Device for correcting deformation of welded pipe fitting

Abstract

The invention relates to a device for correcting deformation of a welded pipe fitting and belongs to the field of machinery. The device is used for correcting deformation of the welded pipe fitting and comprises two symmetrical flat plates with semi-circular arcs, and the sides, with the semi-circular arcs, of the two flat plates with the semi-circular arcs are butted to form a complete circle. The two flat plates provided with the semi-circular arcs are buckled on the deformed pipe fitting, so that the deformed pipe fitting is corrected into a round pipe. According to the method, the deformed pipe fitting is corrected into the round pipe by adopting a mechanical cold correction mode, so that the problem of long period caused by heating the pipe fitting when the round pipe is corrected by adopting a hot hammering mode is avoided, and the possible change of the metallographic structure of the pipe fitting in the heating process is also avoided.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a device for correcting deformation of pipe fittings after welding. Background technique [0002] For large steam turbine cylinder castings, due to functional requirements, many transitional fittings need to be welded on the outside of the cylinder block, and these transitional fittings are then connected to the steam inlet and outlet pipes. Since the transition pipe fittings need to be preheated when they are welded to the casting, the preheating temperature is generally around 200°C, and there are reasons such as uneven welding heat input during the welding process of the transition pipe fittings, which can easily cause deformation of the transition pipe fittings. The traditional correction method after the transition pipe is deformed is to correct it by means of flame and hammering. The traditional correction method first needs to measure the deformed part of the pipe fittin...

AI Technical Summary

Problems solved by technology

This method is easy to cause local unevenness of the pipe fittings, and the heating and cooling cycle is very long. If the size correction is not up to standard, it will take a long time to re-correct it again.

Moreover, the metallographic structure of the heating part will change during the heating process, and the mechanical properties of the casting will be affected, which will bring safety hazards to the use of the casting.

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