摘要
基于电弧增材逐层熔覆特性,单焊道成形质量对多层多道堆积成形具有重要影响。本文通过正交试验方法研究了TIG电弧增材技术中工艺参数对焊道余高及熔宽的影响规律,建立了焊道几何尺寸的数学模型。在此基础上进行了单道多层堆积及多道搭接实验,研究了其微观组织及显微硬度。结果表明:单层搭接时道间冷却充分,重叠部位分区明显,焊道两侧硬度大,不完全重结晶区域硬度较低;层间冷却5 s时堆积层分层不明显,顶层为片状组织,中下层大致为等轴晶组织,靠近基板的焊缝区硬度最大。
Based on the characteristics of layer-by-layer cladding,the quality of single bead forming has an important influence on multi-layer multi-pass stacking.In this paper,the influence of process parameters on weld bead height and width in TIG arc additive technology was studied by orthogonal test method,and the mathematical model of weld bead geometry was established.On this basis,single-pass multi-layer stacking and multi-pass lapping experiments were carried out to study the microstructure and microhardness.The results show that when the cooling time between the single-layer laps is sufficient,the overlapping area are obvious,the hardness of both sides of the bead is relatively larger than the incomplete recrystallization area.When the interlayer cooling is 5 s,the stratification of the deposit layers are not obvious,the top layer is lamellar structure,the middle and lower layers are roughly equiaxed crystal structures,and the hardness of the weld near the substrate is the largest.
作者
刘东帅
吕彦明
杨华
周文军
袁飞
Liu Dongshuai;Lü Yanming;Yang Hua;Zhou Wenjun;Yuan Fei(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment Technology,School of Mechanical Engineering,Jiangnan University,Jiangsu Wuxi 214122,China)
出处
《机械科学与技术》
CSCD
北大核心
2020年第9期1412-1418,共7页
Mechanical Science and Technology for Aerospace Engineering
关键词
TIG焊接
电弧增材
成形工艺
微观组织
力学性能
TIG surfacing
arc additive manufacture
forming technology
microstructure
mechanical properties
