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Weld joint toughness evaluation method

An evaluation method and toughness technology, which is applied in the field of weld toughness evaluation, can solve the problems of low accuracy and achieve the effects of improving accuracy, improving evaluation efficiency, and shortening the evaluation cycle

Pending Publication Date: 2022-04-05
VOYAH AUTOMOBILE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the detection process of this method relies heavily on the rich experience and subjective judgment awareness of the inspectors, and the difference in the metallographic structure of the weld is very small.

Method used

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  • Weld joint toughness evaluation method

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Embodiment Construction

[0048] see figure 1 , is a schematic flow chart of a method for evaluating the toughness of a weld 210 provided in the embodiment of the present application, which may specifically include:

[0049] S110, obtaining the test sample 200;

[0050] Specifically, the material of this application is a thermoformed tailor-welded blank, and a test sample 200 is obtained from the thermoformed tailor-welded blank, and the test sample 200 includes a weld 210;

[0051] S120, performing an impact test on the position of the weld 210 of the sample 200;

[0052] Specifically, the sample 200 is placed on a testing machine, and an impact test is performed on the position of the weld 210 of the sample 200. The testing machine can be a pendulum impact testing machine. The testing range of the pendulum impact testing machine is 25J and 50J, and the pendulum impact testing machine with a testing range of 50J can be used for tough materials.

[0053] Exemplarily, the testing machine can be a zwi...

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Abstract

The invention relates to the technical field of weld joint toughness, in particular to a weld joint toughness evaluation method which comprises the following steps: acquiring a test sample; performing an impact test on the weld joint position of the sample piece; acquiring an impact load-displacement curve of the sample piece according to the impact test data; and determining the ductile-brittle state of the sample piece according to the impact load-displacement curve, and evaluating the toughness degree of the welding seam according to the welding seam impact absorption energy of the sample piece under the condition that the sample piece is in a ductile state. The evaluation accuracy is improved, the subsequent passing of the whole vehicle real object verification is avoided, the whole evaluation period is shortened, the evaluation efficiency is improved, and the cost is saved.

Description

technical field [0001] This specification relates to the technical field of weld toughness, and more specifically, the present invention relates to a method for evaluating weld toughness. Background technique [0002] Thermoformed laser tailor welded blanks need to be hot stamped before they can become auto parts. The thermal cycle of the tailor welding process and the hot stamping process increase the internal stress of the steel plate, which will further reduce the toughness of the weld. The welding heat cycle experienced by the weld and the internal stress caused by stamping are the main reasons for the decrease in the toughness of the weld, which adversely affects the performance of the car. Therefore, it is necessary to evaluate the toughness performance of the weld under impact load to judge whether the weld meets the requirements of the automobile. [0003] The existing technical solution is to conduct qualitative evaluation by using the difference of metallographic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/30G01N1/44G01N1/28
Inventor 祁学军张永仁陈嘉玥许梦绮曹卫林
Owner VOYAH AUTOMOBILE TECH CO LTD
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