共查询到19条相似文献,搜索用时 203 毫秒
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电弧磁偏吹的产生及控制 总被引:6,自引:0,他引:6
阐述了电弧磁偏吹产生的原因及影响磁偏吹大小的因素, 介绍了磁偏吹对焊接质量的影响。从设计和使用方面提出了控制磁偏吹的方法及注意事项,对指导焊接生产,提高焊接质量具有实际意义。 相似文献
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交流方波埋孤焊具有电孤稳定、无磁偏吹、焊接熔敷率高等优点,是埋孤焊技术发展的一个新方向。提出了一种三相输入、单相输出交流方波埋弧焊电源的新电路,详细分析了这种晶闸管整流、互感换向实现交流方波电路的工作原理和控制方法。实验结果表明,利用互感换向实现交流方波的埋孤焊电源,其电流过零的di/dt很大,电孤稳定性不亚于直流电孤。 相似文献
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工频方波交流弧焊电源,随着SCR—IC控制技术的发展,国外已形成产品。本文作者研制的FJD—160型工频方波交流弧焊电源,实现交流和直流输出,可用作交流TIG焊或采用碱性焊条施焊,获得电弧稳定,无磁偏吹,飞溅小等优点。文内着重讨论了工频方波交流弧焊电源中,有关方波的获得、恒流特性的形成、总电流、电流比的调节,以及电感量对最小连续电感电流、波形系数和电流比(β)调节范围的影响等。 相似文献
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直流熔化极焊接中的电弧磁偏吹行为探讨 总被引:3,自引:0,他引:3
直流熔化极焊接中的电弧磁偏吹行为探讨李萌盛合肥工业大学(安徽合肥230009)1电弧磁偏吹现象的观察生产中可以观察到下列现象:(1)在圆柱形筒体纵缝焊接过程中,偏吹发生在纵缝两端,尤其在终端较为明显。起弧时,电弧偏吹方向与焊接方向相同。在筒体中间部位... 相似文献
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本文介绍了一种新型方波交流焊接电源,其主回路是由普通直流焊接电源和可控硅逆变器组成.该逆变器将直流转变为方波交流.直流电源的空载电压为70V,不需要特殊措施,即可保持每次电流过零后的稳定再引燃,可使10A以上的交流电弧稳定燃烧.电流的交变频率,正负半波的通电时间比,正负半波的电流比值皆可在一定范围内自由调节。工艺试验证明,利用这种电源进行铝合金钨极氩弧焊时,可控制雾化区的宽度,调节工件上的线能量,提高钨极的寿命,可以更有效地利用电弧热和力的作用来满足某些焊接工艺的特殊需要.这种电源也可满意地用来进行碱性焊条的手工焊,电弧稳定并可避免磁偏吹现象. 相似文献
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微机控制多功能IGBT逆变焊机的研制 总被引:3,自引:0,他引:3
详述了自行开发研制的微机控制IGBT的多功能逆变焊机的原理和电路结构,主电路采用双逆变技术,前级采用半桥式逆变电路,后级采用全桥式逆变电路。以80C552单片机为控制系统的核心,简化了控制电路,利于安装调试。通过对一系列功能转换器件的电流和电压的波形测试和分析,证明了该焊机硬件电路设计合理,软件程序运行无误,规范参数调节灵活,可靠性大幅度提高,能够满足直接手弧焊/TIG焊,直流脉冲焊,交流方波手弧焊/TIG焊和变极性交流方波TIG焊等多种焊接方法的需要,实现了一机多用的功能。 相似文献
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Summary Previous papers have shown the high‐current AC‐MIG welding process to be superior to the conventional DC‐MIG process in terms of welding efficiency and welded joint performance. The authors have used the AC‐MIG process to weld heavy‐gauge steel plates at a tensile strength level of 980 MPa. Weld metal with a very low hydrogen content is obtained by the newly developed process, resulting in a reduced preheating temperature during welding of high‐strength steels. The AC‐MIG process also produces an arc climbing effect with electrode negative polarity ‐ a desirable effect in narrow‐gap welding. AC‐MIG weld metal further contains low oxygen, conferring high toughness. As a result, a narrow‐gap AC‐MIG welding process has been developed to ensure high efficiency in processing and metallurgically high‐quality welds in welding of 980 MPa high‐strength steels for penstocks (pressure shafts) in hydroelectric power stations. Welding wires with chemical compositions satisfying suitable strength and toughness criteria have been trial‐manufactured. Suitable welding parameters have also been determined for narrow‐gap welding of penstocks. 相似文献
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Arc stability in AC/DC pulsed MIG welding is mostly determined by the performance of the arc length control system. This system detects the arc voltage as arc length information for feedback purposes and varies the output of the welding power source so that the arc voltage is equal to the voltage set point. For example, at a high arc length, the arc voltage increases. The pulse frequency is reduced in response, the wire melting rate is reduced and the arc length is returned to normal. 相似文献
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Pulsed MIG welding is suitable for aluminum alloys welding, because spray transfer and excellent profile can be arrived during whole welding current range, and the energy of droplet can be controlled to overcome losing of alloy elements with lower melting and steam point by controlling pulse current and pulse time. Because of the special physic properties of aluminum alloys, there are different requirements for pulsed MIG welding between starting arc short circuit and drop transfer short circuit, pulse period and base period. In order to satisfy the need of aluminum alloys MIG welding, self-adjusting dynamic characteristics are designed to output different dynamic characteristics in different welding startes. The self-adjusting dynamic characteristics of pulsed MIG welding are achieved through a short circuit controller and a dynamic electronic inductor. The welding machine(AL-MIG 350) with self-adjusting dynamic characteristics has a high rate of successfully starting arc up to 96%, and the short circuit time during transfer is less than 1ms, in the mean time, the arc is stiffness, spatter is low and weld appearance is good. 相似文献
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铝合金AC—P—MIG焊丝熔化速度主要受焊接电流、BEN比率的影响,在相同BEN比率下,焊丝熔化速度随焊接电流的增大而增大;在相同电流下,焊丝熔化速度随着EN比率的增大而增大.由于阴阳极等效压降的不同及电弧形态特征的差异,随着BEN比率的增加,焊丝得到更有效、更多能量的加热,故熔化速度加快.在同样送丝速度与焊接速度下,随着BEN比率的增加,焊接电流减小,熔深、熔宽减小,余高显著增大.因此AC-P—MIG可以有效解决薄板焊接易烧穿问题,并且可以提高搭接间隙范围,实现薄板的高速、高质量焊接. 相似文献