Abstract
During welding, the ambient air temperature can significantly affect the obtained structures and mechanical properties of the welded joint. The given paper presents the results of the analysis of the structural and phase composition of welded joints obtained by the method of pulse-arc welding at a sub-zero ambient temperature. The effect of ambient temperature on the structure of the weld metal and the heat-affected zone during welding is investigated. The issue concerns structural low-carbon and low alloy steels. The microstructure is examined by scanning electron microscopy. The specifics of the effect of the modulation frequency of the welding current and the welding temperature on the microstructure of welded joints of structural steels of 09Mn2Si and St3sp grades are revealed. The present work allows conducting further research on the areas of the heat-affected zone, which will make it possible to evaluate their effect on the mechanical properties of the welded joint as a whole
Published Version
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