구조용 압연강재와 스테인리스강재의 CO2 용접에 대한 기계적 특성연구
A study on the mechanical properties of structure rolled steel and stainless steel for the CO2 welding
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초록
산업시설에는 용접된 구조물에 반복 하중이 발생하여 피로파괴가 발생하고 있는데 이 피로파괴를 줄이기 위해일반구조용압연강재(SS400)와 스테인리스강(STS304)을 CO2 용접하여 기계적 특성 분석을 하였다. X-ray 촬영을 하여 결함검사를 하고 용접부에 결함이 없는 시험편으로 경도, 인장, 피로 시험을 하였다. 경도는 SS400과 STS304가 용접된 시험편이 SS304만 용접된 시험편보다 높게 나타났다. 그리고 인장강도와 항복강도는 반대로 SS304만 용접된 시험편이 높았으며피로한도 또한 마찬가지였다. 따라서 CO2 용접을 할 경우 융점이 낮고 용접성이 좋은 SS400만으로 용접할 때 더 좋은 성능을 보여준다.
Abstract
It is well known that fatigue failure occur on welded structures in industrial application due to the repetitive load force. In order to decrease the fatigue failure, we analysed the mechanical properties based on their structural aspect,roll steel (SS 400) welded onto stainless steels (STS 304) by CO2 gas as well as structure roll steel welded onto itself. We compared the hardness, tensile and fatigue properties with two kinds of samples which had no defects on the welding part observed by X-ray topographic analysis. It was recognized that the tensile and fatigue strength of SS 400 welded onto itself by CO2 gas was higher than that of SS 400 welded onto STS 304.
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