Journal of Welding and Joining

  • 제31권5호
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  • Pages.47-53
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  • 2013
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
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열간압연 클래드강의 맞대기용접부 내식성 및 용접성 평가

Evaluation of Corrosion Resistance and Weldability for the Butt Welding Zone of Hot Rolled Clad Steel Plates

  • 박재원 (NID 융합기술대학원 나노.IT 융합프로그램) ;
  • 이철구 (서울과학기술대학교 기계.자동차공학과)
  • Park, Jae-Won (School of Nano IT Fusion Program, Graduate School of NID Fusion Technology, Seoul National University of Science and Technology) ;
  • Lee, Chul-Ku (Dept. of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • 투고 : 2013.08.22
  • 심사 : 2013.10.24
  • 발행 : 2013.10.31
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초록

We have investigated the traits of clad metals in hot-rolled clad steel plates, including the sensitization and mechanical properties of STS 316 steel plate and carbon steel (A516), under various specific circumstances regarding post heat treatment, multilayered welds, and thick or repeated welds for repair. For evaluations, sectioned weldments and external surfaces were investigated to reveal the degree of sensitization by micro vickers hardness, tensile, and etching tests the results were compared with those of EPR tests. The clad steel plates were butt-welded using FCAW and SAW with the time of heat treatment as the variable, a that was conducted at $625^{\circ}C$, for 80, 160, 320, 640, and 1280 min. Then, the change in corrosion resistance was evaluated in these specimens. With carbon steel (A516), as the heat treatment time increased, the annealing effect caused the tensile strength to decrease. The micro-hardness gradually increased and decreased after 640 min. The elongation and contraction of the area also increased gradually. The oxalic acid etch test and EPR test on STS316 and the clad metal showed STEP structure and no sensitization. From the test results on multi-layered and repair welds, it could be concluded that there is no effect on the corrosion resistance of clad metals. The purpose of this study was to suggest some considerations for developing on-site techniques to evaluate the sensitization of stainless steels.

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참고문헌

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