摘要本文采用ADINA有限元软件,针对钛合金薄板对对接激光、MIG以及激光-MIG复合焊接过程的温度场进行模拟。主要进行了在不同焊接工艺参数下,薄板对接激光-MIG复合焊接的温度场的模拟,通过改变激光的功率,MIG的电流以及电压来分别模拟激光功率以及MIG的电流电压对于焊接温度场的影响,以及对于熔池熔深和熔宽的影响。最后得出了在不同激光功率下,激光的功率越大,平板温度梯度越小,熔深越大;在不同的MIG参数下,电流越大,熔深越大;电压越大,熔宽越大。7998
关键词 : 钛合金 激光-MIG复合焊接 温度场 ADINA
毕业设计说明书(论文)外文摘要
Title Numerical simulation of welding process of Titanium alloy engine
Abstract
In this paper , ADINA ,a software of finite element, was used to simulate the welding temperature field of laser、MIG and hybrid laser -MIG welding for titanium alloy sheet butt . The simulation of the hybrid laser -MIG welding temperature field under different parameters on thin plates was mainly carried out. By applying different laser power,the current and voltage of the MIG , the effects of them on the welding temperature as well as the weld pool penetration and width were explored. Finally conclusions were obtained that the greater the laser power was, the smaller the temperature gradient was and was greater of the penetration. Conclusions that the penetration was getting larger with the current developing and the width was larger with the voltage developing were also obtained.
Keywords: titanium alloy laser-MIG welding temperature distribution ADNIA
目 次
1 绪论 1
1.1 选题背景 1
1.2 数值模拟在焊接应用中的发展状况 1
1.2.1 国内外数值模拟在焊接中发展的状况 2
1.2.2 数值模拟存在的问题 2
1.3 本课题主要研究的内容 3
2 钛合金薄板激光-MIG复合焊模拟的数学模型 4
2.1 热源模型的选取 4
2.1.1 激光焊接热源模型 4
2.1.2 MIG焊接热源模型 6
2.1.3 激光-MIG复合焊接热源模型 7
2.2 焊接温度场有限元分析 8
2.2.1 基本假设 8
2.2.2 控制方程 8
2.2.3 初始条件和边界条件 9
2.3 本章小结 9
3 钛合金平板对接激光、MIG、激光-MIG焊接数值模拟 9
3.1 工艺试验模拟研究方案 10
3.2 网格的划分 11
3.3 材料的定义 12
3.4 载荷的施加 13
3.4.1 对流载荷的加载 13
3.4.2 内热载荷的加载 15
3.5 时间步长的选取 17
3.6 本章小结 17
4 激光-MIG复合焊接不同工艺下温度场的分析 17
4.1 单激光热源产生的温度场 18
4.2 单MIG热源产生的温度场 19
4.3 激光-MIG热源产生的温度场 20
4.3.1 激光功率对焊接温度场的影响 20
4.3.2 MIG焊接参数对焊接温度场的影响 23
4.4 本章小结 25
结 论 26
致 谢 27 ADINA钛合金发动机壳体焊接过程数值模拟:http://www.youerw.com/cailiao/lunwen_6166.html