Symmetrical transition waveform control on double-wire MIG welding

Yao, Ping; Xue, Jiaxiang; Zhou, Kang; Wang, Xiaojun; Zhu, Qiang

doi:10.1016/j.jmatprotec.2015.08.031

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…The pulse current waveform was improved on the basis of the traditional rectangular wave by adding a platform of transition current I s, as shown in Figure 2 . The addition of the current platform has two advantages: First, it reduces the arc interruption caused by the sudden change of current [ 33 ]; second, it is beneficial for the droplet transfer because there is still a large electromagnetic contraction force, before the current turns to the base value [ 34 ]. For any single wire, all the pulse waveform parameters were fixed except for the base time (see Table 1 ), and thus the average welding current as well as the pulse frequency was determined only by the base time.…”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation of Integrated Circular Triple-Wire Pulse GMAW of Q960E High-Strength Steel for Construction Machinery

Wang

Duan³

et al. 2021

Materials

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Multi-wire welding has received much attention in the machinery industry due to its high efficiency. The aim of this study was to investigate a novel pulse gas metal arc welding (GMAW) that has circular triple-wire electrodes. The effect of the pulse phage angle on arc stability was particularly studied. Research showed that for typical phase angles the arc stability from low to high is 180°, 0°, and 120°, and the arcs are very stable at 120°. The triple-wire welding was used to weld a 9 mm thick Q960E steel, which is typically used for the arm of construction machinery. When the welding heat input was controlled at 1.26–1.56 kJ/mm, the weld zone was dominated by acicular ferrite, and the coarse-grained zone of the heat-affected zone was a mixed structure of lath martensite and lath bainite. The tensile strength of the welded joint reached 85% of the base metal and the impact toughness was above 62 J, which can meet the requirements of construction machinery. This indicates that the triple-wire welding has great potential to achieve efficient and high-quality welding for the construction machinery.

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Section: Methodsmentioning

confidence: 99%

Experimental Investigation of Integrated Circular Triple-Wire Pulse GMAW of Q960E High-Strength Steel for Construction Machinery

Wang

Duan³

et al. 2021

Materials

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“…The mutual electromagnetic force between the two electrical arcs can induce some unsteady phenomena and may change the electrical arc. If the change is very large, arc interruption, irregular metal transfer or considerable expulsion may occur during the process [15].…”

Section: Proposed Multi-frequency Double-wire Impulse Welding Methodsmentioning

confidence: 99%

“…In this method, some important parameters are selected as different factors to perform orthogonal experiments. The selection can reduce the workload and involve corresponding methods to analyze the results, so that more reliable results can be obtained [15,19,22,23].…”

Section: Experiments Of the Proposed Multi-frequency Waveform Controlmentioning

confidence: 99%

Research of a Multi-Frequency Waveform Control Method on Double-Wire MIG Arc Welding

Yao

Zhou

2017

Applied Sciences

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Abstract:To improve the energy efficiency and quality of the welding seam during the double-wire metal inert-gas (MIG) arc welding production, a new multi-frequency waveform control method was proposed in this paper. In this method, a multi-frequency modulation was added to the waveform in the peak stage of trailing wire current, under the situation that the two wires current waveforms had the same frequencies but inverse phases. This new action can benefit the stability of welding process and improve the quality of welding seam. Actual experiments were conducted to validate the proposed method. Orthogonal experiments and corresponding mathematical analyses were also employed to seek an optimal parameters combination. Finally, an optimal combination was confirmed and a welding seam with satisfactory quality was obtained, which showed that the proposed control method and corresponding analyses can well serve the double-wire MIG arc welding, and then benefit the actual production in the future.

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“…The welding technology test platform uses the intelligent digital signal processing (DSP) arc welding power source as the core. This is a fully functional and relatively complex system that can realize the real-time adjustment and optimization of multiple welding parameters and peripheral welding equipment [31]. Applied to a traditional gas-protected welding system, the method of molten pool blown by a compensatory gas jet should solve the problem of establishing and controlling the new gas flow branches without affecting the adjustment and control of the main gas flow path.…”

Section: Experimental Materials and Equipmentmentioning

confidence: 99%

High-Speed Welding of Stainless Steel with Additional Compensatory Gas Jet Blow Molten Pool

et al. 2018

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To avoid humping bead defects in high-speed welding, this paper proposes the method of an additional and compensatory gas jet blow molten pool. A pulsed metal inert gas high-speed welding test platform was constructed for compensatory gas jet blow molten pool. A total of 304 stainless steel sheets were used as the welding workpieces under equal heat inputs. Two high-speed butt welding processes were conducted and compared, in which the workpieces were welded with and without compensatory gas jets at 154 cm/min and 167 cm/min, respectively. After high-speed welding with compensatory gas jet blow, the weld appearance was straight, uniform, and high-quality, with no humping bead or undercut defects. The macroscopic morphologies and microstructures of cross-sections of the weld at the toe, near the surface, the middle, and the bottom portion all showed the stirring effect of the gas jet on the molten pool and improved grain refinement degrees. Hardness was enhanced in the weld center and the heat-affected zone. At welding speeds of 154 cm/min and 167 cm/min, the fracture load capacities of the welds were increased by 24.9 and 10.4%, respectively.

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Symmetrical transition waveform control on double-wire MIG welding

Cited by 21 publications

References 11 publications

Experimental Investigation of Integrated Circular Triple-Wire Pulse GMAW of Q960E High-Strength Steel for Construction Machinery

Experimental Investigation of Integrated Circular Triple-Wire Pulse GMAW of Q960E High-Strength Steel for Construction Machinery

Research of a Multi-Frequency Waveform Control Method on Double-Wire MIG Arc Welding

High-Speed Welding of Stainless Steel with Additional Compensatory Gas Jet Blow Molten Pool

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