Flash butt welding, Mechanical Engineering

Assignment Help:

Flash Butt Welding

The two pieces to be welded are pressed against each other by applying a pressure. To whatever finish the faces are machined, there will be some protuberances which cause contacts. Because of the bridges present, when a high welding current is passed, a high current density results at the contact surface. The bridges get heated upto molten conditions since one work piece is slowly advancing towards the other. After the faces attain a plastic stage upsetting pressure is applied. The molten metal and some of the impurities associated with it are expelled. Depending on the material and contact area preheating and post heating may be warranted.

A typical flash butt welding sequence will comprise the following steps. Load machine - clamp work - apply preheating force - preheat - Release preheat force to separate work pieces Contact Contact parts lightly for flashing - apply welding voltage - Flash at high voltage Flash at normal voltage - Cut off welding current - pass up set current - Upset - Cut off upset current - Reclamp and post heat - Pinch off and shear die operation Unclamp work - Return platen and unload.


Related Discussions:- Flash butt welding

Structural steel materials, Q. Structural steel materials? All structur...

Q. Structural steel materials? All structural steel materials to conform to GS-904-0510. All miscellaneous steel materials to conform to GS-904-0515. All welding consumab

What are the objectives of the earth pressure, What are the objectives of t...

What are the objectives of the earth pressure and retaining structures? After knowing all concepts about the same you should be able to learn: a. Know the field situations w

Define a crm and what are its uses, The process of learning more about clie...

The process of learning more about clients needs such as information about customers , sales, marketing effectiveness, responsiveness and market trends is called as Customer Relati

Aeronautical engineering, Aeronautical engineering is a branch of aerospace...

Aeronautical engineering is a branch of aerospace engineering, thus some people use the 2 terms interchangeably. It is also sometimes considered that aeronautical engineering cover

Stress concentration factor, 1. Write a short note (not more than half A4 p...

1. Write a short note (not more than half A4 page) on your understanding on St. Venant's Principal for your engineering design analysis. 2.  Estimate the " Stress Concentration

Find the minimum weight to keep equilibrium, Find the minimum weight to kee...

Find the minimum weight to keep equilibrium: A belt supports the two weights W 1 an d W 2 over a pulley as shown in the figure given below. If W 1 = 1000N, fi

Find the maximum permissible, A wooden cylinder (specific gravity = 0.6) of...

A wooden cylinder (specific gravity = 0.6) of circular cross - section having length L and diameter D floats in water. Find the maximum permissible (L/D) ratio so that the cylinder

Sustained bending moment, Q. Sustained Bending Moment? When sustained b...

Q. Sustained Bending Moment? When sustained bending moments or axial thrust loadings are applied to the flanged joint during operation in sufficient magnitude to warrant consid

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