Classification of pulse shapes for micro resistance welding
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Abstract
The paper is devoted to the problem of systematization of the information concerning the applying different shapes of electrical pulses for micro resistance welding implementation. The relevance of the problem is explained by direct dependency of welded joints quality on welding pulse shape appropriateness. The aim of the paper is to create the classification of known pulse shapes applied in micro resistance welding using the most substantial criteria. To achieve the stated aim, first, the analysis of electrophysical processes taking place in welding contact during resistance welding was carried out. Under the analysis, the complicated character of welding area resistance change during the welding process was shown and explained, and the most important factors affecting the obtained quality of welded joints were specified. As a result of the carried out analysis, the importance of matching the welding pulse shape with the electrophysical processes in welding contact was proved. Further, the overview of known shapes of electrical pulses applied in micro resistance welding was done. In the overview, different shape pulses, including single pulses and pulse groups, unregulated and regulated pulses, alternating current and direct current pulses, were shortly characterized and compared in terms of providing high quality welded joints. The reasons of applying certain pulse forms were explained in the overview as well. Next, based on the overview of pulse shapes and considering the particularities of electrophysical processes in welding contact, the most substantial classification criteria for welding pulses were highlighted. Using these criteria, the descriptive classification diagram of welding pulses variety known in micro resistance welding was created and the example of its applying was suggested. The developed classification diagram is recommended to use for preliminary defining the optimal welding modes under the specific conditions.
Ref. 30, fig. 8.
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