THE TECHNOLOGY OF ARC WELDING OF SMALL-SIZE COMPONENTS OF NUCLEAR PLANTS UNDER THE SHIELDING GAS HIGH-PRESSURE


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Abstract

The article presents the results of research of the influence of argon and helium high pressure on the welding arc process parameters and the samples of nuclear plants components with the increased internal pressure. The authors described the method for filling up and the special features of equipment for the components sealing. The installation is a chamber where the electrode and the product are placed. The arc is stricken by contact process with electromagnet that rises the electrode simultaneously with the welding process start. The increased value of the no-load voltage is the feature of welding power source. The experiment was carried out on the copper plate welded in the up to 15MPa helium and up to 10MPa argon environment. The research showed that with the helium pressure moving higher for each 1 MPa in the currents range of 25…50 A the welding arc voltage increases by 1,6…2 V. It influences much the quality of welding seams of small-size components of nuclear plants. The research showed that the weld geometry factor changes when welding in the increased pressure environment. The authors specified the optimal design of welded joints of small-size thin-walled nuclear plants components with the increased internal pressure. The technology of increased pressure welding can be used both for production of components made of pore-formation sensitive metals and for welding seam defects repair. The experiment on determination of required pressure was carried out on the rejected edge welds made of AD-1 aluminum alloy. The research showed that the rewelding of aluminum components with the rejecting pores at helium pressure of 0,6 MPa and higher corrects the defects.

About the authors

Yury Vasilievich Kazakov

Togliatti State University, Togliatti

Author for correspondence.
Email: Kazakov_Ju.V@tltsu.ru

Doctor of Engineering, Professor, professor-counsellor of the Department «Equipment and technology of welding and soldering»

Russian Federation

Alexander Vasilievich Kaplin

State Scientific Center – Research Institute of Atomic Reactors, Dimitrovgrad

Email: Kaplinav@yandex.ru

engineer

Russian Federation

Nikolay Alexandrovich Kostyuchenko

State Scientific Center – Research Institute of Atomic Reactors, Dimitrovgrad

Email: Cpm6mfy2@yandex.ru

engineer

Russian Federation

Stepan Alekseevich Andreev

State Scientific Center – Research Institute of Atomic Reactors, Dimitrovgrad

Email: Stepan-alekseevich@mail.ru

engineer

Russian Federation

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