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

Show geographic constraints of the plant, Q. Show Geographic constraints of...

Q. Show Geographic constraints of the plant? The layout of process units will be influenced by the geographic constraints of the site. Spacing is required between plant facilit

Cases of equilibrium , Cases of equilibrium: What are cases of equili...

Cases of equilibrium: What are cases of equilibrium? Sol.: As a result of the acting forces, the body may be having one of the following states: (1) The body can mo

Refrigeration, A refrigeration system produces 40 kg/hr of ice at 0oC from ...

A refrigeration system produces 40 kg/hr of ice at 0oC from water at 25oC. Find the refrigeration effect per hour and TR. If it consumes 1 kW of energy to produce the ice,

Cylinder block-basic components of engine , Cylinder Block: This serves a...

Cylinder Block: This serves as an enclosure to the cylinder. The cylinder is an integral part of cylinder block in 100 cc motorcycle. Figure : Cylinder Block

GOVERNOR, APPLICATION OF GOVERNOR

APPLICATION OF GOVERNOR

Ancillary railway structures, Ancillary Railway Structures: Overhe...

Ancillary Railway Structures: Overhead Transmission Lines When the line is electrified, the electric loco has to pick up the electric current from a cable that runs

Derive the equation for the pressure difference, The differential manometer...

The differential manometer (shown below) is used to measure the pressure difference between two vessels. Derive the equation for the pressure difference (pA - pB) in terms of the l

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

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