Abstract: Optimized method for assembling two substantially flat parts. To assemble two parts (10, 12) that are substantially flat using fixations (14) such as rivets or bolts, first the ratio R is calculated between tensile and bending stresses relating to the forces to be transmitted. The end line of the fixations (14) is then oriented along an angle &agr; whose absolute value is such that 10.8 ln(R)+16<|&agr;|<13.9 ln(R)+28 when the ratio R is 1 or more, and such that 16°<|&agr;|<28° when the ratio R is less than 1. The absolute value of angle &agr; does not exceed 90°.

Abstract: Optimised method for assemblling two substantially flat parts.

Abstract: The invention relates to a system for the non-destructive testing of the internal structure of objects.The system comprises an object support, an X-ray generator and means for the detection of the attenuated X-ray beam from the object. The system also comprises means for controlling the successive displacements of the support relative to a fixed reference mark in such a way that the incident beam scans a sectional plane of the object, and means for processing the signals from the detection means for the purpose of displaying a section of the object in the sectional plane, the generator and detection means being fixed with respect to the reference mark.Application to the inspection and testing of objects by X-rays.