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Pure tungsten also provides good arc stability for AC sine wave welding, especially on aluminum and magnesium, but is not typically used for DC welding (it does not provide as strong of arc starts as thoriated or ceriated electrodes).

纯钨还提供良好的交流正弦波焊接电弧稳定，特别是对铝、镁、但并不是一般用于直流焊接(不提供强劲电弧或开始为thoriatedceriated电极)。

The cold state modelling test and theoretical analysis for arc tangent tertiary air determined the arc tangent degree of tertiary air.

对三次风反切进行冷态模化试验和理论分析，确定了三次风反切角度。

R1 o R1 Construct principle: The key in tangency principle is to find the center of the arc and the tangent position of the corresponding lines, line and arc, and arcs respectively.

作图原理圆弧连接作图的关键在于，找出连接弧的圆心位置及与两被连接线段连接处的切点位置。

Applying theories of numerical analysis and higher geometry, the corresponding mathematical model of stem line is established according to different stems. Whereby, the centers, radii of the arc and its tangent points with the water-line can be found and the curve of arc radius is thus determined. A general formula for expressing stem curved surface is introduced.

应用数值分析和计算几何理论，根据船体首部线型特点，建立首柱轮廓线数学模型；计算水线首圆弧圆心、半径和切点，确定首圆弧半径线；给出首部曲面的通用方程式。

All these results lay a foundation for the improvement of arc welding technology and arc waveform control.

分析结果可为改进焊接工艺和波形控制方法提供依据。

Products are mainly used for arc welding, argon arc welding and other fields.

产品主要用于电弧焊、氩弧焊等领域。

The induction periods and particulate fouling asymptotic resistances of arc line tube were obtained by comparative experiment under various particulate concentration and liquid velocity. The flow field and shear stress in the arc line tube were numerically simulated and analyzed.

文中通过不同流速和微粒浓度下微粒污垢的加速实验，得到了弧线管微粒污垢渐近热阻值和诱导期；同时，用数值方法模拟了弧线管的内部流场和壁面剪切力。

This paper analyzes the characteristic of the Power Factor Correction of arc welding inverter power source , introduces the 12-pulse converter based on delta-type autotransformer connection into arc welding inverter power source ,and its configuration, design scheme and theory on PFC.

分析了弧焊逆变电源功率因数校正技术的特点，阐述了弧焊逆变电源中基于差接三角形自耦变压器十二脉波整流电路的原理与设计及其功率因数校正机理。

In this paper,a study is given to the relationship between vacuum arc current and axial magnetic field keeping the vacuum arc diffuse,a formula of the relationship is deduced.

本文研究了真空电弧与使其保持扩散型的纵向磁场间的关系，并得出了电弧电流与纵向磁场间的关系式。

According to the electric field intensity,arc current,combining bidimensional heat transfer model,the neutral particle temprature,arc section area and non-equilibrium degree of plasma were calculated and compared with our work.

对实验结果进行了分析和处理，根据测量的电弧电场强度、电弧电流，模拟了中性粒子温度、电弧截面面积和等离子体非平衡度的关系式，与实验结果相符。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。