波形焊接线连接的法兰节点承载力机理分析

Bearing Capacity Mechanism Analysis of Flange Joints Connected by Corrugated Welding Lines

波形焊接线连接的法兰节点以承载力高、受力性能优良等特点在工程中得到了逐步应用,为了对波形焊接线连接的法兰节点的承载力机理进行分析,首先采用理论计算方法,分析了焊缝有效长度对节点承载力的影响规律,并与环形焊缝的平焊带颈法兰节点进行了对比;其次,采用有限元手段进行参数化建模,找出节点的最优波形并对其承载力进行了计算;最后,对4个波形焊接线连接的法兰节点和4个平焊带颈法兰节点进行了轴压和轴拉试验研究,并讨论了轴拉试验中焊接热对节点承载力折减的影响。研究结果表明:相较于平焊带颈法兰节点,波形焊接线连接的法兰节点通过增加焊缝的有效长度能够使节点的承载力提高;波形焊接线能够将焊缝缺陷以及焊接热影响区从同一断面错开,减小局部应力集中,从而提高承载力。

The flange joint connected by corrugated welding lines has been gradually applied in engineering because of its high bearing capacity and excellent mechanical properties.In order to analyze the bearing capacity mechanism of the flange joint connected by corrugated welding lines,firstly,thd paper analyzed the influence law of the effective length of weld on the bearing capacity of the joint by using the method of theoretical calculation,and a comparison analysis was conducted with the flat welded flange joint with neck.Then,the parametric modeling was carried out by means of finite element to find out the optimal waveform of the joint and calculate its bearing capacity.Finally,the axial compression and axial tension tests of four flange joints connected by corrugated welding lines and four flat welded flange joints with necks were carried out,and the influence of welding heat on the reduction of bearing capacity of joints in axial tension test was discussed.The results showed that the bearing capacity of the flange joint connected by corrugated welding lines could be improved by increasing the effective length of the weld compared with the flat welded flange joint with neck;corrugated welding lines could stagger weld defects and welding heat affected zone from the same section,reduce local stress concentration,so as to improve bearing capacity.