电弧

A stepper motor is taken as driver gear and a screw-driven device as running gear in the gun to realize the stud action procedure requested by arc stud welding

焊枪的机械结构部分以步进电机为动力机构，以螺旋传动装置为运动机构主体，实现了电弧螺柱焊所需的螺柱运动过程

Iron-based composite coatings were deposited on mild steel substrate by arc spraying cored wire with WC-CoNi ceramic powders. The abrasion wear properties were evaluated using a examined MLS-225 wet sand/rubber wheel tester. The microstructure, phase compositions and worn surface of the coatings were examined by means of optical, scanning electron microscopy and X-ray diffraction.

采用电弧喷涂含WC-CoNi金属陶瓷粉末的粉芯丝材，在低碳钢基体上制备铁基复合涂层，采用MLS-225型湿砂橡胶轮磨损试验机评价铁基复合涂层的耐磨粒磨损性能，利用光学显微镜、扫描电子显微镜和X射线衍射仪对涂层的显微组织结构、磨损表面及其相组成进行分析。

An automatic arc welding machine for saddle joint seam on large diameter cylinders was designed and its structure,components,characteristic and working principle were discribed in this paper.

介绍了大直径筒体马鞍形接缝自动焊机的结构和工作原理，以及设计的主要特点。推导出了该系统用来控制气体保护电弧焊焊枪运动轨迹的关键部件──凸轮的形状与尺寸的计算公式：l =l′-Z′=l′- [(R2 -r2 cos2 ψ) 1/ 2 -rsinψcosα]/sinα。

Vacuum Interrupter;Axial Magnetic Field;Arc Voltage;Melting Pool Rotation

真空灭弧室；纵向磁场；电弧电压；熔池旋转

This was electric blue—boiling plasma blue.

而这个是电弧蓝――沸腾的等离子蓝。

The lead-in voltage and out-of-line voltage of switchbox are detected and converted into frequency signal. The arc voltage signal can be obtained by measuring the two signals. The arc voltage signal and arc light intensity signal are sent to the advanced single-chip microcom puter, PIC16F877, to do synthetic analysis – judgment.

提取配电箱的进线电压和出线电压，分别转换成频率信号进行比较，获得电弧电压信号，并将其和弧光信号一起送入性能先进的PIC16F877单片机，做综合分析判断。

Gray castiron works may be repaired by arc welding with electrodes of 08 or ordinary iron wire covered with special coating which contains ferro-aluminium and other graphilizers. During welding process, it is found that these electrodes produce a weld of gray cast iron structure.

灰鋳铁铸件可以用08焊丝或普通鉄丝复以含有铝铁及其他石墨化剂的特种药皮的焊条电弧焊补，在焊接过程中，这种焊条形成灰铸铁组織的焊縫。

Arcjet, one type of electric propulsion, is high at specific impulse and ratio of thrust, and good in capability of propellant. Thus it is being researched and applied in several countries.

电弧加热发动机就是电推进的一种，它具有较高的比冲和推力/功率比以及良好的推进剂普适性，已成为国际研究和应用的重点。

This new refining process is termed "ladle-refining" or "secondary steelmaking". It is discussed in three parts: The development of various ladle-refining process including vacuum refining and normal pressure refining such as synthetic slag treatment, argon stirring, vacuum degassing VC, SLD,...

本文分三个方面进行讨论：(1)各种炉外精炼法的发展，包括真空精炼和常压精炼，例如合成渣洗、吹氩搅拌(Gazal、CAB、SAB法)、真空脱气(VC、SLD、TD、TD-VC、TD-SLD、RH、DH、FinKl和Gazid法)、带电弧加热的炉外精炼(ASEA-SKF、FinKl-VAD和LF法)、喷射冶金以及不锈钢的精炼法(AOD、CLU、VOD、SS-VOD、KVOD/VAD、RH-OB和VODC法)，(2)我国炉外精炼技术的现状，(3)发展炉外精炼必须注意的一些问题。

In the VR interactive interface provided by the software, a GTAW arc geometrical 'model has been constructed in two-dimensional (2D) axisymmetry through main menu. Using PHOENICS code and developing it secondly, a series of subroutines has been programmed in the Ql file and GROUND file. Boundary conditions and special sources about temperature profile .velocity and potential profile have been loaded by these subroutines.

在软件所提供的交互界面VR(Visual Reality虚拟现实)里，通过主界面菜单操作实现了在二维柱坐标下对电弧几何模型的建立，对软件进行了二次开发，在Q1和GROUND文件中编译了子程序，处理了温度场、速度场和电势场的边界条件和源项。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。