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PRINCIPLE OF SUBMERGED ARC WELDINGIn submerged arc welding, the arc zone is submerged beneath the molten flux and hence there is no visible signature of the arc. Welding current flows through the arc and the heat energy released from the arc melts the electrode, flux & some base material to form a weld puddle that fills the joint. Sufficient depth of flux present in this process completely shields the arc column and protects the weld pool from atmospheric contamination. As a result of this unique protection, the weld beads are exceptionally smooth. The flux around the arc column melts, undergoes thermo - chemical transformations and finally solidifies on the surface of weld metal as slag.
Q. Illustrate Wood and Silica Flour? Wood Flour : It is ground wood particles or other cellulose materials such as grain hulls. They serve the same purpose as cereals except t
The total process of a the refining business begins at the oil field or gas field and runs all the way to the sending of processed hydrocarbon to a final user. Upstream applies
Q. Show the corrosion mechanisms? The following corrosion mechanisms are likely to happen in the Oil Treating Unit: Under Deposit Corrosion and MIC Since cooling e
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Q. Factors in the design of high temperature materials? There is typically little correlation between room temperature strength and high temperature strength of creep-resistant
Clutch spring height: Check clutch spring height with a Vernier caliper. Spring height should be of minimum height of 25.55 mm.
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Site Selection: The following consideration govern the choice of site for an airport : (a) The area served must be able to generate and attract the estimated passen
Cylinder Bore: The nominal inner diameter of the working cylinder is called the cylinder bore and is designated by the letter D and is usually expressed in millimetre (mm).
COMPETENCY STATEMENT: In this programme, every learner shall be assessed on a continuous basis for his/her knowledge and skills during the programme duration. Learners' competenc
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