Abstract: This method of bonding the heads of connecting pins previously inserted in a ceramic substrate to the eyelets of conductors formed on the top surface of said substrate comprises the steps of: applying a droplet of flux to the head of each pin; applying a solder ball to the head of each pin where it is held in position because of the adhesive capacity of the flux; heating in a furnace containing a nitrogen atmosphere and having a peak temperature of 350.degree. C. to cause a solder reflow; and allowing to cool to enable the solder to set and to provide a permanent electrical and mechanical bond between the head of the pins and the eyelets. This method is suitable for use in manufacturing electronic modules employed in computers.