Method for obtaining finite element simulation heat source model of deep penetration welding

Abstract

The invention discloses a method for obtaining a finite element simulation heat source model of deep penetration welding. The method is used for obtaining a heat source model corresponding to a weld joint of a high-melting deep-locking process welding sample. The method comprises the following steps of (S1) obtaining an image of a weld joint section, wherein the weld joint section comprises a non-passivation region and a passivation region; (S2) obtaining size parameters of the non-passivation region and the passivation region; (S3) fitting a side curve of the non-passivation region; and (S4)according to results of the steps (S2) and (S3), determining an expression of an effective action radius of a heat source, and building a rotator heat source model. According to the method, the rotator heat source is adopted to perform modeling on the heat source of the deep penetration welding, so that the actual situation of the deep penetration welding is better met. The heat source model is asingle-function heat source model, so that the problem of matching of multiple models does not exist; and the definition of the heat source model can be realized only by inputting geometric dimensiondata related to the weld joint. Compared with a combined heat source, the heat source model has the self-evident advantages.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a method for obtaining a finite element simulation heat source model of deep penetration welding. Background technique [0002] The high penetration lock welding process is a high-efficiency, high-quality and large-penetration welding process developed from the Tig welding process. The current used is much larger than that of the general Tig welding process. Its single-pass penetration capability is far superior to traditional Mig welding and Tig welding processes. Therefore, it can realize the welding of metal materials on the basis of not opening a groove. [0003] Due to its process characteristics, its welding heat source performance is different from traditional welding heat sources. In finite element simulation, traditional Mig welding and Tig welding use heat source models such as ellipsoid, Gaussian, and double ellipsoid. However, these models are mainly aimed at the ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a finite element simulation heat source model acquisition method of deep penetration welding, which adopts a rotating body heat source to model the heat source of deep penetration welding, and solves the heat source models such as double ellipsoid and Gauss in the prior art existing problems

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