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Vol.47, No.3, 195 ~ 202, 2009
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| Title |
| Effects of Mn and Heat-input on the Mechanical Properties of EGW Welds |
| 강성원 Sung Won Kang , 김명현 Myung Hyun Kim , 이정수 Jeong Soo Lee , 김남인 Nam In Kim , 정상훈 Sang Hoon Jeong |
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| Abstract |
| This paper is concerned with effects of Mn and heat-input on the mechanical properties of EGW welds. Four different kinds of welding consumables were fabricated by varying Mn contents such as 1.3, 1.5, 1.7, 2.0%Mn and each consumable was welded for EGW on four heat-input conditions between 190 and 340 KJ/Cm. Mn contents were decreased as heat-input increases and alloy elements (C, Si, Ti, B, Al) to deoxidize easily also revealed similar tendency to Mn. Their microstructure, Charpy impact property and strength were investigated, and it is found that Charpy impact property and strength exhibit a strong dependence on change of microstructure by Mn contents and heat-input. The increase of Mn contents or the decrease of heat-input made the microstructure fine and increase volume fraction of acicular ferrite, thereby leading to the great improvement of Charpy impact property and strength. In case of single EGW, optimum Mn contents are over 1.7% for the toughness and strength. |
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| Key Words |
| electro gas welding, flux cored wire, toughness, strength, manganese, heat input |
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