电弧

It was found recently that magnetic arc blow, inherently happens with such kind of welding process, particularly in deep groove welding of the first layer, can produce various kinds of weld defects, interfere the welding operation and make the arc length control system to work unproperly.

近年来在MIG焊研究中发现电弧磁偏吹现象严重，特别是坡口对接封底焊，会造成多种焊缝缺陷，甚至无法进行焊接，还会造成弧长闭环控制系统混乱。

A detection method for welding lines based on K-L algorithm is discussed. Infrared light source is applied to get high quality images of welding lines through CCD. Image template libraries for unwelded and welded lines are constructed and the welding line image is processed by K-L algorithm to match with the template libraries to judge if the welding line has been welded. The experiment shows that above method is effective with high precision and speed and it can be applied on real-time detection of welding lines.

提出计算机对所得图像进行滤波和图像分割，讨论了K-L算法的原理及其在红外焊缝图像检测中的应用；以红外光源照射焊缝，通过CCD摄取焊缝的图像，建立已焊和未焊的图像模板库，采用K-L算法对焊缝图像进行处理，并与模板库进行比较，得出焊缝是否焊接的结论；试验结果表明，该方法检测精度高，检测速度快，可以实时运用于对手工电弧焊的焊缝质量检测中。

Cutting current upslope can be adjusted to prevent damages of nozzle electrode by inrush current on arc striking extend its usage time.

有电弧同步信号及弧压信号输出接口，便于自动切割的运动控制，特别适合与数控机床及机器人配套使用

It is prepared by the steps: using vacuum machine set to vacuumize the reaction chamber, then charging protective gas to generate electric arc between moving electrode and metal Pb, and quickly condenses Pb steam to deposit Pb powder in powder collector.

本发明所述的铅粉按以下步骤制得，用真空机组对反应室抽真空，再充入保护气体，在运动电极与金属铅之间产生电弧，对铅蒸气快速冷凝，沉降至收粉器中。

This talk presents the PhD research done by YuChi Liu at the University of Kentucky Welding Research Laboratory on the control of a novel arc welding process which has been referred to as the quasi-keyhole process.

这个报告主要介绍肯塔基大学焊接过程研究实验室在控制一种称为准小孔的新型电弧焊过程方面所从事的博士论文研究。

Adopting cathode protection of the zinc materials as an effective protection method, which already applied more and more in many field. For example, Hot-dip galvanisation, galvanization, electric arc spray zinc 、sherardizing, etc. But that method are with lots of shortcomings. For example, hard to apply

采用锌材料阴极防护的方式，作为一种有效的钢铁防护手段，已经得到越来越多的应用，诸如热浸镀锌、电镀锌、电弧喷锌、热喷锌等工艺手段，但鉴于这些工艺存在施工难度大、环境污染重、能耗高、锌层受损难修复等弊端，使得发展受限。

The arc is usually started by HF sparks which ionise the gap between the electrode and the workpiece.

电弧通常由高频火花电离电极和工件的间隙产生。

The power of its electronic transgression is 2.7ev, 40% less than that of pure tungsten electrode. With a low arc derivation voltage. It's easy to cause arc of high stability. Its current capacity is elevated 30% while its rate of burn spoilage drops low, making it more durable.

电子逸出功约2.7ev，比纯钨低40%，引弧电压低，易起弧，电弧稳定，载流能力提高30%，烧损率低，寿命延长。

Ablation-controlled arcs compensated by materials being ablated from the capillary wall are of great interest.

通过衬套材料消融补充等离子体从而控制电弧生长的技术具有很好的应用前景。

The numerical results are compared with experiment results, it is verified that contribution of the ablated nozzle materials to the over-rise of pressure in pressure chamber can not be neglected. The model which takes the ablation effect into account is proved to be valid.

通过将考虑和不考虑烧蚀效应的数学模型数值计算所得的计算结果与试验结果相对比，说明了喷口烧蚀对上游压力升高的贡献不可忽略，并验证了考虑烧蚀效应电弧数学模型的正确性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。