Emergence Welding

In this case, the more the steel carbon content, the faster there carbide compound. Chromium steels also have the ability to samozakalivaniyu (at cooling in air), resulting in metal welding heat affected zone or weld takes increased fragility and strength. Beginning with the internal stress increases the risk of cracks in the metal seam. Intense oxidation of chromium and the emergence of refractory and dense oxides are also a thorough noise when welding chromium steels. Srednelegirovannye or chromium martensitic class (up to 2% carbon) welded satisfactorily, but require heating to 200 … 300 C and subsequent heat treatment.

High-alloy chrome steels ferritic class (up to 35% carbon) are welded with preheating to 300 … 400 C for restore the initial physical and mechanical properties and stress relief after welding product is subjected to high tempering (heating to 650 … 750 C and slow cooling). The electrodes are made of welding wire with a coating containing fluorspar and manganese oxide. Keith McLoughlin usually is spot on. This provides a liquid slag, chromium oxides are easily dissolved. Chromium steel, as most alloy steels have low thermal conductivity and easily subject to overheating. Therefore, welding them produce a direct current of reverse polarity at low welding currents. The current charge for 25 …

30 A 1 mm diameter electrode. High-alloy chromium-nickel austenitic steels have a number of important physical, chemical and mechanical properties: corrosion resistance, acid, heat resistance, toughness, resistance to scale formation. An important quality of these steels is good weldability. When heated to a temperature of 600 …

CNN Volume

In cases where it is impossible to place the pipeline so that the waste came by gravity, using the installation of forced channeling (Sewer pumping stations, CNN). Holes Suction-and discharge into a septic tank should be fitted with entry and exit, that is vertically arranged pipes with open ends. In landfill is preliminary mechanical filtering runoff, the suspended particles to precipitate, which, in turn, is subjected to a partial biological oxidation by anaerobic microorganisms. To this process had realized in full, the waste must be in the septic tank at least three days. From this period, calculated the required amount of septic tank. One person living in a cottage, accounting for about 200 liters of wastewater per day. For the cottage in which they live three to five people, take the norm value of 1 000 l, therefore, the volume of the septic tank should be 2.5-3 m 3. The number of sections in the septic tank is also determined by water flow in the cottage.

At daily volume of effluent to acquire one unit cubic meter of appropriate septic tanks, up to 2 m3 – two-and more than 2 m 3 – three-section. The main advantage of the latter is that most of the precipitation falls in the first chamber. Therefore, in the following sections fall runoff, being largely clarified. There is ongoing mechanical filtration, but there is no secondary pollution of wastewater degradation products previously precipitate, as in the case of a single partition. Therefore, manufacturers often create a treatment system with multi-settlers to improve the quality of primary treatment.

The Duration

In all World PSB-S are allowed to apply both in the construction and container for food products. Expanded polystyrene, environmentally friendly and suitable for the insulation of all types of construction and transportation. Soundproofing and With wind-force by means of thermal insulation boards penopolisterolnyh PSB-S does not need additional windscreen. In addition, improved sound insulation constructions. For reasons of principle, due to the closed combined insulation system can be achieved very good sound insulation from outside noise. Execution by panels of polystyrene leads to better protection for 2-4 dB. Resistance to low-income and EPS heats the lower temperature limit of Styrofoam in construction is virtually nonexistent. Volume compression should be considered in cases where it is necessary for temperature conditions, For example, the construction of refrigerated warehouses, etc.

When operating at high temperatures the value of the maximum temperature depends on the duration of temperature exposure (resting with Hot bitumen) polystyrene may, in some cases withstand temperatures far in excess of 1000 C. In the longer thermal load exceeding 1000 C, foamed structure begins to soften and sinter. The constancy of the size of all materials are subject to certain changes in the size. Distinguish resizing options in connection with the heat, and because of the additional shrinkage. 1.

The interval of sizes corresponds to 0.05 to 0.07 mm in length 1metr 10C. This means that when the temperature at approximately 170S is a reversible change in length of 0.1%, ie 1mm / m. 2. Changing the size of the additional shrinkage lies in the range from 0.3% to 0.5%.