) was proposed based on DP-GMAW. The welding process stability, weld bead shape, microstructure, and microhardness of 6061 aluminium alloy welding were analyzed for DP-GMAW and LHDP-GMAW with different low-frequency (3, 5 and 7 Hz). Compared with DP-GMAW, the stirring effect of alternating strong and weak pulses on the molten pool of LHDP-GMAW is enhanced and the heat input is reduced. Therefore, the LHDP-GMAW can produce more obvious fish-scale ripples, lower penetration, smaller and more uniform grains, and higher microhardness. This study provides a new solution for improving the welding quality of low-melting-point metal.

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Gaussian Pulsed Current Waveform Welding for Aluminum Alloys

Cited by 16 publications

References 11 publications

Mechanism of the Influence of Weld Pool Wall Constraint on Weld Profile Formation in Gas Metal Arc Welding of Aluminum Alloy

Mechanism of the Influence of Weld Pool Wall Constraint on Weld Profile Formation in Gas Metal Arc Welding of Aluminum Alloy

Effects of Thermal Frequency on Microstructures, Mechanical and Corrosion Properties of AA6061 Joints

Effect of low heat-input double-pulse gas metal arc welding on weld formation and microstructure of 6061 aluminium alloy

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