关键词: 桥梁工程, 焊接, 对流换热系数, 残余应力应变, X坡口平板对焊, 生死单元

Abstract: The impact of convective heat transfer coefficient on the residual stress and strain of butt welding was mainly investigated. Therefore, the reference for the cooling method of the existing important welding components (such as the bridge large tensile anchor plate) was given. The finite element simulation calculation of the welding parts was carried out by ABAQUS software, and the numerical value of convective heat transfer coefficient was changed to simulate the impact of cooling speed on residual stress and strain of thick plate welding. The research shows that: the calculation results of the welding zone with different cooling speed have no difference in magnitude, and it is also found that the influence of the convective heat transfer coefficient on the residual stress and strain of the component after welding is not monotonous linear relationship. In a moderate condition of convective heat transfer coefficient, the residual stress and strain of thick plate welding can reach the minimum.

Key words: bridge engineering, welding, convective heat transfer coefficient, residual stress and strain, X groove butt joint, birth- death element