Flange is a kind of disc parts, are the most common in the pipeline engineering, flange are paired and mating flanges which are connected with the valve used in pipeline engineering, the flange is mainly used for pipe connection in need of connecting pipes, all kinds of installation of a flange, the low pressure pipe flange can use silk, the use of more than 4 kg pressure welding flange with gasket, between two pieces of flange bolt flange in different pressure and different thickness and use different bolt
In the welding of stainless steel elbow, by repeated heating will precipitate carbide, carbide refraction will reduce corrosion resistance and mechanical properties, so in the welding of stainless steel elbow, do not repeat heating, to prevent the refraction of carbide affect the corrosion resistance and mechanical properties of stainless steel elbow
In order to prevent the result of the heat corrosion between eyes, welding current when welding the stainless steel elbow shoulds not be too big, is about 20% less than that of carbon steel electrode, arc shoulds not be too long, interlayer cold quickly, with narrow bead advisable so when you use the stainless steel elbow electrode for welding reasonable control welding current, prevent excessive current corrosion between eyes, affect the welding quality of stainless steel elbow
Eccentric reducer in the actual production add different elements of different functions and intensity, using certain production standard and the way to add, in which the use of a certain performance. Eccentric reducer characterized by carbon intensity is significantly higher than the same amount of carbon steel, has good toughness and plasticity, good weldability and corrosion resistance, etc. In order to improve and enhance the performance of the steel on the basis of the carbon steel to join other alloying elements, such as silicon, manganese, chromium, nickel, tungsten, vanadium, titanium, etc., this kind of steel is alloy steel.

Eccentric reducer according to difference of alloy elements, have different properties, such as high wear resistance, corrosion resistance, good low temperature resistance, good special features such as high magnetic. The center of the eccentric reducer as the main body section, straight pipe ends for eccentric, main body between a straight pipe section and eccentric eccentric reducing transition section, eccentric reducer the bottom line is straight line remains unchanged; Eccentric reducer of preparation methods are classified using multiple sets of mould, eccentric reducing in the metal tube directly, first set aside the main section in the middle of the metal one, again according to the request of tapered Angle, using multiple sets of hierarchical mold molding, step by step to suppress and into. Using this invention method processing eccentric reducer, the whole root eccentric size head without weld; Eccentric size head as a special tube, used in highly corrosive liquid, can extend the service life of eccentric size head, especially used as the casing of eccentric water distribution device, because there is no weld, will not be in the welding joint corrosion cracking; Production process is flexible, can process any diameter, eccentric straight pipe section eccentric size head of any length.
Eccentric size head size of different connection pipe, also different industry is also different. In electric power, mining, metallurgical and other industries, the material of the conveyor, output, are using at close range, high pressure conveying pipeline under considerable pressure, and sustained serious wear and tear, single material pipeline is very difficult to meet the requirements of this condition, especially the elbow, concentric reducer, such as stamping elbow pipe fittings, by considering its use of security, and service life, focus on improving pipe lined with toughness, impact resistance, and abrasion resistance. The overall strength of the pipe and elbow should also be considered.
Before the eccentric head is bonded, wipe the side of the socket and the outside of the socket with a dry cloth. When oil is stuck to the surface, clean it with acetone. The following points should be noted:
1. Control caliber: DIN standard, 3A/IDF standard, ISO standard;
2. International industrial standards: DIN, ISO, SMS, 3A, IDF, etc.
3. Product materials: 304, 316, 316L stainless steel;

（from:168 forgings net）