초록 ▼

A method of welding porous tube ends onto a tube sheet is disclosed, wherein tube ends projecting over the tube sheet are fused into a melt. Part of the melt is conducted to the outside in a radial direction, so that it lies on the end face of the tube sheet. Melt and tube sheet are then welded toge

A method of welding porous tube ends onto a tube sheet is disclosed, wherein tube ends projecting over the tube sheet are fused into a melt. Part of the melt is conducted to the outside in a radial direction, so that it lies on the end face of the tube sheet. Melt and tube sheet are then welded together. The tube end is preferably cooled from the inside by a metal pin is inserted into the tube end.

대표청구항 ▼

A method of welding porous tube ends to a tube sheet having bores, comprising: inserting said tube ends, having a porosity of at least 20% of tube wall volume, into the bores of said tube sheet so that said ends extend beyond an opposite surface of said tube sheet; partially melting said tube ends b

A method of welding porous tube ends to a tube sheet having bores, comprising: inserting said tube ends, having a porosity of at least 20% of tube wall volume, into the bores of said tube sheet so that said ends extend beyond an opposite surface of said tube sheet; partially melting said tube ends by contact with a hot tool which does not extend into said tube ends, while said tube ends are being cooled from their interiors, so that a melt so formed is conducted radially outwardly to rest partially upon and in contact with a flat annular portion of said opposite surface of said tube sheet and so that said tube sheet partially remains in contact with unmelted portions of said tube ends; and then hating said flat annular portion of said opposite surface of said tube sheet, thereby welding said tube ends and said tube sheet together.