Avtomaticheskaya Svarka (Automatic Welding), #3, 2020, pp.15-21
Use of steels of strength class C350-C490 in the production of building welded structures
E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.
The effect of thermal cycles of arc welding on the structure and mechanical properties of metal of the heat-affected-zone of welded joints of microalloyed structural steels of strength class from C350 to C490 was investigated. It was established that as a result of the action of thermal welding cycles, the metal structure of the heat-affected-zone of most microalloyed steels of strength class from C350 to C490, except for 09G2SYuch steel, remains stable bainite in a wide range of cooling rates, and mechanical properties do not change significantly. As a result of welding, at moderate cooling rates the structure of the heat-affected-zone metal in the steel 09G2SYuch can change from bainite to bainite-martensitic and martensitic as the metal cooling rate increases. As a result of that, the values of static strength and impact toughness of the metal are increasing and its ductile properties are reduced. 12 Ref., 5 Tabl., 7 Fig.
Keywords: structural steels, thermal cycle of welding, metal structure, mechanical properties, welded building structures
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