Patent FR-2974527-A1 (FR)
Title: Assembling two parts using continuous weld bead by applying geometrical and dimensional constraint between two parts to be assembled, and positioning two parts before realization of weld bead in offset manner according to offset direction
Inventor: FIDRY STEPHANE
IPC: B23K15/04
Filed: 2011-04-27
Abstract: The process comprises applying a geometrical and dimensional constraint between two parts (30, 32) to be assembled or between one part of the first part and another part of the second part, positioning the two parts before the realization of the weld bead in an offset manner according to an offset direction with respect to the desired end position, and carrying out the continuous weld bead, where the difference between the parts is compensated when performing the weld bead due to the constraints inherent in the operation. The two parts are clamped when the realization of the bead on a tool. The process comprises applying a geometrical and dimensional constraint between two parts (30, 32) to be assembled or between one part of the first part and another part of the second part, positioning the two parts before the realization of the weld bead in an offset manner according to an offset direction with respect to the desired end position, and carrying out the continuous weld bead, where the difference between the parts is compensated when performing the weld bead due to the constraints inherent in the operation. The two parts are clamped when the realization of the bead on a tool with constraints that are not identical in all directions and are lower according the offset direction (D1, D2). The weld bead is carried out using beam with high energy density. The offset direction is directed according to the direction of the weld bead. A value of the offset is determined, in an empirical way, by positioning samples same as the parts to be assembled on tools to weld the parts to be assembled, where the sample has an identical geometry on sides of the part to be assembled, by welding the samples with the firing parameters identical to the parts for welding the parts to be assembled and by measuring the value of offset between the positions of the samples before and after the welding operation that corresponds to the absolute value to the offset value of position of the parts to be assembled. The two parts to be assembled are in the form of rings on both sides of a junction plane connected by a continuous peripheral weld bead. Edges of the rings have shapes, which cooperate so as to position the parts coaxially. A first part of the two parts comprises a protruding form (42) bound by a geometrical constraint to another part of the second part. The tool include a unit to maintain the second part in manner such that it is immobilized and a unit to maintain the first part with a stopper separated from the protruding form of a clearance equal to the value of the offset, and is placed in such a way that the clearance is equal to the value of offset prior to welding. The tool comprises stoppers disposed on both sides of the protruding form. The protruding form is pressed against the stoppers so as to provide the clearance to the value of offset between the stopper and the protruding form before the welding operation and is arranged against the stoppers after the welding operation. The method further comprises producing a mark, which extends from both sides of the junction plane of the two parts.