Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
FUNCTIONS OF FLUX COATINGThe coating of the electrode performs very important functions which are essential for obtaining a weld of required quality; in terms of chemical composition, mechanical properties and weld metal cleanliness.a) The primary function of the coating is to initiate and maintain the arc column between the electrode and the work. This requires a continuous supply of ionized gas or continuous ionisation of the medium between the two terminals. Arc initiation requires a higher voltage than that to sustain it. The ionizing elements help the easy initiation and further maintenance of a column of ionized gas.b) Having established a stabilized arc, the coating carries out its second function of protecting the molten metal that is transferred from the electrode to the weld below. The gas forming materials in the coating produces a gas shield by burning in the arc heat. The shielding mostly comprises active gases like carbon dioxide, hydrogen and oxygen. These isolate the weld area from the surrounding atmosphere.c) The slags that forms a result of the reaction between the flux and the oxides, further protects the weld pool by covering it complete. This prevents any possible absorption of gas by the molten weld metal. In addition, the slag slows down the freezing rate of molten metal. Also it slows down the cooling rate of solidified weld metal.d) To compensate the loss of alloying elements additional quantity of these elements are introduced into the weld metal through the electrode coating.e) Deoxidisers which reduce the oxidation of the base metal are brought to the reaction zone through the medium of coating. f) Because of the cup that is formed at the tip of the electrode during welding, the arc stream is concentrated and is directed towards the weld pool. The concentrated arc agitates the weld pool. This allows the dissolved gases to be released and also helps to achieve an uniform weld structure.g) Flux acts as scavenger.h) Finally the electrode coating, except in the case of iron powder electrodes, is a poor conductor of electricity. This property is very much useful when welding has to be carried out in a deep narrow groove.
Q. An I section has dimensions Top flange = 8 cm × 2 cm; Bottom flange = 12 cm × 2 cm; Web = 12 cm × 2 cm; Over all the depth of section = 16 cm. Determine M.I. of I s
WIRE FEEDING UNIT The wire electrodes are supplied as continues coils in wire spools. The solid wires are available in the following sizes 0.8, 1.0, 1.2, 1.6, 2.0 and 2.4 mm di
How we could build the working model of hartnell governor?
Explain the Open system - Thermodynamic The system that can exchange both of the mass and energy that is Heat and work with its surrounding, the mass in the system may not be c
what is the working princile of high preesure die casting process
Reduce system to a single force: Q: A system of parallel forces is acting on rigid bar as shown in the figure given below. Reduce this system to a single force
General Phase of Radial Drilling Machine Steps- 1. Prepare a strong foundation for the value study. In radial drilling machine hole can not be produce in any angle.
Constructive Solid-Geometry Methods (CSG) Constructive models represent a solid as a combination of primitive solids. This modeling technique combine the volumes occupied by ov
A manufacturing facility consists of five departments, 1, 2, 3, 4 and 5. It produces four components having the manufacturing product routings and production volumes indicated in t
Sand blasting handling method: On last experiment we had decided to use 3.0 bars as it shown better result. Now we had to investigate the sand blasting handling
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd