Key points are not available for this paper at this time.
The impact strength of various zones of welded joints of pipes of large diameter and specimens after simulation of thermal cycles of welding has been studied. A relationship has been established between the structure of simulated and real welded joints and the results of their tests for impact bending. The rolled sheets and large-diameter electric-welded pipes of industrial steel of strength classes K56-K60 (Kh65-Kh70) were used as the material for the study. The applied technique using the GLEEBLE machine made it possible to form in the sample a structure close to the overheating zone of a real weld. Impact testing of a welded joint with different positions of the impact test concentrator and a simulated HAZ showed that the minimum toughness was observed in the case when the coarse-grained HAZ occupies a large proportion of the concentrator. The tests carried out showed the general patterns of the influence of the structure on the viscosity of the simulated HAZ and the overheating zone of the real weld in terms of the influence of the structure matrix, large particles of carbonitride phases and the MA component.
П. П. Степанов (Sat,) studied this question.