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        Corrosion and Creep Properties of Weld Beads Produced on AA5083-H111 Alloy Sheets Using SpinArc GMAW Process

        V. Poonguzhali,M. Umar,P. Sathiya 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.1

        In this work, the corrosion and creep properties of weld beads produced on AA5083-H111 alloy using SpinArc gas metalarc welding process were analyzed. For that, bead on plate welding was carried out considering welding current, filler spindiameter and filler rotation speed as input parameters. It is evident from the microstructures that change in filler spin diameterand filler rotation speed altered the shape of weld bead irrespective of welding current. Also, porosities were formed atboth side walls where the columnar dendrites grow upward while the equiaxed dendrites zone contains comparatively fewerporosities. On comparing the left and a right side wall, a higher density of porosities are observed at the right side wall andthe direction of rotation was expected to be responsible for this occurrence. The pitting morphology of both side walls wasnot similar due to the variance in concentration of Mg and a higher amount of Mg exists on the right side wall led to theprecipitation of Mg-rich rich particles result in severe corrosion. A welding current of 130 Amps, the filler rotation speed of1050 rpm and filler spin diameter of 2 mm produced a high density of dislocations and a higher number of Fe and Mn-richintermetallics at grain interiors as well as grain boundaries, thereby, results in improved corrosion and creep properties ofweld. The weld contains larger porosities results in poor corrosion and creep properties.

      • <i>Duganella</i> <i>sacchari</i> sp. nov. and <i>Duganella</i> <i>radicis</i> sp. nov., two novel species isolated from rhizosphere of field-grown sugar cane

        Madhaiyan, M.,Poonguzhali, S.,Saravanan, V. S.,Hari, K.,Lee, K.-C.,Lee, J.-S. International Union of Microbiological Societies 2013 International journal of systematic and evolutiona Vol.63 No.3

        <P>Two strains, designated Sac-22<SUP>T</SUP> and Sac-41<SUP>T</SUP>, were isolated from rhizosphere soil and rhizoplane of field-grown sugar cane clone Co86032. Comparative 16S rRNA gene sequence analysis showed a clear affiliation of these two bacteria with the class <I>Betaproteobacteria</I>, their closest relatives being <I>Pseudoduganella violaceinigra</I> and <I>Duganella zoogloeoides</I> with 16S rRNA gene sequence pairwise similarities of 96.4–97.2 % to the two novel strains. Strains Sac-22<SUP>T</SUP> and Sac-41<SUP>T</SUP> shared a 16S rRNA gene sequence similarity value of 97.6 %. Cells of the two strains were Gram-reaction-negative, aerobic, motile and rod-shaped. Ubiquinone (Q-8) was the respiratory quinone and the predominant polar lipids consisted of phosphatidylglycerol and phosphatidylethanolamine. The main cellular fatty acids were C<SUB>16 : 0</SUB>, C<SUB>16 : 1</SUB>ω7<I>c</I>/iso-C<SUB>15 : 0</SUB> 2-OH, C<SUB>17 : 0</SUB> cyclo, C<SUB>10 : 0</SUB> 3-OH and C<SUB>12 : 0</SUB>. The DNA G<I>+</I>C content of the genomic DNA was 56.4 mol% for strain Sac-22<SUP>T</SUP> and 54.9 mol% for strain Sac-41<SUP>T</SUP>. Based on the results of 16S rRNA gene sequence analysis and physiological and biochemical characterization, that differentiated strains Sac-22<SUP>T</SUP> and Sac-41<SUP>T</SUP> from all recognized species of the genus <I>Duganella</I>, it was concluded that strains represent two novel species in the genus <I>Duganella</I> for which the names <I>Duganella</I> <I>sacchari</I> sp. nov. (type strain Sac-22<SUP>T</SUP> = KCTC 22381<SUP>T</SUP> = NCIMB 14475<SUP>T</SUP>) and <I>Duganella</I> <I>radicis</I> sp. nov. (type strain Sac-41<SUP>T</SUP> = KCTC 22382<SUP>T</SUP> = NCIMB 14476<SUP>T</SUP>) are proposed.</P>

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