Post-welding prestress shaping and strengthening method for light alloy medium plate

Abstract

The invention discloses a post-welding prestress shaping and strengthening method for a light alloy medium plate and belongs to the technical field of welding shaping and strengthening. The method comprises the following partial step of S1, processing a weldment: carrying out single-sided welding and double-sided forming on the light alloy medium plate by adopting parameters of a welding process,and keeping a workpiece in a clamped state after welding and cooling the workpiece. In the invention, shaping and strengthening is carried out by means of a firing pin ultrasonic shot blasting device.By replacing the firing pin working heads of different sizes, shaping and strengthening functions are achieved, so that the method is convenient to operate and efficient, and polishing and welding work can be completed synchronously. By carrying out polishing, a welding surface is of a bevel structure, so that it is convenient to weld the light alloy medium plate which is heavy. The medium plateis preheated by means of heat energy generated by polishing a low-temperature rigid structure, so that the probability of generating a weld joint can be reduced on an energy-saving basis, and influence on stress is weakened.

Description

technical field [0001] The invention belongs to the technical field of welding shape correction and strengthening, and in particular relates to a post-weld prestress shape correction and strengthening method for light alloy medium-thick plates. 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. Therefore, 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. According to the deformation of the parts Correction. [0003] For thin-walled parts, the tooling can be ...

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Problems solved by technology

[0005] The purpose of the present invention is: in order to solve the deformation of the parts due to thermal expansion and contraction at the welding seam after welding. Excessive welding deformation will not only affect the dimensional accuracy of the product, but also reduce its bearing capacity and shorten the service life. The welding process and control welding deformation of light alloy medium and thick plates is relatively large. In order to improve the welding quality, it is necessary to preheat the light alloy medium and thick plates before welding, which is costly and will also reduce the light weight to a certain extent. The welding efficiency of alloy medium and thick plates, and in the past, when welding some thicker light alloy plates, it is usually necessary to grind the welding surface, from the vertical plane structure to the inclined plane structure, after finishing the grinding work, During the welding process, at this stage, because the polished surface is prone to oxidation, it is easy to have a certain impact on the welding quality, and a method of prestressed shape correction and strengthening after welding of light alloy medium and thick plates is proposed.

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