 |
|
|
inert gas | A Wisdom Archive on inert gas | | inert gas A selection of articles related to inert gas | |
| | inert gas | | | Page 1 » Page 2 « | |
| |
| ARTICLES RELATED TO inert gas | | | |  inert gas: Encyclopedia II - Wave soldering - SolderingThe tank of molten solder has a pattern of standing waves (or, in some cases, intermittent waves) on its surface. When the PCB is moved over this tank, the solder waves contact the bottom of the board, and stick to the solder pads and component leads via surface tension. Precise control of wave height is required to make sure solder is applied to all areas but does not splash to the top of the board or other undesired areas. This process is sometimes performed in an inert gas atmosphere to incre ...
See also:Wave soldering, Wave soldering - Wave Solder Process, Wave soldering - Fixtures, Wave soldering - Fluxing, Wave soldering - Spray fluxer, Wave soldering - Foam fluxer, Wave soldering - Preheating, Wave soldering - Soldering, Wave soldering - Cleaning, Wave soldering - Process monitoring Read more here: » Wave soldering: Encyclopedia II - Wave soldering - Soldering |
| |
| | | | | | inert gas: Encyclopedia II - Pebble bed reactor - Safety Features When a pebble-bed reactor gets hotter, the more rapid motion of the atoms in the fuel decreases the probability of neutron capture by 235U atoms by an effect known as Doppler broadening. When the uranium is heated, its nuclei move more rapidly in random directions, and therefore see and generate a wider range of relative neutron speeds. 238U, which forms the bulk of the uranium in the reactor, is much more likely to absorb fast-moving neutrons.[3] This reduces the number of neutrons available to cause 235U fi ...
See also:Pebble bed reactor, Pebble bed reactor - Basic design, Pebble bed reactor - Stationary designs and history, Pebble bed reactor - Mobile power systems, Pebble bed reactor - Safety Features, Pebble bed reactor - Containment, Pebble bed reactor - Production of Fuel, Pebble bed reactor - Criticism Read more here: » Pebble bed reactor: Encyclopedia II - Pebble bed reactor - Safety Features |
| |
| | | | | inert gas: Encyclopedia II - Wave soldering - Preheating The PCB will then enter the preheating zone. The preheating zone consists of convection heaters which blow hot air onto the PCB to increase its temperature. For thicker or densely populated PCBs, an upper preheater might be used. The upper preheater is usually an infrared heater.
Preheating is necessary to activate the flux, and to remove any flux carrier solvents. Preheating is also necessary to prevent thermal shock. Thermal shock occurs when a PCB is suddenly exposed to the high temperature of the molten solder wave fro ...
See also:Wave soldering, Wave soldering - Wave Solder Process, Wave soldering - Fixtures, Wave soldering - Fluxing, Wave soldering - Spray fluxer, Wave soldering - Foam fluxer, Wave soldering - Preheating, Wave soldering - Soldering, Wave soldering - Cleaning, Wave soldering - Process monitoring Read more here: » Wave soldering: Encyclopedia II - Wave soldering - Preheating |
| |
| | | | | inert gas: Encyclopedia II - Wave soldering - Wave Solder Process There are many types of wave solder machines, however the basic components and principles of these machines are the same. A standard wave solder machine consists of three zones: the fluxing zone, the preheating zone and the soldering zone. An additional fourth zone, cleaning, is used depending on the type of flux applied.
...
See also:Wave soldering, Wave soldering - Wave Solder Process, Wave soldering - Fixtures, Wave soldering - Fluxing, Wave soldering - Spray fluxer, Wave soldering - Foam fluxer, Wave soldering - Preheating, Wave soldering - Soldering, Wave soldering - Cleaning, Wave soldering - Process monitoring Read more here: » Wave soldering: Encyclopedia II - Wave soldering - Wave Solder Process |
| |
| | | | | inert gas: Encyclopedia II - Welding - Geometry Welds can be geometrically prepared in many different ways. The five basic types of weld joints are the butt joint, lap joint, corner joint, edge joint, and T-joint. Other variations exist as well—for example, double-V preparation joints are characterized by the two pieces of material each tapering to a single center point at one-half their height. Single-U and double-U preparation joints are also fairly common—instead of having straight edges like the single-V and double-V preparation joints, they are curved, forming the shape of a U. L ...
