Method for accurately controlling double-laser-beam bilateral synchronous welding deformation of T-shaped structure

Abstract

The invention discloses a method for accurately controlling double-laser-beam bilateral synchronous welding deformation of a T-shaped structure. By aiming at solving the problems of large post-weldingdeformation, post-welding residual stress and the like of a T-shaped structural weldment based on double-laser-beam bilateral synchronous welding in the field of aerospace at present, the method forcorrecting the T-shaped structural weldment by electromagnetic hammering is proposed, a thermodynamic model in a welding process of a T-shaped joint is constructed by finite element software, data ofelectromagnetic hammering force and hammering frequency are obtained, then the deformation of the T-shaped structural weldment is accurately controlled in a following welding process by changing a power-up state of an electromagnetic coil, and therefore, deformation of the workpiece in the double-laser-beam bilateral synchronous welding process is corrected to the utmost extent. According to the method, the post-welding deformation quantity and welding residual stress can be greatly reduced, welding quality of the workpiece is guaranteed, furthermore, additional processes and labor-hours are not needed in a welding implementation process, and production efficiency of the T-shaped structure based on the double-laser-beam bilateral synchronous welding is improved.

Description

technical field [0001] The invention relates to the technical field of laser welding of T-shaped joints, in particular to a method for precisely controlling the simultaneous welding deformation of two sides of a T-shaped structure with double laser beams. Background technique [0002] Among many welding processes and methods, double-laser simultaneous welding on both sides can facilitate the weight reduction of the fuselage and automatic low-cost manufacturing without destroying the integrity of the fuselage skin. It has broad application in the aircraft manufacturing industry. development and application prospects. However, during the welding process of aluminum-lithium alloys, welding defects such as post-weld residual stress, plastic deformation, and severe welding cracks are prone to occur, which in turn affects the overall life of the welded components. Existing methods to control post-weld deformation include post-weld heat treatment, post-weld hammering, etc. Post-we...

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Problems solved by technology

[0005] Aiming at the current problem of double-laser beam double-sided synchronous T-shaped structure after welding, especially the T-shaped joint of aluminum alloy, the present invention proposes a method of using electromagnetic hammer to correct the shape, which can precisely control the welding during the welding process The deformation of the workpiece, the cost is low, it is convenient for automatic production, and its effect of controlling the deformation after welding is remarkable

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