摘要
为研究铝合金钨极氩弧焊（Tungsten Inert Gas Welding,TIG）温度场的分布规律及焊接熔池的形貌特征,采用ABAQUS有限元软件建立了平板堆焊模型,进行了数值模拟与仿真。结果显示：在焊接方向上,焊接温度云图等温线呈前疏后密的分布特征;焊缝横截面的等温线呈一组同心半椭圆形貌。通过铝合金TIG焊接试验验证了仿真分析结果的准确性,试验采用150 mm×100 mm×10 mm的5056铝合金为焊接基板和直径为2 mm的2218铝铜合金丝材为焊丝,以不同电流值,在数控三轴联动平台上进行了单道焊接试验。结果表明,当输入电流增大时,熔池的宽度减小,熔池的深度增加,试验结果与数值仿真分析相吻合。并对焊接过程中存在偏析、裂纹、气孔、咬边等缺陷进行了分析,提出了具体解决措施。
In order to study the temperature field and morphology characteristics of weld pool during tungsten inert gas（TIG） welding of aluminum alloy, the plate surfacing model was established by using ABAQUS finite element software and the surfacing process was simulated. The results show that the isotherm of welding temperature shows the distribution characteristics that the fromt is sparse and the rear is dense along the welding direction. The isotherms of the cross section of the welding seam show the concentric semi elliptical shapes. The accuracy of simulation analysis was verified by TIG welding test of aluminum alloy. Taking 5056 aluminum alloy plate with 150 mm×100 mm×10 mm as the substrate and 2218 aluminum copper alloy wire with diameter of 2 mm as welding wire, the single-pass welding test was carried out on the NC three-axis linkage platform with different currents. The results show that with the increase of the current, the width of the molten pool decreases and the depth of the molten pool increases. The experimental results are in agreement with the numerical simulation analysis. The defects such as segregation, crack, blowhole and undercut in welding process were analyzed, and the solutions were put forward.
作者
陈建刚
魏正英
杜军
舒林森
CHEN Jian＇gang;WEI Zhengying;DU Jun;SHU Linsen(School of Mechanical Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China;School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723001, China)
出处
《热加工工艺》
CSCD
北大核心
2018年第7期181-184,188,共5页
Hot Working Technology
基金
国家重点研发计划专项项目(2016YFB1100400)
国家自然科学青年基金资助项目(51505268)
陕西省教育厅2016年专项科研项目(16JK1145)
陕西理工大学科研计划资助项目(SLGKY2017-22)
关键词
钨极氩弧焊
铝合金
熔池形貌
数值仿真
tungsten argon arc welding
aluminum alloy
weld pool shape
numerical simulation
