4极横向磁场再约束等离子弧切割

研究了４极横向再约束磁场的装置设计原则，通过不锈钢切割试验考察了磁场对等离子弧特性、切割质量和无渣切速的影响规律，并分析了磁装置性能和磁约束方法的局限性，指出了进一步研究全向约束磁场装置的必要性。     

4极横向磁场再约束等离子弧切割

研究了４极横向再约束磁场的装置设计原则，通过不锈钢切割试验考察了磁场对等离子弧特性、切割质量和无渣切速的影响规律，并分析了磁装置性能和磁约束方法的局限性，指出了进一步研究全向束磁场装置的必要性。     

热等离子体技术在材料成形中的应用研究

根据等离子弧的发生特点,阐述了等离子熔射成形技术和附加阳极等离子切割陶瓷的基本原理;通过快速制造零件和模具的实验,分析了等离子熔射成形件质量的主要影响因素;对水再约束、磁再约束、水一磁再约束等离子体加工进行了对比实验,研究优质、高效、快速切割陶瓷材料的新方法。研究成果对进一步拓展等离子体技术的应用领域具有重要意义。     

横向磁场约束等离子弧的研究

阐述了磁场约束等离子孤的原理，并进行了横向磁场约束等离子弧的加工试验和分析。     

横向磁场压缩等离子弧提高切割效能的试验

本文介绍了用横向磁场压缩等离子弧减少等离子弧切口宽度和提高切割速度的探讨试验。试验表明,此方法是有效的。     

真空磁压缩等离子弧焊接方法的研究

本文介绍了一种新的焊接方法——真空磁压缩等离子弧焊接。真空磁压缩等离子弧是将低真空中的自由电弧用与电极同轴向的磁场压缩后获得的。实验表明,随着气压的降低,自由电弧会越来越扩展,弧根区的电流密度越来越低,直至产生“旁弧”,不能稳定燃烧而熄灭。而且这种低真空自由电弧难以用和普通等离子弧相似的机械方法压缩。采用轴向磁场可以有效地压缩真空电弧。磁压缩的效果随气压的降低趋于明显,气压低于1.33×10~2Pa 时,几十分之一特斯拉(T)的磁场就可获得略粗于电极、上下直径近似相等的弧柱,我们称之为真空磁压缩等离子弧。使用真空磁压缩等离子弧作为热源,可以焊接一般金属和活泼金属,其熔透工件的能力可超过大气氩弧,并可用调节磁场强度的方法,调节电弧的能量分布。与常规氩弧焊、等离子孤焊、电子束焊相比,真空磁压缩等离子弧焊接有其独到的优点,可望在不久的将来获得广泛的应用。     

水再约束等离子弧加工的形式与改进

针对现有水再约束等离子弧加工中存在容易断弧等问题，提出了把水射流“焦平面”与被切割工件上表面重合的水再约束方案，并分析了该方案中再约束水流量对弧柱稳定性及切口质量的影响。     

水再压缩等离子弧加工陶瓷实验研究

为减小口宽度，提高切口质量，进行了水再压缩等离子弧切割陶瓷实验研究。内容涉及基本原理，实验装置及加工参数对弧柱特性，切口宽度，切口角，无渣切速的影响规律，结果表明，施加水再压缩对提高等离子弧柱的能量密度和稳定性，进而提高陶瓷件切割质量非常有效。     

磁控电弧焊接工艺在非熔化极气体保护焊中的应用

针对非熔化极气体保护焊,介绍了作用于焊接过程中的平行磁场、横向磁场、纵向磁场、双尖角磁场和旋转磁场的特点及磁场发生装置的组成,分析了磁偏弧工艺、磁摆弧工艺、均匀纵向磁场作用下的磁旋弧工艺、非均匀纵向磁场作用下的磁旋弧工艺、旋转磁场作用下的磁旋弧工艺、磁再压缩技术等国内外典型的磁控电弧焊接工艺的基本原理、应用范围及存在的问题.并对焊接电弧外形的变化和运行机制,焊接电弧外加磁场强度的变化关系进行了研究.     

气焊及切割工艺与设备

采用铝合金填充材料完成角缝的切割[英]；薄壁轮廓不变形的切割[德]；精密等离子弧切割装置[德]；等离子弧切割——有前途的热切割方法[俄]；厚板的高质量切割[俄]。     

Experimental study of magnetic arc blow for plasma arc cutting

Oxygen plasma arc cutting (PAC) is widely used in various industrial fields. In the case of cutting magnetized plates, the magnetic field is concentrated around the cutting front according to the progress of the cutting, and the electromagnetic force induced by leakage magnetic field deflects the plasma jet. The deflected plasma jet causes poor cutting quality and sometimes causes fatal damage on the electrode and the nozzle by a double arc as abnormal discharge. This phenomenon is called magnetic arc blow, and it is a critical issue of applying plasma cutting on magnetized plates. The purpose of this study is to investigate the arc blow behaviour and to devise a method to prevent it. We examined the relationship between operating conditions and double arc with external magnetic fields on the plasma jet. We found criteria of operation conditions that induce the arc blow. In addition, we have succeeded in suppressing the double arc generation attributed to the external magnetic field with a mild steel shield cap attachment around the nozzle tip.     

