Niobium alloy longitudinal seam tailor-welding method

Through the niobium alloy longitudinal joint welding method and laser welding technology, the problem of difficulty in manufacturing large-diameter niobium alloy nozzles in the existing technology is solved, and high-efficiency molding and thrust-weight ratio improvement are achieved.

CN119681440AInactive Publication Date: 2025-03-25BEIJING LANDSPACETECH CO LTD
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Patent Information

Application Number
CN202510213999.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-26
Publication Date
2025-03-25
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The prior art is difficult to manufacture large diameter niobium alloy nozzles, with heavy jacket structure and complex manufacturing process, making it difficult to meet the thrust-to-weight ratio and specific impulse requirements of liquid rocket engines.

Method used

The niobium alloy longitudinal joint welding method is used to manufacture large-size single-wall niobium alloy nozzles through laser welding technology, and use wide pressure plates and narrow pressure plates alternately to ensure the accuracy of the weld and the double protection of the protective gas.

Benefits of technology

The high-efficiency molding of large-size niobium alloy nozzles is achieved, which reduces the nozzle's self-weight, increases the thrust-weight ratio and specific impulse of the engine, and reduces the degree of oxidation of the welds.

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Abstract

The invention provides a niobium alloy longitudinal seam tailor-welding method which at least comprises the following steps that a male die is manufactured, a copper pipe provided with a vent hole is arranged in a groove in the outer surface of the male die, and the vent hole faces the interior of the groove; the scalloped segments to be welded are fixed to the outer surface of the male die, the adjacent scalloped segments are close to each other to form a welding seam, and the welding seam is arranged at the opening of the groove; a wide pressing plate is applied to the position, close to the weld joint, of the outer surface of the scalloped segment and fixed, so that the inner surface of the scalloped segment is tightly attached to the outer surface of the male die, and the weld joint gap meets the spot welding requirement; after ventilation is conducted in the groove through the copper pipe for a certain time, spot welding is conducted along the weld joint; after spot welding is completed, the wide pressing plates on the two sides of the welding seam are replaced with narrow pressing plates and fixed; welding equipment is used for welding the welding seams, and the adjacent scalloped segments are welded and fixed; and after welding is finished, the narrow pressing plate is removed, and the welded scalloped segment is taken down.
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