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

Instantaneous-absolute-relativec centre-coriolis component, Instantaneous C...

Instantaneous Centre: this is a point around which link rotates at a particular instant. Absolute Instantaneous Centre: this is a fixed centre around which link rotates.

Varignon, how should we consider positive or negative when summation of for...

how should we consider positive or negative when summation of forces

Light, what are the anti refection coating.expretion for thicknessrefractiv...

what are the anti refection coating.expretion for thicknessrefractive index of coating material to act as anti reflacting coating

Advantages of using cam, 1. Greater Design Freedom : Any changes that are ...

1. Greater Design Freedom : Any changes that are required in design can be incorporated at any design stage without worrying about any delays since there would hardly be any i

Classification of steam engine , CLASSIFIC A TIO N: (1 )  In acco...

CLASSIFIC A TIO N: (1 )  In accordance to Cylinder Axis: Engine can be vertical or horizontal. (2 )  In accordance to action of steam: Can be single acting or doub

Process of alloy materials sampling, Q. Process of Alloy Materials Sampling...

Q. Process of Alloy Materials Sampling? The following alloy-materials require a minimum of 10% per lot representative PMI sampling. If any incorrect material is found in repres

Steps for solving problem for finding power, STEP S FOR SOLVING PROBLEM FO...

STEP S FOR SOLVING PROBLEM FOR FINDING POWER: 1. Use formula stress (s) = force (Maximum Tension)/Area Where; Area = b.t that is, Tmax = σ.b.t 2. Unit mass (m) = r.b.t.

Limitations of resistance welding, Limitations of resistance welding ...

Limitations of resistance welding 1). Pressure - tight joints are achieved only with flash butt welding. Resistance welding is not recommended for high pressure joints a

Governor, Use of hartung governor

Use of hartung governor

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