Electron beam welding(ebw )-effect of process parameters, Mechanical Engineering

Assignment Help:

EFFECT OF PROCESS PARAMETERS

High voltage gives high velocities in the electron beams. The mutual repulsion effects in the constituent electrons will be less marked at high velocities than at low velocities. Therefore, the higher the voltage, the sharper the possible focus. The sharper the possible focus, the deeper the penetration for a given power. The longer the working distance, the greater the depth of field, and greater the focus tolerance. This of course is related to convergence of the beam in respect to the work piece. High voltage beams have a narrower angle of convergence than low voltage beams. As penetration in a material is proportional to the energy density during welding, surface speed will also affect penetration. The slower the speed, the greater the penetration, however, if the speed is too slow the entire work piece will heat up and a massive heat affected zone will result. Therefore the lowest practical speed is limited to around 250 mm per minute. The factors, which influence weld depth, are as follows:

  • Beam current
  • Accelerating voltage
  • Welding speed
  • Joint material
  • Joint design
  • Focal point

 


Related Discussions:- Electron beam welding(ebw )-effect of process parameters

Determine controllability matrix – open loop control system, An open-loop c...

An open-loop control system has the following state-space model: (a)  Determine the characteristic equation for the open-loop control system. (b)  Determine the characte

Evaluate the speed of wheel, In an epicyclic gear train, the internal wheel...

In an epicyclic gear train, the internal wheels B and A and compound wheels C and D rotate independently about axis O. The wheels E and F rotate on pins fixed to the arm G. E gear

Determine the workdone by the fluid on the piston, Explain Zeroth law and 1...

Explain Zeroth law and 1 st law of thermodynamics. Describe Internal energy and Enthalpy. What is a PMMFK. Give the expression for reversible workdone in a thermodynamic system

Expression for the normal and tangential stresses, Expression for the norma...

Expression for the normal and tangential stresses: By sing Mohr's circle, derive expression for the normal and tangential stresses on a diagonal plane of material subjected t

Clearence, what is clearance?what is the need of clearance?differences betw...

what is clearance?what is the need of clearance?differences between with clearance and with out clearance?

Hot service insluation thicknesses, Q. Hot Service Insluation Thicknesses? ...

Q. Hot Service Insluation Thicknesses? Hot Service Insluation Thicknesses are specified based on the following design criteria: • Average Annual Climatic Conditions:

Stress concentrations, Describe the test specimens that were used in the te...

Describe the test specimens that were used in the testing program, and what one hopes to learn by testing them. Show the "test matrix" (i.e. a listing of what specimens made of wh

Equilibrium diagram, what do understand by the term equilibrium diagram

what do understand by the term equilibrium diagram

Final year project, Project is about Heat exchanger kit named TE 93.....Pro...

Project is about Heat exchanger kit named TE 93.....Project guide has told us to do something with it..without modifying the project largely.....i came up with change of material o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd