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Journal of KWJS 2010;28(2):79-83.
Published online May 13, 2010.
The Study about Characteristics of Welding Consumable and Weld Metal for EGW
Jeong-Soo Lee, Jin-Oh Yun, Sang-Hoon Jeong, Chul-Gyu Park, Young-Ho An
Abstract
  In this study, newly developed welding consumables for EGW were welded in EH 36 TM steel plates and their welded joints were evaluated in point of mechanical properties and microstructures compared with imported consumables. Newly developed welding consumables were evaluated as good arc stability and slag fluidity, substantially the same with imported products. The tensile strength of all welded joints were sufficient to meet the requirements specified in a ship’s classification(490~640㎫) and all areas of fracture were heat affected zone(HAZ). Charpy absorbed energy values of all EG welded metals were sufficient to meet the requirements of classification(min. 34J) and those of newly developed wires were evaluated to be better than those of imported wires. As a result observing microstructures of single and tandem EG welded metals through optical and scanning electron microscope (OM&SEM), no grain boundary ferrite(PF(G)) were created in a prior austenite grain boundary and a volume fraction of a fine acicular ferrite were observed very high.
Key Words: Welding consumable for EGW, Large hea input, Toughness


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