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2020 №03 (05) DOI of Article
10.37434/as2020.03.01
2020 №03 (02)

Automatic Welding 2020 #03
Avtomaticheskaya Svarka (Automatic Welding), #3, 2020, pp.15-21

Use of steels of strength class C350-C490 in the production of building welded structures

V.D. Poznyakov
E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

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

Received: 17.01.2020

References

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3. Poznyakov, V.D., Zhdanov, S.L., Maksimenko, A.A. (2012) Structure and properties of welded joints of steel S390 (S355 J2). Ibid., 8, 6-10.
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