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J Weld Join > Volume 30(2); 2012 > Article
Journal of KWJS 2012;30(2):70-75.
DOI: https://doi.org/10.5781/KWJS.2012.30.2.70    Published online May 16, 2012.
Effect of Nitrogen Volume in Ar-N2 Shielding Gas on Microstructure and Hardness of GTA Welded Pure Ti
Hyun-Jun An, Ae-Jeong Jeon, Jae-Keun Hong, Bo-Young Jeong, Jong-Sub Lee, Chung-Yun Kang
Abstract
  In this study, effect of nitrogen volume in the shielding gas of Ar-N₂ mixing gas on the bead shape, hardness and microstructure of GTA welds of 3mm thick Commercial Pure Ti was investigated. As the nitrogen volume increased, the welding current for full penetration was reduced and hardness in the fusion zone significantly increased compared with that of the base metal, but there is no difference in the hardness of HAZ. Microstructure in the fusion zone with pure Ar gas changed from equiaxed alpha of the base metal to serrated alpha. On the other hand, microstructure using Ar-N₂ mixing gas changed to acicular alpha. With the increasing of nitrogen content, the amount of acicular alpha increased and the size of that was fine.
Key Words: CP Ti, GTAW, Shielding gas, Ar-N₂ mixing gas, Microstructure, Hardness


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