共查询到19条相似文献,搜索用时 109 毫秒
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采用高速摄影技术和汉诺威焊接参数分析仪,对国内外代表性的药芯焊丝CO2焊的熔滴过渡过程、电弧行为、飞溅、烟雾等电弧物理现象进行了大量的观察,总结了各种药芯焊丝熔滴过渡形式和电弧行为的特点,对各种过渡形式工艺性进行了初步评价。 相似文献
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钛型渣系 气保护药芯焊丝的冶金过程与工艺特性探讨 总被引:4,自引:0,他引:4
孙咸 《机械工人(热加工)》2004,(8):26-28
分析了钛型渣系气保护药芯焊丝的化学冶金过程、熔渣特性及工艺性能。结果表明,该药芯焊丝的焊接化学冶金过程是分区连续进行的,药芯焊丝熔滴过渡中伴随渣柱,以及渣柱直接进入熔池现象,可能导致焊接化学?台金反应不完全和冶金过程的新变化。焊接熔渣的碱度很小,渣中TiO2量较多,容易形成“短渣”,有利全位置焊接工艺性,渣中的硅酸盐和酸性氧化物具有细化熔滴作用,能够改善熔滴的过渡特性;熔滴的非轴向过渡,在较大电流时变为沿渣柱的射滴过渡形态,使焊丝的工艺性变得非常优良。这是药芯焊丝在高效、自动化焊接中所具备的独特优势之一。 相似文献
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钛型渣系气保护药芯焊丝熔滴过渡及其控制 总被引:3,自引:0,他引:3
孙咸 《机械工人(热加工)》2005,(5):26-29
从熔滴过渡形态及分类、过渡形态与工艺性关系、熔滴过渡机理、熔滴过渡影响因素及控制等方面.探讨了钛型渣系气保护药芯焊丝熔滴过渡及其控制原理。结果表明.该焊丝熔滴过渡的基本形态是非轴向滴状过渡.在电弧电压较纸瞬时,亦会发生短路过渡行为这类焊丝熔滴过渡形态对工艺性的影响,取决于焊接规范参数的变化.主要是焊接电流.并通过影响熔滴过渡指数.进而使工艺性指标发生之,依据该焊丝熔滴形成过程特点,建立了药芯焊丝熔滴过渡受力模型,焊接电流变化时.不同的作用力对熔滴过渡起主要作用。通过调整药芯组成物,选择焊丝截面形状,改变焊丝直径和钢带厚度.优化焊接工艺参数.改变作用于熔滴上相关力的大小或方向.最终实现对熔滴过渡的控制。 相似文献
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孙咸 《机械工人(热加工)》2014,(6)
分析了GMAW熔滴过渡形态,重点探讨了钛型渣系CO2气体保护药芯焊丝的电弧、熔滴过渡特性,并以工程应用实例论证该类焊丝熔滴主流过渡形态。结果表明,GMAW用焊丝的工艺质量很大程度取决于熔滴过渡形态和电弧行为。熔化极气体保护电弧焊主要熔滴过渡形态是滴状过渡、短路过渡和喷射过渡。钛型渣系CO2气体保护药芯焊丝的电弧形态应属于活动、连续型,在大电流、强规范(含高的电弧电压)条件下施焊时,该焊丝熔滴主流过渡形态是非轴向滴状过渡。 相似文献
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采用自制熔滴收集装置、高速摄影仪、电弧焊质量分析仪研究了在电流小于100A条件下焊接时焊缝金属中硅锰质量比对E308LT0-1不锈钢药芯焊丝熔滴过渡及电弧稳定性的影响。结果表明:随着焊缝金属中硅锰质量比的增大,焊接过程中大尺寸熔滴占比先降后增,小尺寸熔滴占比先增后降,当硅锰质量比为0.311时,小尺寸熔滴占比最大,大尺寸熔滴占比几乎最小;不锈钢药芯焊丝的熔滴过渡形式主要为非轴向短路过渡,当硅锰质量比为0.311时,熔滴过渡最平稳,飞溅程度最低,电弧稳定性最好。 相似文献
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国产气保护药芯焊丝的质量问题及对策 总被引:5,自引:0,他引:5
孙咸 《机械工人(热加工)》2003,(8):15-18
分析了国产气保护药芯焊丝存在的工艺质量问题,从药芯配方设计、熔滴过渡形态的控制两方面探讨了气保护药芯焊丝工艺质量改进机理,提出了气保护药芯焊丝工艺质量的改进途径。结果表明,对钛型渣系焊丝,控制熔滴略微粗化,过渡频率适当降低,获得清晰的焊波,提高抗气孔性能;对碱性渣系焊丝,控制电弧形态特性,减弱熔滴斑点压力,改善熔渣特性,采用有效操作技术,改善焊丝的立向上焊接工艺性。 相似文献
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CO2气保护药芯焊丝熔滴行为对药芯焊丝工艺性有直接的影响,不同的熔滴行为可间接反映在焊接过程电信号的变化中.利用汉诺威弧焊分析仪对CO2气保护药芯焊丝的焊接电参数进行测试分析,提取短路大电流概率密度和、短路过渡频率、瞬时短路频率以及瞬时短路时间和等与药芯焊丝工艺性紧密相联的4个特征信息.然后,采用主成分分析法确定药芯焊丝工艺性评价指数,对药芯焊丝工艺性进行定量化评价,从而为科学评价药芯焊丝工艺性提供了新方法. 相似文献
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0INTRODUCTIONMetaltransferisveryimportantprocesofweldingmetalurgy.Itafectsnotonlytheoperativeperformanceofthewire,butalsowel... 相似文献
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0 INarunIowThe manipuistbo fOr drOplet tranSfer in gde arcmetal welding is one of the essential taSks of theweimng pe and qedty control.The researh ofthat in MIG wdding, opedaUy in Pulse MIGwetalng, has been paid a great attentbo to fOr its gndwelding qedty and flekible apPlication in maerialsand OPerting POStion. The dmplet transferrnanipulation is generally carried out by adusting theennyy Pararneters to contro the PrOCdure of eachdroplet from the breindng Of its grOwth to the end… 相似文献
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Han GuomingHe YuYun ShaohuiLi JunyueSchool of Materials Sdenceand Engineering Tianjin University Tranjin China 《机械工程学报(英文版)》2004,17(3):319-322
