Chemical and structural inhomogeneity in the fusion zone of lowcarbon steel with austenitic weld in a shielded-gas welding

摘要

It is shown that one of the causes of an increase in chemical, structural and mechanical heterogeneities in the fusion zone of low-carbon steel with an austenitic weld (at a decreased level of its alloying) is deterioration in dilution of molten metal in the weld pool. Performing welding in nitrogen- and oxygen-containing shielding atmospheres favours improvement in dilution, which leads to a decrease in the level of heterogeneities in the fusion zone of low-carbon steel with the austenitic weld.