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Thermit Welding
This process utilises the intense heat developed during the reaction between iron oxide and aluminium. When a mixture of three parts of iron oxide and one part of aluminium by weight is locally burnt with a special ignition powder a vigorous reaction takes place which proceeds rapidly through the mass, resulting in the formation of aluminium oxide and iron and a considerable amount of heat. The heat is sufficient to melt iron and oxide slag. In carrying out thermit welding the thermit mixture is placed in a refractory crucible above the pieces to be welded. The molten metal from reaction is guided to the joint to be welded by a sand mould, which is fastened around the work. By virtue of its superheat, the thermit metal melts a portion of base metal with which it comes in contact. This process is ideal for welding rails of railway tracks.
Applications with Medium Laser Power Several laser welding applications have recently evolved in this power range of 1 to 10 kW. Because, the laser provides a basis for co
a) The total estimated time for an operation ie assembly of a pin is 2 minutes. If the rating is 120% determine normal time. If total allowances allowed are 10% for that job, calcu
After trial if oil seal found still leaking: Dismantle engine and check crank shaft for run out which should not be more than 0.10 mm.
what is non sercular torsion
GENERAL REASONS FOR DEFECTS The importance of weld quality is increasingly felt as we go ahead with the fabrication of sophisticated products using higher strength mater
no passing rule definition
Define Supports Pins and Jack Pins When the work is clamped directly in the body of the jig or fixtures, there is always a chance of error due to improper supports on accounts
Write down short notes on : (i) Dynamometer and Brakes. (ii) Transmission Dynamometer and Absorption Dynamometer. (iii) Epicyclic Gear Train Dynamometers.
which type of guideways are used in centerless grinding machine? which are the errors find in different guideways?
1. Write a short note (not more than half A4 page) on your understanding on St. Venant's Principal for your engineering design analysis. 2. Estimate the " Stress Concentration
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