Method for manufacturing pipes from zinc sheet, particularly guttering pipes, machine for implementing this method and pipes thus obtained

摘要

The pipe for a drainpipe is made up of a thin sheet of zinc sheet wound on itself into a cylinder and whose longitudinal edges overlap. It includes joggling 15 defining an edge strip 14C onto which there is welded, as it files past, the other free edge 13 of the pipe 10 with the aid of a tin/plumb alloy weld, the bead 17 of which penetrates, by capillarity, between the parts of sheet metal in contact on the marginal strip. Application to the automatic manufacture of zinc drainpipes. <IMAGE>