Avtomaticheskaya Svarka (Automatic Welding), #10, 2016, pp. 28-34
Comparison of procedures for evaluation of effect of welding thermal cycle on impact toughness of HAZ metal of welded joints from low-alloy steels
V.D. Poznyakov, L.I. Markashova, S.L. Zhdanov, E.N. Berdnikova, A.V. Zavdoveev and A.A. Maksimenko
E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: email@example.com
One of the most important indices of mechanical properties, which together with other factors determine the quality and working capacity of the welded joints, is impact toughness. Impact toughness is characterized by material capability to absorb mechanical energy in process of deformation and fracture under impact load effect. This paper carries a comparative evaluation of effect of welding on impact toughness of HAZ metal of specimens, produced from bead-on-plate tests, and reference ones, treated on welding thermal cycle, from steel 10G2FB. It is determined that effect of the welding thermal cycles on impact toughness indices of HAZ metal of welded joints from steel 10G2FB is ambiguous. Rapid decrease of KCU
values is observed at w6/5
< 6 °C/s cooling rates. Increase of cooling rate provides for rise of HAZ metal impact toughness and in some cases it reaches KCU
values of base metal. Therefore, it is a good correlation of the values of impact toughness between the specimens, treated on welding thermal cycle, and specimens, produced from welded joints. It is insignificant difference in nature of their fracture. 7 Ref., 2 Tables, 6 Figures.
low-alloy steel, impact toughness, welding thermal cycle, bead-on-plate test, heat-affected zone, structure, fracture surface
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