• 제목/요약/키워드: Widmanctatten Ferrite Side Plate

검색결과 1건 처리시간 0.017초

일렉트로가스 용접부의 조직 및 인성에 관한 연구 (A Study on Microstructure and Thoughness of Electrogas Weldments)

  • 이해우;장태원;이윤수;석한길;강성원
    • Journal of Welding and Joining
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    • 제14권1호
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    • pp.68-74
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    • 1996
  • The microstructure of HAZ and the mechanical properties in weldments such as hardness and toughness were studied for mild steel and AH36 grade TMCP steel, as increasing heat input with electrogas welding process. The results of this study can be summarized as follow: 1) In the HAZ of mild steel, the width of coarse grained zone was larger than that of the nomalized zone, however in the case of TMCP steel, the nomalized zone was wider than the coarse grained zone. 2) The grain size of HAZ become coarse with increasing heat input. And at the same heat input, the grain size of TMCP steel was more coarser than that of mild steel. 3) According to the change of heat input, the deviation of hardness values was not significant, and the maximum values of hardness was not in HAZ but in the weld metal. And the hardness values in root part was higher than in face part. 4) Even though the HAZ grain size of mild steel was larger than that of TMCP steel, the impact values for mild steel was higher than those for TMCP steel, and the impact values in face part was higher than those in root part.

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