Edge micro-plasma arc welding forming control method based on telecentric vision sensing

Abstract

The invention provides an edge micro-plasma arc welding forming control method based on telecentric vision sensing 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 monocular coaxial telecentric vision sensing system for acquisition of sharp front transient images of a molten pool, performs real-time adjustment on main arc current pulse modulation parameters on the bases of the front transient images of the molten pool and a mapping relation of multiple electric parameters and mushroom weld forming characteristic parameters in a welding process, and realizes accurate control of the edge micro-plasma arc welding mushroom weld forming. 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 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. The invention relates to an on-line control method for pulsed micro-beam plasma welding forming of thin-walled terminal joints based on telecentric vision sensing, which can be widely used in the pulsed micro-beam plasma welding process of thin-walled metal precision components in aerospace manufacturing and other fields. 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 manu...

AI Technical Summary

Problems solved by technology

[0006] In summary, most of the existing micro-beam plasma welding technologies at home and abroad only involve assembly positioning methods and fixture design, off-line optimization of welding process parameters, automatic welding bead tracking technology, and welding process methods suitable for thin-plate butt joints or specific workpieces. At present, there is no online control method for weld seam formation suitable for pulsed micro-beam plasma welding of thin-walled end joints

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