May 2021

Article Contents

Chinese Optics> 2021> 14(3): 652-660.

HUANG Zhi-yi, WANG Chun-sheng, HE Shuai, GU Xiao-peng, DONG Juan, XU Guo-cheng. Improvement of the ultrasonic testing accuracy of laser welding fusion width[J]. Chinese Optics, 2021, 14(3): 652-660. doi: 10.37188/CO.2020-0149

Citation:

HUANG Zhi-yi, WANG Chun-sheng, HE Shuai, GU Xiao-peng, DONG Juan, XU Guo-cheng. Improvement of the ultrasonic testing accuracy of laser welding fusion width[J].Chinese Optics, 2021, 14(3): 652-660.doi:10.37188/CO.2020-0149

Citation:

HUANG Zhi-yi, WANG Chun-sheng, HE Shuai, GU Xiao-peng, DONG Juan, XU Guo-cheng. Improvement of the ultrasonic testing accuracy of laser welding fusion width[J].Chinese Optics, 2021, 14(3): 652-660.doi:10.37188/CO.2020-0149

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Improvement of the ultrasonic testing accuracy of laser welding fusion width

doi:10.37188/CO.2020-0149

1.
Engineering Planning and Development Department, Engineering Technology Center, CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130000, China
2.
Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences, Changchun 130033, China
3.
College of Materials Science and Engineering, Jilin University, Changchun 130022, China

Funds:Supported by Science and Technology Development Plan of Jilin Province (No. 20190302044GX); Changchun Science and Technology Plan (No.18SS016)

More Information

Corresponding author:dongjuan@jlu.edu.cn
Received Date:24 Aug 2020
Rev Recd Date:20 Oct 2020

Available Online:05 Feb 2021

Publish Date:14 May 2021

Abstract

Abstract

Due to the tiny dimensions of lap laser welding joints, there is significant error in weld width detection when using the traditional 6 dB method. In order to improve the method’s detection accuracy and study its source of error, the finite element analysis method is used to analyze the propagation law of incident ultrasonic waves and reflected ultrasonic echo characteristics inside a laser-welded joint. Based on a modified 6 dB method, a laser welding joint melt width evaluation model is constructed and verified through physical experiments. The experimental results show that the primary echo amplitude of the bottom surface of the upper plate can be used as a characteristic value that reflects the internal structure of the joint. When the center of the probe corresponds to the edge of the weld fusion line inside the joint, the attenuation of the primary echo amplitude varies with the thickness of the upper plate, and the traditional 6 dB method can be modified according to the attenuation degree which related to the upper plate’s thickness. Based on this, the effective weld width at the contact surface of the inner plate of the joint can be calculated quantitatively. The ultrasonic testing results of the actual laser welding joints confirmed that the melt width of the laser welding joints obtained by the modified 6 dB method agree with the results of the physical experiments, which means that this provides a very practical method for accurate ultrasonic testing of laser welding joints in real-world production.
- laser lap welding,
- ultrasonic testing,
- finite element analysis,
- modified 6 dB method

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References (22)

References

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