摘要
为解决大尺寸车身侧围框架焊接总成的焊接变形问题,文章通过分析其基本焊接单元T形焊接结构的焊接顺序、焊接应力与焊接变形之间的关系,提出了一种基于焊接顺序优化的焊接变形控制思路。结果表明,当焊接四道焊缝时,后道次焊接可对前道次焊缝进行热处理,从而降低前道次焊缝的焊后残余应力峰值。应力峰值的降低使之对应的焊接变形有所降低。因此,在文章所研究的热输入条件下,相较于传统的对称焊接和顺序焊接,优先焊接自由状态条件下的焊接变形较小的焊接接头,随后焊接夹具约束状态下焊接变形较小的焊接接头可有效降低焊后变形,最大焊后变形量由6.5 mm减小到3.2 mm,下降约50.7%。
In order to solve the problem of welding deformation of large-size body side frame welding assembly,this paper proposes a welding deformation control idea based on welding sequence optimization by analyzing the relationship between welding sequence,welding stress and welding deformation of its basic welding unit T-shaped welding structure.The simulation results show that when welding fourpass joints,subsequent welding passes effectively perform heat treatment on prior welds,thereby reducing the peak residual stress in preceding weld seams.This stress reduction directly corresponds to decreased welding deformation.In this study,compared with conventional symmetrical and sequential welding methods,the proposed welding sequence of welding joints with smaller deformation under the free state firstly and then welding joints with smaller deformation under the constrained state of the clamping can effectively reduce welding deformation.Using the optimized welding sequence,the welding distortion decreases by 50.7%,from 6.5 mm to 3.2 mm.
作者
秦坤伦
陈夏明
章嘉婕
宋佳
李峻
长海博文
QIN Kunlun;CHEN Xiaming;ZHANG Jiajie;SONG Jia;LI Jun;NAGAUMI Hiromi(Weiqiao Lightweight Research Center at Soochow,Suzhou 215100,CHN;High-performance Metal Structural Materials Research Institute,Soochow University,Suzhou 215006,CHN)
出处
《制造技术与机床》
北大核心
2025年第7期174-181,共8页
Manufacturing Technology & Machine Tool
基金
魏桥轻量化基地重大科研项目“多材料高铝化车身及底盘低热变形高强韧高服役连接关键技术”(BSZYJY-QLHDY-2021-004)。
关键词
数值模拟
铝合金
残余应力
焊接顺序
焊接变形
numerical simulation
aluminum alloy
residual stress
welding sequence
welding deformation
