Keyword: «welded joints»

Research on the development of methods for welding thick-walled polymeric pipes is given. It is shown that the developed welding methods after the selection of technological parameters can be used when connecting thick-walled polymer pipes of large diameter.

The article presents the activities of the accredited laboratory for destructive and other types of testing of materials of FRC ‘Yakutsk Scientific Center of the SB RAS'. The main methods of destructive testing used in research are listed. Examples of the works carried out with a brief description of the results obtained are given. The role of the testing laboratory in interaction with industrial enterprises and in the development of scientific research is shown.

The paper provides a brief overview of the technological methods studied at the Institute of Physics and Technical of the Siberian Branch of the Russian Academy of Sciences. Impact-mechanical treatment is proposed as one of the promising methods for hardening surfaces and reducing residual welding stresses. The development of fundamental research in the field of development and improvement of technological methods of post-weld processing to improve the physical and mechanical properties of welded joints of metal structures operated at low climatic temperatures is an important area with high opportunities for their intro-duction into production.

The problem of ensuring the reliability and strength of equipment and structures operating at low climatic temperatures is an urgent scientific and technical task today. Ensuring sufficient cold resistance and strength means preventing brittle fracture of structural elements at loads that are significantly lower than the calculated ones. One of these characteristics is impact strength. The paper presents the results of studies of the impact strength of a welded joint of steel 10ХСНД obtained by DC welding and pulsed arc welding.

The study is devoted to the urgent problem of residual welding stress management in welded joints made of low-alloy steel 10XSD. The effect of ultrasonic shock treatment (UO) on the redistribution of HP after welding at room and subzero temperatures has been experimentally studied. It is established that after welding, significant tensile stresses are formed in the seam area, the level of which increases during low-temperature welding. It is shown that UO effectively transforms tensile stresses into compressive stresses, which contributes to an increase in the fatigue life of joints.