Welding method for annular header

Abstract

The invention discloses a welding method for an annular header, which is capable of greatly reducing stress concentration. According to the welding method, all oblique nozzles are arranged and fixed at first, and then welding is started; and welding is divided into three steps: 1, fixed-position welding, wherein tungsten inert gas welding is adopted in the fixed-position welding, two sections of connected arc welding areas are arranged at the butt-joint part of each adjacent oblique nozzles and have different arc lengths, the relatively long arc welding area is a first arc welding area, and the relatively short arc welding area is a second arc welding area; 2, backing welding, wherein tungsten inert gas welding is adopted in the backing welding, the annular header is provided with six welding areas in total, which are a welding area A, a welding area B, a welding area C, a welding area D, a welding area E and a welding area F, and the six welding areas are clockwise arranged; and 3, welding seam-filling welding, wherein welding is carried out by virtue of a manual electric arc welding method in the welding seam-filling welding, odd layers and even layers are reversely welded, and so on, until the filling welding is completed. The welding method disclosed by the invention has the advantage of basically no stress concentration.

Description

technical field [0001] The invention relates to a welding method of an annular header. Background technique [0002] Coal gasification is a clean coal utilization technology that can avoid the pollution caused by direct coal combustion. Coal gasification uses coal with high energy efficiency. Through coal gasification, solid coal raw materials are converted into clean gas raw materials, and then processed into oil, chemical products or electricity. Advanced coal gasification technology is one of the key technologies for efficient and clean utilization of coal. [0003] KBR transport bed (TRIG) coal gasification technology is one of the most efficient and clean coal conversion and utilization methods in the world. This technology adopts high circulation ratio to achieve uniform mixing and improve the utilization rate of coal; air gasification and oxygen can be used The two modes of gasification are respectively applied to power generation and the production of downstream pro...

AI Technical Summary

Problems solved by technology

The assembly of the ring header and the equipment is the most difficult and key point in the manufacture of the whole equipment. After pouring refractory material, the R connecting pipe connecting each header and the shell has an inner diameter of only Φ21mm, and the temperature and flow rate of the medium in the ring header are very high. High, if the assembly accuracy of the ring header cannot meet the requirements, and the welding deformation cannot be effectively controlled, it will affect the assembly quality of the equipment, thereby affecting the normal operation of the equipment

The ring header produced by the commonly used ring header welding method will produce stress concentration, which will affect the quality and service life of the ring header

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