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

Machine elements, instant center of direct contact slider

instant center of direct contact slider

How do you repair a hydraulic jack, In general, it seems easy: polishing sc...

In general, it seems easy: polishing scored cylinders and pistons, replacing worn seals, existing excessively worn or damaged parts, etc. Though, for an ordinary person, the proble

Queuing model, ppt of applying queuing model in railway reservasion

ppt of applying queuing model in railway reservasion

Describe the insulation thickness, Q. Describe the Insulation thickness? ...

Q. Describe the Insulation thickness? Insulation thickness shall be selected in accordance with the following tables forming part of this specification: Table I Outdoor Hot

Define inversion of a mechanism, Define Inversion of a mechanism ? Illustra...

Define Inversion of a mechanism ? Illustrate in detail about any three of the Inversions of the single slider crank chain Mechanism. (a) What do you understand by Degree of Free

Critical euler axial compression stress, Determine the minimum critical Eul...

Determine the minimum critical Euler axial compression force,  Pcr and the minimum critical Euler axial compression stress, cru, for the column below which is pinned at the top and

Dynamic analysis., dynamic analysis of four bar linkage by kelin''s constru...

dynamic analysis of four bar linkage by kelin''s construction.

Horizontal curves - railways, Horizontal Curves - Railways In railwa...

Horizontal Curves - Railways In railway engineering, the horizontal curve is defined by its degree as well as by its radius. The degree is the angle subtended at the centre

Composite aspect ratio, Composite Aspect Ratio The length ratio of a r...

Composite Aspect Ratio The length ratio of a reinforcing fibre to its diameter is termed as aspect ratio. In the so-termed as fibre reinforced plastics or composites the aspec

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