某超大真空容器新型大门法兰焊接方案模拟与分析  

Simulation of Gate Flange Welding for Oversized Vacuum Chamber

作　　者：吕世增[1] 祁妍[1] 

机构地区：[1]北京卫星环境工程研究所,北京100094

出　　处：《真空科学与技术学报》2015年第2期137-141,共5页Chinese Journal of Vacuum Science and Technology

基　　金：中国空间技术研究院总装与环境工程部自主研发项目基金

摘　　要：大门法兰是某直径17m超大真空容器的关键部件,其刚度特性直接影响到真空容器的密封效果及稳定性。针对超大真空容器传统形式法兰加工制造困难、消耗材料较多、结构刚度较差等问题,提出了一种新型的法兰结构形式。而新型法兰的焊接工艺将对其结构强度有较大影响,通过有限元模拟了大门法兰的两种焊接方案,并对焊后的应力及变形进行了分析,从而优选出焊接方案Ⅱ。采用焊接方案Ⅱ,焊后的最大变形量为18.3mm,两条焊缝的最大残余应力分别为210和270MPa。A novel type of gate flange structure,a critical part of the oversized vacuum chamber（17m in diameter）was developed.The welding of the hollow-structured new gate flange was mathematically modeled,theoretically analyzed on the basis of thermal elastic-plasticity,and numerically simulated in finite element method with software MSC.Marc.The upper and lower seams denote the circular joints between the flange and the upper and lower capped ends.The impact of the welding sequence of the two seams on the distributions of deformation and residual stress around the welded-joints was investigated.The simulated results show that the welding sequence strongly affected the deformation and residual stress.For example,the welding sequence,lower-seam first and upper-seam second,resulted in a maximum radial deformation of 18.3mm,and the strongest residual stresses of 210 and 270 MPa at the two joints,respectively.

关 键 词：真空容器 法兰 焊接方案 模拟与分析 

分 类 号：TH-9[机械工程]