The Alternating Current Electrode Processes

1979 ◽  
Vol 18 (1-2) ◽  
pp. 56-64 ◽  
Author(s):  
S. Venkatesh ◽  
Der-Tau Chin
Keyword(s):  
Alternating Current ◽  
Current Electrode ◽  
Electrode Processes

scholarly journals Alternating Current Polarography and Electrode Processes

1963 ◽  
Vol 11 (1-2) ◽  
pp. 50-57 ◽  
Author(s):  
B. BREYER ◽  
T. BIEGLER ◽  
H. H. BAUER
Keyword(s):  
Alternating Current ◽  
Electrode Processes

Experiment Design with Full Factorial in Gas Tungsten Arc Welding Parameters on Aluminium Alloy 5083

2013 ◽  
Vol 711 ◽  
pp. 183-187 ◽  
Author(s):  
Prachya Peasura
Keyword(s):  
Arc Welding ◽  
Parent Phase ◽  
Welding Current ◽  
Alternating Current ◽  
Gas Tungsten Arc Welding ◽  
Welding Parameters ◽  
Current Electrode ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Full Factorial

This research was to study of gas tungsten arc welding (GTAW) welding parameters that affects to the mechanical properties of aluminum alloy AA5083 welding with GTAW. The full factorial design was experiment. The factors was study in type of polarity on alternating current (AC), direct current electrode negative (DCEN) and direct current electrode positive (DCEP), levels of welding current for 180,200,220 and 240 amp. The specimen to analyses the physical properties has microstructure and hardness of weld metal and heat affected zone. The result showed that type of welding current and levels of welding current interaction hardness at the level of confidence 95% (P-value<0.05). The factor hardness maximum of weld metal was alternating current at level of current 240 amp. and hardness of 136.53 HV. The factor hardness maximum of HAZ value was alternating current at level of welding 220 amp. and hardness of 169.43 HV. The welding parameters can result in increasing Mg2Si intensity in parent phase. It can also be observed that Mg2Si at the parent phase decreased due to high welding current in HAZ.This research can be used as information in choosing how to welding parameter for gas tungsten arc welding of aluminum alloy.

New Developments to Reduce Arc Blow during SMAW of Pipelines

2018 ◽  
Vol 938 ◽  
pp. 96-103 ◽  
Author(s):  
Sergey V. Baklanov ◽  
Anton S. Gordynets ◽  
A.S. Kiselev ◽  
Mikhail S. Slobodyan
Keyword(s):  
Magnetic Field ◽  
Direct Current ◽  
Arc Welding ◽  
Alternating Current ◽  
Shielded Metal Arc Welding ◽  
Electrode Coating ◽  
Current Electrode ◽  
Repair Work ◽  
Metal Arc Welding ◽  
The Magnetic Field

In some cases, magnetic blow does not allow using direct current for shielded metal arc welding. This is especially true for repair work on pipelines after magnetic flaw detection. Alternating current is useful to control magnetic arc blow during welding. The most promising results give technologies using alternating current with a rectangular waveform. However, the advantages of this method have not been used until now. The main goal of this study is to determine the influence of the parameters of the arc on its stability and the metal transfer mode during shielded metal arc welding under perturbing action of the magnetic field. The proposed methodology of experimental research allowed identifying the cause of arc extinction using direct current electrode positive. This is due to displacement of molten droplets of metal by the magnetic field from of the uneven melted electrode coating and its subsequent separation. This problem was solved using alternating current with the square waveform pulse mode at a frequency of 500 Hz. The amplitude-time parameters of the current pulses provide stabilization of the arc and volume of the molten electrode metal.

scholarly journals The polarization of zinc electrodes in neutral and acid solutions of zinc salts by direct and alternating currents.—Part. I

1926 ◽  
Vol 112 (760) ◽  
pp. 259-279 ◽  
Keyword(s):  
Zinc Sulphate ◽  
Free Acid ◽  
Preceding Paper ◽  
Alternating Current ◽  
Zinc Salt ◽  
Factors Affecting ◽  
Electrode Processes ◽  
Zinc Salts ◽  
Current Densities ◽  
Zinc Sulphate Solution

In the preceding paper it was shown that an amalgamated Line electrode made anode in an anode zinc sulphate solution undergoes considerable polarisation, and that tins polarisation can be more than overcome by the superposition of a sufficiently large alternating current of high frequency. Further, Allmand and Puri mention experiments in which a cathode of amalgamated zine had superposed on it alternating currents of intensities up to 200 times that of the direct current, and of frequencies varying between 20 and 400, the effect being to increase the polarisation of the electrode, which became more negative. These results were not to be anticipated from previous work, and it seemed that a closer investigation of the whole subject might not only explain the facts referred to, but perhaps throw fresh light on the mechanism of the electrode processes involved. As possible factors affecting the phenomena could be considered the amalgamation or otherwise of the zinc electrode, the presence or absence of free acid in the solution, the nature of the zinc salt ( e. g. , whether sulphate or chloride), duration of electrolysis, temperature, the absolute and relative values of the direct and alternating current densities, and tbs frequency of the alternating currents. The present paper contains an investigation of some of these points, working at room temperature and with zinc sulphate solutions, potential measurements have been made with amalgamated zinc electrodes in absence and in presence of free H 2 SO 4 , and with unamalgamated electrodes in neutral solution. Alternating currents and compound currents have been used, and a few experiments made with direct currents, frequencies varying between 50 and 11,000 have been worked with.

Cathode Ray Oscillography in A.C. Polarography and Tensammetry

1962 ◽  
Vol 15 (1) ◽  
pp. 34 ◽  
Author(s):  
T Biegler
Keyword(s):  
Alternating Current ◽  
Electrode Processes ◽  
The Relationship

Applications of the cathode ray oscilloscope in a.c. polarography and tensammetry are described. The instrument is used to enable observation of the waveform of the alternating current and of the relationship between alternating current and time during the growth of a mercury drop. Some typical results are presented and it is shown that the method can provide useful information about electrode processes.

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