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

Forecasting, State the need for demand forecasting?

State the need for demand forecasting?

Cylinder head de-carburising and valve lapping, Cylinder Head De-carburisin...

Cylinder Head De-carburising and Valve Lapping: Cylinder head mounts on the top of the engine cylinder, the inner side of the cylinder head is always in direct contact of combusti

Determine the equivalent evaporation, Illustrate how the efficiency of Rank...

Illustrate how the efficiency of Rankine Cycle can be improved by the use of Regenerative and Reheat heating. (b) During a test on boiler trial the following data were obtained

Instantaneous stress and elongation - bar, Instantaneous stress and elongat...

Instantaneous stress and elongation: What shall be the instantaneous stress & elongation of a 25 mm diameter bar, 2.6 m long, suspended vertically, if any mass of 10 kg falls

Determine the excavation of soil, Determine the Excavation of soil Exc...

Determine the Excavation of soil Excavation of soil in open well foundations is done  by dredging with grab buckets or similar equipment. The volume of excavated soil always e

Steps of inspection of electrical equipment, Inspection of Electrical Equip...

Inspection of Electrical Equipment STEPS All electrical equipment are checked for proper functioning. The starting and lighting of the motorcycle should be prope

Camshaft-basic components of engine , Camshaft : The camshaft controls th...

Camshaft : The camshaft controls the opening and closing of the two valves. The associated parts are push rods, rocker arms and valve springs. The camshaft is driven by a camchai

Plate clutch pressure-clutch slipping, Plate clutch pressure:  Check plate...

Plate clutch pressure:  Check plate clutch pressure for any step using a straight edge.

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