panasoniccz
proportions of welded joints have been standardized. preferred sizes, dimensions ,and charts 焊缝的比例已经标准化。用于计算焊缝所需的焊接材料的强度及用量for calculating the strengths of and amounts of filler metal required for welded joints are given in reference texts and handbooks的最佳的大小，尺寸及外观已经在参考资料及手册中给出。4.the base metal母材5.polarity switch极性转换6.not shortness非短缺7.slag inlusion夹渣8.positional welding 定位焊9.the welding zone焊接区13.types of welds焊接类型15.the ground clamp cable地线夹16the weldability of metals材料的可焊接性
dp73732849
To analyze tungsten electrode argon arc welding (GTAW) arc welding arc under the effect of applied longitudinal magnetic field behavior, based on the dc tungsten electrode argon arc welding arc as the research object, according to the theory of magnetohydrodynamics is established based on free burning GTAW arc welding under the effect of applied longitudinal magnetic field of the fluid flow and heat transfer process of the three-dimensional transient numerical model, all programs are written in FORTRAN language. 首先，分析外加纵向磁场的分布规律，建立励磁线圈磁感应强度计算数学模型，并对基本方程中的瑕点进行处理，在数值计算时采用稳定性好，计算精度高，误差容易控制的龙贝格积分法。 First of all, analysis of the applied longitudinal magnetic field distribution, excitation coil magnetic induction strength calculation mathematical model is established, and the imperfections in the basic equations, the numerical calculation with good stability, high calculation precision, the error is easy to control the dragon berg integral method. 该数学模型和数值计算方法具有模型简单，计算精度高和计算速度快等特点。 The mathematical model and numerical calculation method is simple, high calculation precision and calculation speed, etc. 在外加纵向磁场分析和计算的基础上，建立了电弧空间内带电粒子运动速度和位移的三维数学模型。 In the applied longitudinal magnetic field on the basis of analysis and calculation, established the arc space charged particle movement speed and displacement of three dimensional mathematical model. 根据牛顿运动定律，麦克斯韦方程给出了控制方程组和边界条件，模拟了GTAW焊接过程中外加纵向磁场作用条件下电弧空间内带电粒子运动行为动态变化过程。 According to Newton's laws of motion, maxwell equations governing equations and boundary conditions are given, GTAW welding process was simulated with longitudinal magnetic field effect under the condition of arc space charged particle motion behavior dynamic change process. 为深入研究外加纵向磁场作用下GTAW焊电弧动态行为数值模拟提供了前提和基础。 For further research and longitudinal magnetic field under the action of GTAW welding arc dynamic behavior simulation provides the premise and foundation. 根据质量守恒定律、动量守恒定律、能量守恒定律以及麦克斯韦方程，建立了描述外加磁场作用下GTAW焊接电弧传热传质过程的控制微分方程组，并给出了相应的边界条件和初始条件。 According to the law of mass conservation, momentum conservation law, the law of conservation of energy and maxwell's equations, established the description and magnetic field under the action of heat and mass transfer process of GTAW welding arc control system of differential equations, and gives the corresponding boundary conditions and initial conditions. 采用分离变量法成功地处理了电场、磁场、流场和热场的耦合问题。 Using the separation variable method successfully deal with the electric field, magnetic field, flow field and thermal field coupling problems. 利用所建立的数值模型，对外加纵向磁场下镁合金GTAW焊电弧的动态行为进行了数值分析。 Using the established numerical model of magnesium alloy under the applied longitudinal magnetic field GTAW welding arc dynamic behavior to carry on the numerical analysis. 以无外加磁场作用下电弧形态为参考，研究了外加纵向磁场及主要焊接参数对电弧电场、电流密度、温度分布、电弧电压及等离子流速分布的影响。 With no additional magnetic field under the action of arc shape for reference, studies the applied longitudinal magnetic field and the main welding parameters on arc electric field and current density, temperature distribution, the influence of arc voltage and the plasma velocity distribution. 得到了外加纵向磁场作用下GTAW焊电弧动态行为的变化规律。 Got the applied longitudinal magnetic field under the action of GTAW welding arc dynamic change rules of behavior.
