Transformer for flash butt welding, Mechanical Engineering

Transformer for flash butt welding

The transformer required for flash butt welding is similar to that needed for other resistance welding processes. Here, the transformer is to be of totally enclosed type to prevent flash or dirt. Usually flash butt welding machines have very sophisticated control making the equipment automatic. All the steps are to be precisely synchronised and therefore,
an automatic sequential controller will be provided.

Usually a motor driven variable speed flashing can with pneumatic or hydraulic upsetting mechanism is adopted. Heat control is accomplished using ignitrons or magnetic contactors. The electronic contacts have the following advantages over their magnetic counter parts:

  1. Elimination of periodic maintenance such as contact dressing.
  2. Control of upset current independent of flashing current.
  3. Application of post heat current at a value different from that of either flash or upset current.
  4. Use of dual flashing voltage in which flashing action can be started at one voltage and switched to another without interruption of the flash.

 

Flash butt welding machines capable of welding an area of 20,000 sq. mm. are available (10000 kVA).

Posted Date: 9/17/2012 6:16:38 AM | Location : United States







Related Discussions:- Transformer for flash butt welding, Assignment Help, Ask Question on Transformer for flash butt welding, Get Answer, Expert's Help, Transformer for flash butt welding Discussions

Write discussion on Transformer for flash butt welding
Your posts are moderated
Related Questions
Chassis Lubrication System : This lubrication system consists of outer body parts, which are lubricated from outside of the body. Table of Lubrication Points Sl.

Geometric Defects   Undercut Undercut represents a depression into the base metal adjacent to the toe of the weld and if it forms a notch, it is a potential danger for th

Briefly Explain transient response for various input signals - unit step input - unit parabolic function - unit ramp function - impulse function


Determine reactions of the overhanging beam: Determine r eactions at points A and B of the overhanging beam as shown in the figure given below.

Compute the magnitude and direction of the force: Problem: Compute the magnitude and direction of the force F¯ = (320 N) i¯ + (450 N) j¯ - (600 N) k¯ Solution

State the types of foundations We saw the different types of foundations commonly adopted for specific situation. In actual practice the situations are not very simple both in

Q.Explain working of Steam Drum? Total solids concentration in the steam at steam manifold outlet shall not exceed 0.5 ppm during steady operation at MCR.  Fabricator must indic

A machine machines parts in exactly 1.5 minutes. The machine requires tool change according to an exponential distribution with a mean of 12 minutes between occurrences. The tool c