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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Knyazeva I.A. – post-graduate student E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Zolotonosov Ya.D. – doctor of technical sciences, professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan State University of Architecture and Engineering The organization address: 420043, Russia, Kazan, Zelenaya st., 1 Lisovskii V.A. – candidate of technical sciences, associate professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Vyatka State University The organization address: 610000, Russia, Kirov, Moscovskaya st., 36
Title of the articleProduction of spring-twisted channel of heat exchangers by laser welding
Abstract.The article discusses the features of the laser welding of spring-twisted channels with continuous and pulsed laser radiation in the search for the optimal technology for their manufacture of steel AISI 304. The analysis of the microstructure of joints measured hardness in various zones of the metal weld. When laser welding the coiled spring-channel continuous laser weld macrostructure consists of elongated crystallites rising edges of the seam weld pool depth in the direction of removal of the thermal flow. The crystallites are formed smaller austenite dendrites length from 30 to 50 microns. Heat affected zone is clearly expressed, it is the size of about 20 microns. Microstructure of welded joints produced multipass pulsed laser welding, characterized by a high dispersion. Dendrites are disoriented in the weld pool, in form close to equiaxed grains and have an average size of 20-30 microns, which ultimately can positively affect resistance to cold cracking. The experimental results showed that due to local heat input and reducing the size of the weld pool and the heat affected zones, pulse laser welding can significantly minimize the impact of stress on the geometric parameters of the spring-twisted channels as well as to avoid the appearance of cracks, but does not fully provide the desired depth of penetration.
Keywords.heat exchangers, the helical spring-channel laser welding, pulsed laser radiation, a continuous laser beam, the microstructure of the weld, the hardness.
For citations:Knyazeva I.A., Zolotonosov Ya.D., Lisovskii V.A. Production of spring-twisted channel of heat exchangers by laser welding // Izvestiya KGASU. 2015. №3(33) P.103-108.


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