METHOD OF PREPARATION AND ASSEMBLY FOR WELDING OF THIN-WALL PIPES AND BIMETAL ADAPTERS Russian patent published in 2008 - IPC B23K33/00 B23K37/53 B23K101/04 

FIELD: instrument making.

SUBSTANCE: invention relates to techniques associated with preparation for assembly and assembly proper for welding thin-wall pipes and a bimetal adapter used in the reactor fuel core. The pipe and the adapter are fitted in split ring shrouds allowing the pipe and shroud ends to extend beyond the shroud boundaries. The thin-wall pipe end gets flared from inside to make a taper with an angle not exceeding 15°. The adapter to be jointed is shaped similarly. On the adapter end face a circular inner groove is made, its depth not exceeding the wall thickness, while, on the pipe end face, a circular flange is made with its outer diameter equal to inner diameter of the adapter circular groove. The pipe and adapter end faces to be welded together are fixed as-assembled using an internal tightening device.

EFFECT: accurate alignment in assembly for welding is ensured along with preservation of cylindrical form of jointed parts after welding.

2 cl, 8 dwg