See also:Welding, Welding - History, Welding - Welding processes, Welding - Arc welding, Welding - Gas welding, Welding - Resistance welding, Welding - Energy beam welding, Welding - Solid-state welding, Welding - Geometry, Welding - Quality, Welding - Heat-affected zone, Welding - Distortion and cracking, Welding - Weldability, Welding - Unusual conditions, Welding - Safety issues, Welding - Costs and trends, Welding - Notes Read more here: » Welding: Encyclopedia II - Welding - Geometry |
| |
| | | | | inert gas: Encyclopedia II - Arc welding - Consumable electrode methods One of the most common types of arc welding is shielded metal arc welding (SMAW), which is also known as manual metal arc welding (MMA) or stick welding. Electric current is used to strike an arc between the base material and consumable electrode rod, which is made of steel and is covered with a flux that protects the weld area from oxidation and contamination by producing CO2 gas during the welding process. The electrode core itself acts as filler material, making a separate filler unnecessary. The process is very versatile, requ ...
See also:Arc welding, Arc welding - Development, Arc welding - Power supplies, Arc welding - Consumable electrode methods, Arc welding - Non-consumable electrode methods, Arc welding - Corrosion issues, Arc welding - Safety issues Read more here: » Arc welding: Encyclopedia II - Arc welding - Consumable electrode methods |
| |
| | | | | inert gas: Encyclopedia II - Arc welding - Non-consumable electrode methods Gas tungsten arc welding (GTAW), or tungsten inert gas (TIG) welding, is a manual welding process that uses a non-consumable electrode made of tungsten, an inert or semi-inert gas mixture, and a separate filler material. Especially useful for welding thin materials, this method is characterized by a stable arc and high quality welds, but it requires significant operator skill and can only be accomplished at relatively low speeds. It can be used on nearly all weldable metals, though it is most often applied to stainless steel and light metals ...
See also:Arc welding, Arc welding - Development, Arc welding - Power supplies, Arc welding - Consumable electrode methods, Arc welding - Non-consumable electrode methods, Arc welding - Corrosion issues, Arc welding - Safety issues Read more here: » Arc welding: Encyclopedia II - Arc welding - Non-consumable electrode methods |
| |
| | | | | inert gas: Encyclopedia II - Arc welding - Power supplies To supply the electrical energy necessary for arc welding processes, a number of different power supplies can be used. The most common classification is constant current power supplies and constant voltage power supplies. In arc welding, the voltage is directly related to the length of the arc, and the current is related to the amount of heat input. Constant current power supplies are most often used for manual welding processes such as gas tungsten arc welding and shielded metal arc welding, because they maintain a relatively constant curre ...
See also:Arc welding, Arc welding - Development, Arc welding - Power supplies, Arc welding - Consumable electrode methods, Arc welding - Non-consumable electrode methods, Arc welding - Corrosion issues, Arc welding - Safety issues Read more here: » Arc welding: Encyclopedia II - Arc welding - Power supplies |
| |
| | | | | | | | inert gas: Encyclopedia II - Arc welding - Corrosion issues Some materials, notably high-strength steels, aluminium, and titanium alloys, are susceptible to hydrogen embrittlement. If the electrodes used for welding contain traces of moisture, the water decomposes in the heat of the arc and the liberated hydrogen enters the lattice of the material, causing its brittleness. Electrodes for such materials, with special low-hydrogen coating, are delivered in sealed moisture-proof packagings. New electrodes can be used straight from the can, but when moisture absorption may be suspected, they have to be dried by baking (usually at 800-1000 °F) in a drying oven ...
