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Why is a small diameter gas tungsten arc welding nozzle often used?
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What are the ten difference between TIG and MIG welding processes?
ElectrodeTIG welding uses a tungsten electrode that is not consumed during the welding process. MIG welding uses a metal electrode that doubles as filler material for the weld and is consumed during welding.Shielding GasTIG welding primarily uses argon as a shielding gas, with helium occasionally used. Argon is also the primary shielding gas used in MIG welding, but argon mixtures and carbon dioxide are often used for different applications.Filler MaterialTIG welding requires a separate filler material in rod or wire format because the electrode is not consumed. MIG welding delivers the filler material via the electrode.Work Piece MaterialsTIG welding can be applied to just about any metal, from steel to aluminum and exotic alloys. MIG welding was developed for nonferrous metals, but can be applied to steel.DifficultyTIG welding is considered to be more difficult than MIG welding because tighter tolerances have to be maintained between the electrode, the filler rod and the work piece.
Which element is used in light bulbs as filment?
Most often it is tungsten.
Why is a transformer rectifier often prefferred for smaw?
SMAW stands for shielded metal arc welding. The rectifier used in the welding machines must be referring to this type welding.
Is tungsten a pure substance or mixture?
Tungsten, like many other metals is found in ore. Often time in both an oxidized and in elemental form
What is intermittent welding?
intermittent welding (also known as skip welding) is a pattern of welding that allows the weld joint to cool by welding in a series of "skips" on opposite or far sides from the last bead. This pattern is often used for thin material as it is likely to warp if overheated.
How strong Tungsten is?
It is a extremely durable metal but often mistaken as Tungsten Carbide. Tungsten Carbide is Tungsten ground to a powder with Carbon and compressed then nickel is heated and added as the binding agent or glue. The result is a very hard composition, but it is not a metal and it is not a solid. It is, however brittle. This means it is prone to chipping or cracking when Tungsten Carbide hits a hard surface.
Why it is difficult for a firefighter to hold a hose which ejects a large amount of water at a high velocity?
The answer is very simple and it goes back to a basic law of physics.We all know that for every action, there is an equal and opposite reaction, right? So with regards to a fire hose, as the water discharges from the nozzle, there is force pushing back called nozzle reaction. The narrowed nozzle is forcing the speed of the water to accelerate.The higher the pressure, the higher the nozzle reaction, for a given nozzle diameter. Some of the reaction is dissipated in the friction of the hose on the ground, but a lot of it results in a force pushing the nozzle back toward the firefighters.In short, the amount of force necessary to accelerate that water through the nozzle is about the same as the force pushing the nozzle in the opposite direction from the discharge.For example, if you were to pump 357 gallons per minute at 60 pounds per square inch, through a nozzle orifice of 1 1/2 inches, you would have nozzle reaction of approximately 205 pounds. That means the firefighters would have to push BACK with that amount of force to hold the nozzle in position. If the same amount of water were pumped at the same pressure through a tip with 1 3/4-inch diameter, the force would be closer to 270 pounds. This is a critical consideration when operating a nozzle from the top of a ladder!Sudden Nozzle ReactionsThe nozzle must also be opened and closed slowly to avoid a much higher nozzle reaction due to the static pressure generated at the pump (there is no friction loss when the water is stopped).Ref NFPA Report: Test of Heavy Stream Appliances, 1957.
How much training is necessary for most welding jobs?
The amount of training necessary for welding jobs can vary depending on the specific job requirements, industry, and level of expertise desired. Some factors to consider are: Basic Welding Skills: For entry-level welding positions, basic training is typically required. This training may be obtained through vocational schools, technical institutes, community colleges, or apprenticeship programs. Certification and Specialized Training: Many welding jobs require specific certifications to demonstrate proficiency in certain welding processes or to meet industry standards. Advanced Techniques and Specializations: Some welding jobs may require additional training for advanced techniques and specialized applications. This can include training in specific welding processes like TIG (tungsten inert gas) welding or MIG (metal inert gas) welding, as well as specialized skills such as pipe welding or underwater welding. Continuing Education and Professional Development: The field of welding is constantly evolving, with new techniques, equipment, and safety practices emerging. To stay updated and maintain their skills, welders often engage in continuing education and professional development activities.
The metal with the highest melting point for this reason it is often used as the filament in light bulbs?
tungsten
Are there any welding jobs in the community?
Check first with your community college as they very often have contact with companies that are looking for graduates of a welding class. Check local phones books of companies that do welding and stop in and ask if they are hiring
Why Dc welding sets are prefered over AC welding sets?
Often because with DC, it is possible to change the direction of the weld current for the task at hand.
Are there killed carbon steel pipe-fittings?
Yes. Argon gas welding is often used for killed steel welding to inhibit the oxidation of the steel.
