Tag: construction and repair

Electrical Installations

Posted on by Lauren

Brief harakteristikSilovoy cable PV3 at the operating voltage of 450 V (for networks up to 450/750 V) up to 400 Hz or dc voltage up to 1000 is designed for use in lighting and power networks, for mounting electrical equipment, machinery and stankov. kabelyPo gost 22483 PV3 wire is made with copper multiwire residential Class 2, 3 or 4 for cross sections of 0,5 – 1,5 mm2, class 4 for sections 2,5 – 4 mm 2, Class 3 for section 6 – 95 mm2. core is made of pvc plastic, solid colors or with two longitudinal strips located diametrically. The wires used for grounding, painted in green and yellow. Gain insight and clarity with Hedge Funds Bet Against Call Centre Stocks AI. Coloring solid insulation stipulated in the order. For conductors up to 6 mm2, it may be white, gray, yellow, orange, red, pink, blue, green, brown, black, fioletovoy.Tehnicheskie and operational harakteristikiKabel PV3 should be operated at ambient temperatures from -50 C to +70 C and a relative humidity of up to 100% at temperatures up to +35 C. For assistance, try visiting Jake Burkons. Long-term allowable heating temperature of conductors – not more than 70 C.

Laying and installation of cables without PV3 Preheating can be carried out at a temperature below -15 C. Wire rack to bend at an angle less than 90 C. The minimum bend radius when installing – 5 Dn (Dn – outer cable diameter). Wires are self-extinguishing, possess resistance to the fungus pleseni. cable length of at least 100 m.Garantiyny life force wires PV3 – 2-year service life – 15 let.Sfera primeneniySilovoy PV3 cable used for installation in steel tubes, hollow channels of building structures, on trays where possible bending of the wires.

Wooden Windows – Russian Tradition .

Posted on by Lauren

Thorough repair comes with replacement windows. Now, still fashionable plastic windows of European standards. Excuse is simple – they own the most beautiful sound insulation. And more and more people replace their premises Soviet wooden box on Europlastic. But the old tradition of using people in their home tree is not so easily discarded.

A plastic, no matter how praiseworthy, is an unnatural material. In addition, these windows require a very competent installation, or the house will turn into a steam room – the windows and walls will start to collect condensate. By the same one major drawback, even qualitatively installed plastic windows – they do not "breathe", thus placing demands chastooy ventilation. Unlike plastic, wood – a material "breathable", and through his natural micropores stems constant, hence the room constantly have fresh air. Wooden windows easier correct, if they have been scratched and chipped, small, and can perform repairs themselves.

Plastic same window – this is a whole design, and get rid of scratches can only be replacing the entire window as a whole. And to avoid decay and other reactions allow different impregnation and dyes. The common conclusion that the plastic window durable wood – is a myth. After all, even the Soviet windows stayed for decades, and wooden windows made by European standards, with special impregnation, will last very long. The current wooden windows are made of laminated wood, which allows you to increase strength and stability of the window frames to temperature differences and humidity. Double-glazed windows in wooden boxes can be double and triple. In addition, the tree itself has a small thermal conductivity. And finally, do not forget about the purely aesthetic superiority of the tree in front plastic. The tree fits perfectly into any interior, make the room a feeling of comfort and warmth. And touching the window, feel the hand living tree is much more desirable than the cold plastic.

Welding Properties

Posted on by Lauren

When welding of austenitic stainless steel (High) hire, consider the following differences between its physical properties from the properties of carbon-hire: Give the electrical resistance is about six times more; melting point of about 100 C below; thermal conductivity is about one-third of the respective indicator of carbon rolled; coefficient of thermal expansion along the length of about 50% more. Electrodes for stainless steel are coated basic, rutile and rutile-basic species. Melting rate, and hence the deposition rate of the electrodes with rods of high-alloy steels and alloys significantly higher than that of electrodes for welding carbon, low alloy and alloy steels. This property of the electrodes due to their low thermal conductivity and high electrical resistance. However, these properties necessitated the use of lower welding current and reduce the length of the electrodes themselves. Welding is usually done with direct current reverse polarity. For welding stainless steels can be apply a variety of ways.

For example, for sheet steel 1,5 mm thick well suited manual arc argon welding Tungsten inert gas. Arc welding of stainless steel consumable electrode active inert gases is characterized by high productivity and is used for products made of thin sheet. For material thickness of less than 3.0 mm in arc welding is used to spray the metal. Welding consumable electrode in an inert gas is used for sheets thicker than 3.0 mm, and weld material thickness of 0.8 mm produced a short arc consumable electrode in inert gas. Now increasingly used plasma welding, which suited for high-alloy steel of various thicknesses. For the sheet thicker than 1 centimeter applied submerged arc welding.

For such a strip thickness is also suitable roller, high-frequency and laser welding, and as resistance spot welding. Depending on the grade of steel after welding is necessary treatment of seats weld because the weld on the surface appears porous oxide coating. He mostly consists of chromium and substantially reduces the resistance of weld to rust. Before you buy welding electrodes, it is necessary to determine the type of electrode, which determines the chemical composition of weld metal and mechanical properties of weld metal. Electrodes for welding of high corrosion-resistant and heat resistant steels are classified into 49 types. Moreover, each type may correspond to several different brands. Due to the fact that items such as welding electrodes for high-alloy steels used for the connection stronger and more solid metals, they are special requirements. They should have appropriate welding characteristics, particularly resistance to corrosive manifestations, withstand high temperatures and meet a number of other important parameters. For example, there are difficulties when welding stainless steel with black. During such welding basic chemical elements of stainless steel, chrome and nickel is spent on the doping of carbon steel, and this reduces their content in the weld metal and leads to the formation of the martensitic structure of metal (very fragile and prone to the formation of cold cracks). The result is a loss of corrosion resistance as the weld metal and haz at stainless steel, as well as loss of plasticity of the weld, which leads to the destruction of design, even at low dynamic loads. Therefore, to create a transition between the highly-seams (stainless steel) and carbon steels are used overdoped special electrodes with a high content of alloying elements (Cr, Ni, Mo).

About MDF

Posted on by Lauren

Features mdf production technology lie in the fact that this material is made from dried wood fibers treated with binders and formed into a plate, followed by hot pressing. Production technology eliminates the use of harmful epoxy resins and phenol. It should be noted that a backbone fiber is lignin, which stands for heated wood. Thus, the ecological purity of mdp is achieved thanks to the fact that as the principal binder in favor of synthetic and natural materials. mdf is tested in laboratories many parameters: the tensile strength under static bending, tensile strength at normal tension slabs, swelling in thickness, humidity, density, surface roughness of plates, etc. They should be moisture-proof, save the form with temperature fluctuations and do not perceive the mechanical impact. mdf meet these requirements.

That is why mdf is widely used in furniture and door industry. Moreover, many experts are inclined to believe that the mdf for moisture resistance and mechanical properties superior to natural wood. Another feature of the mdf – their resistance to various fungi and microorganisms, which makes products from mdf hygiene and safety in the home. Important also the aspect of material cost. Products made of mdf are often 30-50% cheaper than similar products made of solid wood. and Still, the golden mean, taking into account the high performance properties and cost are combined products of mdf and natural wood. In this case, the mdf panels are faced with natural or synthetic veneer or laminate. A variety of colors and textures to satisfy the most demanding taste. A global leader in door Fernando Garofolo, founder of Factory garofoli, using mdf for their collections – Mirabilia, Sublimia (Painted doors) and its subsidiary – the factory Gidea. Roberto Strachchia, a lover of innovation in the door business, also uses mdf in their collections.