Process Research of Laser Variable-Spot Overlap Cladding Based on Inside-Laser Coaxial Powder Feeding

2012 ◽  
Vol 566 ◽  
pp. 556-559
Author(s):  
Fei Cao ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Yi Shao Zhang ◽  
Ji Li
Keyword(s):  
Laser Beam ◽  
Rapid Prototyping ◽  
Laser Cladding ◽  
Theoretical Basis ◽  
Process Research ◽  
Beam Power ◽  
Central Section ◽  
Novel Device ◽  
Step Effect ◽  
Hollow Laser Beam

Analyze the contradiction of laser cladding rapid prototyping between cladding efficiency and cladding precision, this paper advanced laser variable-spot cladding process with small facula outlining border of workpiece and big facula filling in central section of workpiece in order to improve the influence of “Step effect”. Based on the patent technology of “Hollow laser beam and internal power feeding”, the experiments of laser variable-spot overlap cladding are carried out on the substrate of 45# steel with a novel device of coaxial inside-beam power feeding. The experimental results were analyzed to provide a theoretical basis for the promotion and application of laser variable -spot overlap cladding.

Laser Cladding Forming of Cantilevered Thin-Walled Part Based on Hollow-Laser Beam Inside Powder Feeding Technology2

2015 ◽  
Vol 42 (10) ◽  
pp. 1003003
Author(s):  
石拓 Shi Tuo ◽  
王伊卿 Wang Yiqing ◽  
卢秉恒 Lu Bingheng ◽  
石世宏 Shi Shihong ◽  
陆斌 Lu Bing ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Thin Walled ◽  
Hollow Laser Beam ◽  
Powder Feeding

scholarly journals Microstructure and Mechanical Properties of the ((CoCrFeNi)95Nb5)100−xMox High-Entropy Alloy Coating Fabricated under Different Laser Power

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1477
Author(s):  
Wenrui Wang ◽  
Qi Sun ◽  
Dingzhi Wang ◽  
Junsong Hou ◽  
Wu Qi ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Volume Fraction ◽  
Beam Power ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Laser Cladding Process ◽  
Laser Beam Power ◽  
Interdendritic Phase ◽  
Dendritic Structures

In this paper, the ((CoCrFeNi)95Nb5)100−xMox (x = 1, 1.5 and 2) high-entropy alloy (HEA) coatings were fabricated on the substrate of 45# steel by laser cladding process under different laser beam power. The influence of laser beam power and molybdenum element content on the microstructure and microhardness of the HEA coatings was investigated. Results show that the HEA coatings were composed of face-centered cubic (FCC) phase and Laves phase, had low porosity, and bonded well to the substrate. The Mo1 coating is composed of cellular dendritic structures and columnar dendritic structures. With the increase of molybdenum element content, the columnar dendritic structures disappeared, the grains are refined, and the arrangement of grains is more compact. The volume fraction of the interdendritic phase under the laser beam power of 800 W was small and irregular. After the laser beam power was increased to 1000 W, the volume fraction of the interdendritic phase was increased. Under the laser beam power of 1200 W, the volume fraction of the interdendritic phase was small again. Therefore, the coatings fabricated under the laser beam power of 1000 W had a larger volume fraction of the interdendritic phase and higher microhardness. With the increase in molybdenum content, the grain changed from columnar dendrite to cellular dendrite, and the microhardness of the coating increased. The characteristics of the laser cladding process, the formation of Laves phase, and the fine grain strengthening lead to high microhardness of the coatings.

Realization and Research of Laser Cladding with Method of Internal Wire Feeding through a Hollow Laser Beam

2010 ◽  
Vol 37 (1) ◽  
pp. 266-270 ◽  
Author(s):  
石世宏 Shi Shihong ◽  
傅戈雁 Fu Geyan ◽  
李龙 Li Long ◽  
王永康 Wang Yongkang
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Wire Feeding ◽  
Hollow Laser Beam

Laser cladding forming of fan-shaped part based on hollow laser beam inside powder feeding technology

2017 ◽  
Vol 46 (9) ◽  
pp. 906007 ◽  
Author(s):  
周 斌 Zhou Bin ◽  
石世宏 Shi Shihong ◽  
邓志强 Deng Zhiqiang ◽  
石 拓 Shi Tuo ◽  
傅戈雁 Fu Geyan ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Shaped Part ◽  
Hollow Laser Beam ◽  
Feeding Technology ◽  
Powder Feeding

