| 摘要 |
The invention concerns a method which consists in: cutting out in a metal sheet at least a planar plate (20) comprising a main part having the developed shape of the wall of the structural element and at least a matching overlapping and fixing part (26, 27, 28), folding the cut out plate (20) along a plurality of lines (23) so as to form the wall of the structural element comprising several annular sections non-aligned axially from the folded portions (22, 24,2 4', 25) of the main part of the cut out plate (20) and fixing by welding at least one matching overlapping and fixing part (26, 27, 28) on at least a folded portion (22, 24, 24', 25) and a second overlapping part. During welding, the one at least overlapping part (26, 27, 28) and the folded portion of the wall (22, 24, 24', 25) or the second overlapping part are maintained in elastic support one on the other, in a superimposed arrangement. Preferably, the welding is performed by transparency laser beam. The inventive structural element has numerous applications in a wide variety of industries. |
