摘要
在载人航天器、飞机、船舶的加工制造过程中,焊接技术发挥着越来越重要作用。如何确定焊接参数、选择焊接方式等一直是领域内的难题。本文立足于为载人航天器、飞机、船舶等的焊接提供一定的理论参考,利用有限元方法完成了钛合金薄板激光焊接的温度场与应力场模拟及分析。首先,利用JMatPro软件计算Ti75钛合金的热物理性能及力学性能。之后,利用Hypermesh软件对薄板进行网格划分,生成靠近焊缝区域的密集,远离焊缝区域疏松的网格,以减少计算时间。最后,利用Simufact.welding软件实现了在焊接输入功率为定值3200W下两类激光焊接速度的温度场与应力场模拟。仿真结果表明:在固定焊接输入功率时,焊接速度对焊接质量的影响较大,若焊接速度过小,易导致焊件局部温度过高。若焊接速度过大,易导致焊缝中心处等效残余应力变大,因此本文的研究工作将有利于钛合金材料焊接技术的发展。
Welding technology plays important role in the processing and manufacturing of manned spacecrafts,aircrafts, and ships. How to determine the welding parameters and choose the welding type has always been a challenging problem. Aiming at providing a framework for the welding of manned spacecrafts, aircrafts, and ships, this paper employs FEM to achieve the temperature field and stress field analysis of the titanium alloy thin plate. Firstly,JMatPro software is used to calculate the thermophysical and mechanical properties of Ti75 titanium alloy. Secondly,Hypermesh software is used to mesh the thin plate to generate meshes, which are densely close to the weld area and loose far away from the weld area. This type of meshes can efficiently reduce the computation cost. Finally, Simufact welding software is used to simulate the temperature field and the stress field of the two types of laser welding speeds at a constant welding input power of 3200W. The results show that when the welding input power is fixed, the welding speed has a greater influence on the welding quality. If the welding speed is too small, it is easy to cause the high temperature of the weld area. If the welding speed is too high, it is easy to cause the high equivalent residual stress of the weld area. Overall, this study can promote the development of the welding technique of the titanium alloy material.
作者
陈蕾蕾
刘向前
张新杰
徐海涛
CHEN Lei-lei;LIU Xiang-qian;ZHANG Xin-jie;XU Hai-tao(Luoyang Sunrui Special Equipment CO.,LTD,Luoyang 471031,China;Luoyang Ship Material Research Institute,Luoyang 471023,China;Research&Development Institute in Shenzhen,Northwestern Polytechnical University,Shenzhen 518057,China)
出处
《强度与环境》
CSCD
2021年第5期45-51,共7页
Structure & Environment Engineering
基金
深圳市基础研究面上项目(JCYJ20190806153615091)。
