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

Chemistry, Ask question #Minimum 100 whow to detect the presence of 2nd gro...

Ask question #Minimum 100 whow to detect the presence of 2nd group basic radicals ?ords accepted#

Determination of reaction at the support beam, Determination of Reaction at...

Determination of Reaction at the Support beam: Draw a SFD & BMD for the beam illustrated in Figure Figure Solution Determination of Reaction at the Support

Array, sorting order of arra

sorting order of arra

Steam turbine power output at each stage, for a 210 MW unit how we calculat...

for a 210 MW unit how we calculate power output at each stage if the turbine has 25 reaction stages

What is the role of mis in decision making, Can you explain about MIS ? Wha...

Can you explain about MIS ? What is the role of MIS in decision making ? Illustrate standardization, specialization and simplification in product design and development.

Sum of horizontal and vertical components, Sum of horizontal and vertical c...

Sum of horizontal and vertical components: The two forces shown in the figure, are to be replaced by an equivalent force R applied at P . Locate point P by finding its d

Distribution of shear force, Determine distribution of shear force, bending...

Determine distribution of shear force, bending moment and stress due to bending in the simply supported beam shown in the figure below, the beam self-weight is included in the unif

Estimate temperature of air at exit from compressor , Estimate temperature ...

Estimate temperature of air at exit from compressor: The air compressor compresses atmospheric air at 0.1MPa and 27 0 C 10 times the inlet pressure. During compression heat

Bolting procedures for equipment, Before installing a bolt, stud or nut, th...

Before installing a bolt, stud or nut, threads shall be examined to ensure that there are no incompletely cut threads in the engagement zone (both internal and external) or burns,

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