In order to recognize various metal transfer modes, by the creation of a pattern recognition system for metal transfer mode, five kinds of spectrum signal in gas metal arc welding (MIG, MAG and CO2) are collected and taken as training samples. These samples are pretreated by computer. Several key characteristic parameters of the spectrum signal are creatively extracted, and a corresponding recognition function and a minimum-distance-classifier are constructed. The results show that using this method, the pattern recognition of several kinds of metal transfer mode for the metal gas arc welding can be done successfully. It has good accuracy and recognition precision, basis for controlling the metal gas arc welding metal transfer automatically, and relative important parameters in welding process, such as the frequency of droplet transfer and the approximate diameter of each droplet, can also be obtained. 相似文献
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脉冲MIG焊熔滴过渡光谱控制法的研究 总被引:8,自引:1,他引:7
在有关电弧光谱信息研究的基础上,提出并成功地实现了脉冲MIG焊熔滴过渡的光谱控制法。它是一种物理状态控制法。试验表明:当峰值电流、基值电流、脉冲频率等焊接参数改变时,本方法均能保 持熔滴过渡为1峰0基的过渡。它具有精确控制熔滴过渡的能力,能更好地得到稳定的焊接过程和焊接质量。它还具 有抗干扰能力强、工艺适应性好、在线调节方便等一系列优点,并可期望用于2峰0基、3峰0基等的控制中,有很大的 发展潜力,为脉冲MIG焊过程和质量的自动控制提供了一个崭新的方法,是电弧光谱信息应用的新的重要发展。 试验还表明,光谱峰后切换法是实现1峰0基的最佳控制策略。论述了该方法的控制系统、原理、控制策略、焊接参数、 试验结果与分析等。 相似文献
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CHARACTERISTICS OF DROPLET TRANSFER IN CO2 LASER-MIG HYBRID WELDING WITH SHORT-CIRCUITING MODE 总被引:1,自引:0,他引:1
LEI Zhenglong CHEN Yanbin LI Liqun WU Lin State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin China 《机械工程学报(英文版)》2006,19(2):172-175
LF6 aluminum alloy plates with 4.5 mm thickness are welded in this experiment.Welding is carried out by using the CO2 laser-MIG paraxial hybrid welding in flat position. The experimental results indicate that the inherent droplet transfer cycle time of conventional MIG arc is changed due to the interaction between CO2 laser beam and MIG arc in the short-circuiting mode of laser-MIG hybrid welding. Because of the preheating action of CO2 laser to electrode and base material, the droplet transfer frequency of MIG arc is increased in the hybrid welding process. When laser power is increased to a certain degree, the droplet transfer frequency is decreased due to the effect of laser-induced keyhole. Furthermore, through analyzing the MIG welding current and arc voltage waveforms and the characteristics of droplet transfer in the hybrid welding process, the effect of laser energy and the action point between laser beam and arc on the frequency of droplet transfer and weld appearance is investigated in details. 相似文献
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Liu Haiyun Li Zhuoxin Shi Yaowu College of Material Science Engineering Beijing University of Technology Beijing China 《机械工程学报(英文版)》2005,18(1):109-111
A high-speed photographic method is mainly used to analyze metal transfer of a cellulose covered electrode in the vertical down welding. The experimental results show that fine droplets spraying transfer and globular transfer are the dominant transfer characteristic. The large droplet spatter, especially the upwards spatter, is a particular phenomenon. It is found that the combination action of gas blow force, surface tension, gravitational force and electromagnetic force lead to globular transfer. Gravitational force and electromagnetic force, which hasten big droplet spatter, should not be neglected. 相似文献