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

Resistant body-mechanism-curvilinear motion-machine, Resistant Body: A bo...

Resistant Body: A body is called resistant body if this is capable of transmitting the needed forces with negligible deformation. Machine: A machine is a mechanism or a se

Space for coil removal, Q. Space for coil removal? Locations, of all co...

Q. Space for coil removal? Locations, of all coils clearly indicated on the drawings. Provide adequate space for coil removal, and access doors on both sides. Flexible connecti

Beam finite element method, Beam Finite Element Method: Design the fin...

Beam Finite Element Method: Design the finite element model of the beam subjected to combined loading by using the minimum number of Euler-Bernoulli beam elements as shown in

Ratio of applied stress, Ratio of applied stress: What should be the r...

Ratio of applied stress: What should be the ratio of applied stress, s, to yield stress s Y in a large thin plate so that plastic spread along lint of crack is equal to  1 /1

Bevel gear and shaft analysis, I have a bevel gear and shaft and I want to ...

I have a bevel gear and shaft and I want to know the maximum load that can be applied on it. also I have no information about it, what kind of information is needed for this calcul

Statics, what are the applications of statics in engineering

what are the applications of statics in engineering

QFD chart and engineering specifications, Deliverables: A QFD chart, sh...

Deliverables: A QFD chart, showing the relationships between the customer requirements and the engineering specifications. (Refer to the Ullman QFD chart posted on My

Explain the meaning of a raft foundation, Explain the meaning of A raft fou...

Explain the meaning of A raft foundation A raft foundation, as also combined footing, cannot be considered to be the opposite of a slab supported on the columns with a defined

Ceramic tools-alloys for cutting tools, Ceramic Tools Aluminium oxide ...

Ceramic Tools Aluminium oxide or Al 2 O 3 is pressed and sintered in a powder metallurgy method in various shapes of cutting edges that are fastened to mechanical shanks. The

Heat treating equipment, Heat Treating Equipment: The major equipment...

Heat Treating Equipment: The major equipment for heat treatment is furnace. There are two main categories of furnaces - batch and continuous. The furnace selection needs cons

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