A precise control method for the microstructure of titanium alloy skin-stringer panel dual laser beam bilateral synchronous welding

Abstract

The invention relates to an accurate regulation and control method for a double-laser-beam double-side synchronous welding microstructure of a titanium alloy skin-stringer wall plate. By carrying outreal-time monitoring on the welding process to obtain the information of a plasma optical signal, and further feeding the information back to an information processing system to judge whether the heatinput needs to be adjusted, the purposes of controlling the grain size, the dendrite spacing and the like of different areas of a weld joint and a heat affected zone are achieved. According to the method, the plasma optical signal is recognized, then a matching relation between the thermal input and the microstructure feature information and the plasma optical signal is established, and an association database is formed. In the welding process, the plasma optical signal is identified and judged in real time, and when the intensity of the plasma optical signal does not meet the expected requirements, an adjusting scheme is made to adjust the thermal input. According to the method, the information of the plasma optical signal can be obtained in real time, and the thermal input adjusting scheme can be formulated to be timely and reasonably adjusted, so that the quality of a double-laser-beam double-side synchronous welding joint is improved.

Description

technical field [0001] The present invention relates to the technical field of laser welding, in particular to a method for precise regulation and control of the microstructure of double-sided simultaneous welding of titanium alloy skin-stringer panels, and in particular to an intelligent control technology for double-sided simultaneous welding of double-laser beams . Background technique [0002] With the development of my country's aviation industry, there is an urgent demand for lightweight aircraft structures. Titanium alloy skin-stringer structure, as an important lightweight structure, has a wide range of applications. Double laser beam bilateral simultaneous welding technology is a novel and unique laser welding process. Compared with the traditional T-shaped structure single-sided welding and double-sided forming process, this technology can effectively guarantee the surface integrity of the skin. At the same time, this project The technology has the advantages of ...

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Problems solved by technology

[0003] However, titanium alloys are very sensitive to welding process parameters. There are many interference factors and difficult quality monitoring in the process of dual laser beam bilateral simultaneous welding of titanium alloys, which leads to unstable weld quality and unsatisfactory welding results. Further Development of Laser Beam Bilateral Simultaneous Welding Technology in Manufacturing

The current dual laser beam bilateral synchronous welding equipment and process are all preset welding parameters. During the welding process, fixed welding parameters are used to obtain a uniform weld seam, and the grains in different areas of the weld seam and heat-affected zone cannot be controlled. degree and dendrite spacing, it is impossible to adjust the welding process parameters in real time according to the actual situation

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