| Abstrakt: |
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 the strength class from c350 to c490 was investigated. it was established that as a result of the action of thermal cycles of welding, metal structure of the heat-affected zone of most microalloyed steels of the strength class from C350 to C490, except for steel 09g2syuch, 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 bainitic to bainito- 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. [ABSTRACT FROM AUTHOR] |
