Metal double-laser-beam impact forging low-stress welding device and method

Abstract

The invention discloses a metal double-laser-beam impact forging low-stress welding device and method. The device comprises a laser welding system, a laser impact forging system and an intelligent detection control system. The method comprises the following steps that 1) the laser welding system heats the surface of a metal workpiece for welding through high-energy laser beams by utilizing heat effect radiation, and meanwhile, a second short pulse laser utilizes a shock wave mechanical effect to perform impact forging on a welding area in a forging temperature range; and 2) laser welding parameters such as pulse width, energy, peak power and repetition frequency are mutually constrained and coordinated with the impact forging parameters, and the optimal temperature region, size range and impact strengthening parameters of the laser impact forging are determined. The thermal effect and the shock wave mechanical effect are fully utilized through the double laser beams, the labor and thetime are saved, special heating equipment is omitted, the internal residual stress of a welded part can be eliminated, the damage of the welding residual tensile stress can be avoided or reduced, andgreat economic benefits and social benefits are obtained.

Description

technical field [0001] The invention relates to the technical field of metal low-stress welding, in particular to a metal double laser beam low-stress impact forging welding device and method. Background technique [0002] Welding refers to a connection method in which two solid objects separated from each other generate atomic or intermolecular bonding forces through appropriate physical and chemical processes to form a whole. Laser welding is an efficient and precise welding method using laser as an energy carrier. It is one of the important aspects of the application of laser processing material processing technology. In the 1970s, it was mainly used for welding thin-walled materials and low-speed welding. The welding process is of heat conduction type, that is, Laser radiation heats the surface of the workpiece, and the surface heat diffuses to the interior through heat conduction. By controlling the parameters such as the width, energy, peak power and repetition frequen...

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Problems solved by technology

[0003] At present, the most common method to eliminate residual stress is to carry out welding treatment and post-welding heat treatment on the welded workpiece. The welding treatment refers to a series of treatment measures carried out near the welded area while performing the welding operation, mainly including Rolling with welding, rotary extrusion with welding, hammering with welding, vibration welding, chilling with welding, pre-stretching with welding, and electromagnetic induction with welding. The existing welding processing technology lacks intelligence and precision. The processing of welded parts with complex structures has certain limitations and cannot better eliminate weldment defects; post-weld heat treatment refers to a treatment measure applied to the welded parts after the welding operation is completed, that is, the welded parts are heated to a certain temperature And heat preservation for a certain period of time, using the reduction of the yield limit of the material at high temperature, the place with high internal stress will produce plastic flow, the elastic deformation will gradually decrease, and the plastic deformation will gradually increase to reduce the stress

Post-weld treatment is the treatment after the welding area is cooled. Its plastic deformation is small, and it is difficult to completely eliminate internal residual stress, deformation, micro-cracks and other defects. The complexity of the weldment heating device increases with the size and structure of the deposited parts. The increase in resistance will be multiplied, and the heating efficiency after the weldment is cooled is low, wasting energy

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