Method for repairing internal cracks of weld joint of container device

Abstract

The invention discloses a method for repairing internal cracks of a weld joint of a container device. The method comprises the steps of S1, detecting the weld joint of the container device so as to determine the positioning depth of the cracks in the weld joint; S2, removing the weld joint in which the cracks are determined according to the positioning depth of the cracks in the weld joint, so as to form a weld joint groove for removing the cracks in the weld joint; S3, filling and welding the weld joint groove; S4, thermally processing the repaired weld joints subjected to filling and welding. With the adoption of the method for repairing the internal cracks of the weld joint of the container device, the cracks of various types in the weld joint can be effectively repaired, and the completeness of the performances of the container device can be maintained.

Description

technical field [0001] The invention relates to the technical field of crack repair, in particular to a method for repairing internal cracks in welds of header equipment. Background technique [0002] At present, supercritical units and ultra-supercritical units have been widely used in the field of power generation due to their remarkable energy-saving and environmental improvement effects, as well as their high thermal efficiency. In addition, because the new ferritic heat-resistant steel P92 has better high-temperature strength and creep resistance, better corrosion resistance and oxidation resistance, it is used in high-temperature header equipment of ultra-supercritical units (including It is more and more widely used in the manufacture of tanks and corresponding connecting steam pipes, as well as welding joints connecting headers and headers and headers and steam pipes. [0003] Usually, the high-temperature and high-pressure headers of ultra-supercritical units made ...

AI Technical Summary

Problems solved by technology

[0003] Usually, the high-temperature and high-pressure headers of ultra-supercritical units made of P92 (hereinafter referred to as P92 headers) have complex structures, high operating parameters (605°C / 26.25MPa) and high risks

In some boilers actually in service, it has been found that there are microcracks, cracks and other excessive defects in the welded joints of the P92 header and its current installation welds, and as the service time prolongs, the cracks tend to expand continuously, making the header There are great hidden dangers and risks, which seriously affect the safe operation of boiler equipment

In addition, because P92 is a high-alloy material, it has a certain tendency to weld cold cracks, which makes its weldability poor, which makes it very difficult to eliminate internal defects in welded joints, especially micro cracks.

Images