电弧

In light of the characteristics of non-linearity,heavy lag behind,strong coupling, time change, heavy working environmental interference as well as stochastic disturbance and according to the self-adapting control theory the control device with PLC as its core element is used to realize the automatic and accurate control on the lift-up and fall-down of the electrode of electric arc furnace.

针对电弧炉的非线性、大滞后、强耦合、时变、工作环境及随机干扰较强的特点，应用自适应控制理论，采用PLC为核心控制部件，来实现电弧炉电极升降的自动准确地控制。

Based on self-made stepping arc stud welding gun, the welding process adopting ferrules as arc shield was studied.

利用自行研制的步进式电弧螺柱焊枪，采用套圈作为焊接过程的保护方式，研究了套圈保护步进式电弧螺柱焊过程。

In hardware design, high frame rate CCD and straight fiberscope are used as the sensor of image, a advanced system of testing high speed arc image and high speed data transfer with RS-422A have also been designed.

硬件设计中利用高帧频CCD和直管纤维镜做图象传感，设计出先进的电弧图象高速成象和RS-422A数据传输系统，将电弧光学图象转化为便于计算机处理的数字化图象。

The main reason of decreasing of AC pollution flashover voltage with the dropping of pressure on the simple plane model is the reducing of the requirement of AC arc to develop under low pressure.

由于气压对于交流电弧发展条件的影响程度大于气压对于直流电弧伏安特性的影响，使得低气压下交流污闪电压的下降指数大于直流污闪电压的下降指数。

Modeling results concerning a free-burning argon arc are presented in thispaper. The calculation domain includes the arc itself and the electrodes.

本文对自由燃烧电弧中传热与流动进行了数值模拟，计算域除包括电弧本身外，还包括阴极与阳极。

Based on theoretic deduce and summarizing of application experience, themost effective method for the electric arc furnace hot metal charging and oxygen jetprocess is presented, and it is suggested to be the production guide.

针对电弧炉铁水热装的生产，通过理论推断和实际操作经验的总结分析，归纳出电弧炉铁水热装用氧工艺的最行之有效的方案，用以指导生产

The arc furnace electrode regulator is the electric furnace core control system.

电弧炉电极调节器是电炉核心控制系统，它通过控制电极的高度来控制电弧电流，起到提高电炉冶炼效率和保护设备的作用。

Effects of arc welding processes,welding parameters as well as chemical compositions and mechanical properties of the base metal on arc efficiency ,melting efficiency and heat input for fusion welding processes are analyzed.

介绍了电弧焊过程热效率的物理含义及熔焊过程热效率的研究概况，比较了不同熔焊过程的热效率，分析了焊接方法、焊接参数及母材成分与性能对熔焊过程的电弧热效率、熔化效率及焊接热输入的影响规律。

Welding completed, should be removed arc OFC boards and grinding formation, while the hammer down; Slag : After removal of the entire weld slag, welders self including weld appearance and size, etc.

焊条应与垂直面形成60°～80°角，使电弧略向上，吹向熔池中心；收弧：当焊到末尾，采用排弧法将弧坑填满，把电弧移至熔池中央停弧。严禁使弧坑甩在一边。

The results show that laser-arc welding can achieve full penetration by single-path butt jointing through appropriate parameters; Y shape groove with 8 mm truncated edge can enhance the penetration ability of laser-arc hybrid welding. Low welding speed is good for penetration, however the limitation still exists for hick plates joint. Gap is significant factor of penetration when work pieces is large thickness. The hardness of thick plates joint shows that there is big difference in mold of vertical thermal cycle using laser-arc hybrid welding.

结果表明：通过激光功率等焊接规范匹配，激光-电弧复合焊接能实现20 mm厚板的全熔透单道对接；钝边为8 mm的Y形坡口有助于提高厚板激光-电弧复合焊缝熔透能力；降低焊接速度有利于提高熔深能力；工件厚度较大时，装配间隙对焊缝熔深能力的影响较为显著；接头硬度表明厚板激光复合焊焊缝纵向热循环模式存在较大差异。

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。