Experiment study and regression analysis of molten pool in laser welding

Configuration of a molten pool is related to the laser welding quality. Analyzing the configuration of a molten pool is important to monitor the laser welding process. This paper proposes a method of segmentation of a molten pool and its shadow during high power disk laser welding, consequently provides the groundwork for reconstruction of the molten pool and analysis of welding quality. Subsection linear stretching histogram equalization was applied to enhance the contrast of the original images firstly, and then edge detection was used to highlight the edges. After that we used the morphology filtering method to produce the segmentation mask, and then combined the mask with the original images to get the final segmentation results. Also, the proposed method was compared with other traditional methods. The experimental results showed that our method not only could give better segmentation results and process large quantities images automatically, but also overcame the less-segmentation problems of traditional methods.

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Dynamic behavior of plasma and molten pool of pure titanium during hyperbaric laser welding

Infrared Physics & Technology ◽

10.1016/j.infrared.2021.103686 ◽

2021 ◽

Vol 115 ◽

pp. 103686

Author(s):

Jian Long ◽

Lin-Jie Zhang ◽

Jie Ning ◽

Suck-Joo Na

Keyword(s):

Laser Welding ◽

Dynamic Behavior ◽

Molten Pool ◽

Pure Titanium

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Characteristics of keyhole and molten pool during laser welding of TC4 Ti-alloy

Proceedings of the 36th International MATADOR Conference ◽

10.1007/978-1-84996-432-6_129 ◽

2010 ◽

pp. 591-594 ◽

Cited By ~ 4

Author(s):

Duan Aiqin ◽

Chen Li

Keyword(s):

Laser Welding ◽

Molten Pool ◽

Ti Alloy

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Effect of pulse frequency on laser welding on SiCp/6061 aluminum alloys with powder

Journal of Physics Conference Series ◽

10.1088/1742-6596/2079/1/012022 ◽

2021 ◽

Vol 2079 (1) ◽

pp. 012022

Author(s):

Yongchao Jian ◽

Yan Shi

Keyword(s):

Tensile Strength ◽

Aluminum Alloys ◽

Laser Welding ◽

Base Metal ◽

Welded Joints ◽

Molten Pool ◽

Particle Distribution ◽

Pulse Frequency ◽

Uneven Distribution

Abstract Because of the uneven distribution of reinforcement particles in the molten pool during laser welding of SiCp/6061Al composites with powder, the effect of pulse frequency on the homogenization was studied in this paper. The pulse frequency of welding is changed and the macro morphology of the weld is studied by metallographic microscope. The particle uniformity of reinforcing phase and the porosity of molten pool at different frequencies were compared. The tensile strength of welded joints at different frequencies was tested by universal tensile machine. Finally, when the pulse frequency is 160Hz, the particle distribution of reinforcing phase is the most uniform and the tensile strength is the largest. The tensile strength reaches 267.06MPa, reaching 69.1% of the base metal. When the pulse frequency is 320Hz, the porosity of the weld is the lowest, reaching 1.75%.

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