数控等离子弧切割多参数的选择与优化控制

数控等离子弧切割是一种经济、实用、高效的先进热切割技术.在数控等离子弧切割工艺参数中,许多参数相互耦合,影响切割质量与切割效率,因此,切割参数的选择及控制是一个重要的问题.通过对数控等离子弧切割的加工工艺进行分析,对等离子弧切割的空载电压、弧柱电压、切割电流、切割速度、工作介质及流量、喷嘴距工件的高度、喷孔直径、电极内...     

Relationship between plasma arc cutting acoustic and cut quality

Abstract

The tremendous acoustic signal exiting during the plasma arc cutting process includes a lot of information about this process and has a close relation with cut quality. To investigate the relationship between the plasma arc cutting acoustic and cut quality, a number of experiments have been carried out. In the present study, cut quality by plasma arc is described by top and bottom kerf widths, bevel angle, and attached dross state, and the relationship between the evaluation items for cut quality and the SPL (sound pressure level) of the cutting acoustic is investigated in detail. It is shown that the SPL reaches a maximum as the bottom kerf width equals the diameter of the plasma arc potential core. The attached dross and kerf widths in a state of free dross obviously affect the low and high frequency components of the plasma arc cutting acoustic, respectively. These results also suggest the possibility of designing an acoustic-based monitoring system for the plasma arc cutting process.     

数控等离子切割机切割质量的控制

数控等离子切割机的切割质量，主要是指切割面的倾斜度和光洁度。本文阐述了切割速度、工作气压与切割质量的关系。并根据数控切割机的特点，结合试验数据进行分析和总结，得出了不同功率切割不同厚度钢板的最佳切割参数。为提高数控等离子切割机的切割质量提供参考。     

数控等离子切割机切割质量的控制

数控等离子切割机的切割质量,主要是指切割面的倾斜度和光洁度。本文阐述了切割速度、工作气压与切割质量的关系。并根据数控切割机的特点,结合试验数据进行分析和总结,得出了不同功率切割不同厚度钢板的最佳切割参数。为提高数控等离子切割机的切割质量提供参考。     

Shape control of TIG arc plasma by cusp-type magnetic field with permanent magnet

The shape of arc plasma in gas-shielded arc welding is an important factor for the quality and efficiency of the welding. The arc plasma changes its shape by an external magnetic field because the arc is a flow of electricity and is subjected to the electromagnetic force. In this study, we examined the control of arc plasma by a cusp-type magnetic field. The field produces a high and low magnetic area alternatively, and changes the cross-section of the arc plasma from a circular to an elliptical shape. The previous study using solenoid coils to produce a cusp-type magnetic field reported that magnetized arc plasma provided deeper penetration. However, the solenoid device developed for the cusp magnetic field was too large in comparison with the size of the welding torch used for production welding. Therefore, this study investigated the magnetic control of arc plasma with permanent magnets that have recently become smaller in size and higher in intensity. Theoretical analysis model was constructed to determine the optimum arrangement of the magnets. This analysis requires a three-dimensional numerical model because the temperature-, velocity-, and electromagnetic fields of arc plasma change three-dimensionally by the additional magnetic field. It was analytically and experimentally shown in TIG arc welding that the arc shape could be elliptical cross-section even using the permanent magnets. Furthermore, our analysis showed that the effective magnetization direction of magnets was vertical, and this result was confirmed experimentally. As a result, we obtained the good bead appearance in the high-speed welding with this magnetic control.     

提高等离子切割机切割质量的方法

介绍了等离子切割机的孤切割原理,指出了等离子孤切割的质量评价标准,从切口宽度和平面度、切口熔瘤消除方法、如何避免双弧产生和大厚度切割质量控制等方面阐述了提高等离子切割机切割质量的方法.     

硬质合金工具强电流直流伸展弧等离子体CVD金刚石涂层的均匀性研究

采用自行研制的强电流直流伸展电弧等离子体CVD设备对真空渗硼预处理的YG6刀片进行了金刚石涂层沉积，并对放于有效沉积区域不同位置沉积出的金刚石涂层刀片以及刀片自身不同位置之表面涂层的形貌、厚度、质量进行了分析、研究。结果表明：(1)、硬质合金工具强电流直流伸展弧等离子体CVD金刚石涂层的组织、形貌、厚度、质量都是均匀一致的。(2)、利用强电流直流伸展电弧等离子体CVD设备可进行硬质合金金刚石涂层的批量沉积。