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

Determine in detail about the depth of foundation, Location with Respect to...

Location with Respect to Depth The depth below ground level at which the bottom of a foundation structure is located depends on number of factors, the most important of which

Determine the concurrent forces, Determine the concurrent forces: Four...

Determine the concurrent forces: Four coplanar concurrent forces act at point and keep it at rest. These are mention in Figure. Determine the forces P and Q. Solution

Shells, SHELLS: In the topic (SHELLS) , we have seen the assumptions ...

SHELLS: In the topic (SHELLS) , we have seen the assumptions made in the analysis of thin shells. For a spherical shell, which is symmetrical in all of the directions, the ho

Torsion equation for solid circular shaft, Prove the torsion equation T/J=τ...

Prove the torsion equation T/J=τ/R=C. θ/L for the solid circular shaft. State the various assumptions used on above said equation.

Velocity ratio for open belt drive, V elocit y Ratio for Open Belt Drive:...

V elocit y Ratio for Open Belt Drive: Figure Consider a simple belt drive (that is one driver and one follower) as shown in the figure given below Let D 1

What is a steam turbine diaphragm, Steam turbine comprises of stages, numbe...

Steam turbine comprises of stages, number and size of the stages depends upon the break horsepower of the turbine. The stage has set of moving and fixed blades. The moving blade

Hydrostatic pressure, can a swimming pool that is full be cracked or lifted...

can a swimming pool that is full be cracked or lifted by hydrostatic pressure?

Describe the break-even-analysis, What is Time-Study ? How the standard tim...

What is Time-Study ? How the standard time is determined in Time-Study ? What are the Merit-Rating ? Illustrate various methods of Merit-Rating. Describe the Break-Even-Analy

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