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http://dx.doi.org/10.5781/KWJS.2011.29.1.074

Variation of Toughness and Porosity Formation in Weld Metal with Al Content in Self-Shielded Arc Welding Wire  

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.)
Publication Information
Journal of Welding and Joining / v.29, no.1, 2011 , pp. 74-79 More about this Journal
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.
Keywords
Self-shield arc welding wire; Al content; Weld metal microstructure; Toughness; porosity;
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