| 摘要 |
Deformable sheets are mechanically joined by punching and deforming the sheets in such a manner that one sheet is partially severed and the other sheet is correspondingly deformed without being severed. Pressure is applied to the joint, at least partially flattening both of the deformed portions of the sheets, outwardly expanding the partially severed portion of the severed sheet causing its severed edges to extend outwardly beyond the deformed but unsevered edges of the other sheet, thereby locking the sheets together to produce a waterproff sealed joint.
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