5356铝合金Tri-arc DE双丝三电弧焊接工艺研究

发布时间：2018-04-06 22:32

本文选题：Tri-arc　切入点：5356铝合金双丝焊　出处：《沈阳工业大学》2017年硕士论文

【摘要】：本课题是对一种新型的Tri-arc DE双丝三电弧焊接方法进行的铝合金焊接工艺探究。这种新型的双丝焊,不但在两根焊丝与工件之间建立了两个电弧,还在两焊丝之间建立了第三电弧M弧,新引入的第三电弧可以调节流经焊丝和工件的比例,对铝合金的熔丝增材制造具有很高的应用前景。首先,利用高速摄像,拍摄焊接电弧和熔滴。随着送丝速度增加,焊丝干伸长变大,弧长相应减小,电弧被压扁;电弧能量随着送丝速度的增加,呈现先集中后分散的趋势;在电弧电压升高时,弧柱逐渐拉长,电弧越来越烁亮,电弧能量增大;熔滴过渡形式起初是短路过渡,当调节增大M电流,过渡形式变化为短路过渡和射流过渡的混合过渡形式。其次,通过阴极清理宽度来衡量清理效果对铝合金的氧化膜阴极清理进行了探究。随着送丝速度的增加,清理宽度增加;而随着M弧的电流的增加,阴极清理宽度越来越小,效果逐渐变差;导电嘴到工件的距离应设置在10~15mm之间可以获得最佳的清理效果;采用高纯氩气做保护气体焊接时的阴极清理宽度明显大于普通氩气的清理宽度。再次,对焊接参数对焊缝成形性的影响进行了研究。随着送丝速度的增大,熔敷率是接近于线性增加的,焊缝成形系数的变化呈先减小后增大的趋势变化;调节增大M电流,可以减少流入工件的电流,以起到减小焊接应力与变形的作用,使得焊接变形明显减少。最后,对5356铝合金焊接接头进行了力学性能测试、显微分析以及气孔率的探究。经实验获得,当焊接电压25V、送丝速度6.0m/min,M电流为36A时,能够获得最佳综合性能的焊接接头。
[Abstract]:In this paper, a new type of Tri-arc DE double wire three arc welding process for aluminum alloy is studied.This new type of double wire welding not only establishes two arcs between the two wires and the workpiece, but also establishes the third arc M-arc between the two wires. The newly introduced third arc can adjust the ratio of the flow through the wire to the workpiece.It has a high prospect of application in the fabrication of aluminum alloy.First, the welding arc and droplet are photographed by high speed camera.With the increase of wire feeding speed, the wire dry elongation becomes larger, the arc length decreases accordingly, the arc is flattened, the arc energy increases with the wire feeding speed, and the arc energy is concentrated first and then dispersed. When the arc voltage increases, the arc column gradually elongates.The arc becomes more bright and the arc energy increases, and the droplet transfer is initially a short-circuit transition. When the M current is increased, the transition form changes to a mixed transition form of short-circuit transition and jet transition.Secondly, the cathodic cleaning of aluminum alloy oxide film was studied by measuring the cleaning effect by cathodic cleaning width.With the increase of wire feeding speed, the cleaning width increases, and with the increase of M-arc current, the cathodic cleaning width becomes smaller and the effect becomes worse, the distance from the conductive nozzle to the workpiece should be set between 10~15mm to obtain the best cleaning effect.The cathodic cleaning width of high purity argon is larger than that of common argon.Thirdly, the influence of welding parameters on weld formability is studied.With the increase of wire feeding speed, the deposition rate is close to the linear increase, and the change of weld forming coefficient decreases first and then increases, and when M current is increased, the current flowing into workpiece can be reduced.In order to reduce the welding stress and deformation, the welding deformation is obviously reduced.Finally, the mechanical properties, microanalysis and porosity of 5356 aluminum alloy welded joints were tested.The experimental results show that when the welding voltage is 25V and the wire feeding speed is 6.0m / min M current 36A, the best comprehensive performance welding joint can be obtained.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG457.14

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