• Title/Summary/Keyword: 용접후열철

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A Electrochemical Study on the Effect of Post-Weld Heat Treatment about Corrosion Resistance Property of SS400 Steel for Ship's Materials (선박재료용 SS400강의 내식성에 대한 용접후열처리효과에 관한 전기화학적 연구(I))

  • 김진경
    • Journal of Advanced Marine Engineering and Technology
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    • v.23 no.6
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    • pp.806-813
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    • 1999
  • The effect of Post-Weld Heat Treatment(PWHT) of SS400 Steel was investigated with parameters such as micro vickers hardness corrosion potential polarization behaviors galvanic current Al anode generating current Al anode weight loss etc. Hardness of each parts(HAZ, BM, WM)by PWHT is lower than that of each parts by Non Post-Weld Heat Treatment(NPWHT) However hardness of WM of HAZ part was the highest among those three parts and HAZ area were also acted as cathode without any case of heat treatment. Potential difference between each three parts by PWHT was also smaller compared to NPWHT. Therefore it is suggested that Corrosion resistance property is increased by PWHT. However both Al anode generating current and anode weight loss was also decreased by PWHT compared to NPWHT when SS400 steel is cathodically protected by Al anode.

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Fatigue Life Analysis of Butt-welded Joint with and without Postweld Heat Treatment by Local Strain Approach (국부변형률 방법을 이용한 용접후열처리 전후 시편의 피로수명 해석)

  • Lee, Dong-Hyoung;Seo, Jeong-Won;Goo, Byeong-Choon;Seok, Chang-Sung
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1086-1091
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    • 2003
  • The problem of residual stresses and fatigue behavior in welded structures is the main concern of welding research fields. The residual stresses and distortions of structures by welding exert negative effect on the safety of mechanical structures. Postweld heat treatment is usually carried out to relieve this residual stresses of welded joints. In this paper the influence of postweld heat treatment on fatigue life of butt-welded joint was investigated. To predict the effect of PWHT, an analytical model is developed by finite element and local strain approach and the result of fatigue life analysis is compared to experimental results. It is demonstrated that fatigue life estimates closely approximate the experimental results and PWHT provides some increase of fatigue lives in long-life fatigue region and no increase in short-life fatigue region because of the residual stress relaxation under tensile loads.

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