Mechanism of laser welding, Mechanical Engineering

MECHANISM OF LASER WELDING

 

Laser welding of metals is performed with beams focused to irradiate levels in the range of 106 to 107 W / cm2. At such power densities, melting occurs in less than a millisecond. First, the radiation pressure becomes appreciable capable of supporting 0.5 mm liquid steel column. Next, the molten liquid has an appreciable vapour pressure. The metal vapour, now interacts with light through the process of inverse population, where electrons in the field of an ion may be accelerated by electromagnetic radiation. This heats the vapour, increasing the number of ions and hence the absorption. Now the plasma, which is a highly ionised gas that absorbs laser light and emits back body radiation. As long as power density is sufficient to sustain it the plasma will act as an efficient absorber.

Posted Date: 9/17/2012 8:09:39 AM | Location : United States







Related Discussions:- Mechanism of laser welding, Assignment Help, Ask Question on Mechanism of laser welding, Get Answer, Expert's Help, Mechanism of laser welding Discussions

Write discussion on Mechanism of laser welding
Your posts are moderated
Related Questions
where expendable pattern is used?

Problems on Structural Design of Combined Footings a. Two columns 50 cm x 50 cm in size support service loads of 1200kN and 800kN.The centre to centre spacing between columns

Collapsible Soils and Subsidence There are soils which are quite stable when dry and they show large volume changes on wetting under load. Examples of  these soils are loess (w

Define Trunnion Jig These jigs are used for drilling holes on very large or odd. 1. Figure shows the shaped parts from different sides. Figure: Trunnion

An oil engine works on the Dual cycle, the heat liberated at consent pressure being twice that liberated at consent volume. The compression ratio of the engine is 8 and the expansi

POWER SOURCES FOR ARC WELDING Electric arc welding processes constitute a majority of all the welding processes. Most of the weldable materials can be joined by arc welding. D

Problem s on Cantilever Truss: In the case of cantilever trusses, it is not required to determine the support reactions. The forces in members of cantilever truss are obtaine

Relationships among VM, Virtual Prototyping, the Virtual Enterprise Virtual Manufacturing (VM) VM is a synthetic, integrated manufacturing environment exercised to improve

What us the duff between direct stress and bending stress

A bank has only one typist since the typing work varies in length (Number of pages to be typed). The typing rate is randomly distributed approximating a Poisson Distribution with m