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Yes, welding fluxes can significantly affect the penetration and contour of the weld bead. Fluxes help stabilize the arc and protect the molten metal from oxidation, which can enhance penetration. Additionally, different types of fluxes can influence the fluidity of the weld pool, affecting the bead's shape and contour. Proper selection and application of flux are crucial for achieving desired weld characteristics.
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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.
Mineral based fluxes welding?
Mineral-based fluxes are commonly used in welding to facilitate the joining of metals by removing oxides and impurities from the surfaces, promoting wetting, and preventing oxidation during the welding process. These fluxes are composed of mineral compounds such as borax, fluoride, and chloride, which lower the melting point of the oxide layers and help to create a clean and strong weld. Different types of mineral-based fluxes are used based on the specific requirements of the welding application, such as soldering, brazing, or welding different metals.
What is acidic fluxes?
Acidic fluxes are materials used in soldering and welding to remove oxides from the surfaces being joined. They work by breaking down the oxide layer on the metal, allowing for better wetting and bonding of the solder or welding filler material. However, acidic fluxes can be corrosive and may require thorough cleaning after use to prevent long-term damage to the joint.
What are the various types and forms of filler metal and fluxes?
Filler metals can be classified as electrodes, rods, wire, or strips depending on the welding process being used. Fluxes can be categorized as active or neutral, and come in various forms like powder, paste, liquid, or coated rods depending on the application. Each type and form of filler metal and flux is designed to meet specific welding requirements and conditions.
Are soldering and brazing fluxes the same?
No, soldering and brazing fluxes are not the same. Soldering fluxes are designed to remove oxides from the metal surfaces being joined during soldering, while brazing fluxes are formulated to clean the joint and promote wetting for the filler metal in brazing processes. Additionally, brazing fluxes can handle higher temperatures compared to soldering fluxes.
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 does heavily oxidized weld deposit mean?
A heavily oxidized weld deposit refers to a weld that has been exposed to oxygen during the welding process, leading to an excessive formation of oxides on the surface. This can weaken the weld's integrity and compromise its mechanical properties. It is important to avoid excessive oxidation during welding by using shielding gases or fluxes to protect the weld from oxygen.
Do all fluxes give off fumes that may be toxic?
No, not all fluxes give off toxic fumes. Some fluxes are specifically formulated to be low fuming or fume-free, making them safer to use. It's important to always check the product safety data sheet and use proper ventilation when working with fluxes to minimize exposure to any potential toxins.
What type of hazard is fluxes?
Fluxes can refer to various types of hazards depending on the context, but in environmental science, they often relate to the flow of energy or materials, such as nutrients or pollutants, within ecosystems. These fluxes can pose hazards when they lead to imbalances or contamination that negatively impact health, biodiversity, or ecosystem stability. For example, nutrient fluxes can cause algal blooms in water bodies, leading to hypoxia and harm to aquatic life. In summary, fluxes can represent environmental hazards when they disrupt natural processes or lead to pollution.
What Fluxes are needed for melting brass?
Lemeltic degassing flux
What is the partly fused sand and fluxes of which glass is made?
Frit
