PROCEDE ET APPAREIL POUR LA FABRICATION DE PANNEAUX ECHANGEURS DE CHALEUR DU TYPE A TUBES LAMELLAIRES

摘要

An apparatus and process for forming an opening in a composite metal panel on an edge of the panel at a position wherein the opening is to be formed and hammered to delineate a bond interface. The opening is formed between the sheets of the panel and inwardly of the edge thereof starting from the delineated bond interface. The opening is adapted to provide a means for communicating a fluid under pressure for inflating tubular passageways in the panel.