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

Calculate the pressure using density , An open test tube at 293 K is filled...

An open test tube at 293 K is filled at the bottom with 24.2 cm of Hg, and 11.2 cm of water is placed above the Hg. Calculate the pressure at the bottom of the test tube if the atm

Scissor Lift Table, For my senoir design project, I chose a scissor lift ta...

For my senoir design project, I chose a scissor lift table. My issue is finding a a roller to fit my design with .1 in od, press fit on >5 in shaft that can support 125-150 lb/sh

Project, project on solid work 2012 The Final Project is to design a mechan...

project on solid work 2012 The Final Project is to design a mechanical assembly in Solidworks. The design must consist of a minimum of 60 parts, 30 of which must be unique. A uniqu

Forecasting, State the need for demand forecasting?

State the need for demand forecasting?

Necessity of brakes , Necessity of Brakes To stop a vehicle in nor...

Necessity of Brakes To stop a vehicle in normal as well as emergency conditions. To slow down the speed to turn, pass hurdles etc.

Spot welding of different metals-nickel and monel metal, Spot welding of di...

Spot welding of different metals-Nickel and monel metal While spot welding these materials, the settings are to be properly maintained. Welding time, in this case, is only 50 %

Dry saturated steam - thermodynamics, Dry Saturated Steam - thermodynamics:...

Dry Saturated Steam - thermodynamics: A dry saturated steam is single phase medium. It does not have any water particle. It can be obtained on complete evaporation of water at

Define CAD and its applications, Computer-Aided Design (CAD) CAD is use...

Computer-Aided Design (CAD) CAD is used in design and development of new products in a diversity of applications both at commercial/industrial and on a home basis. Illustration

Probability, Airlines like to overbook their flights (this is a vibrant are...

Airlines like to overbook their flights (this is a vibrant area of research called yield management). It is estimated that 10% of the people who book their flight do not show up. H

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