Coupling Rules Between Broadband Beam and Coaxial Powder Flow and Forming Characteristics of Cladding

doi:10.11933/j.issn.1007-9289.20170331003

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China Surface Engineering ›› 2017, Vol. 30 ›› Issue (5) : 141-149. DOI: 10.11933/j.issn.1007-9289.20170331003

ZHANG Jian, ZHANG Jin-chao, PAN Xiao-ming, CAO Yu and FENG Ai-xin

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High-power and broadband-flat laser beam was applied for cladding experiments. Using high-speed camera and image processing software, a coupling model of broadband beam and coaxial powder flow was built to investigate coupling rules with different disk revolutions and carrier gas flows. The whole process was characterized by metallographic microscope and stereo microscope. The results show that, when the carrier gas flow is kept the same, with the increase of the disk revolution, the coupling position of the laser beam and powder flow gradually changes from the inside to the outside of the broadband beam.The focal length of the powder confluence point becomes larger at first, and then remain unchanged as well as the diameter. The geometry of the base area changes from the focus-powder spot to the ring-powder spot, and the width of the cladding layer slightly decreases, while the height and contact angle increase. In this condition, the powder using efficiency first increases then decreases, and the dilution rate is reduced. When the disk revolution is kept the same, the coupling position of the laser beam and powder flow was unchanged with the increase of the carrier gas flow. Powder flow is located outside of the broadband beam. Focal length of aggregation point of powder first increases and then decreases. Diameter increases first and then remains the same. Base area is from the ring-powder spot to the focus-powder spot. Width of cladding layer first increases and then decreases. Height and contact angle increase first and then remain the same. Powder using efficiency first increases then decreases, and the dilution rate is reduced. The best performance can be achieved when the disk revolution is 1.2 r/min, and the carrier gas flow is 4 L/min.

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laser cladding;flat-topped laser beam;powder flow;cladding layer

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ZHANG Jian, ZHANG Jin-chao, PAN Xiao-ming, CAO Yu and FENG Ai-xin. Coupling Rules Between Broadband Beam and Coaxial Powder Flow and Forming Characteristics of Cladding[J]. China Surface Engineering, 2017, 30(5): 141-149 https://doi.org/10.11933/j.issn.1007-9289.20170331003

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2023-12-19

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