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Q. Explain Flash Butt welding?
In this process the ends of two rails are kept at fixed distance apart and a mould (designed to suit the rail section ) is fitted on. The rail ends are then heated to yellow red temperature with a blowlamp. A swiveling type crucible containing iron oxide and aluminum powder to match the metallurgical composition of the rails is then ignited and the molten metal is poured into the mould so that the gap between the rail ends is filled up with over flow on all sides. The mould is then removed and excess metal is chipped off from the railhead while still hot. Later it is filed to railhead profile.
Normally it takes 45 minutes to weld a joint but by quick thermit process it can be done in 15 minutes. The joint can be brought into use immediately after welding.
Q. Location of construction joints? Construction joints are generally required in construction works since there is limited supply of fresh concrete in concrete batching plants
hoyers long line method?
Elongation of bar due to self weight
The sketch shows a common consumer product called Water Pik. This device uses a motor to drive a piston pump that produces a jet of water (diameter d = 3 mm, temperature T = 10 °C)
surveying of building sites with chain
Q. Kicker of reinforced concrete cantilever retaining walls located at the position of largest moment and shear force - why? Generally for reinforced concrete cantilever retai
Calculation of deformation For calculation of deformation at some stage before the total creep is reached, it may be assumed that about half the total creep takes place in f
A stationary 40 kN single axle load (applied on a circular contact area of radius = 152 mm = 6") is applied to each of the flexible pavement structures indicated below. Assuming li
THE DESIGN PERIOD AVERAGE DAILY DEMAND CALCULATE. THE DESIGN DEMAND FOR THE WATER RETICULATION OR DISTRIBUTION PERIOD.
NaCl->AgNO3
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