Special features of double pulsed gas metal arc welding

Wang, Leilei; Wei, Huiliang; Xue, Jiaxiang; DebRoy, T.

doi:10.1016/j.jmatprotec.2017.08.039

Cited by 49 publications

(24 citation statements)

References 20 publications

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“…An obvious inter-crystalline "burr-like" boundary can be seen in the figure. Synthesized with the conclusion from Figure 4, we found that the boundary was at the "handover" position of two adjacent low-frequency cycles [20]. Figure 7 shows the metallographic structure of specimens 2-1# and 3-1# parallel to the direction of the weld.…”

Section: Molten Pool Oscillation Analysismentioning

confidence: 58%

Effect of Double-Pulse Characteristics on Weld Bead Formation and Mechanical Properties in Metal Inert Gas Welding

Liu

Xue

2021

Metals

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Aluminum alloy has been widely used due to its excellent workability, and double-pulse metal inert gas welding (MIG) has become a popular technique in aluminum alloy welding. In this study, a cross-complementary test was performed to study the effect of double-pulse characteristics on weld bead formation and mechanical properties in MIG welding. The test was carried out on an AA6061 aluminum alloy using flat overlaying welding. After welding, the micro-metallographic structure and macro-mechanical performance of the weld bead were explored. The test results showed that the two methods of increasing the base current amplitude or the low-frequency of the current effectively enhanced the oscillation of the molten pool, refined the grain size of the fusion zone, and improved the mechanical properties of the weld. Additionally, by comparing the macroscopic photograph of the specimen and the corresponding welding parameters in the test, the formation characteristics of the bead’s fish-scale pattern in double-pulse MIG welding were found when appropriate welding parameters were adopted and weld bead formation was good. This test result provides a strong scientific basis for the selection of welding parameters in the actual promotion and application of double-pulse MIG welding.

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Section: Molten Pool Oscillation Analysismentioning

confidence: 58%

Effect of Double-Pulse Characteristics on Weld Bead Formation and Mechanical Properties in Metal Inert Gas Welding

Liu

Xue

2021

Metals

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“…The beneficial effect of an increase in the thermal amplitude is a decrease in grain dimension. It is possible to achieve grain refinement of fusion zone by increasing the thermal amplitude in a large section, assuming that the welding process stability is not considered [37]. concept that variations of the microstructure can be achieved by changing the pulsing parameters instead of changing the heat input.…”

Section: Solidification Structurementioning

confidence: 99%

Perspective on Double Pulsed Gas Metal Arc Welding

Wang

Xue

2017

Applied Sciences

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Aluminum alloy welding suffers from problems such as solidification cracking and hydrogen-induced porosity, which are sufficiently severe to limit its potential applications. Because mitigated porosity incidence and solidification cracking are observed in aluminum welds using double pulsed gas metal arc welding (DP-GMAW), a comprehensive review of the mechanism is necessary, but absent from the literature. The oscillation of arc force and droplet pressure causes a weld pool stir effect. The expansion and shrinkage of the weld pool cause unusual remelting and resolidification of the previously solidified metal. DP-GMAW has an increased solidification growth rate and cooling rate, compared with conventional pulsed welding at same heat input. Both numerical and experimental results reveal the remarkable concept that refined microstructure in the fusion zone is obtained by using DP-GMAW. The mechanism of microstructural refinement is revealed as a weld pool stir effect and increased cooling rate. Hydrogen bubbles easily float out and then release from the weld pool originated from the weld pool stir effect. Reduced solidification cracking is achieved due to the refined solidification structure that originated from the increased cooling rate. The advantages, evolution process, and future trend of DP-GMAW are discussed.

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“…Double pulse gas metal arc welding (DP-GMAW) is an efficient and novel welding technology developed on the basis of conventional pulse gas metal arc welding (P-GMAW) for the aluminum alloy [ 1 , 2 ]. DP-GMAW is extensively used in automobile, vessel, high-speed railway, aircraft and other industrial fields due to its special advantages, such as a beautiful weld surface, low porosity, fine grain structure and little crack incidence [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Difference in the Pulse Current in the Double Pulsed Gas Metal Arc Welding of Aluminum Alloys

et al. 2022

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In this paper, a double pulse gas metal arc welding (DP-GMAW) for an AA6061-T6 aluminum alloy based on fewer basic welding parameters than the traditional DP-GMAW is proposed. This study compared the difference in pulse base currents (ΔIb) and the difference in the pulse peak currents (ΔIp) by analyzing the electrical signal and morphology properties of welded samples. The results indicated that changing ΔIp caused welding defects or even welding failure easily. The welding stability after changing ΔIb was much better than that after changing ΔIp. The individual fish-scale width of the weld joint remained unchanged when ΔIb was at different values. In addition, the average absorbed work, tensile strength, yield strength and elongation of the weld joints obtained by different ΔIb values reached 31.1%, 60.2%, 52.9% and 37.9% of the base metal, respectively.

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Special features of double pulsed gas metal arc welding

Cited by 49 publications

References 20 publications

Effect of Double-Pulse Characteristics on Weld Bead Formation and Mechanical Properties in Metal Inert Gas Welding

Effect of Double-Pulse Characteristics on Weld Bead Formation and Mechanical Properties in Metal Inert Gas Welding

Perspective on Double Pulsed Gas Metal Arc Welding

Investigation of the Difference in the Pulse Current in the Double Pulsed Gas Metal Arc Welding of Aluminum Alloys

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