鋁合金激光深熔焊溫度場(chǎng)數(shù)值模擬及改善方案研究
[Abstract]:Laser welding technology has been widely used in industrial production because of its high rate, high precision and high reliability. Laser welding of aluminum alloy is a complicated physical and chemical process. The laser welding of aluminum alloy is easy to produce defects such as surface collapse and internal porosity. It takes a long time and high cost of materials. Researchers at home and abroad have carried out effective research on laser welding of aluminum alloy by means of combination of experiment and numerical analysis. The selection of heat source in numerical simulation is the key to the simulation calculation. In this paper, the three-dimensional temperature field of aluminum alloy is simulated with double Gao Si cylinder heat source, and the influence of laser welding process parameters on weld forming is studied. And through the experimental verification, it has important academic value and practical significance. Welding material is 1mm thick 6061 aluminum alloy, laser type is YLS-2000. Firstly, according to the research status of numerical simulation of laser welding at home and abroad, combined with the characteristics of material properties of thin plate aluminum alloy, the technical scheme of adopting double Gao Si cylindrical heat source model is put forward. The 3D numerical simulation model of laser welding of 6061 aluminum alloy with 1mm thickness was established by loading the model with the UDF program defined by FLUENT software, and the numerical simulation of temperature field of laser deep fusion welding aluminum alloy was completed. Secondly, through the analysis of the results of numerical simulation, the research scheme of process test is determined, and the mesh and solution parameters in numerical simulation are adjusted through the results of many experiments, until the simulation results are in good agreement with the experimental results. Finally, the simulation and test results are summarized, and the influence of process parameters on weld forming is obtained, which provides a theoretical basis for quantitative data and numerical simulation for laser welded aluminum alloy sheet. In this paper, two schemes to improve weld quality are introduced. One is to change the tilting angle of the workpiece, and the other is to combine the numerical simulation with the process test, which proves that the welding method has the effect of improving the collapse and the porosity of the workpiece, and the other is the laser repeated welding of the workpiece. Only the research method of process test is adopted. It is concluded that this welding method can improve the porosity of weld without penetration, but it is not suitable for the penetration of workpiece.
【學(xué)位授予單位】:南昌大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TG457.14
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 田志騫;馬國(guó)龍;石業(yè)勇;王鵬;;鋁合金激光焊接氣孔缺陷形成及抑制機(jī)理[J];電焊機(jī);2016年09期
2 陳根余;陳曉鋒;周聰;李時(shí)春;廖生慧;;激光深熔焊細(xì)長(zhǎng)小孔數(shù)值模擬與試驗(yàn)研究[J];激光技術(shù);2015年02期
3 萬(wàn)海波;李強(qiáng);冷曉春;吳祖乾;沈耀;;不銹鋼中厚板激光全熔透焊的有限元模擬[J];動(dòng)力工程學(xué)報(bào);2014年02期
4 孫欽德;李萌盛;宋榮武;;深熔激光焊新型熱源模型的研究[J];焊接技術(shù);2010年12期
5 龐盛永;陳立亮;殷亞軍;胡倫驥;段愛(ài)琴;;激光焊接瞬態(tài)小孔與運(yùn)動(dòng)熔池行為模擬[J];焊接學(xué)報(bào);2010年02期
6 姚偉;鞏水利;Steve Shi;;鋁合金激光雙光點(diǎn)焊接工藝特性[J];焊接學(xué)報(bào);2007年04期
7 李曉娜;許先果;邊美華;;激光焊接在汽車(chē)工業(yè)中的應(yīng)用[J];電焊機(jī);2006年04期
8 杜漢斌;胡倫驥;王東川;孫成智;;激光穿透焊溫度場(chǎng)及流動(dòng)場(chǎng)的數(shù)值模擬[J];焊接學(xué)報(bào);2005年12期
9 齊向前,李玉昌,武建軍,童翔;鋁合金激光焊接技術(shù)特性[J];焊接技術(shù);2005年03期
10 徐煒 ,李章;大功率激光焊接技術(shù)及其工業(yè)應(yīng)用[J];機(jī)械工人;2005年03期
相關(guān)博士學(xué)位論文 前5條
1 李飛;5083鋁合金光纖激光—變極性TIG復(fù)合焊接工藝及機(jī)理研究[D];北京工業(yè)大學(xué);2014年
2 張盛海;激光深熔焊接過(guò)程的數(shù)值模擬與等離子體控制研究[D];南京航空航天大學(xué);2014年
3 王軍;鋁合金光纖激光及其復(fù)合焊接的等離子體行為與工藝研究[D];華中科技大學(xué);2012年
4 龐盛永;激光深熔焊接瞬態(tài)小孔和運(yùn)動(dòng)熔池行為及相關(guān)機(jī)理研究[D];華中科技大學(xué);2011年
5 祁俊峰;全鋁結(jié)構(gòu)船長(zhǎng)甲板的CO_2激光焊接技術(shù)研究[D];北京工業(yè)大學(xué);2008年
相關(guān)碩士學(xué)位論文 前8條
1 姜夢(mèng);真空環(huán)境下激光焊接等離子體特性研究[D];哈爾濱工業(yè)大學(xué);2015年
2 王孝虎;鋁合金激光填絲焊缺陷分析及改進(jìn)措施研究[D];哈爾濱工業(yè)大學(xué);2015年
3 李京;高速列車(chē)6061鋁合金激光焊接工藝研究[D];石家莊鐵道大學(xué);2015年
4 陳曉鋒;激光深熔焊接厚板細(xì)長(zhǎng)小孔瞬態(tài)形成過(guò)程模擬研究[D];湖南大學(xué);2014年
5 周宇;高功率光纖激光深熔焊接厚板的塌陷成因及其控制研究[D];湖南大學(xué);2014年
6 張亞斌;基于Fluent的鋁合金電子束深熔焊三維流場(chǎng)數(shù)值模擬[D];哈爾濱工業(yè)大學(xué);2007年
7 黃瑞;1420鋁鋰合金的雙光束激光焊接[D];北京工業(yè)大學(xué);2007年
8 呂宏振;鋁合金激光立焊焊接特性及氣孔問(wèn)題研究[D];哈爾濱工業(yè)大學(xué);2006年
,本文編號(hào):2237882
本文鏈接:http://sikaile.net/kejilunwen/jiagonggongyi/2237882.html