波形角焊缝对波形带颈法兰节点的热影响

Heat effect of wave-shaped fillet welding on wave-shaped hubbed flange joints

波形带颈法兰节点可克服常规环形焊接法兰节点中焊缝集中于同一截面,而使构件存在危险断面的不利情况。针对目前对波形带颈法兰节点的研究尚显不足的情况,为避免焊接缺陷在环形断面集中,提出了波形带颈法兰节点的形式,通过有限元数值模拟进行分析,对焊接温度变化过程进行描述,同时对焊接残余应力的影响区域进行量化分析,并获得节点极限承载力。计算结果表明,波形焊缝可错开焊接缺陷集中环形分布,同时加强了钢管与法兰的连接,并极大地改善了焊接热对法兰节点受力性能的影响。

Wave-shaped hubbed flange joints can overcome the unfavorable situation of the dangerous section for component due to welding concentrated in one cross section of common annular welding flange joint. In view of the present research on the wave-shaped flange joint is insufficient condition,the wave-shaped hubbed flange joint form was proposed in order to avoid concentrated welding defects in the annular cross section. The analysis of finite element numerical simulation was conducted to describe the temperature change in welding process,and quantitatively analyze the influence region of welding residual stress to obtain the ultimate bearing capacity of joints. The calculation results show that the wave-shaped welding can avoid the concentric annular distribution of welding defects,and can strengthen the connection between steel pipe and flange,and can greatly improve the influence of welding heat on the performance of flange joints.