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Can welding fluxes affect the penetration and contour of the weld bead?
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Working principle of induction type instrument?
it works on the principle of induction i.e. on the production of eddy currents in the moving system by the alternating fluxes
Advantage and disadvantage of arc welding?
Arc welding has many preferable qualities in welding such as: Faster weld speeds (obvious economics). Less distortion from thermal expansion/contraction. Addition of alloying elements in the electrode flux or coating. Higher weld qualities since scavenging agents can be added that will combine a "float out" impurities. The gas shield from the flux or additional externally added inert gas shields the molten weld pool from harmful atmospheric gases such as oxygen (oxidising) and hydrogen (embrittlement). A better selection of weldable materials (extremely difficult to "torch" weld aluminum due to oxide formation and high thermal conductivity is one example magnesium will start to burn and is hard to put out would be another example).
What is the use of acid in soldering and brazing?
It is used to clean impurities away from the surface to be soldered or brazed. Many times it is included in the flux. The use of acid type of fluxes is actually detrimental to good plumbing , soldering practices because if the flux is not properly cleaned the joint will eat away from the corrosive action of the acid
What is cogging and crawling in case of 3 phase induction machines?
CoggingInduction motors have a series of slots in the stator and in the rotor. These slots should not be equal in number because if they are, there is a good chance that the motor will not start at all due to a characteristic known as cogging. The slots will align like a stepper motor. For this reason, there are an unequal number of slots in the rotor and in the stator, but there can still be situations where the slot frequencies coincide with harmonic frequencies and this can cause torque modulations. The slots are skewed to keep an overlap on all slots to reduce this problem.CrawlingAnother characteristic of induction motors, is crawling. There are harmonic fluxes developed in the gap due to the magnetics of the motor. These harmonics create additional torque fields. A common problem is with the seventh harmonic where the seventh harmonic creates a forward rotating torque field at one seventh of the synchronous speed. There will be a maximum torque just below 1/7 Ns and if this is high enough, the net torque can be higher than the torque due to the line frequency where at 1/7 Ns, the slip is high. This can cause the motor to crawl at just below 1/7 synchronous speed. There is another crawl speed at 1/13 Ns.
Why not rotating magnetic field produced in three phase transformer?
When the three phase stator windings are fed by a three phase supply, a magnetic flux of constant magnitude, but rotating at synchronous speed is produced. The flux passes through the air-gap, and cuts the rotor conductors which yet are stationary. Due to the relative speed between the rotating flux and the stationary conductors, an emf is induced. ( Faraday's laws of electromagnetic induction ). Since the rotor bars or conductors form a closed circuit, rotor current is produced whose direction as by the Lenz's law, is such as to oppose the very cause producing it. In this case, the cause which produces the rotor current is the relative velocity between the rotating flux of the stator and the stationary rotor conductors. Hence, to reduce the relative speed, the rotor starts running in the same direction as that of the flux and tries to catch up with the rotating flux.
What are the ratings and certificates for Fluxes - 1969?
Fluxes - 1969 is rated/received certificates of: Singapore:PG
What is the plural of flux?
Fluxes
What are the release dates for Fluxes - 1969?
Fluxes - 1969 was released on: USA: October 1969 (Chicago International Film Festival)
What Fluxes are needed for melting brass?
Lemeltic degassing flux
What are the various types and forms of filler metal and fluxes?
silver
What is a composition of fluxes and silica fused to make glass?
Frit
What is the partly fused sand and fluxes of which glass is made?
Frit
What is induction type relay?
An induction relay works only with alternating current. It consists of an electromagnetic system which operates on a moving conductor, generally in the form of a disc or cup, and functions through the interaction of electromagnetic fluxes with the parasitic Fault currents which are induced in the rotor by these fluxes. These two fluxes, which are mutually displaced both in angle and in position, produce a torque that can be expressed by T= Κ1.Φ1.Φ2 .sin θ, Where Φ1 and Φ2 are the interacting fluxes and θ is the phase angle between Φ1 and Φ2. It should be noted that the torque is a maximum when the fluxes are out of phase by 90º, and zero when they are in phase.
What is the partly fused mixture of sand and fluxes to make glass?
frit
What does a Mega Flux do in AQW?
A Mega Flux is equal to 5 normal fluxes.
What has the author Louis F Martin written?
Louis F. Martin has written: 'New fire extinguishing compounds, 1972' -- subject(s): Fire extinguishing agents, Patents 'Organic peroxide technology' -- subject(s): Patents, Peroxides 'Fluxes, solders, and welding alloys' -- subject(s): Alloys, Brazing, Flux (Metallurgy), Patents, Solder and soldering, Welding 'Industrial water purification' -- subject(s): Factory and trade waste, Patents, Purification, Sewage
What is a composition of fluxes and silica fused at high temperatures to make glass called?
frit
