本文選題：SYSWELD + 雙橢球熱源　； 參考：《新疆大學》2015年碩士論文

【摘要】：在現(xiàn)代工業(yè)生產中焊接技術被廣泛應用,焊接過程中伴隨著局部高溫及不均勻受熱,使焊接件在熔化和固態(tài)區(qū)域中產生殘余應力及變形,嚴重影響其焊接質量和使用性能,因此掌握焊接中焊縫區(qū)域溫度場的變化、焊接過程中殘余應力的分布及應力引起的變形規(guī)律,在實際焊接質量尤為重要。本文采用有限元分析方法,基于SYSWELD軟件平臺,選取雙橢球體熱源模型,對焊接中溫度場及應力應變場分布進行模擬仿真。首先對暖氣管道運輸中T形管焊接過程進行數(shù)值模擬,并結合現(xiàn)有實驗設備,利用紅外熱成像儀對焊接過程中溫度場分布進行實時檢測,對檢測結果進行數(shù)據(jù)處理,與分析結果進行對比驗證;結合驗證數(shù)據(jù),對焊接過程進行優(yōu)化處理,達到與實驗相匹配的分析結果,使模擬分析過程在實際焊接中具有指導意義。在以上分析基礎之上,對管道運輸中彎管法蘭焊接模擬仿真,得出焊接過程中最高溫度在1630℃左右,與實驗驗證溫度場分布相符;在300s時刻最大應力max??369.46MPa,在其抗拉強度490~675MPa范圍之內;最大應變?yōu)閙ax??0.32mm,但在彎管處出現(xiàn)整體偏移,偏移量為0.29mm,對其后續(xù)安裝過程及焊接后工件的垂直度產生影響;因此,對裝卡條件進行優(yōu)化,在彎管處施加裝卡條件阻止剛性體運動。重新對整體進行分析,得到整體最大應變max??0.29mm,在彎管端面處應變降到0.1mm左右,保證了彎管處尺寸要求,保障了后續(xù)安裝的尺寸精度。此分析方法,有效地反應焊接過程中溫度及應力應變場分布情況,可通過改變焊接路徑和優(yōu)化工藝參數(shù)等保證焊接質量,大大縮短了焊接實驗周期、節(jié)約了實驗成本,對管道安裝中焊接過程起到指導意義。
[Abstract]:Welding technology is widely used in modern industrial production, and the welding process is accompanied by local high temperature and uneven heating, which results in residual stress and deformation in melting and solid region, which seriously affects the welding quality and performance. Therefore, it is very important to master the variation of temperature field in weld zone, the distribution of residual stress in welding process and the deformation law caused by stress, which is especially important in actual welding quality. In this paper, based on SYSWELD software platform and finite element analysis method, double ellipsoid heat source model is selected to simulate the distribution of temperature field and stress-strain field in welding. First of all, the welding process of T-tube in the transportation of heating pipe is numerically simulated, and the infrared thermal imager is used to detect the distribution of temperature field in the welding process, and the data of the test result is processed. The results are compared with the analysis results, and combined with the verification data, the welding process is optimized to achieve the analysis result matching with the experiment, which makes the simulation analysis process have the guiding significance in the actual welding. On the basis of the above analysis, the welding simulation of the elbow flange in pipeline transportation shows that the maximum temperature in the welding process is about 1630 鈩，

本文編號：2000564