共查询到20条相似文献,搜索用时 569 毫秒
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本文从电弧的静特性要求,分析弧焊电源的外特性。阐述弧焊逆变器的丰要组成及各部分的作用。介绍电量传感器的组战、特点,及其在弧焊逆变器的应用。 相似文献
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本研究首创了微型计算机——可控硅弧焊整流器试验系统,该系统可通过改变计算机程序参数的给定值而在很大范围内连续调节可控硅弧焊整流器的动特性参数。试验结果表明,该微机实时控制系统成功地控制了可控硅弧焊整流器的动特性,具有实用性和可靠性。本微机实时控制系统为进一步研究和发展可控硅弧焊整流器创造了条件。 相似文献
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直流弧焊电源的现状及发展趋势强健(陕西省设备安装工程公司)1.对弧焊电源的基本要求弧焊电源是供给焊接电弧能量的装置,是电弧焊接必不可少的设备。‘弧焊电源根据其输出电流的性质,通常分为交流电源和直流电源。由于电弧是一个特殊的用电器,它既不是电阻性负载,... 相似文献
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做好焊接设备换代 促进企业技术进步闫克胜(北京核工业总公司23建设公司北京101601)直流电焊机制造业大体上经历了旋转式弧焊发电机、晶闸管弧焊整流器、逆变弧焊电源三个发展阶段。以相同输出功率的三种有代表性的机型对比(见表1),可以看出新一代产品的节... 相似文献
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介绍了一种铁路空调客车逆变器故障诊断系统.下位机以高性价比的DSPTMS320C32为核心构造,对逆变器的数据进行高速采集,同时采用加窗FFT变换,得出逆变器输出频谱;上位机检测并显示逆变器运行数据和状态,应用专家系统,对逆变器的运行状态进行在线诊断. 相似文献
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This paper proposes a novel triple-wire gas indirect arc welding process. The welding system consists of two power sources and three wires. The effects of the power source mode and the wire configuration on arc stability and behavior are studied. The metal transfer is analyzed and bead-on-plate welding is employed. Results show that two direct current power sources cannot produce a stable process, but the combination of a direct current with a pulsed direct current can produce a stable process. The reason is that the pulsed direct current can boost and stabilize the metal transfer. For the wire configuration, a smaller contact angle between the main wire and the side wire is more desirable. Compared with the traditional gas metal arc welding, this novel process has the advantages of high wire melting rate, low penetration depth, and low dilution rate. Compared with twin-wire gas indirect arc welding, it provides a broader range of applicable currents with sufficient heat input. 相似文献
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目的 介绍一种称为Tri-Arc的新型双丝电弧焊接方法。方法 将Tri-Arc双丝电弧焊与应用较广的Tandem双丝电弧焊的系统构成和焊接电流波形进行对比分析。结果 Tri-Arc和Tandem两种双丝电弧焊接方法所使用的双丝焊枪相近,双电源相位同步控制和U/I脉冲控制方式类似。Tri-Arc和Tandem两种双丝电弧焊接方法的差异在于:Tandem双丝电弧焊的2个电弧是相对独立的,而Tri-Arc双丝电弧焊的2个电弧是相互耦合的,因此Tri-Arc双丝电弧焊又具有旁路耦合电弧的某些特点。结论 这种新型的Tri-Arc双丝电弧焊不仅具有与Tandem双丝电弧焊一样的高焊丝熔敷率,而且具有比Tandem双丝电弧焊更低的焊接热输入。 相似文献
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Robust sensing of arc length 总被引:4,自引:0,他引:4
During arc welding, the arc heats and melts the workpiece as heat flux. When the welding current is given, the distribution and the intensity of the heat flux are determined by the length of the are. The measurement and control of the are length are fundamental in robotic and automated welding operations. Length of welding arc determines the distribution of the arc energy and thus the heat input and width of the weld. This work aims at improving the measurement accuracy of arc length using the spectrum of are light at a particular wavelength during gas tungsten arc welding (GTAW) with argon shield. To this end, effects of welding parameters on spectral distributions were studied. To verify the effects of base metal and arc length, the arc column was also sampled horizontally as Layers for spectral analysis. Results show that spectral lines of argon atoms are determined by are length, independent of welding parameters other than the current. Based on these findings, a compact arc light sensor has been designed to measure the arc length with adequate accuracy. A closed-loop arc length control system has been developed with the proposed sensor 相似文献
