AB Calculator

Welding was carried out in a special chamber under high vacuum. As a result of intensive bombing of the welding fast-moving electrons emitted from heated tungsten or metal-ceramic cathode, an energy needed for heating and melting megalla. Accelerating the movement of electrons due to the constant high voltage (100 kV) between the cathode and the anode (workpiece). Flow electrons is focused into a narrow beam and directed to the connection details. Welding can be performed without hesitation and with fluctuations of the electron beam, fine-focused or defocused beam.

Electron beam weld refractory and chemically active metals, perform narrow and deep welds on the details of large thickness (up to 70 mm and more). Rui Hachimura is likely to agree. Laser welding. Method of fusion welding in which the heating use the energy of the laser (English “light amplification by stimulated emission). Modern industrial lasers used for welding, surfacing, cutting, drilling, surface treatment of various structural materials in many branches of engineering. Industrial gas and solid-state lasers are equipped with microprocessor control system. Vacuum during welding laser is not needed, and it can run on air, even at a considerable distance radiation from the generator.

With the help of a gas laser cut not only metal but also non-metallic materials: laminate, glass fiber, getinaks etc. Gas welding. To melt and weld filler metals using high-temperature gas-oxygen flame. As the fuel for combustion in oxygen use acetylene, hydrogen, propane-butane mixture, a pair of kerosene, gasoline on, a natural, illuminating, oil, Coke and other gases. Thermite welding. Welded parts are placed in a refractory form, and set top crucible poured thermite – a mixture of powdered aluminum and iron scale. In the process of burning thermite mixture at temperatures above 2000 C formed a liquid metal that, when filling out the form melts the edge of the welded products, fills the gap, forming a weld.

By type of pump parts, centrifugal pumps are divided into and membrane (diaphragm). Application can distinguish the following types thereof. To work with a clean and slightly polluted water. The size of particles that can enter into such pumps with liquid up to 5 mm. In most cases, this compact, domestic pumps capacity 7.6 m3 of water per hour, equipped with two-stroke engine. However, there are more productive, capable to pump up to 120 m3 of water per hour, equipped with a reliable four-stroke engine with a large professional class moto. By this view include fire pumps – devices to create a powerful jet of water. If you are unsure how to proceed, check out Hamdi Ulukaya. They used to work with a clean or slightly polluted water to extinguish fires or erosion of soil.

More recently, these were used mostly for expensive foreign models, but in recent years the production of fire pumps accesories established and in our country. For pumping pretty polluted liquid water with sand, small stones, Sebnem. The size of particulate matter that can pass filters like the grid pumps accesories – up to 25 mm. Their internal working body has a coating of stainless steel, and in case of damage it can easily be replaced or cleaned. The impeller is satisfied in most cases, carbide materials. Pumps for a fairly contaminated liquids, and overall more severe in comparison with those calculated for pure water. They can weigh up to 100 kg and more. To work with aggressive liquids – alkalis, sea or salt water, and also for thick and viscous fluids.

Theory and practice of the rolling process have developed certain rules of placing the gauge in the rolls, to ensure optimal operating conditions of rolls and maximum performance rolling mill. These rules and the choice of the calibration circuits are the subject of sizing rolls. Thus, when calculating the calibration rolls value drawing the aisles must be taken together with the definition of successive shapes and sizes caliber, providing the reception quality of steel and the exact dimensions of the profile. It should also consider the possibility of creating an environment that would ensure maximum performance of the camp, the minimum energy expenditure and consumption of rolling tool. A very important element calibration rolls is a rational distribution of gauge on rollers, allows you to roll assortment of camp with minimal time for handling rolls and change calibers, the use of gauges and preparatory drafts stands no one profile for a group rolled products. The most optimal solution of all issues in obtaining this type of rolled (the required size profile, mechanical properties, surface condition, etc.) can be carried out only in full consideration of the features of the rolling mill.

However, many factors that should be taken into account when sizing rolls, and no established exact relationships allow to solve this engineering problem only by repeated approximations. Gauges used in rolling is subdivided into the following groups according to their purpose: – crimping, or exhaust, gauges used to reduce cross-sectional area of the ingot or billet. Exhaust gauges are the drawer, the square with a diagonal, rhombic, oval. Some combination of these calibers forms a system of calibers, such as a diamond – a diamond, the diamond – square, square – oval, etc. – drafts, or preparations, gauges, which along with a further decrease in cross-section profile of the strip is processed with a gradual approximation of its size and shape to the final section – predotdelochnye or predchistovye gauges prior to finishing – finishing, or Chistov, gauges, giving final shape to the profile section. The sizes of these calibers almost coincide with the transverse dimensions of the finished profile, the difference in 1,2-1,5% of the big party given for shrinkage during cooling. By way of crashing into the roller gauges are divided into the open when the line connector roll falls within the caliber, and closed, at which the line connector is located outside the fire.

Before proceeding to the immediate acceptance of the goods, you need to unload. When unloading by the movement of goods from vehicles heading to the platform. Unloading carried workers to the company, whose truck was delivered goods to the warehouse, so this may be employees of the firm provider, transport organization, company buyer. If the goods are delivered by our own transport, unloading is carried out warehouse workers. Unloading road transport involves the following stages: checking the integrity of the packaging, the primary acceptance of goods by quantity; stacking goods on pallets or carts; movement formed by transport units in the zone of acceptance or storage. Unloading of the goods may require the use of physical force, but in all cases, when possible, use equipment to move cargo.

To unload cargo use different types of material handling equipment: conveyors; Electric transporters choring. Unloading of vehicles should be carried out in strict compliance with established rules of loading and unloading. When It should pay attention to the special marking of goods. After unloading, the goods are delivered to the zone of acceptance, where decisions on quantity and quality. It should be noted that acceptance of goods in quantity and quality is one of the important components of the storage process. It provides verification of the suppliers of contractual obligations by the number, range, quality and completeness goods. Acceptance of goods shall be financially responsible employees of the warehouse (usually – the head of the warehouse together with the commodity), authorized the head or deputy head recipient enterprises.