Abstract: Connecting of a steel tube grid to a thin aluminum sheet to form a solar collector plate is carried out by explosive bonding to ensure a high thermal conductivity between sheet and tubes. Herein the sheet is prepressed in a pattern of channels of substantially semicircular cross section conforming to the shape of the tube grid. A heavy supporting plate is provided, in its flat surface, with a similar pattern of channels, but in mirror symmetry; the tubes of the grid are completely filled with water and the grid is laid into the channels of the supporting plate. Then the grid is covered by the sheet, with the channels covering the tubes and the flat sheet portions in contact with the surface of the supporting plate. Explosive charges in ribbon shape are laid onto the sheet along the apices of all channels on their outside, and the charges are detonated, whereafter the joined grid and sheet are removed from the plate.