Radiant Welding Types

Laser beam welding:

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  • 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.

Limitations:figure2

  • This technique is difficult to weld highly reflective surfaces.
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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.

Electron_beam_welder

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Applications:
It will be used in welding of titanium barium stainless steel materials in space craft and aerospace industries with more precision joint.

Limitations:

  • 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

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