철근 가스압접의 접합조건에 대한 연구 = A Study on the Weld Condition of Gas Pressure Welding in Steel Bars

다국어 초록 (Multilingual Abstract)

Recently, it has increased that the importance of gas pressure weldment of steel bars in large construction bars. But there has hardly been any studies about it. Therefore we need more research. SD40 steel bar (32mm in diameter) which has been practically used at construction sites are tested about tension, bending, fatigue, a macro structure and micro structure at longitudinal section and hardness to find out the mechanical property and best welding ranges in some cases of mechanical cut and gas cut before gas pressure welded.
It is that a gas-pressure welded zone of steel bar where was cleaned of impurities in way of two-upsetted method is more excellent bending and tension property than the regulation of KS D 0244. Also gas cut bars gained hardness from the heat affected zone so. In conclusion, to improve the weldability of steel bars, it is considered best to clean mechanically cut surfaces and then weld them by a method of 2 step upset way.

목차 (Table of Contents)

• 1. 서 론
• 2.실험장치 및 방법
• 2.1실험장치
• 2.2 실험방법
• 2.2.1 시험편 제작
• 2.2.3 인장시험
• 2.2.4 굽힘시험
• 2.2.5 피로시험
• 2.2.6 조직검사
• 2.2.7 경도시험
• 3.실험결과 및 고찰
• 3.1인장시험
• 3.2 굽힘시험 결과
• 3.3 피로시험
• 3.4 조직검사
• 3.5 경도시험
• 4. 결 론