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- W3014389145 abstract "In contrast to other welding processes of aluminum alloys, variable polarity plasma arc (VPPA) nonvertical-up welding produces pores in specific positions (on the upper side of the welded joint) rather than throughout the whole welded joint due to the effect of gravity. In horizontal welding, the porosity area percentage on the upper side of the welded joint reached about ∼20%. Asymmetric metal flow in the keyhole molten pool caused either side of the weld to have different cooling rates. This difference in cooling caused the metal on this side of the weld to rapid crystallization, leading to higher concentrations of copper and manganese around the weld that are conducive to higher porosity. The Cu content reached ∼50% around the pores but was only ∼7% in the filler wire and ∼5% in the base metal. The root reason for porosity is the asymmetric metal flow. To correct this, the free point was found according to the force balance on the leading side of the keyhole. A proposed method to produce symmetric metal flow was used, and the resulting welds were determined to be of high quality via X-ray phase-contrast imaging." @default.
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- W3014389145 date "2020-08-01" @default.
- W3014389145 modified "2023-09-27" @default.
- W3014389145 title "Control of gravity effects on weld porosity distribution during variable polarity plasma arc welding of aluminum alloys" @default.
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- W3014389145 doi "https://doi.org/10.1016/j.jmatprotec.2020.116693" @default.
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