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Dong Honggang Gao Hongming Wu Lin 《International journal for numerical methods in engineering》2006,65(10):1673-1687
Double‐sided arc welding process powered by a single supply is a type of novel high‐production process. In comparison with the conventional single‐sided arc welding, this process has remarkable advantages in enhancing penetration, minimizing distortion and improving welding production. In this paper, a three‐dimensional steady numerical model is developed for the heat transfer and fluid flow in plasma arc (PA)–gas tungsten arc (GTA) double‐sided keyhole welding process. The model considers the surface tension gradient, electromagnetic force and buoyancy force. A CCD camera is used to observe the size and shape of the keyhole and weld pool. The acquired images are analysed through image processing to obtain the surface diameters of the keyhole on the two sides. A double‐V‐shaped keyhole geometry is then proposed and its characteristic parameters are derived from the images and cross‐section of weld bead. In the numerical model, the keyhole cavum within the weld pool is treated as a whole quality, whose temperature is fixed at the boiling point of the workpiece material. The heat exchange between the keyhole and weld pool is treated as an interior boundary of the workpiece. Based on the numerical model, the distributions of the fluid flow and temperature field are calculated. A comparison of cross‐section of the weld bead with the experimental result shows that the numerical model's accuracy is reasonable. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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Screw failure is one of the main scrap forms for rear axle tube, and thread turning after surfacing is a common means of remanufacturing. This paper takes rear axle tube as the main research topic, which is made of 40Mn and provided by an axle company. Manual electric arc welding, CO2 shielded arc welding and argon shielded arc welding are carried to overlay the damaged thread. The deposited metal consists of two welding material lays.Welding process and overlay properties are characterized by the test and analysis of microstructure, residual stress and hardness of surfacing layers. The results show that
argon shielded arc welding is an effective method to repair the failure thread; its microstructure of fusion area is meticulous and uniform; its residual compressive stress (absolute value) of welding surface is the biggest among the three welding methods; its hardness curve is relatively flat and appropriate for turning. 相似文献
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超声场作为一种高效清洁的物理场在电弧焊接中具有越来越多的应用。在电弧焊接过程中,引入超声,可以有效改善电弧形态、熔滴过渡以及焊缝组织,最终提高焊接接头力学性能。超声在电弧焊接过程中的应用特点主要与超声施加方法有关,不同的超声施加方法具有不同的特点,根据不同的超声施加方法可将超声电弧复合焊接分为不同类型。主要综述了电弧超声技术、超声与电弧同轴复合、超声作用于焊丝以及超声工具头作用于固体母材或者焊缝表面4种技术的各自特点及研究进展,着重分析了不同技术的设备特点及其对组织与力学性能的影响。最后对该方向的研究进展进行了总结,并对其发展前景和主要发展方向进行了展望。 相似文献
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随着现代工业生产技术的发展,超声波在材料加工领域应用越来越广泛,相继出现了多种超声波与焊接相结合的方式,在一定程度上提高了焊接质量和生产效率,增强了焊接的适应性。详细介绍了一种超声电弧技术,即利用外加超声源调控等离子电弧作为相应热源进行焊接的技术。电弧试验研究显示,受超声调制的等离子电弧呈规则的圆锥形,压缩明显,电弧中心区压力增大。在焊接试验中,发现施加超声后,焊接熔滴尺寸更小,过渡频率明显增加,焊缝的熔宽和熔深都不同程度增加。利用该方法可以克服普通电弧焊接熔深浅、电弧能量不集中、焊接效率低等缺点。 相似文献
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