Evaluation And Analysis Operational Behavior Of Electordes

Arc physics theories of welding material include the metal transfer mode, the physical mechanism of metal transfer, arc behavior and characteristics of electric arc parameter, and so on. Based on arc physics theories of welding for operational behavior of welding material research has been the focus. The operational behavior of welding material which is based on arc physics theories of welding is hot issue all the time. The process of welding material, metal transfer and arc parameters are closely related, study in this field mainly focuses on welding metal transfer form and the stability of the welding process. We evaluate operational behavior through welding current and voltage , welding arc through time and short time Short circuit peak current, average current and voltage rating of welding process. The related research uses the welding voltage and current to analyze metal transfer and the stability in welding process, uses arc and short-circuiting time, short-circuiting peak current, mean current and voltage to assess the welding process stability.In this paper, we have studied four kinds of cellulose electrodes with the technique of test methods, high-speed photographic method and the Hanover Arc Quality Analyzer on l metal transfer, arc parameters. Stability of the four kinds of cellulose electrodes has been arranged in the superiority-inferiority: HT-1, HT-2, HT-3, HT-4. High-speed photography experiments show that: metal transfer mode of cellulose electrode is short-circuit transfer, spray transfer, explosion transfer mixed-mode. Short-circuiting and spray transfer are major mode of electrode. The proportion of metal transfer model for four kinds of electrode is different, which reflects operational behavior of four kinds of electrode. Hanover Analyzer tests on the arc welding parameters of the four celluloses. The cellulose electrode current and voltage waveforms, voltage and current probability density curve characterize the metal transfer modes of cellulose electrode are short-circuit transfer, spray transfer.Having compared experimental results we know that:gas blowing from electrode coating is an important factor which effects metal transfer mode. Regular spray transfer is the ideal metal transfer mode of cellulose electrodes. The more spray transfer has, the better stability of cellulose electrode is. For arc parameters give expression to metal transfer mode,characteristic quantities of arc parameters can be used to symptom stability of cellulose electrode. For example, the voltage coefficient of variation, U-I plans to characterize the stability of welding arc. Evaluation model has been set up by the average voltage, short circuit voltage of the probability density and high current density and probability, voltage coefficient of variation. The model shows that welding spatter has a close relationship with welding voltage and welding voltage coefficient of variation. Metal transfer mode resolves stability of cellulose electrode; welding voltage and current fluctuations reflect metal transfer, reflect stability of cellulose electrode. Under welding current 135A and DCEP conditions, we use probability density that is short andΣn (Us) and the short circuit current probability density andΣn (Is) indirectly characterize the proportion of spray transfer, that can be used for assessing the operational behavior of the cellulose electrode.In order to assess the operational behavior of cellulose electrodes, the frequency spectrum analysis of voltage is carried out. The main distribution peak of power spectrum describes short-circuiting transfer; The frequency spectrum information reflects stability of the arc. The result shows that the frequency spectrum analysis of cellulose electrodes voltage can reflect the modality and stability in the process of welding and assess the operational behavior of cellulose electrode.