Flexible laser welding method and device used for skin-stringer

Abstract

The invention provides a flexible laser welding method and device used for a skin-stringer. The method comprises the steps that an off-line programming system obtains a welding seam track, a laser welding system obtains gap data of the welding seam track, and a pre-welding scanning system establishes a function relation between the gap width and the welding seam length; a central control system judges whether assembling conditions meet laser welding requirements or not; when the assembling conditions meet the laser welding requirements, a process planning system obtains related feature information and obtains a spot welding process scheme according to the related feature information and a model parameter database; and the laser welding system adopts pulse lasers to carry out spot welding in a welding area according to the spot welding process scheme, and a molten pool monitoring system observes and records the whole spot welding process in real time. According to the method and device, systematic step-by-step welding is carried out on space complex curve welding seams with the curvatures changing constantly at different positions, and the purposes of reducing the sensitivity of process parameters, avoiding the defects of incomplete penetration, welding leakage and the like, improving the stability of the welding process and improving the welding seam quality are achieved.

Description

technical field [0001] The invention relates to laser welding technology, in particular to a flexible laser welding method and device for skin-stringer. Background technique [0002] TC4 titanium alloy has the characteristics of low density, high specific strength, and excellent corrosion resistance. After heat treatment, it has good plasticity, high strength, and good comprehensive mechanical properties. It is widely used in the aerospace field. my country's aviation industry takes large-scale, lightweight, and complex development as the main development policy, and is in an unprecedented stage of vigorous development. Based on this realistic demand, the application of titanium alloy skin-stringer structures as an important lightweight structure is becoming more and more widely. Dual laser beam bilateral simultaneous welding technology has the advantages of high welding speed, low heat input and high energy density, and its low heat input can minimize deformation and reduce...

AI Technical Summary

Problems solved by technology

In addition, titanium alloy skin-stringer structures often appear in large thin-walled complex welded structural parts in the actual application process of the aviation industry. The weld trajectory is usually a complex curve in space and the welding distance is long. This poses a more serious challenge to how to achieve continuous and stable welding of thin-walled titanium alloy skin-long stringer space complex curve welds

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