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용접열사이클 재현에 의한 SS400강 및 ST5304강의 특성 평가
안석환(SEOK-HWAN AHN),최문오(MOON-OH CHOI),김성광(SUNG-KWANG KIM),손창석(CHANG-SEOK SON),남기우(KI-WOO NAM) 한국해양공학회 2007 韓國海洋工學會誌 Vol.21 No.5
The welding methods have been applied in the most structural products from multi-field of automobile, ship construction and construction, and so on. The structure steel must have enough strength of structure. In this study, SS400 steel and STS304 steel were used to estimate the corrosion characteristics of the weld thermal cycle simulated HAZ. To evaluate the corrosion characteristics, also, the materials with two conditions were used in 3.5% NaCl. The one is to the drawing with diameter of Φ10 and the other is to the residual stress removal treatment. The electrochemical polarization test and immersion test were carried out. from test results, corrosion potential, corrosion current density, weight loss ratio and corrosion rate were measured. In the kinds of SS400 steels, corrosion potential of weld thermal cycle simulated specimens after the heat treatment showed somewhat the direction of noble potential. And in the base metal to be drawing weight loss ratio and corrosion rate occurred higher than the other kinds. In the kinds of STS304 steels, the result of base metal to be drawing was similar to results of SS400 steels, too. Two kinds of 750 ℃ and 1300 ℃ of weld thermal cycle simulation after the heat treatment were rather higher than the other kinds in weight loss ratio and corrosion rate.
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용접열사이클 재현에 의한 SS400강 및 STS304강의 특성 평가
안석환(SEOK-HWAN AHN),최문오(MOON-OH CHOI),정정환(JEONG-HWAN JEONG),김성광(SUNG-KWANG KIM),남기우(KI-WOO NAM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.6
The temperature distribution in the weldment is not uniform because a weldment is locally heated. Thermal plastic deformation results from the local expansion and shrinkage by the heating and cooling of metal. Therefore, residual stresses and distortion occur in tile weldment. In this study, we had conducted on the weld thermal cycle simulation that is supposed as the HAZ on SS400 steel and STS304 steel. The residual stresses that were obtained from the drawing and the weld thermal cycle simulation were estimated by X-ray diffraction. We also carried out ultrasonic test for tile weld thermal cycle simulated specimens, and then conducted on nondestructive evaluation by the ultrasonic parameters obtained ultrasonic test. From the results, residual stresses of weld thermal cycle simulated specimens after the residual stress removal heat treatment are lower than that of the drawing.
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