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

【摘要】：在現(xiàn)代工業(yè)生產(chǎn)中焊接技術(shù)被廣泛應(yīng)用,焊接過(guò)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(chǎn)生殘余應(yīng)力及變形,嚴(yán)重影響其焊接質(zhì)量和使用性能,因此掌握焊接中焊縫區(qū)域溫度場(chǎng)的變化、焊接過(guò)程中殘余應(yīng)力的分布及應(yīng)力引起的變形規(guī)律,在實(shí)際焊接質(zhì)量尤為重要。本文采用有限元分析方法,基于SYSWELD軟件平臺(tái),選取雙橢球體熱源模型,對(duì)焊接中溫度場(chǎng)及應(yīng)力應(yīng)變場(chǎng)分布進(jìn)行模擬仿真。首先對(duì)暖氣管道運(yùn)輸中T形管焊接過(guò)程進(jìn)行數(shù)值模擬,并結(jié)合現(xiàn)有實(shí)驗(yàn)設(shè)備,利用紅外熱成像儀對(duì)焊接過(guò)程中溫度場(chǎng)分布進(jìn)行實(shí)時(shí)檢測(cè),對(duì)檢測(cè)結(jié)果進(jìn)行數(shù)據(jù)處理,與分析結(jié)果進(jìn)行對(duì)比驗(yàn)證;結(jié)合驗(yàn)證數(shù)據(jù),對(duì)焊接過(guò)程進(jìn)行優(yōu)化處理,達(dá)到與實(shí)驗(yàn)相匹配的分析結(jié)果,使模擬分析過(guò)程在實(shí)際焊接中具有指導(dǎo)意義。在以上分析基礎(chǔ)之上,對(duì)管道運(yùn)輸中彎管法蘭焊接模擬仿真,得出焊接過(guò)程中最高溫度在1630℃左右,與實(shí)驗(yàn)驗(yàn)證溫度場(chǎng)分布相符;在300s時(shí)刻最大應(yīng)力max??369.46MPa,在其抗拉強(qiáng)度490~675MPa范圍之內(nèi);最大應(yīng)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(duì)其后續(xù)安裝過(guò)程及焊接后工件的垂直度產(chǎn)生影響;因此,對(duì)裝卡條件進(jìn)行優(yōu)化,在彎管處施加裝卡條件阻止剛性體運(yùn)動(dòng)。重新對(duì)整體進(jìn)行分析,得到整體最大應(yīng)變max??0.29mm,在彎管端面處應(yīng)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(yīng)焊接過(guò)程中溫度及應(yīng)力應(yīng)變場(chǎng)分布情況,可通過(guò)改變焊接路徑和優(yōu)化工藝參數(shù)等保證焊接質(zhì)量,大大縮短了焊接實(shí)驗(yàn)周期、節(jié)約了實(shí)驗(yàn)成本,對(duì)管道安裝中焊接過(guò)程起到指導(dǎo)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(hào)：2000564