Temperature Field Numerical Simulation of Screwy Thin-Walled Part Cladded by Hollow Laser Beam

2013 ◽  
Vol 779-780 ◽  
pp. 410-413
Author(s):  
Hao Lin ◽  
Shi Hong Shi
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Laser Beam ◽  
Laser Cladding ◽  
Molten Pool ◽  
Laser Power ◽  
Forming Process ◽  
Single Laser ◽  
Thin Walled ◽  
Hollow Laser Beam

A numerical simulation model of laser cladding based on internal powder feeding through a hollow laser beam is set up by the Ansys Parametric Design Language (APDL). Through analyzing this model, the saddle-shaped distribution of energy absorbed in scanning direction is found and the molten pool temperature field of single laser cladding is observed like a comet[. Base on the single laser cladding experiments, the initial parameters and test plans of laser cladding and the screwy thin-walled part forming are confirmed. The finite element model of laser cladding forming screwy thin-walled part is established. The evolution of temperature field and thermal cycle of the nodes are studied during the screwy thin-walled part forming process. In the emulation laser power is controlled real time according to the analyses above, and the changing value of laser power is obtained to keep the molten pool temperature steady. The screwy thin-walled part is formed successfully based on these data.

Study on Technics in Laser Accumulation of Change-Diametral Rotary Parts with the Coaxial Inside-Beam Powder Feeding

2012 ◽  
Vol 510 ◽  
pp. 340-344
Author(s):  
Shi Hong Shi ◽  
Hong Yuan Li ◽  
Ge Yan Fu ◽  
Chen Wang ◽  
Hou Shun Sun
Keyword(s):  
Laser Beam ◽  
Laser Power ◽  
Novel Device ◽  
Forming Technology ◽  
Rotary Parts ◽  
Forming Characteristics ◽  
Bottom To Top ◽  
Hollow Laser Beam ◽  
Powder Feeding

Based on the forming technology of "hollow laser beam and internal powder, adopting a novel device with coaxial inside-beam and internal powder feeding, the accumulation experiments of the change-diametral rotary parts are carried out on the substrate of 45# steel. This study is focused on the control of the parts inclination angle, Z axis incremental and laser power on the forming characteristics of the parts. The results show that with the Coaxial Inside-beam Powder Feeding Accumulation, the quality of molding parts that this experiment gets finally is higher with smooth appearance and lower roughness. The grain is fine and the microstructure distribute uniformly from bottom to top of forming parts.

Research on the Key Process Parameters in Direct Laser Deposition Using Coaxial Inside-Beam Wire Feeding

2010 ◽  
Vol 43 ◽  
pp. 401-404 ◽  
Author(s):  
Yong Kang Wang ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Chun Sheng Li
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Process Parameters ◽  
Laser Deposition ◽  
Direct Laser Deposition ◽  
Cladding Layer ◽  
Laser Cladding Process ◽  
Direct Laser ◽  
Wire Feeding ◽  
Hollow Laser Beam

Aimed at the disadvantages of the lateral wire feeding in direct laser deposition (DLD), a novel device with coaxial inside-beam wire feeding is applied in the process based on the patent technology of “hollow laser beam and internal wire feeding’’. During the laser cladding process, laser beam can be coupled with wire accurately. The comparison experiments of laser cladding are carried out on the substrate of 45# steel with different process parameters. The effects of crucial process parameters, such as laser power, scanning speed and wire delivery rate on the cladding layer are dicussed. The optimum laser cladding process and related parameters are obtained. Microstructure of the cladding layer is characterized by scanning electron microscopy (SEM). Experimental results show that, wire melts adequately; the cladding layer is symmetrical and smooth; the microstructure is uniformly distributed with no porosity; firm combination with substrate is achieved.

Temperature Field Numerical Simulation of Laser Cladding Based on Internal Powder Feeding through a Hollow Laser Beam

2012 ◽  
Vol 39 (3) ◽  
pp. 0303002 ◽  
Author(s):  
石世宏 Shi Shihong ◽  
王晨 Wang Chen ◽  
徐爱琴 Xu Aiqin ◽  
孙后顺 Sun Houshun ◽  
李洪远 Li Hongyuan
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Laser Beam ◽  
Laser Cladding ◽  
Hollow Laser Beam ◽  
Powder Feeding
Sign in / Sign up

Export Citation Format

Share Document