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JWJ > Volume 29(1); 2011 > Article
Journal of KWJS 2011 February;29(1) :74-79.
Published online March 4, 2011.
Variation of Toughness and Porosity Formation in Weld Metal with Al Content in Self-Shielded Arc Welding Wire
Kook-soo Bang, Chan Park, Kil Woong, Woong-Seong Chang



Correspondence:   Published online March 4, 2011
ABSTRACT
  Three different welding wires were used to study the effects of Al content on weld metal toughness and porosity formation in self-shielded arc welding. Weld metal microstructure showed that while wire with 1.3% Al content contains coarse δ-ferrite, wires with less than 0.5% Al content showed no such phase. In addition to the microstructural differences, cleanliness in weld metal was also different among wires. It showed that weld metal toughness was influenced by the δ-ferrite formation, cleanliness and Ni addition. Even though wires with less than 0.5% Al content showed higher weld metal toughness, they showed relatively poor workability, forming porosities in weld bead in lower arc voltages.
Keywords: Self-shield arc welding wire;Al content;Weld metal microstructure;Toughness;porosity
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