Improvements in metallic profiles from section to closed contour (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the metal profiles of section to closed contour, characterized by the fact that the longitudinal edges of the strip of which the profiling is formed are linked to each other by joining (bending or crimping) on the one hand, and by continuous welding which brings together the surfaces, face to face, of the lips of the assembled joint, on the other hand. (Machine-translation by Google Translate, not legally binding)