A JOINT FOR SHEET MATERIAL AND A METHOD OF JOINING SHEET MATERIAL

摘要

A joint (40) for joining a first metal sheet (10) to a second metal sheet (30) comprises a plurality of deformable projections (14) on an edge (12) of the first metal sheet (10). Each deformable projection (14) has an aperture (16) therethrough to form two sides (18,20) and a deformable head (22). The sides (18,20) have dogs (24,26). A plurality of slots (32) are provided through the second metal sheet (30). The deformable projections (14) extend through the slots (32) in the second metal sheet (30). The deformable projections (14) are deformed such that the head (22) of the deformable projection (14) expands the dogs (18,20) of the deformable projections (14) beyond the sides (34,36) of the slots (32) to prevent withdrawal of the deformable projections (14) from the slots (32) in the second ductile sheet (30).