【作者】 祁贵云；

【导师】 殷树言；

【作者基本信息】 北京工业大学 ， 材料加工工程， 2004， 硕士

【摘要】 摘 要 随着焊接技术在工业生产中的广泛应用，各生产厂家为了增强市场竞争力，越来越强烈要求降低成本，提高焊接生产效率。因此，高效、低成本的焊接方法已经成为焊接工作者研究的热点。而采用外加磁场控制焊接过程，具有附加装置简单、投入成本低、耗能少等特点，引起焊接工作者的重视。 本文通过对电弧的特点进行深入研究，利用带电粒子在磁场中运动的理论，建立了磁场作用下电弧的稳态模型和电弧的动态模型，分析了磁场作用下电弧的运动行为和运动机制，对磁场作用下电弧的运动过程进行了数学描述，为研究旋转磁场作用下电弧特性和电弧的运动行为提供了坚实的理论基础。 采用 ANSYS 有限元分析的方法，对各种情况下磁场的分布情况进行了仿真和计算。分析了励磁线圈的形状、位置、励磁电流的大小、铁芯大小和导磁杆角度的变化等诸多因素对磁场分布的影响。为选择和设计科学、合理的外加旋转磁场发生装置提供了理论上的支持。 在上述理论分析和计算基础上，建立了一套旋转磁场作用下电弧特性和电弧运动行为研究的实验系统。主要包括性能优良的焊接电源，成本低廉的保护气体和简单实用、灵活方便的旋转磁场发生装置。在上述实验系统的基础上，通过大量的实验，证明了外加旋转磁场对 TIG 电弧的控制作用，并且得到了外加旋转磁场作用下电弧静特性和电弧运动行为的变化规律。为实现旋转磁场作用下MIG/MAG 新工艺奠定一定的理论基础。更多还原

【Abstract】 With the application of the welding process in the industry, in order to strengthentheir competition, manufacturers scream for the less cost and higher efficiencywelding process. As a result, the high efficient and low-cost welding process has beenthe researching focus for the welding researcher. To control the welding process withadditional magnetic field has many advantages such as its affixture equip is simple,the cost is low, and it consumes little energy etc. All of these causes the weldingresearcher’s extensive interest. Through the research for the characteristic of the arc and with the theory abouthow the charged particles move in the magnetic filed, the static and dynamic modelare established in this paper. Also, in this paper, we analyse the motion and itsmechanism of the magnetic control arc, and describes it in math. They lay a solidfoundation to research the characteristic of arc and its movement behavior underrotating magnetic. Based on the finite element software of ANSYS, the distribution of the magneticfield is simulated. The factors which affect the distribution of the magnetic field arediscussed, such as the shape and the location of the excitation coil, the value of theexcitation current, the size of iron core and the change of the conduct magnetic pole’sangle etc. They provide the theoretic support to choice and design the occurrenceequip scientific. Based on the theoretic analysis and simulation, the experiment system for theresearch of the characteristic and movement behavior of welding arc under rotatingmagnetic field is established, including the good performance power source, the lesscost common shielding gas and the simply, practical and portable occurrence equip ofrotating magnetic field. Based on these experiment systems, it proves that the rotatingmagnetic filed does control the TIC arc, and the variety law of the static characteristicof the rotating magnetic control welding arc and movement behavior of welding arcare also gotten through the great quantity experiments. They lay a theoretic foundationto realize the new technique of the revolving magnetic control MIG/MAG.This work is financially supported by the National Natural Science FoundationProject(No. 50205001).更多还原