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

Explain about horizontal vessels, Q. Explain about Horizontal Vessels? ...

Q. Explain about Horizontal Vessels? Horizontal vessels shall preferably be designed for two saddle supports attached by welding. Design of saddle supports and calculation of

Working of reaction turbine, Working of Reaction turbine: In the impul...

Working of Reaction turbine: In the impulse turbine the steam is expanded, causing pressure and heat drop in nozzle only and the moving blades only direct the steam through an

Interference, construction and working of michelsons interferometer

construction and working of michelsons interferometer

Wilson-Hartnell Governor:, A Wilson-Hartnell governor is illustrated in giv...

A Wilson-Hartnell governor is illustrated in given Figure. In this, the balls are associated by two springs that are known as main springs. The main springs are symmetrically arran

Mechatronics, what is plc and how does it works

what is plc and how does it works

Define trunnion jig, Define Trunnion Jig These jigs are used for drilli...

Define Trunnion Jig These jigs are used for drilling holes on very large or odd. 1. Figure shows the shaped parts from different sides. Figure: Trunnion

National supply and national demand curves, National supply and national de...

National supply and national demand curves: 1. Explain why neighboring countries tend to trade extensively with each other. 2. Use Table 1.1 to find the five most open econ

Calculate the magnitude of maximum bending moment, Calculate the magnitude ...

Calculate the magnitude of maximum bending moment: The shear force diagram for the overhanging beam is illustrated in Figure. Draw the loading diagram & bending moment diagram

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