See also:Arc welding, Arc welding - Development, Arc welding - Power supplies, Arc welding - Consumable electrode methods, Arc welding - Non-consumable electrode methods, Arc welding - Corrosion issues, Arc welding - Safety issues Read more here: » Arc welding: Encyclopedia II - Arc welding - Corrosion issues |
| |
| | | | | inert gas: Encyclopedia II - Breathing gas - Unwelcome components of breathing gases Many gases are not suitable for use in diving breathing gases. Here is an incomplete list.
Breathing gas - Argon.
Argon (Ar) is an inert gas that is more narcotic than nitrogen, so is not suitable as a diving breathing gas. It is used for dry suit inflation because of its good thermal insulation properties. Argon is much more expensive than air.
Breathing gas - Carbon dioxide.
Carbon dioxide (CO2) is produced by the metabolism of the human body and causes carbon dioxide ...
See also:Breathing gas, Breathing gas - Common diving breathing gases, Breathing gas - Individual component gases, Breathing gas - Oxygen, Breathing gas - Nitrogen, Breathing gas - Helium, Breathing gas - Neon, Breathing gas - Hydrogen, Breathing gas - Unwelcome components of breathing gases, Breathing gas - Argon, Breathing gas - Carbon dioxide, Breathing gas - Carbon monoxide, Breathing gas - Hydrocarbons, Breathing gas - Moisture content, Breathing gas - Gas detection and measurement Read more here: » Breathing gas: Encyclopedia II - Breathing gas - Unwelcome components of breathing gases |
| |
| | | | | inert gas: Encyclopedia II - Welding - Safety issues Welding, without the proper precautions, can be a dangerous and unhealthy practice. However, with the use of new technology and proper protection, the risks of injury and death associated with welding can be greatly reduced. Because many common welding procedures involve an open electric arc or flame, the risk of burns is significant. To prevent them, welders wear protective clothing in the form of heavy leather gloves and protective long sleeve jackets to avoid exposure to extreme heat and flames. Additionally, the brightness of the weld ar ...
See also:Welding, Welding - History, Welding - Welding processes, Welding - Arc welding, Welding - Gas welding, Welding - Resistance welding, Welding - Energy beam welding, Welding - Solid-state welding, Welding - Geometry, Welding - Quality, Welding - Heat-affected zone, Welding - Distortion and cracking, Welding - Weldability, Welding - Unusual conditions, Welding - Safety issues, Welding - Costs and trends, Welding - Notes Read more here: » Welding: Encyclopedia II - Welding - Safety issues |
| |
| | | | | inert gas: Encyclopedia II - Welding - Costs and trends As an industrial process, the cost of welding plays a crucial role in manufacturing decisions. Many different variables affect the total cost, including equipment cost, labor cost, material cost, and energy cost. Depending on the process, equipment cost can vary, from inexpensive for methods like shielded metal arc welding and oxyfuel welding, to extremely expensive for methods like laser beam welding and electron beam welding. Because of their high cost, they are only used in high production operations. Similarly, because automation and rob ...
See also:Welding, Welding - History, Welding - Welding processes, Welding - Arc welding, Welding - Gas welding, Welding - Resistance welding, Welding - Energy beam welding, Welding - Solid-state welding, Welding - Geometry, Welding - Quality, Welding - Heat-affected zone, Welding - Distortion and cracking, Welding - Weldability, Welding - Unusual conditions, Welding - Safety issues, Welding - Costs and trends, Welding - Notes Read more here: » Welding: Encyclopedia II - Welding - Costs and trends |
| |
| | | | | inert gas: Encyclopedia II - Welding - Quality Most often, the major metric used for judging the quality of a weld is its strength and the strength of the material around it. Many distinct factors influence this, including the welding method, the amount and concentration of heat input, the base material, the filler material, the flux material, the design of the joint, and the interactions between all these factors. To test the quality of a weld, either destructive or nondestructive testing methods are commonly used to verify that welds are defect-free, have acceptable levels of residual ...
