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

Wire-frame entities-representing ellipse and parabolas, wire-frame entities...

wire-frame entities-representing ellipse and parabolas

Measurement of brake power by prony brake dynamiter, a) Illustrate with nea...

a) Illustrate with neat and clean diagram the measurement of brake power by prony brake Dynamiter OR Belt transmission type Dynamiter. b) A torsion dynamometer is fixed to a pro

Abrasive machining processes, Abrasive Machining Processes Such machin...

Abrasive Machining Processes Such machining processes are precision machining processes. They generate work-piece surfaces along with a high degree of surface smoothness and d

Objectives service and maintenance procedures , Objectives After study...

Objectives After studying this unit, you should be able to explain various procedures in service and maintenance, and appreciate the importance of the inspections

Mechanicalthermodynamics, Does this college offer courses in the field of m...

Does this college offer courses in the field of mechanicalthermodynamics?

Newton law of cooling, Ask question Briefly explain how, using Newton’s L...

Ask question Briefly explain how, using Newton’s Law of cooling, you may write the temperature of a cooling body as an exponential function of time#Minimum 100 words accepted#

Pure torsion, Pure Torsion: What do you mean by pure Torsion?       ...

Pure Torsion: What do you mean by pure Torsion?                                                                                                       In general two typ

Determine period of motion and frequency, (a) Illustrate Fourier Series and...

(a) Illustrate Fourier Series and calculate the constant coefficients. (b) A Harmonic motion is provided by x(t) = 10sin(30t -π/3) where t in seconds and phase angle in radians.

Stud welding, Stud Welding This is an arc welding process in which the...

Stud Welding This is an arc welding process in which the arc is struck between a metal stud or similar part and the base metal. The arc heats the mating ends to a proper tempe

Fracture toughness of material of plate, Fracture toughness of material of ...

Fracture toughness of material of plate: A large thin plate carrying a crack of 70 mm at its centre is subjected to fluctuating stress cycle perpendicular to crack. s max = 7

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