What are the main processes of corrugated compensator fine welding?
Corrugated compensator fine welding process is as follows: the size of the corrugated pipe straight edge section inside and outside diameter PR should be in line with the design requirements. The size and technical requirements of the connection flange and end pipe of the corrugated compensator and the pipe should conform to the corresponding standards. End pipe connection, both ends of the pipe mouth should be opened 30 degrees ± 2.5 degrees of bevel. The end pipe of the corrugated compensator is a rolled steel plate welded pipe, the end pipe of the outer end of the perimeter tolerance and roundness tolerance should be in line with the tolerance table. Corrugated pipe and end pipe (or flange) connected to the ring weld should be tungsten arc welding or fusion arc welding, corrugated pipe single wall thickness greater than 2mm can be used when the electric arc welding. When assembling the bellows compensator should take protective measures to prevent the welding arc burn through the bellows and welding slag splash to the bellows. Expansion joint (compensator) of each part of the weld shall not have cracks, porosity, slag and other defects, the biting depth shall not be greater than 0.5mm. After the weld of the corrugated compensator pressure seam, the pressure test should be pressure weld, the test pressure is 1.5 times the design pressure. According to the volume of the expansion joint (compensator) size, pressure 10-30min, check the expansion joint (compensator) parts have no leakage, the maximum wave distance under pressure and the ratio of the wave distance before pressure does not exceed 1.15.
Corrugated compensator group welding should be the appearance and geometric size inspection. Compensator two end face coaxiality tolerance; when the nominal diameter is less than or equal to 500mm, for 5mm; when the nominal diameter is greater than 500mm, for the nominal diameter of 0.01, and less than or equal to 10mm. compensator two end face and the main axis verticality tolerance for the nominal diameter of 0.01, and less than or equal to 3mm. expansion joint (compensator) factory inspection are mainly the above appearance inspection, geometric Dimensional inspection and pressure test. For special requirements of the expansion joint (compensator), according to the use of working conditions, process requirements, etc., according to the agreement between the supply and demand for other methods of inspection, such as airtightness test, leakage and coloring, nondestructive testing, etc. Bellows compensator is a compensation element. The effective expansion and contraction deformation of its working body bellows is used to absorb the dimensional changes caused by thermal expansion and contraction of pipes, ducts and vessels, or to compensate for axial, lateral and angular displacements of pipes, ducts and vessels. It can also be used for noise and vibration reduction. This type of compensator has a wide range of uses in modern industry.
