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Quality detection of laser additive manufacturing process based on coaxial vision monitoring

Bo Chen (State key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang, China and School of Materials Science and Engineering, Harbin Institute of Technology - Weihai, Weihai, Shandong, China)
Yongzhen Yao (School of Materials Science and Engineering, Harbin Institute of Technology - Weihai, Weihai, Shandong, China)
Yuhua Huang (School of Materials Science and Engineering, Harbin Institute of Technology - Weihai, Weihai, Shandong, China)
Wenkang Wang (School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology - Weihai, Weihai, Shandong, China)
Caiwang Tan (State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang, China)
Jicai Feng (State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, Heilongjiang, China)

Sensor Review

ISSN: 0260-2288

Article publication date: 26 July 2019

Issue publication date: 26 July 2019

Abstract

Purpose

This paper aims to explore the influences of different process parameters, including laser power, scanning speed, defocusing distance and scanning mode, on the shape features of molten pool and, based on the obtained relationship, realize the diagnosis of forming defects during the process.

Design/methodology/approach

Molten pool was captured on-line based on a coaxial CCD camera mounted on the welding head, then image processing algorithms were developed to obtain melt pool features that could reflect the forming status, and it suggested that the molten pool area was the most sensitive characteristic. The influence of the processing parameters such as laser power, traverse speed, powder feed rate, defocusing distance and the melt pool area was studied, and then the melt pool area was used as the characteristic to detect the forming defects during the cladding and additive manufacturing process.

Findings

The influences of different process parameters on molten pool area were explored. Based on the relationship, different types of defects were accurately detected through analyzing the relationship between the molten pool area and time.

Originality/value

The findings would be helpful for the quality control of laser additive manufacturing.

Keywords

Acknowledgements

This work was supported by the National Key R&D Program of China, China under the Grant (No. 2018YFB1107900), Shandong Provincial Natural Science Foundation, China under the Grant (No.ZR2017MEE042), Shandong Provincial Key Research and Development Program, China under the Grant (No. 2018GGX103026). The authors would like to thank the editor and the anonymous reviewer for their careful review and constructive comments on the earlier version of this article.

Citation

Chen, B., Yao, Y., Huang, Y., Wang, W., Tan, C. and Feng, J. (2019), "Quality detection of laser additive manufacturing process based on coaxial vision monitoring", Sensor Review, Vol. 39 No. 4, pp. 512-521. https://doi.org/10.1108/SR-03-2018-0068

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited