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

#totto cycleitle.., for an otto cycle, compression ratio=8.5:1,air inlet=15...

for an otto cycle, compression ratio=8.5:1,air inlet=15degree celsius and pressure=101.3kpa, maximum cycle temperature= 1800degree celsius, what is temperature after compression,te

Couple, What are properties of couple

What are properties of couple

Plate clutch warpage-clutch slipping, Plate clutch warpage: Place plate cl...

Plate clutch warpage: Place plate clutch on surface plate and check for warpage. Ensure that0.20 mm feeler gauge does not slide freely.

Example of change of enthalpy, Example of change of enthalpy: Q 0.5...

Example of change of enthalpy: Q 0.5kg/s of a fluid flows in steady state process. The properties of fluid at the entrance are measured as p 1 = 1.4bar, density = 2.5k

Equation of motion of lift, Equation of motion of lift: Write equatio...

Equation of motion of lift: Write equation of motion of lift when move up and when move down   Assume,   W = Weight carried by lift m = Mass carried by lift = W

Calculate the cutting speed, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Construction of boiler, CONSTRUCTIO N FEATURES : Comprises of a water ...

CONSTRUCTIO N FEATURES : Comprises of a water drum which is connected to two headers at the front and back ends. The headers are connected by large number of water tubes which

What is plain concrete footing, What is Plain Concrete Footing? Plain C...

What is Plain Concrete Footing? Plain Concrete Footing: Footings carrying relatively light loads are constructed with plain concrete. You have already seen a plain concrete

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

Gears interchange between y2k and non y2k model, Gears interchange between ...

Gears interchange between Y2K and non Y2K model: Check for mixing of Y2K and non Y2K gears by seeing the identification marks provided on the gears.

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