Laser auxiliary hot-pressure welding device and welding method for connecting titanium / aluminum dissimilar materials

Abstract

The invention provides a laser auxiliary hot-pressure welding device and welding method for connecting titanium / aluminum dissimilar materials. The implementation process of the laser auxiliary hot-pressure welding device and welding method comprises the following steps that titanium alloy base metal and aluminum alloy base metal are arranged on a workbench after being connected in a lap joint mode according to the principle that the titanium alloy base metal is arranged above the aluminum alloy base metal; after a microprocessor is started, according to a preset pressure value and a preset stepping speed of the workbench, the microprocessor controls the rotation speed of a stepping motor, a pressure control valve controls the working pressure of an air cylinder, a pressure test of an idler wheel is conducted first, then pressure by the idler wheel at a welding point on the base metal is transmitted through a pressure sensor, and the air cylinder is controlled in time so as to amend the pressure value; laser beams are irradiated on a weld joint of the base metal connected in the lap joint mode, the idler wheel is used for acting on the dissimilar materials, and the dissimilar materials mutually diffuse under the pressure action so that the purpose of welding can be achieved. According to the laser auxiliary hot-pressure welding device and welding method for connecting the titanium / aluminum dissimilar materials, brittle intermetallic compounds generated when the titanium / aluminum dissimilar materials are connected can be reduced remarkably, welding of thin dissimilar metal plates is easy to realize, welding efficiency is high, welding cost is low, the quality of a connector is high because the content of the intermetallic compounds is small, the welding cost is quite low, and the quality of the connector is good.

Description

technical field [0001] The invention relates to a laser-assisted thermal pressure welding device and a welding method for connecting titanium / aluminum dissimilar materials. Background technique [0002] Recently, the joining of titanium / aluminum dissimilar metals has been increasingly used in the aerospace and automotive industries. However, it is very difficult to weld dissimilar metals by fusion welding. The main reason is that more brittle intermetallic compounds will be produced at the interface during the welding process, which will have a great impact on the quality of the welded joint. The laser-assisted thermocompression welding method comprehensively utilizes the advantages of laser welding and pressure welding. This new welding method has unique advantages for welding with a large difference in the melting point of the base metal. At present, most of the methods to solve this problem in the world are diffusion welding, but the cost of diffusion welding is very ...

AI Technical Summary

Problems solved by technology

At present, most of the methods to solve this problem in the world are diffusion welding, but the cost of diffusion welding is very high, and the effect is not ideal.

[0003] Laser-assisted thermocompression welding technology is a relatively new technology. At present, no one has specialized in the design and manufacture of equipment, such as the influence of the diameter of the roller and the width of the roller on the weld, and the interaction between the pressure of the roller and the output light rate of the laser. relationship etc.

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