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.

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.

Real-time control of the rotation rate of a particle trapped in a focused laser beam

2001 ◽  
Author(s):  
M. A. Rakhmatulin ◽  
Svetlana P. Kotova ◽  
Vladimir G. Volostnikov
Keyword(s):  
Laser Beam ◽  
Real Time ◽  
Rotation Rate ◽  
Real Time Control ◽  
Time Control

New Application of Lap Laser Welding on Stainless Steel Railway Vehicles

2010 ◽  
Vol 44-47 ◽  
pp. 2578-2582 ◽  
Author(s):  
Hong Xiao Wang ◽  
Chun Sheng Wang ◽  
Chun Yuan Shi
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Laser Welding ◽  
Process Parameters ◽  
Laser Power ◽  
Spot Welding ◽  
Tensile Tests ◽  
Railway Vehicles ◽  
Optimization Of Process Parameters ◽  
Focal Position

Recently the problems of resistance spot welding (RSW) stainless steel railway vehicles are causing more attention for poor surface quality. Lap laser welding of stainless steel is investigated with OED(Orthogonal experimental designing ) in this study to replace RSW with the aim of to increase the aesthetics of the car body by eliminating visible indentation on the surface and the flatness of the skin reducing welding deformations. After welding tensile tests and microstructure analysis are performed. The optimization of process parameters were: laser power =2.5kW；welding speed=2.2m/min, focal position=0mm. The fusion zone is symmetrical about the axis of the laser beam and no welding cracks or porosity can be found in any of the welds. This work has great significance of improving the manufacturing level of stainless steel railway vehicles.

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

Real-Time Control of Laser Beam Welding Processes: Reality

2011 ◽  
pp. 261-281 ◽  
Author(s):  
Leonardo Nicolosi ◽  
Andreas Blug ◽  
Felix Abt ◽  
Ronald Tetzlaff ◽  
Heinrich Höfler ◽  
...  
Keyword(s):  
Laser Beam ◽  
Real Time ◽  
Laser Beam Welding ◽  
Real Time Control ◽  
Time Control ◽  
Welding Processes

A Real Time Control Architecture for Continuously Managing Patients in a Care Unit

1995 ◽  
Vol 34 (05) ◽  
pp. 475-488
Author(s):  
B. Seroussi ◽  
J. F. Boisvieux ◽  
V. Morice
Keyword(s):  
Real Time ◽  
Linear Time ◽  
Treatment Plan ◽  
Control Architecture ◽  
Real Time Control ◽  
Time Representation ◽  
Time Control ◽  
Continuous Support ◽  
Definition Of ◽  
Computerized System

Abstract:The monitoring and treatment of patients in a care unit is a complex task in which even the most experienced clinicians can make errors. A hemato-oncology department in which patients undergo chemotherapy asked for a computerized system able to provide intelligent and continuous support in this task. One issue in building such a system is the definition of a control architecture able to manage, in real time, a treatment plan containing prescriptions and protocols in which temporal constraints are expressed in various ways, that is, which supervises the treatment, including controlling the timely execution of prescriptions and suggesting modifications to the plan according to the patient’s evolving condition. The system to solve these issues, called SEPIA, has to manage the dynamic, processes involved in patient care. Its role is to generate, in real time, commands for the patient’s care (execution of tests, administration of drugs) from a plan, and to monitor the patient’s state so that it may propose actions updating the plan. The necessity of an explicit time representation is shown. We propose using a linear time structure towards the past, with precise and absolute dates, open towards the future, and with imprecise and relative dates. Temporal relative scales are introduced to facilitate knowledge representation and access.

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