构架管板搭接接头数值模拟与校核

Welding numerical simulation and verification of lap joint from metro framework

管板搭接接头是B型地铁构架的横梁上吊座与横梁管的重要焊缝之一,为多层多道焊。焊接收缩量大,且容易造成应力集中。吊座与横梁管的焊接质量直接影响构架的整体性能,因此,有必要对管板搭接接头应力分布展开研究。本文利用Sysweld焊接软件,采用热源曲线作为加热热源,通过试验温度循环曲线与模拟温度循环曲线匹配原则,进行管板搭接接头数值分析模型的建立和热源校核。通过建立的数值分析模型得到接头的应力分布,对关键点采用X射线衍射仪展开测试,并与模拟点应力分布进行对比,证明建立的管板搭接接头的数值分析模型能够准确反映应力分布趋势。

Lap joint is one of the most important? weld part of metro framework, which locateed in the connection of generator hanger support and main cross beams. It is a typical multi pass welded structure, welding shrinkage is large and which easily led to stress concentration. The welding quality of the connection of generator hanger support and main cross beams affects the performance of framework directly, so it is necessary to carry out the research of lap joint stress distribution. In this paper, welding simulation software Sysweld was used and a heat curve was taken as the heating source. Through the matching principle of simulation of temperature cycling curve with experimental temperature cycling curve, a numerical simulation model of lap joint was built and checked. Through the numerical simulation, the stress distribution of the lap joint was obtained, then key positions stress distribution of the joint was test by X-ray diffractometry. it was verified that the numerical model of lap joint could reflect the stress distribution trend accurately by comparing the stress distribution of test and simulation.