电弧光谱

Based on the developed variable polarity TIG welding power supply ,it establishes variable polarity TIG welding arc multi-information measuring and processing system by adopting memory oscilloscope,high speed video-recorder?spectrograph?welding arc dynamic analyzer and computer.

以研制的变极性TIG 焊接电源为实验平台，采用记忆示波器、高速摄像仪、光谱分析仪、焊接电弧动态分析仪，建立起变极性TIG焊接电弧多信息测试分析系统，同时采集焊接电流、电弧电压、电弧形态和电弧光谱等重要信息，并基于VisualC++语言开发的软件系统对采集的各种信息进行融合及分析。

In order to check the microscopic model, the paper does arc spectrum experiment, analyses arc spectrums of aerospace relay at aforementioned phenomena.

为了检验前述电弧微观模型，本文进行了电弧光谱实验，分析了航天继电器电弧等离子体在前述几种特定气氛下所发出的光谱。

It has been found that the distribution of MIG arc spectrum along wavelength window shows spatial similarity. Amplitude fluctuations related to metal droplet transfer are also found in the dynamic signals of line spectrum.

对焊接电弧光谱进行的研究发现，MIG焊电弧光谱的分布表现出明显的空间相似性，谱线信号波形中含有与熔滴过渡有关的大幅度波动。

In summary, this dissertation has made contribution to welding arc physic knowledge, discovered the respective spectrum signal features of each kind metal transfer mode, put forward an new approach for detecting droplet transfer in metal gas arc welding and provided enough theoretical and experimental guidance to the further research, meanwhile, it has also predicted the applications of arc spectrum information in other fields.

总之，本文的工作充实了焊接电弧物理和电弧光谱信息的知识内容，提出了熔化极气体保护焊熔滴过渡传感和检测的新手段，发现了各种熔滴过渡的多方面光谱特征，为熔化极气体保护焊熔滴过渡的研究和过程控制领域的开拓，为新型电弧传感器的开发，奠定了理论、实验和技术的基础，同时也预示了电弧光谱信息在其它领域应用的可能。

With the analysis of the radiation theory, energy transmission and the balance properties of the radiation spectrum of the arc plasma, the distribution characteristics of the arc spectrum along frequency, space, and time field was investigated, which provide theoretical foundation for the research on the spectrum information of Pulsed MIG welding.

熔化极气体保护焊电弧等离子体辐射光谱中含有丰富的反映熔滴过渡的信息，本文在对脉冲MIG焊电弧光谱信息深入考察的基础上，首次将其应用于脉冲MIG焊熔滴过渡过程的控制研究中，并真正实现了一脉一滴（1峰0基）的熔滴过渡过程，开创了利用电弧光谱信息控制焊接物理过程的先河。

Through collection of TIG welding arc light spectrum of steel with disturbing factor,this paper studied the effect of disturbing factors such as rusty and various gas flow rate on the arc light spectrum distribution.Furthermore, the light radiation of different spectral zones was studied to get the spectral signals that could reflect the disturbing factors which were critical for online welding quality control.

通过对干扰因素下TIG焊电弧的光谱信息进行采集，研究了气流量变化、焊接试件表面存在锈等干扰因素对焊接过程电弧光谱分布的影响，并基于光谱分布的分析，进一步探讨了不同光谱谱段对干扰因素的反映，寻求实现焊接过程质量在线光谱测控的理论依据。

The sepctrum structures and the differences between TIG and MIG welding arc are analysed.The corresponding relations between metal transfer and welding arc spectrum structure are pointed out especially.

通过分析得出了TIG焊电弧光谱空间分布的差异性和MIG焊电弧光谱空间分布的相似性，着重指出MIG焊电弧光谱与熔滴过渡之间存在密切关系。

On the basis of cognition of the potential significance of welding arc spectrum dynamic characteristics and with the destination to find out new sensoring method of metal transfer,this paper provided the parasynchronous principle and in turn verified the relationship between the pulses in the waveform of arc spectrum signals and metal droplet transfer with para high speed photography apparatus.

基于对熔化极气体保护焊电弧光谱信号动态特征重要意义的认识，以发现新的熔滴过渡传感方法为目的，本文提出准同步高速摄影法，设计了准同步光谱信号-高速摄影检测装置，验证了光谱信号波形中的脉冲是熔滴过渡所为，它们之间存在着确定的对应关系。

Results of experiments under different conditions show that, compared with arc electrical signal and arc light signal, arc spectrum signal is of more advantageous property. It can not only detect short-circuit metal transfer, but also more effectively detect droplet in free transfer mode than electrical signal. It can not only detect the droplet transfer in the CO〓 welding, but also can detect spray transfer in Ar welding with advantage over arc light signal. Especially, its outstanding capability of detecting steam spray transfer where other approaches fail, shows that are spectrum information has the utmost signal quality in metal droplet transfer detecting.

多种工艺条件下的对比实验表明，与电弧电信号及光强信号相比，电弧光谱信号具有更为优越的信号品质，其不仅可以检测熔滴短路过渡而且优于电信号可以有效地检测自由过渡；不仅可以检测活性气体保护条件下的熔滴过渡，而且优于光强信号可以检测惰性气体保护条件下的喷射过渡，特别是其可以实现熔滴射流过渡的检测，解决了这一用其它信号无法克服的难题，体现出电弧光谱信息在熔滴过渡研究中所独具的优越性。

On the basic of experiments,the testing results of welding arc crossspectrum distribution of various arc crosssection along wavelength window are presented.

在试验的基础上，给出了焊接电弧光谱的频域及空间分布的测试结果，分析了焊接电弧光谱的结构。

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。