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

Fluid mechanics.., write the conservation of mass for steady flow throught ...

write the conservation of mass for steady flow throught a streamtube with asingal one dimensional inlet 1and exit 2

Explain pole core and pole shoe - dc generator, Pole core and pole shoe ...

Pole core and pole shoe The pole cores are made of steel laminations that are insulated from each other and riveted together. Every pole core has a pole shoe having a curved su

Understanding the role of ownership, Understanding the Role of Ownership : ...

Understanding the Role of Ownership : Before starting a business, entrepreneur should know what is involved in owning a business and what are the roles one will have to play to st

Plastic material and rigid plastic material, Plastic material and rigid pla...

Plastic material and rigid plastic material: For the plastic material, there is stress at which plastic deformation begins. A rigid plastic material is one in which the ela

Design requirements for aircraft access, Q. Design requirements for Aircraf...

Q. Design requirements for Aircraft Access? For some remote locations, provision may be required for occasional landing of aircraft during emergencies or executive visits. Thes

Determine the two roots of equation , (i) Use the GOAL SEEK tool in MS EXCE...

(i) Use the GOAL SEEK tool in MS EXCEL to solve the following equation and determine the TWO roots of this equation between 0 X 4 -8x 3 -x 2 -14x+21=0 (ii). Use the SOLVER t

Determine net force acting on the piston, A Single Cylinder Vertical Engine...

A Single Cylinder Vertical Engine has a stroke of 40cm and a bore of 30cm. The connecting rod is 100cm long. The mass of the reciprocating parts is 140Kg on the expansion stroke wi

Magnitude of the load - hollow cast iron cylinder, Magnitude of the load - ...

Magnitude of the load - hollow cast iron cylinder: Q: A hollow cast iron cylinder 4 m long, 300 mm is the outer diameter, and thickness of metal 50 mm is subjected to central

Working of engine lubrication system , Working of Engine Lubrication System...

Working of Engine Lubrication System: The oil flows from oil pump into the distribution chamber, where it is divided into two parts. One part enters into the right crankcase cove

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