See also:Welding, Welding - History, Welding - Welding processes, Welding - Arc welding, Welding - Gas welding, Welding - Resistance welding, Welding - Energy beam welding, Welding - Solid-state welding, Welding - Geometry, Welding - Quality, Welding - Heat-affected zone, Welding - Distortion and cracking, Welding - Weldability, Welding - Unusual conditions, Welding - Safety issues, Welding - Costs and trends, Welding - Notes Read more here: » Welding: Encyclopedia II - Welding - Quality |
| |
| | | | | inert gas: Encyclopedia II - Welding - History The history of joining metals goes back several millennia, with the earliest examples of welding from the Bronze Age and the Iron Age in Europe and the Middle East. Welding was used in the construction of the Iron pillar in Delhi, India, erected about 310 and weighing 5.4 metric tons.[1] The Middle Ages brought advances in forge welding, in which blacksmiths pounded heated metal repeatedly until bonding occurred. In 1540, Vannoccio Biringuccio publish ...
See also:Welding, Welding - History, Welding - Welding processes, Welding - Arc welding, Welding - Gas welding, Welding - Resistance welding, Welding - Energy beam welding, Welding - Solid-state welding, Welding - Geometry, Welding - Quality, Welding - Heat-affected zone, Welding - Distortion and cracking, Welding - Weldability, Welding - Unusual conditions, Welding - Safety issues, Welding - Costs and trends, Welding - Notes Read more here: » Welding: Encyclopedia II - Welding - History |
| |
| | | | | inert gas: Encyclopedia II - Decompression sickness - Signs and symptoms Bubbles can form anywhere in the body, but symptomatic sensation is most frequently observed in the shoulders, elbows, knees, and ankles.
This table gives symptoms for the different DCS types. "The bends" (joint pain) accounts for about 60 to 70% of all altitude DCS cases, with the shoulder being the most common site. Neurological symptoms are present in 10% to 15% of all DCS cases with headache and visual disturbances the most common. "The chokes" are rare and occur in less than 2% of all DCS cases. Skin ma ...
See also:Decompression sickness, Decompression sickness - Introduction, Decompression sickness - History, Decompression sickness - Predisposing factors, Decompression sickness - Signs and symptoms, Decompression sickness - Treatment, Decompression sickness - Common pressure reductions that cause DCS, Decompression sickness - Leaving a high pressure environment, Decompression sickness - Ascent during a dive, Decompression sickness - Ascent to altitude Read more here: » Decompression sickness: Encyclopedia II - Decompression sickness - Signs and symptoms |
| |
| | | | | inert gas: Encyclopedia II - Decompression sickness - Treatment Recompression is the only effective treatment for severe DCS, although rest and oxygen (increasing the percentage of oxygen in the air being breathed via an oxygen mask) applied to lighter cases can be effective. Normally this is carried out in a recompression chamber. In diving, a high-risk alternative is in-water recompression.
Oxygen first aid treatment is useful for suspected DCS casualties or divers who have made fast ascents or missed decompression stops. Most fully closed-circuit rebreathers can deliver sustained high concentrations of oxygen-rich breathing gas and could be used as an alternative to p ...
See also:Decompression sickness, Decompression sickness - Introduction, Decompression sickness - History, Decompression sickness - Predisposing factors, Decompression sickness - Signs and symptoms, Decompression sickness - Treatment, Decompression sickness - Common pressure reductions that cause DCS, Decompression sickness - Leaving a high pressure environment, Decompression sickness - Ascent during a dive, Decompression sickness - Ascent to altitude Read more here: » Decompression sickness: Encyclopedia II - Decompression sickness - Treatment |
| |
| | | | Page 1 » Page 2 « | |
| |
|
|
