Laser beam welding:
- Atoms are pumped into a closed container using xenon lamp to high energy levelThis high energy atoms
- releases the energy in the form of photons through the reflecting
- Surfaces that receive large amount of light rays, which come with different phases, with different wavelengths convert into a single monochromatic coherent light rays. This is focused onto the workpiece at a given point by using optical focusing lens.
- Due to high energy of the laser which are focused on the work piece heat generation is maximum and depth of penetration is maximum
- When compared to electron beam welding heat concentration of the workpiece is less
- It will be used for welding of low melting point, material more accurately in electronic industries that is fabrication of printed circuit boards and radio engineering.
- This technique is difficult to weld highly reflective surfaces.
Electron Beam Welding:
- This technique is used for joining of high strength, high melting point and high thickness materials, where more precision joint are produced
- By applying a tungsten electrode at high temperatures electrons are emitted
- These electrodes will be directed towards the anode
- Depending on position of the anode electrons are associated and they come out of annular anode
- By creating the magnetic field using the field electrons, they converge as single ray of electron beam which is focusing on the work piece at a given point
- Due to which heat concentration on the work piece will be very high and the depth of penetration is maximum
- Due to small diameter of the electron beam weld bead width is very small and depth of penetration is maximum
- Depending on the thickness of the material and the melting point temperature of the material, the potential difference between cathode and anode, distance between cathode and anode is controlled
- Due to scattering of the electrons with atmospheric gases energy of the electrons will be reduced and they do not focus on the work surface as an electron beam
- To overcome this, the process is carried out under vacuum conditions
- The same setup is used for high strength and high melting point materials cutting as well.
It will be used in welding of titanium barium stainless steel materials in space craft and aerospace industries with more precision joint.
- Initial investment is very high
- Maintenance cost is more because of vacuum environment
- Limitations in size of the compounds etc.
click Here to Know More about: Different Types of Liquid State Welding