共查询到19条相似文献,搜索用时 656 毫秒
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一九八六年成都电焊机研究所的科研工作在围绕节能、通用、提高焊接质量、靠国际标准方面取得了以下五项科研成果。其中前三项分别属于国家经委、机械部下达的科研课题。以上五项成果已于1986年底以前分别完成部级、所级鉴定。 1、气体保护焊电流波形及相应晶体管电源研究为提高常规二氧化碳短路过渡焊接时的熔滴过渡频率、电弧稳定性,减少飞溅,改善焊缝成型和焊丝熔化效率而开展了该科研项目。该项目分焊接工艺(电流波形)研究及相应晶体管电源研制两部分内容。工艺部分研究脉冲短路过渡焊接法:研究了具有陡升陡降的单脉冲短路电流波形、可调节燃弧电流值的脉冲短路电流波形显著低于燃弧值的脉冲短路电流波形等三类电流波形的实现方法、特点和工艺性能。研究表明,合理地控制脉冲短路过渡电流波形,改变燃弧期的 相似文献
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研究了在短路过渡、单脉冲和双脉冲焊接模式下的DP590GA镀锌钢板熔化极气体保护焊搭接接头的气孔敏感性。采用X射线无损检测方法统计分析了不同模式下焊缝中气孔的数量、分布及气孔形貌,同时结合不同模式下的焊接电流电压信号,分析了不同模式下气孔产生的原因。试验结果表明,无脉冲和单脉冲焊接时气孔数量较多,无脉冲时焊缝中的气孔形状近似为椭球形,单脉冲则呈球形,而在双脉冲模式下获得的焊缝中只有在起焊处有少量气孔存在;采用双脉冲焊接模式对DP590GA镀锌钢板进行搭接焊可以降低气孔敏感性从而得到满意的焊缝质量。 相似文献
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为优化双丝脉冲MIG焊的焊缝成形质量,提出双丝脉冲MIG焊的双脉冲焊接方法,构建基于DSP的双丝脉冲MIG焊的双脉冲数字化交替相位协同控制系统,对双丝脉冲MIG焊的单脉冲和双脉冲焊接进行平板堆焊试验.结果表明,双丝脉冲MIG焊双脉冲焊接系统实现了稳定的双脉冲焊接过程,焊缝成形良好.对单脉冲和双脉冲焊接所得焊缝的横截面宏观金相对比分析结果表明,双脉冲对焊接熔池有很强的搅拌作用,双脉冲焊接所得焊缝晶粒比单脉冲焊缝晶粒更小,说明双脉冲具有细化晶粒的效果,证明在双丝脉冲MIG焊中应用双脉冲有一定的优化作用. 相似文献
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研究单、双脉冲MIG焊工艺对LD10CS高强铝合金焊接接头组织及力学性能的影响。实验结果表明,单脉冲MIG焊时,焊缝成形较差,焊接变形量大;而双脉冲MIG焊时,焊缝表面呈现清晰的鱼鳞纹状、焊接变形明显减小。双脉冲MIG焊与单脉冲MIG焊相比,焊缝组织明显细化,焊接接头的力学性能得到提高。 相似文献
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为提升双脉冲MIG焊接设备的整体性能,研制了一台基于全碳化硅功率器件的双脉冲MIG逆变焊接电源,逆变频率可达100 kHz,有利于实现电弧的精细化控制.以STM32F405RGT6为控制核心,搭建了逆变焊机的控制系统硬件电路,其由主控制电路、数字面板以及送丝控制电路等构成.根据双脉冲MIG焊的任务需求设计了相应的控制软件,采用增量式PID算法控制输出量,通过单脉冲输出+脉动送丝控制,实现双脉冲焊接.结果表明,所研制的逆变焊接电源具有快速的动态响应,能有效配合脉动送丝进行焊接,焊缝鱼鳞纹清晰,无明显缺陷. 相似文献
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Régis Henrique Gonçalves Silva Jair Carlos Dutra Raul Gohr Jr. 《Welding International》2013,27(2):141-149
The second part of this series deals with the metal transfer modes of most interest to the MIG/MAG process, regarding the development of the controlled short-circuiting MIG/MAG welding process (CCC). The primary intention is to study pulsed arc and short-circuiting arc welding, both of which are the basis for the CCC. Also in relation to the metal transfer dynamics, the drop formation and the forces acting on it are reviewed. To provide a more complete understanding, aspects regarding shielding gases are described, including economic issues. Since they are important characteristics for any weld, information concerning short-circuiting MIG/MAG welding penetration and heat input are also provided. 相似文献
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高效MIG/MAG焊的研究与发展 总被引:1,自引:0,他引:1
近年来高效化MIG/MAG焊技术受到了焊接工作者的广泛重视,进一步提高焊接效率以满足现代制造业发展的要求是焊接技术的发展趋势之一,因此开展高效化焊接技术的研究具有重要的意义.介绍了国内外高效MIG/MAG焊方法的发展现状,分析了高效MIG/MAG焊时易发生的缺陷及产生原因,论述了Twin及Tandem双丝MIG/MAG焊、DE-GMA焊、激光-MIG复合焊、T.I.M.E焊、磁控大电流MAG焊等高效化MIC/MAG焊方法的结构、原理和特点,指出了高效MIG/MAG焊接技术的发展方向. 相似文献
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Andre Alves de Resende Valtair Antonio Ferraresi Americo Scotti Jair Carlos Dutra 《Welding International》2013,27(12):910-916
One of the versions of the plasma–metal inert gas (MIG) process is basically a combination of a plasma arc with a MIG/metal active gas (MAG) arc in a single torch. With this association, the advantages of each arc are combined. The main characteristic of this is the independence between the heat input by the process and the deposited material, resulting in greater facility to control bead weld geometry. In the current literature, there is a shortage of information related to the process, and most of this goes back to the 1970s and 1980s when the technology available was not able to make the process viable for industry. However, in recent years, the use of the diffusion of new electronic power sources used in welding has sparked up again the interest in plasma–MIG process. In this context, this paper aims to contribute to the studies related to the influence of the MIG and plasma current balance on the geometry of the bead weld and wire fusion rate. Bead-on-plate welds were carried out with plasma and MIG/MAG current combinations at three levels each, keeping, by welding speed corrections, the bead volume the same. It was observed that the introduction of the plasma current over the MIG/MAG current reduces penetration and dilution and leads to convex beads. On the other hand, the use of plasma current increases the MIG/MAG wire fusion rate. However, it seems that the intensity of the plasma current is not the governing parameter of those changes. 相似文献
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