Study on welding process and prosperities of AA5754 Al-alloy welded by double pulsed gas metal arc welding

Liu, Anhua; Tang, Xinhua; Lu, Fenggui

doi:10.1016/j.matdes.2013.02.087

Cited by 86 publications

(35 citation statements)

References 19 publications

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“…They concluded that high laser force improved the geometry and mechanical properties of the weld seam and also the porosities in the weld seam, and the increase in the laser power decreased the amount of porosity. In their study, Liu et al [24] welded AA5754 alloy by using the double pulsed gas metal arc welding (DP-GMAW) method and investigated the metallic drop transfer, weld pool profile, and the weld seam geometry, as well as the alloy's mechanical properties. They stated that the increase in the wire feed speed increased penetration.…”

Section: Introductionmentioning

confidence: 99%

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

Çevik¹,

Koç²

2021

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AA5754 aluminium alloys are commonly used in marine and offshore applications as well as in shipbuilding equipment. It is of great importance to weld this alloy in these industrial areas. This study investigated the penetration, microstructure, and mechanical properties of AA5754 Al alloy sheets that were joined using robotic metal inert gas (MIG) welding at different welding speeds. The joints were welded at three welding speeds by keeping the welding current constant, and then macrostructure and microstructure of the samples taken from these joints were examined. Afterward, their hardness, tensile and bending tests were carried out. It was found that the increase in the welding speed decreased the amount of accumulated metal and the penetration rate. Formation of macro-and micro-porosities was observed in the root sections of the weld seams. It appeared that the welding speed increased, the quantity and size of these defects increased, and the mechanical properties were negatively affected by the increase in the welding speed.

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Section: Introductionmentioning

confidence: 99%

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

Çevik¹,

Koç²

2021

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“…Richardson et al [10] found that current pulses could not be used to trigger weld pool oscillation effectively for GMAW, the interactions between the transferred droplets and the weld pool can trigger the weld pool into oscillation. Tang et al [11] developed a filter-reflection observation system to acquire the weld pool profile during double-pulsed gas metal arc welding process. It was found that the weld pool oscillation caused by low frequency pulse can effectively reduce the porosity and refine the weld structure.…”

Section: Introductionmentioning

confidence: 99%

Study on Short-Circuiting GMAW Pool Behavior and Microstructure of the Weld with Different Waveform Control Methods

Chen

Xue

Wang

et al. 2019

Metals

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In order to study internal relation among the behavior of the weld pool, the microstructure of weld bead and the waveform of short-circuiting gas metal arc welding (S-GMAW), a high speed photograph-images analysis system was formed to extract characteristics of weld pool behavior. Three representative waveform control methods were used to provide partly and fully penetrated weld pools and beads. It was found that the behavior of the weld pool was related to the instantaneous power density of the liquid bridge at the break-up time. Weld pool oscillation was triggered by the explosion of the liquid bridge, the natural oscillation frequencies were derived by the continuous wavelet transform. The change of weld pool state caused the transition of oscillation mode, and it led to different nature oscillation frequencies between partial and full penetration. Slags flow pattern could be an indication of the weld pool flow. Compared with the scattered slags on fully penetrated weld pool, slag particles accumulated on partially penetrated weld pools. The oscillating promoted the convection of the welding pool and resulted in larger melting width and depth, the grain size, and the content of pro-eutectoid ferrite in the weld microstructure of S235JR increased, the content of acicular ferrite decreased.

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“…Important parameters of DP-MIG are high frequency, delta wire feeding speed and duty cycle. The high frequency is adjusted to ensure one droplet transfer per pulse [1][2]. While a delta wire feeding speed is changing the size of droplets [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The high frequency is adjusted to ensure one droplet transfer per pulse [1][2]. While a delta wire feeding speed is changing the size of droplets [1][2][3][4]. In pulse stage can be adjusted by changing a duty cycle period to obtaining the shape of metal droplets in pulse and transfer mode for weld bead shape [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Double Pulse MIG Welding on Porosity Formation on Aluminium 5083 Fillet Joint

2019

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In this article, parameters of Double-Pulse Metal Inert Gas Welding (DP-MIG) was used for minimising a porosity formation in a T-joint fillet weld. AA5083-H112 aluminium alloy (Non-heat treatable series) with the plate thickness of 10 millimetres is base metal for this study. Welding consumables were filler wire ER5356 with a diameter of 1.2 millimetres and shielded by industrial argon gas. Three majorities parameter of DP-MIG were Delta wire feed (m/min), Frequency (Hz) and Duty cycle (%). Measurable signal current pattern and opened porosity on the fractured surface were couple observed to study their relationships. An appropriate image processing technique was employed to quantitative measuring and calculating a size grouping area of several opened porosities overall weld length, precisely. The result found that the optimal was used a low-level of Delta wire feed of 0.8 m/min, a high-level of a frequency of 5.0 Hz, a mid-level of the duty cycle 30 % and a high travel speed 60 cm/min could minimise the porosity formation with complete penetration.

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Study on welding process and prosperities of AA5754 Al-alloy welded by double pulsed gas metal arc welding

Cited by 86 publications

References 19 publications

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

The effects of welding speed on the microstructure and mechanical properties of marine-grade aluminium (AA5754) alloy welded using MIG welding

Study on Short-Circuiting GMAW Pool Behavior and Microstructure of the Weld with Different Waveform Control Methods

Effect of Double Pulse MIG Welding on Porosity Formation on Aluminium 5083 Fillet Joint

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