METHOD OF ELECTRON-EMITTING WELDING OF THIN-WALLED PIPE WITH THIN-WALLED BIMETALLIC CONNECTOR Russian patent published in 2008 - IPC B23K15/00 B23K31/02 B23K33/00 

FIELD: technological processes.

SUBSTANCE: invention is related to method of electron-emitting welding of thin-walled pipe with wall thickness of less than 1.5 mm with thin-walled bimetallic connector and may be applied for production of crucial items for nuclear reactor core from zirconium alloys and stainless steel of grade X18H10T. Prior to welding welded end of thin-walled pipe is rolled as cone of not more than 14°, and aligning ring bulge is arranged in its end. Welded end of bimetallic connector is shaped as cone in a similar manner and aligning ring groove is arranged in its butt-end for ring bulge at pipe butt-end. After that split retaining rings are installed on welded ends of pipe and connector at the distance from butt-ends of not more than 5 mm. Welding is made with heating spot of electron beam with diameter of not more than 0.5 of thickness of pipe welded wall with welding speed of not more than 20 m/hour. Heat spot of electron beam is oscillated with frequency of not more than 50 oscillations per second symmetrically to line of joint by trajectory of semi-ellipse with length of small axis not more than thickness of pipe welded wall thickness.

EFFECT: high quality welded joints.

3 cl, 5 dwg, 1 ex