발간논문

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Vol.19, No.8, 651 ~ 661, 1981
Title
Effects of Welding Consumables on the Fracture Toughness of Weld metal
이종봉Jong Bong Lee, 김영식Young Sik Kim
Abstract
Effects of sub-grain size, dislocation density and inclusions on fracture toughness of structural steel weld metals were investigated by the Electron Microscopy. Impact properties of weld metals welded by MMA with three different welding consumables were evaluated by the Charpy and COD test. Results can be summarized as follows: 1) Impact toughness in the weld metal was extraordinarily varied by welding consumables. 2) For the purpose of getting superior impact properties, the balance between dislocation density and subgrain size should be accomplished, and formation of upper bainite should also be controlled. (Received June 22, 1981)
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