Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Variation of Toughness and Porosity Formation in Weld Metal with Al Content in Self-Shielded Arc Welding Wire

셀프실드용접 와이어의 Al 첨가량에 따른 용접금속 인성 및 기공형성 변화

  • Bang, Kook-Soo (Div. of Adv. Mat. Sci. & Eng., Pukyong National University) ;
  • Park, Chan (Div. of Adv. Mat. Sci. & Eng., Pukyong National University) ;
  • Woong, Kil (Welding Research Institute, ESAB SeAH Corp.) ;
  • Chang, Woong-Seong (Research Institute of Industrial Science and Technology.)
  • 방국수 (부경대학교 신소재공학부) ;
  • 박찬 (부경대학교 신소재공학부) ;
  • 길웅 ((주)세아ESAB 용접기술연구소) ;
  • 장웅성 (포항산업과학기술연구원 용접센타)
  • Received : 2010.06.25
  • Accepted : 2010.10.27
  • Published : 2011.02.28
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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 $\delta$-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 $\delta$-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.

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References

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