Numerical simulation and experimental investigation of gas-powder flow feed behavior in laser cladding with coaxial nozzle

被引：12

作者：

Chu, Mengya ^{[1
]}

Lian, Guofu ^{[1
]}

Yao, Mingpu ^{[2
]}

Feng, Meiyan ^{[1
]}

Chen, Changrong ^{[1
]}

Huang, Xu ^{[1
]}

机构：

[1] Fujian Univ Technol, Sch Mech & Automot Engn, Fuzhou 350118, Fujian, Peoples R China

[2] Southern Methodist Univ, Res Ctr Adv Mfg, Lyle Sch Engn, 3101 Dyer St, Dallas, TX 75205 USA

来源：

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | 2022年 / 122卷 / 02期

关键词：

Laser cladding; Coaxial powder-feeding nozzle; Gas-powder two-phase flow; Powder utilization rate; Numerical simulation;

D O I：

10.1007/s00170-022-09768-y

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The utilization of powders is the main factor determining the cost of laser-cladding industrial applications. The work established a 3D numerical model of gas-powder two-phase flow in the coaxial powder-feeding process to understand the gas-powder flow stream characteristics and improve the utilization of powders and the forming efficiency. The verified model was used to analyze the influences of the distance between the nozzle and substrate, carrier-gas flow rate, and powder feeding voltage on powders' concentration on the substrate, cladding morphology, and powders' utilization efficiency. The results showed that 9.5 mm was the optimal working distance of the nozzle, with the highest powder concentration on the substrate and the highest powder utilization rate. Appropriately increasing the gas flow rate was conducive to gathering powder particles; however, the increased gas flow rate aggravated particles to spray outwards and reduced the powder concentration on the substrate. After powder-feeding gas flow rate GF = 8 NL/min, the focused powder diameter no longer decreased. At this time, the cladding area was the maximum with the highest utilization rate of powders. As the powder feeding voltage increased, the cladding area and the utilization rate of powders increased. This model can accurately predict the transportation and concentration of powders on the substrate, which provides theoretical guidance for efficient forming by laser cladding.

引用

页码：881 / 894

页数：14

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