Automatic Welding, 2018, №03



2018 №03 (09)

DOI of Article 10.15407/as2018.03.01

2018 №03 (02)

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Avtomaticheskaya Svarka (Automatic Welding), № 3, 2018, pp. 7-12

Weldability of high-strength alloyed steels with yield strength OF 590...785 MPa

V.D. Poznyakov

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazimir Malevich Str., 03150, Kyiv. E-mail: office@paton.kiev.ua
 
 
This paper summarizes the results of investigations of influence of the thermal cycles, characteristic for arc welding processes, on the structure and mechanical properties of high-strength alloyed steels with yield strength of 590...785 MPa, as well as on their tendency to cold cracks formation. The structural transformations in the metal of heat-affected-zone of welded joints were investigated using a quick-response dilatometer, and its mechanical properties and tendency to cold cracks formation were evaluated according to the results of tests of standard specimens and by the Implant method, respectively. The diagrams of the structural transformations of austenite in the area of metal overheating of heat-affected-zone of a number of high-strength alloyed steels, the dependence of change of their mechanical properties during welding, and also the data, characterizing the tendency of high-strength alloyed steels to cold cracks formation at different concentrations of diffusion hydrogen in the deposited metal, are presented. 15 Ref., 4 Tab., 4 Fig.
 
Keywords: high-strength steels, arc welding, metal structure, mechanical properties, cold cracks

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