Edge micro-plasma arc welding forming control method based on identification of dynamical system

Abstract

The invention provides an edge micro-plasma arc welding forming control method based on identification of a dynamical system and belongs to the technical field of welding quality control. Aiming to solve the problems of unstable welding process and non-uniform weld forming caused by energy parameter fluctuation, heat dissipation condition change and the like in a thin-walled edge joint pulsed micro-plasma arc welding process, the method adopts a molten pool vision sensing technology for extraction of front transient image characteristics of a molten pool, adopts an Elman dynamical recurrent neural network for off-line system identification in the thin-walled edge joint pulsed micro-plasma arc welding dynamic process and realizes on-line control of mushroom weld forming in the thin-walled edge joint pulsed micro-plasma arc welding process through real-time adjustment of welding process parameters. The edge micro-plasma arc welding forming control method can improve the quality reliability of welded products and increase the one-time welding qualification rate, can be applied to an edge joint pulsed micro-plasma arc welding process for thin-walled metal precision components in the fields of aerospace manufacture and the like and is particularly applicable to precision welding occasions for elastic components such as ultra-thin-walled capsules, bellows and the like.

Description

technical field [0001] The invention belongs to the technical field of welding quality control, and relates to a method for controlling the formation of end-connected micro-beam plasma welding based on dynamic system off-line identification, which can be widely used in the process of end-connected micro-beam plasma welding of thin-walled metal precision components in aerospace manufacturing and other fields middle. Background technique [0002] Thin-walled metal precision components are an indispensable and important component in high-end equipment manufacturing fields such as aerospace, military weapons, nuclear industry, medical equipment and biomedicine, and have strict requirements on weld quality and joint mechanical properties. Pulsed Micro-plasma Arc Welding (P-MPAW, Pulsed Micro-plasma Arc Welding) has the advantages of concentrated energy density, narrow heat-affected zone, high arc stability and precise control of heat input. An important welding and forming manuf...

AI Technical Summary

Problems solved by technology

[0006] To sum up, most of the domestic and foreign research on micro-beam plasma welding technology only involves assembly positioning methods and fixture design, off-line optimization of welding process parameters, automatic welding bead tracking technology, and welding processes suitable for thin-plate butt joints or specific workpieces. At present, there is no online control method for weld seam formation suitable for micro-beam plasma welding of thin-walled end joints.

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