CAJ | 학술논문

结合焊接性理论分析，对500 MPa级高性能桥梁钢板开展了焊接热影响区最高硬度、斜Y坡口焊接裂纹和对接接头系列温度冲击试验研究。试验结果表明，试验钢的碳当量CEV为0.44%，Pcm为18%，在室温下焊接热影响区最高硬度为274 HV10，淬硬倾向小；采用焊条电弧焊和气体保护焊时，板厚≤32 mm时不需要预热；板厚＞32～60 mm时需要预热80℃；焊接热影响区的ETT50达到-60℃，具有良好的低温冲击韧性。试验钢板焊接性良好，可应用于高性能桥梁的建设。
결합한접성이론분석，대500 MPa급고성능교량강판개전료한접열영향구최고경도、사Y파구한접렬문화대접접두계렬온도충격시험연구。시험결과표명，시험강적탄당량CEV위0.44%，Pcm위18%，재실온하한접열영향구최고경도위274 HV10，쉬경경향소；채용한조전호한화기체보호한시，판후≤32 mm시불수요예열；판후＞32～60 mm시수요예열80℃；한접열영향구적ETT50체도-60℃，구유량호적저온충격인성。시험강판한접성량호，가응용우고성능교량적건설。
Based on the weldability theoretical analyzing,the maximum hardness of welding heat-affected zone (HAZ),small Y type cracking and butt welded joint series temperature impact of 500 MPa high performance steel were tested. The results showed, when the carbon equivalent CEV and Pcm of test steel are 0.44 and 0.18 percent, the maximum hardness of HAZ under room temperature is 274 HV10, when the thickness of steel plate is less than or equal to 32 mm, no preheating process is needed, else when more than 32 mm but less than 60 mm, the preheating process is necessary and preheating temperature is 80 ℃. The ductility brittleness transition temperature ETT50 of HAZ achieve at-60 ℃,which shows the toughness is very well. By mentioned above, that weldability of test steel plate perform well,the test steel can be used in construction of high performance bridges.