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Q. What is coated electrode?
These types of electrodes are prepared by coating of flux on metal wire. Due to arc metal electrode melts and used as filler metal. Flux melts and forms some gas which prevents contact of oxygen and nitrogen with molten metal and also flux covers molten metal pool which is known as slag. When metal cools this slag can be removed by chipping.
CONSTRUCTIO N and WORKING: The boiler barrel is cylindrical shell and consists of large number of flue tubes. The barrel comprise of a rectangular fire box at one end and a
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PRINCIPLE OF SUBMERGED ARC WELDING In submerged arc welding, the arc zone is submerged beneath the molten flux and hence there is no visible signature of the arc. Welding current
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