Pressure Vessel And Boiler Steel Platewelding Process

Pressure vessel steel With the power, chemical and petroleum and other types of reactors, boilers, high pressure vessels to the direction of large-scale development of large parameters, its structure is also gradually by the use of steel plate welded structure, to the use of large forgings forging structure development of. Pressure vessels are further developed for high-purity, high-toughness (see reactor pressure-resistant shell steel).Pressure Vessel and Boiler Steel Plate

Pressure vessel welding joints are divided into four categories, the purpose is in the design, manufacture, maintenance, management can be treated separately, so as to ensure quality. (Except for the longitudinal joint of the multi-layer wrapping container laminates), the annular joint of the ball-shaped head and the cylinder, all the welded joints in the male cap, and the insert- Body connected to the joints, are Class A welded joints. The joint of the shell part, the joint of the small end of the tapered head and the joint, the joint of the long neck flange and the joint are all class B welded joints, but they are specified as A, C and D Except for welded joints.Pressure Vessel and Boiler Steel Plate Flat cover, tube plate and cylinder non-docked connection, flange and shell, connected to connect the connector, the inner head and cylinder lap joints and multi-layer dressing container layer layer longitudinal joints, are Class C Welded joints. The joints, such as manholes, flanges, reinforcing rings, etc., are connected to the housing, all of which are of Class D welded joint, except for welded joints of Class A and B.Pressure Vessel and Boiler Steel Plate

Weld is the largest pressure in the pressure vessel joints, it is generally required to use double-sided welding or to ensure full penetration of the single-sided weld; weld working stress is generally half of Class A. In addition to the butt welds that can be used for double-sided welding, single-sided welding with gaskets can also be used. In medium and low pressure welds, the force of class C joints is small, usually using fillet welds. For high pressure vessels, containers containing highly toxic media and cryogenic vessels should be fully welded joints. The weld is taken over the weld with the container. Stress conditions are poor, and there is a high stress concentration. In the rear wall of the container in this kind of welds is quite large, the residual stress is also large, easy to produce cracks and other defects. Therefore, in this container D-type welds should be taken through the welding of welded joints. For low-pressure containers can be used for local penetration of single or double-sided angle welding.Pressure Vessel and Boiler Steel Plate