Laser welding core parameter optimization method for improving welding seam strength of tailored blank laser welding

Abstract

The invention discloses a laser welding core parameter optimization method for improving the welding seam strength of a laser tailor-welded blank. The method comprises the following steps that a primary orthogonal test scheme is designed, and multiple tailor-welded test groups which respectively take a defocusing amount delta and an offset eta as variation parameters are set; a corresponding metallographic test and a weld cup drawing test are performed, and an influence rule of the values of the offset eta and the defocusing amount delta on the weld morphology and the weld strength is analyzed; a quadratic orthogonal test scheme and a corresponding welding seam cup drawing test are designed and implemented, an average cup drawing test value curve is drawn, and the value range of the defocusing amount delta and the value range of the offset eta when the cup drawing test value is larger than or equal to 10 mm are obtained. The method has the beneficial effects that the number of rounds of the orthogonal test can be greatly reduced, parameters for orthogonal test data are not set randomly any more, the test data are set in a relatively-small range according to the rule, and the number of times of the orthogonal test in the later period can be remarkably reduced by setting the test data in the mode.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a laser welding core parameter optimization method for improving the weld seam strength of a laser tailor welded blank. Background technique [0002] Tailored welded blank is a manufacturing technology developed by the modern automobile industry to adapt to the lightweight of automobiles. There are many factors that affect the seam quality (including weld strength) of laser tailor welded blanks, including the quality of the welded edges of the steel plates to be welded, the gap control between the steel plates to be welded during the tailor welding process, welding speed, laser incident angle, The power of the laser, the defocus of the laser on the steel plate to be welded, the offset between the laser focus and the center line of the weld, etc. At present, in the process of processing laser tailor welded blanks for automobile stamping in China, the adjustment of laser welding ...

AI Technical Summary

Problems solved by technology

For tailor-welded blanks with unequal thickness, adjusting these two parameters can only solve part of the quality problems of the weld

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