Abstract: A process and apparatus for soldering a platelike body inside hollow elements involves placing the platelike body and a hollow element on respective supports. The platelike body is drawn out or move to become positioned for electrical connecting to a first electrode of a soldering machine. This machine has at least a first and second electrode through which a voltage is applied to solder the platelike body to the hollow element using the Joule effect. A series of at least four phases will be carried out by the apparatus during the process. Protrusions are provided within the hollow element to concentrate current flowing therethrough and to aid connection of the element to the platelike body. Various check elements can be provided to determine the adequacy of the connection to the platelike body to the hollow element.

Abstract: The structure has a plurality of bars and a plurality of joints. These latter mainly consist of a cubic body whose center area is hollow and communicating with each of the six faces by way of a respective clearance hole. Three such clearance holes are so structured as to receive the head of the relative screw whose shank is arranged to be screwed onto an anchoring element located inside the bars.