Shape correction and strengthening method for postwelding prestressing force of moderately thick light alloy plate

Abstract

The invention discloses a shape correction and strengthening method for postwelding prestressing force of a moderately thick light alloy plate. The method comprises steps as follows: S1), machining ofa welding part; S2), welding residual stress and deformation analysis; S3), design of a shot-blasting path and load of prestressing force; S4), ultrasonic shot-blasting shape correction; S5), outlineinspection and supplementary shape correction; and S6), ultrasonic strengthening for a weld surface. The method has main advantages as follows: an existing welding technology and process of a productare not changed, firing pin type ultrasonic shot-blasting equipment is utilized for shape correction and strengthening, shape correction and strengthening functions are realized by replacing workingheads of different sizes, and the operation is convenient and efficient. According to the method, after the welding part is cooled, residual stress which is not released is utilized as prestressing force load to be applied, so that energy required for shape correction can be greatly reduced, and meanwhile, damage of the material surface due to high-temperature-state shape correction is avoided. The method is particularly suitable for control treatment of welding deformation of a light high-strength material which is strengthened by heat treatment.

Description

Technical field: [0001] The invention belongs to the technical field of welding shape correction and strengthening, and more specifically relates to a prestressed shape correction and strengthening method for a light alloy medium-thick plate after welding. Background technique: [0002] Lightweight aluminum alloy or titanium alloy plate welding is an indispensable key process in the aerospace field, but after welding, the parts will be deformed due to thermal expansion and contraction at the weld seam. Excessive welding deformation will not only affect the dimensional accuracy of the product , and will reduce its bearing capacity and shorten its service life, so it is necessary to correct the deformation after welding. In addition to the overall shape correction method with tooling, the general method is to disassemble the tooling after welding to release the welding stress, and correct it according to the deformation of the parts. [0003] For thin-walled parts, the toolin...

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Problems solved by technology

[0003] For thin-walled parts, the tooling can be disassembled after welding, and the deformation can be corrected by laser peening, portable shot peening or stamping. However, the release stress of large-sized medium-thick plate parts is too large after welding, and the stamping correction may cause weld seam Cracking, while laser peening or portable shot peening is less efficient

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