基于Lab VIEW的熔化极等离子弧焊接电弧电信号分析

在熔化极等离子弧焊接(plasma-MIG)试验系统基础上,设计电流、电压信号采集系统,对其电弧电特性信号进行采集,用虚拟仪器软件LabVIEW对其进行处理,得到U-t,I-t,U-I相图.比较了熔化极等离子弧焊与常规熔化极气体保护焊电弧电信号的不同,前者电流、电压波动很小,后者波动很大;研究了熔化极等离子弧焊接方法中MIG电流增大对电弧电信号的影响,并对熔化极等离子弧焊接的不稳定电弧电信号进行了分析,发现内弧对外弧的影响有一定规律性.     

等离子——熔化极气体保护焊设备及其应用

介绍了等离子-熔化极气体保护焊接的工艺过程,并与常规熔化极气体保护焊相比较分析了焊接过程的优缺点。对等离子-熔化极气体保护焊接的应用及焊枪的发展作了简要的描述。     

Modelling of the plasma-MIG welding temperature field

A three-dimensional simulation model for the plasma-MIG welding process, which takes the interaction between the plasma arc and MIG arc into account, is presented and the quasi-steady temperature fields on the workpiece are calculated with the model. The 10 mm-5A06 aluminum alloy is welded and the temperature fields are measured with the thermoelectric couple. The simulation results and measured results show that the biggest deviation of peak temperature between them is below 20 ℃, which indicates good coincidence between the simulation and measurement.     

等离子-MIG焊接设备的设计与研制

为解决厚壁铝及铝合金构件的焊接效率低的实际问题，提出了等离子-MIG双电弧高效焊接新方法.该方法是采用双电源和双电弧共枪体等技术，完成等离子-MIG焊接设备的研制.所研制的设备以PLC为主控单元, 设计了焊接参数专家库管理系统,同时，还采用了有限元模拟技术研究了该设备的核心组件——等离子-MIG枪体内部的水流场和温度场,为枪体的设计和结构优化提供了重要的参考数据, 该焊接方法已应用于三峡电站大型开关断路器的制造工程中.     

Influence of plasma-MIG welding parameters on aluminum weld porosity by orthogonal test

The plasma-MIG welding torch was developed.5A06 aluminum alloys with V-grooves were welded in a single pass in the plasma-MIG welding process and the joints were examined by X-ray diffractometry analysis and mechanical tests.The orthogonal experimental design was used to study the influence of plasma-MIG welding parameters on the aluminum weld porosity.The mixed orthogonal matrix L16(4 4×2 3) and analysis of variance (ANOVA)technique were employed to optimize the welding parameters.The experimental results indicate that the effect of plasma gas flow rate is dominant,the secondary factors are MIG welding voltage,welding speed,wire feed rate and plasma current in turn.Confirmation experiments were conducted under optimum conditions and there was almost no porosity in the welded joints,thus good mechanical performance joints were obtained.     

等离子-MIG焊在有色金属焊接中的应用研究现状及展望

随着复合焊接成为焊接领域的热点,等离子-MIG焊作为一种高能量束流的焊接方法得到了广泛的研究,等离子-MIG焊具备阴极雾化的功能,有利于清理金属表面的氧化膜,对有色金属焊接有独特的优势。介绍了同轴式和旁轴式等离子-MIG焊的工作原理及优缺点,从数值模拟、控制与监测方法、工艺参数研究3个方面对等离子-MIG焊在有色金属焊接中的应用研究现状进行了分析。分析结果表明,等离子-MIG焊在铝合金材料焊接中研究进展显著,已经能够实现高质量的焊接,并开展了在镁、铜等其他有色金属焊接方面的研究,取得了一定的效果。最后对等离子-MIG焊的应用前景和发展方向进行了展望,等离子MIG焊在双电弧耦合机理、多物理场的协同工作、系统稳定性等方面还有待深入研究。     

Plasma-MIG复合电弧焊接特性分析

采用Plasma-MIG复合电弧对Q235低碳钢进行堆焊试验,对焊接过程中复合电弧形态、电弧空间分布、焊缝成形及细晶原理进行了分析.结果表明,Plasma-MIG复合电弧焊接过程中,外层等离子电弧单独存在,内层MIG电弧在焊丝端部与外层等离子弧耦合.复合电弧空间温度分布均匀,高温停留时间短,冷却速度快.Plasma-MIG复合电弧在大的等离子电流下,促进填充金属润湿铺展,焊缝熔宽大,成形美观.相同热输入量条件下,等离子电流增大能够促进晶粒自发形核,原奥氏体晶粒及焊缝组织得到细化.     

Microstructure and mechanical properties of the joint of 6061 aluminum alloy by plasma-MIG hybrid welding

Plasma-MIG (metal inert gas arc welding) hybrid welding of 6061 aluminum alloy with 6 mm thickness using ER5356 welding wire was carried out.The microstructures and mechanical properties of the welded joint were investigated by optical microscopy,X-ray diffraction (XRD),energy dispersive spectroscopy (EDS),tensile test,hardness test and scanning electron microscope (SEM) were used to judge the type of tensile fracture.The results showed that the tensile strength of welded joint was 142 MPa which was 53.6％ of the strength of the base metal.The welding seam zone was characterized by dendritic structure.In the fusion zone,the columnar grains existed at one side of the welding seam.The fibrous organization was found in the base metal,and also in the heat affected zone (HAZ) where the recrystallization occurred.The HAZ was the weakest position of the welded joint due to the coarsening of Mg2Si phase.The type of tensile fracture was ductile fracture.     

6005铝合金中厚板等离子-MIG复合焊接头组织与力学性能

采用等离子-MIG复合焊工艺对16 mm厚6005铝合金进行双面焊接,研究焊接接头的显微组织和力学性能。结果表明,焊缝区为等轴树枝晶,熔合线附近为柱状晶组织,热影响区相比母材组织粗化;接头各区显微硬度值均低于母材;接头的侧弯试验可达180°;抗拉强度201 MPa,为母材强度的77.31%,断裂位置在热影响区内。     

等离子-MIG焊接方法在厚壁铝合金构件焊接中的应用

等离子-MIG焊接是一种双电弧高效焊接方法,特别适合于厚壁铝及铝合金构件的焊接.叙述了1种自动等离子-MIG焊接设备的设计和研制过程,及其在三峡电站大型开关断路器铝制壳体制造中的应用.