Control method for asymmetrical fillet weld joint melting form and melting depth

Abstract

The invention discloses a control method for asymmetrical fillet weld joint melting form and melting depth. Melting forming of an asymmetrical fillet weld joint is controlled by adjusting the weldinggun angle, a front melting pool model is identified on the basis of a vision method, melting depth estimation and control are achieved, and due to the fact that the heat dissipation difference of twoside plates of an asymmetrical structure is large, melting forming of the two sides is difficult to control. The control method comprises the steps that on one hand, the melting pool form is controlled by controlling the welding gun angle, on the other hand, a finite-size fillet weld joint workpiece temperature field analytical model is derived on the basis of an instantaneous point heat source temperature field analytical equation of an infinite-body green function and a heat source equivalent method, melting pool edge feature points are obtained by means of image treatment to correct the analytical model, numerical calculation is conducted through the corrected analytical model, the maximum coordinate of the melting point temperature in the depth direction is solved, and then melting depth calculating and solving can be achieved. Through the method, control over melting forming of the asymmetrical fillet weld joint can be achieved, and the purpose of improving the welding quality ofthe special structure is achieved.

Description

technical field [0001] The invention belongs to the field of welding automation, and mainly relates to a method for controlling the penetration form and penetration depth of an asymmetric fillet weld, that is, a method for separately controlling the form of a molten pool and the penetration depth to ensure the welding quality of an asymmetric fillet weld method. Specifically, the shape of the molten pool at the weld is affected by changing the angle of the welding torch, and the penetration depth is estimated through the three-dimensional temperature field analytical model corrected by the image information of the front molten pool. The combination of the two realizes the penetration forming control. Background technique [0002] At present, there are many asymmetric fillet welds with different thicknesses in the aircraft body, engine container and other parts. The heat dissipation of such welds is significantly different from that of symmetrical welds, which affects the wel...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a method for controlling the penetration shape and penetration depth of an asymmetric fillet weld. Penetration Quality Control Aspects of Seam Welding

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