Steel-aluminum laser welding technique optimizing method

Abstract

The invention discloses a steel-aluminum laser welding technique optimizing method. The steel-aluminum laser welding process is simulated through finite element analysis software SYSWELD, and a steel-aluminum dissimilar metal laser welding temperature field distribution cloud picture, the weld penetration depth and the weld width are obtained. The mapping relation between laser technique parameters and the weld penetration depths and the weld widths is built through the Taguchi experiment and a response surface method, accordingly, the weld penetration depths and the weld widths under the different technique parameters are predicted, the ideal weld penetration depth is obtained under the condition that the good weld formability is comprehensively considered, and thus the optimal laser welding technique parameters are obtained. The steel-aluminum laser welding technique optimizing method is applied to selecting of the steel-aluminum laser welding technique parameters, the difficulty that the steel-aluminum laser welding technique parameters have to be selected by means of rich experience of workers and a large number of experiments is overcome, thus, the large quantity of time and consumed materials are saved, selection of the technical parameters is easier and more reliable, the production efficiency is improved, and the production cost is saved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a process optimization method for steel / aluminum laser welding. Background technique [0002] The lightweight of the body plays a pivotal role in the lightweight of the vehicle, and it is one of the most effective means to improve the fuel economy of the vehicle and reduce harmful emissions. The steel / aluminum mixed material body adopts the method of combining material replacement and structural improvement, which is completely in line with the development technology route of lightweight body. However, its application is still in its infancy. Steel / aluminum laser welding is an extremely complicated process. At present, there is no uniform regulation for the evaluation of steel / aluminum welding quality, and there are many parameters to measure weld quality, such as penetration depth and fusion width. etc. are important parameters to measure the quality of the weld. However, each...

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Problems solved by technology

However, its application is still in its infancy. Steel / aluminum laser welding is an extremely complicated process. At present, there is no unified regulation for the evaluation of steel / aluminum welding quality, and there are many parameters to measure weld quality, such as penetration depth and fusion width. etc. are important parameters to measure the quality of the weld. However, each process parameter has an extremely important impact on the penetration depth and fusion width. However, it is difficult to directly give the process parameters and penetration depth and fusion width in the steel / aluminum laser welding process at the same time. Therefore, it greatly increases the difficulty of formulating the steel / aluminum laser welding process

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