METHOD OF SEALING ARTICLE BY ARC WELDING Russian patent published in 1994 - IPC

FIELD: welding of article. SUBSTANCE: method involves sealing articles, for example radioactive isotope sources from refractory and chemically active metals having thickness of up to 2 mm, by welding connections of separate portions with nonmelting electrode in the presence of shielding gas; prior to welding separate portions of connections, determining gas flow rate U_cr from article inner volume through connection, at which molten metal splash from welding bath occurs; providing continuous control of gas flow rate current value in the process of welding connection; stopping welding process in case gas flow rate is increased up to (0,8-0,9)U_cr and holding the article in such state until gas flow rate current value from article cavity through connection is reduced to (0,2-0,5)U_cr; resuming the process and welding subsequent connection portion. EFFECT: simplified sealing process and equipment and high quality of welded connection. 3 cl, 2 dwg