• 제목/요약/키워드: FCAW

검색결과 155건 처리시간 0.025초

구조용강의 용접방법에 따른 부식피로특성 연구 (A Study on Corrosion Fatigue Characteristics Based on Welding Methods of Structural Steel)

  • 박경동;유형주
    • 한국기계가공학회지
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    • 제5권3호
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    • pp.58-64
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    • 2006

  • The security of stability for fractures of all sorts of parts and structure has become a first subject these days. We have need to organize fatigue characteristics of weldment because fatigue break out suddenly without a change of shape. In this study, we execute the fatigue test according to different of the welding method at the same materials. It was investigated about a fatigue limit according to welding methods of SMAW, FCAW and SAW at normal temperature and a frequency of 10Hz. The important results of the experimental study on fatigue characteristics of weldment are as follows: The fatigue limit of welding methods became low in the order of SMAW, FCAW, SAW.

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800MPa급 무예열 용접 판재의 수중 폭파변형시험 (Explosion Bulge Test Underwater of 800MPa Grade Pre-heat Free Welding Plate)

  • 박태원;송영범;김진영;양성호;박철규;서준석;김희진
    • Journal of Welding and Joining
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    • 제28권6호
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    • pp.63-69
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    • 2010

  • The pre-heat free consumables for GMAW, SAW and FCAW processes that matche with the Cu-bearing PFS-700 steel which has yield strength over 700MPa were developed and evaluated to see the suitability in military such as submarine and battle ship. Explosion Bulge Test underwater was developed and applied to see the reliability of welded structure. All welding was conducted without pre-heat before welding, the interpass temperature was below $150^{\circ}C$ for all welding conditions. Tensile strength for the weld metal in GMAW, SAW and FCAW process is 887MPa, 875MPa and 813MPa, respectively, these values are similar to the base metal of PFS-700 steel of 838MPa. EBT results in GMAW, SAW and FCAW show 14.0%, 14.02% and 15.9% reduction of thickness without generation of crack, respectively and stand-off distance was set up properly to have over 14.0% reduction of thickness. Through EBT results, the developed new consumables are applicable to the weapon systems such as submarine and battle ship.

  • https://doi.org/10.5781/KWJS.2010.28.6.063 인용 PDF KSCI

800MPa급 무예열 용접 판재의 수중 폭파변형시험 (Explosion Bulge Test in Underwater of 800MPa Grade Pre-Heat Free Welding Plate)

  • 박태원;송영범;김진영;양성호;홍성석;심인옥;박철규;김희진
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2010년도 춘계학술발표대회 초록집
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    • pp.63-63
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    • 2010

  • The pre-heat free consumables for GMAW, SAW and FCAW processes that matches the Cu-bearing PFS-700 steel which has yield strength over 700MPa were developed and evaluated to see the suitability in military such as submarine and battle ship. Explosion bulge test in underwater was developed and applied to see the reliability of welded structure. All welding was conducted without pre-heat before welding, the interpass temperature was below $150^{\circ}C$ for all welding conditions. Tensile strength for the weld metal in GMAW, SAW and FCAW process is 887MPa, 875MPa and 813MPa, respectively, these values are similar to the base metal of PFS-700 steel of 838MPa. EBT results in GMAW, SAW and FCAW show 14.0%, 14.02% and 15.9% reduction of thickness without generation of crack, respectively and stand-off distance was set up properly to have over 14.0% reduction of thickness. Through EBT results, the developed new consumables are applicable to the weapon systems such as submarine and battle ship.

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극후물재 용접부 내부잔류응력 측정기술 및 특성 (Characteristic and Measurement Technology of Inner Welding Residual Stresses in Thick Steel Structures)

  • 박정웅;안규백;우완측
    • Journal of Welding and Joining
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    • 제34권2호
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    • pp.16-21
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    • 2016

  • Recent keywords of the heavy industries are large-scale structure and productivity. Especially, the sizes of the commercial vessels and the offshore structures have been gradually increased to deliver goods and explore or produce oil and natural gas in the Arctic. High heat input welding processes such as electro gas welding (EGW) have been widely used for welding thick steel plates with flux-cored arc welding (FCAW), especially in the shipbuilding industries. Because high heat input welding may cause the detrimental effects on the fracture toughness of the welded joint and the heat affected zone, it is essential to obtain the sufficient toughness of welded joint. There are well known that the fracture toughness like CTOD, CVN, and KIC were very important factors in order to secure the safety of the structures. Furthermore, the welding residual stress should be considered to estimate the unstable fracture in both EGW and FCAW. However, there are no references on the welding residual stress distribution of EGW and FCAW with thick steel plates. Therefore the welding residual stresses were very important elements to evaluate the safety of the welded structure. Based on the measurement results, the characteristics of residual stress distribution through thickness were compared between one-pass electron gas welding and multi-pass flux-cored arc welding. The longitudinal residual stress in the multi-pass flux-cored arc welding is tensile through all thicknesses in the welding fusion zone. Meanwhile, longitudinal residual stress of EGW is tensile on both surfaces and compressive at the inside of the plate. The magnitude of residual stresses by electron gas welding is lower than that by flux-cored arc welding.

  • https://doi.org/10.5781/JWJ.2016.34.2.16 인용 PDF KSCI