On the problem of tool destruction when obtaining fixed joints of thick-walled aluminum alloy blanks by friction welding with mixing

K. N. Kalashnikov; Калашников К. Н.; A. V. Chumaevskii; Чумаевский А. В.; T. A. Kalashnikova; Калашникова Т. А.; A. N. Ivanov; Иванов А. Н.; V. E. Rubtsov; Рубцов В. Е.; E. A. Kolubaev; Колубаев Е. А.; V. A. Bakshaev; Бакшаев В. А.

doi:10.17212/1994-6309-2021-23.3-72-83

On the problem of tool destruction when obtaining fixed joints of thick-walled aluminum alloy blanks by friction welding with mixing

Authors: Kalashnikov K.N.¹, Chumaevskii A.V.¹, Kalashnikova T.A.¹, Ivanov A.N.¹, Rubtsov V.E.¹, Kolubaev E.A.¹, Bakshaev V.A.¹
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Issue: Vol 23, No 3 (2021)
Pages: 72-83
Section: EQUIPMENT. INSTRUMENTS
URL: https://ogarev-online.ru/1994-6309/article/view/301950
DOI: https://doi.org/10.17212/1994-6309-2021-23.3-72-83
ID: 301950

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Abstract

Introduction. Among the technologies for manufacturing rocket and aircraft bodies, marine vessels, and vehicles, currently, more and more attention is paid to the technology of friction stir welding (FSW). First of all, the use of this technology is necessary where it is required to produce fixed joints of high-strength aluminum alloys. In this case, special attention should be paid to welding thick-walled blanks, as fixed joints with a thickness of 30.0 mm or more are the target products in the rocket-space and aviation industries. At the same time, it is most prone to the formation of defects due to uneven heat distribution throughout the height of the blank. It can lead to a violation of the adhesive interaction between the weld metal and the tool and can even lead to a destruction of the welding tool. The purpose of this work is to reveal regularities of welding tool destruction depending on parameters of friction stir welding process of aluminum alloy AA5056 fixed joints with a thickness of 35.0 mm. Following research methods were used in the work: the obtaining of fixed joints was carried out by friction welding with mixing, the production of samples for research was carried out by electric erosion cutting, the study of samples was carried out using optical metallography methods. Results and discussion. As a result of performed studies, it is revealed that samples of aluminum alloy with a thickness of 35.0 mm have a heterogeneous structure through the height of weld. There are the tool shoulder effect zone and the pin effect zone, in which certain whirling of weld material caused by the presence of grooves on tool surface is distinctly distinguished. It is shown that the zone of shoulders effect is the most exposed to the formation of tunnel-type defects because of low loading force and high welding speeds. It is revealed that tool destruction occurs tangentially to the surface of the tool grooves due to the high tool load and high welding speeds.

Keywords

Friction stir welding, welding tool, aluminum alloy, destruction

References

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On the problem of tool destruction when obtaining fixed joints of thick-walled aluminum alloy blanks by friction welding with mixing

Full Text

Abstract

Keywords

About the authors

References

Supplementary files