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.

Process Parameters Control of Deposition of Hollow Cylindrical Part with Internal Wire Feeding through a Hollow Laser Beam

2013 ◽  
Vol 419 ◽  
pp. 305-309 ◽  
Author(s):  
Ming Jun Wu ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Yu Liu
Keyword(s):  
Laser Beam ◽  
Process Parameters ◽  
Cylindrical Part ◽  
Uneven Surface ◽  
Real Time Control ◽  
Time Control ◽  
Optimization Of Process Parameters ◽  
Wire Feeding ◽  
Formed Part ◽  
Hollow Laser Beam

A new inside-laser coaxial wire feeding processing is adopted that can ensure a good axiality between wire and laser beam through transmitting wire along the centerline of the laser beam. Basing on the optimization of process parameters and single beads cladding experiments, the causes of the uneven surface of the formed part is analyzed. By putting forward a method of the real-time control of the defocusing amount and the laser power, a fine multi-layer hollow rotary part is formed. The formed part has no subsidence damage and crack on the whole cladding layer. The size of the error is small and the hardness of the laser cladding is uniformly distributed.

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

Review and Prospect of the Influence of Laser Cladding Process Parameters on the Properties of Die Cladding Layer

2020 ◽  
Vol 990 ◽  
pp. 67-72 ◽  
Author(s):  
Bin Han ◽  
Hui Wang ◽  
Jia Yi Lin ◽  
Xi Hao Liu
Keyword(s):  
Laser Cladding ◽  
Process Parameters ◽  
Laser Power ◽  
High Hardness ◽  
Scanning Speed ◽  
Production Costs ◽  
High Wear Resistance ◽  
Cladding Layer ◽  
Laser Cladding Process ◽  
Development Direction

Laser cladding technology is widely used in the surface modification of parts due to its excellent properties such as high hardness, high wear resistance and corrosion resistance. Extends the life of these parts under normal use conditions, greatly reducing production costs. In this paper, the influence of different parameters such as laser cladding process parameters—laser power and scanning speed, and their interaction on the performance of mold cladding layer is discussed, and the future development direction of laser cladding technology in mold is prospected.

Effect of Process Parameters on Quality of Ti-6Al-4V Multi-Layer Single Pass Wall during Direct Laser Deposition with Beam Oscillation

2020 ◽  
Vol 299 ◽  
pp. 716-722 ◽  
Author(s):  
S.A. Shalnova ◽  
O.G. Klimova-Korsmik ◽  
G.A. Turichin ◽  
M.O. Gushchina
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Oscillation Amplitude ◽  
Tensile Tests ◽  
Laser Deposition ◽  
Uniaxial Tensile ◽  
X Ray Diffraction ◽  
Direct Laser Deposition ◽  
Direct Laser

In this paper, the effect of process parameters on quality of fabricated wall, the phase composition, microhardness, and mechanical properties of the Ti-6Al-4V titanium sample, obtained by direct laser deposition, was considered. To determine the characteristics of the samples the X-ray diffraction, scanning electron microscopy, Vickers microhardness measurements, and uniaxial tensile tests were used. It is shown that the process parameters with the same speed, oscillation amplitude and peak value of heat flux have a similar wall thickness but different waviness with high mechanical properties.

Numerical Simulation on Temperature Field in Multi-Layers Inside-Beam Powder Feeding when Laser Cladding

2012 ◽  
Vol 499 ◽  
pp. 114-119 ◽  
Author(s):  
Ming Di Wang ◽  
Shi Hong Shi ◽  
X.B. Liu ◽  
Cheng Fa Song ◽  
Li Ning Sun
Keyword(s):  
Numerical Simulation ◽  
Heat Source ◽  
Laser Beam ◽  
Cooling Rate ◽  
Light Source ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Initial Conditions ◽  
Cladding Layer ◽  
Powder Feeding

Numerical simulation of laser cladding is the main research topics for many universities and academes, but all researchers used the Gaussian laser light source. Due to using inside-beam powder feeding for laser cladding, the laser is dispersed by the cone-shaped mirror, and then be focused by the annular mirror, the laser can be assumed as the light source of uniform intensity.In this paper,the temperature of powder during landing selected as the initial conditions, and adopting the life-and-death unit method, the moving point heat source and the uniform heat source are realized. In the thickness direction, using the small melt layer stacking method, a finite element model has been established, and layer unit is acted layer by layer, then a virtual reality laser cladding manu-facturing process is simulated. Calculated results show that the surface temperature of the cladding layer depends on the laser scanning speed, powder feed rate, defocus distance. As cladding layers increases, due to the heat conduction into the base too late, bath temperature will gradually increase. The highest temperature is not at the laser beam, but at the later point of the laser beam. In the clad-ding process, the temperature cooling rate of the cladding layer in high temperature section is great, and in the low-temperature, cooling rate is relatively small. These conclusions are also similar with the normal laser cladding. Finally, some experiments validate the simulation results. The trends of simulating temperature are fit to the actual temperature, and the temperature gradient can also ex-plain the actual shape of cross-section.

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