Modeling method for serial double-wire submerged arc welding numerical simulation heat source model

Abstract

The invention discloses a modeling method for a serial double-wire submerged arc welding numerical simulation heat source model. The method comprises the steps that first, attenuation functions in the depth direction are added into double-ellipsoid heat source models, and the two double-ellipsoid heat source models are used for building a double-wire model, wherein the attenuation functions include a linear function, an exponential function and a quadratic function; second, parameters of the double-ellipsoid heat source models adopting different attenuation functions are subjected to finite element inversion to obtain corresponding simulated pool shapes; third, the goodness of fit between the simulated pool shapes and the actual pool shape serves as the standard for selecting the attenuation functions to obtain the optimal serial double-wire submerged arc welding numerical simulation heat source model. The attenuation functions in the depth direction are added into the double-ellipsoid heat source models, therefore, the heat source model can be well matched with an actual heat source in respects of welding depth and welding width, and the shape of a fusion line can be effectively controlled to some extent.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation heat source models for welding, and in particular relates to a modeling method for numerical simulation heat source models of tandem twin-wire submerged arc welding. Background technique [0002] As a high-efficiency welding method, submerged arc welding has greatly improved the production efficiency of welded components. Submerged arc welding can be divided into single-wire submerged arc welding and multi-wire submerged arc welding according to the number of welding wires. Compared with single-wire submerged arc welding, the double-wire submerged arc welding method has the following characteristics. The welding speed can be increased by 30% to 40%, the welding quality is good, the welding wire deposition rate and the current utilization rate are higher. It mainly includes multi-power tandem twin-wire submerged arc welding, single-power parallel twin-wire submerged arc welding, singl...

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Problems solved by technology

Most of the domestic and foreign studies on the numerical simulation of submerged arc welding use the double ellipsoid heat source model. There is a good match, but the shape of the fusion line cannot be effectively controlled

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