고망간강/스테인레스강 맞대기 용접시 물리적 성질이 잔류응력에 미치는 영향

Abstract

Corrosion deterioration or cyclic loading of steel structure results in fatigue, buckling and fatigue. Double corrosion and deterioration damage of RC deck are generated mostly. In Japan, 1691 highway bridges and 390 bridges were demolished and repaired / reinforced during the ten years from 1977 to 1986. The reasons for this are classified into six categories: damage and lack of load bearing capacity, seismic countermeasures, functional problems, improved construction, and other factors. In addition, it can be seen that the damage of the bottom plate and the corrosion of the steel are 51%, which is the cause of the specific gravity. As a method to reduce damage caused by corrosion of steel and to prolong the life of steel structure, it is possible to minimize corrosion damage by using steel which is not easily corroded in bridges. The recently developed high manganese steel is resistant to corrosion, has high strength properties, and has excellent formability and is used in many industrial fields. Instead of using high manganese steel, the entire bridge can be combined with other steel materials for light weight and cost reduction, and it is possible to design an economical and efficient system by using it locally where corrosion is severe. However, the mechanical behavior of the welded joint between the high manganese steel and other members of the material has not yet been clarified, and the effect of residual stress on the fatigue strength and fracture strength has not yet been clarified to be. Therefore, it is very important to evaluate accurately the effect of welding residual stress on dissimilar material of steel structure during welding. In this paper, residual stress analysis is performed by using finite element method and the surface residual stress is measured and compared in order to characterize the residual stress caused by dissimilar material welding of high Mn and stainless steels. Parametric analysis of the change of the residual stress due to the change of main properties was performed by considering the result. As a result, the main factors affecting the welded joint were identified. In addition, tensile loads were applied to different welds to determine the mechanical behavior.