Abstract
Rotational friction welding is one of the promising technologies for the creation of high-quality welded joints, which is widely used in the pipe industry when producing wide nomenclature drill pipes of medium-carbon alloy steels. Despite the long-term application of this method by the Russian enterprises manufacturing this type of products, there are few published data in the scientific literature aimed at the detailed study of structural and mechanical heterogeneity of such compounds, including after various modes of their heat treatment. The authors evaluated the structural and mechanical heterogeneity of welded joints of 30HGSA-40HN2MA steels tested to produce geological exploration drill pipes in the initial state and after the application of various temperature-time modes of induction annealing. The paper presents the results of hardness measurement in different areas of welded joint and the results of rupture test and impact-viscosity test. During the study, the authors determined the peculiarities of phase transformations occurring in welded materials depending on the temperature and time factors that affected the degree of mechanical heterogeneity of the annealing zone and the level of mechanical properties, including the nature of impact fracture. It is shown, that, during the rupture tests, the mechanical properties of welded joints of 30HGSA-40HN2MA steels generally depend on the properties of thermomechanical impact zone of 30HGSA steel as the weakest area where the deformation is localized and the rupture occurs. The authors determined the formation of hardening structures during the induction annealing from the 40HN2MA steel side influencing the tendency for brittle fracture of the welded joint area. Optimal modes of heat treatment of this welded joint combination from the position of full-strength and reliability of the structure are recommended.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Vektor nauki Tol'yattinskogo gosudarstvennogo universiteta
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
