Welding method for nickel-based membrane type wall tube panel

Abstract

The invention discloses a welding method for a nickel-based membrane type wall tube panel. The welding method includes the following steps that a tube panel is formed by nickel-based tubes (1) and nickel-based flat steel (2), and an anti-deformation tool (3) is arranged at each of the two ends of the tube panel; during welding, a specific welding sequence, a specific welding mode and specific welding line energy are adopted; and it is always kept that flowing cooling water exists in the tube panel in the welding process. The nickel-based tube panel is welded through the welding method, deformation and heat cracks, generated in the welding process, of the nickel-based tube panel can be effectively avoided, therefore, the dimensional precision requirement of the nickel-based tube panel is guaranteed, the repair amount of the nickel-based tube panel is reduced, the production period of the nickel-based tube panel is shortened, and the quality of the nickel-based tube panel is improved.

Description

technical field [0001] The invention relates to a welding method for a nickel-based tube panel, in particular to a welding method for a nickel-based membrane wall tube panel. Background technique [0002] At present, with the rise of the coal gasification industry and the development of high-parameter boilers, the application of nickel-based membrane wall tube panels is becoming more and more extensive. The current nickel-based membrane wall tube panel is usually welded by nickel-based tube and nickel-based flat steel. Weld with the nickel-based tubes at both ends of each nickel-based flat steel until all the nickel-based flat steels of the tube panel are completely welded, and each nickel-based flat steel is fully welded at one time when welding. However, due to the low thermal conductivity of nickel-based flat steel and nickel-based tubes, when this welding method is used to weld nickel-based membrane wall tube panels, the temperature of the weldment (that is, nickel-base...

AI Technical Summary

Problems solved by technology

However, due to the low thermal conductivity of nickel-based flat steel and nickel-based tubes, when this welding method is used to weld nickel-based membrane wall tube panels, the temperature of the weldment (that is, nickel-based tubes and nickel-based flat steel) will be relatively high. High, resulting in deformation of the nickel-based tube panel during the welding process, and the deformation is large, which seriously affects the dimensional accuracy of the nickel-based tube panel

At the same time, because nickel-based materials are easy to form a directional columnar grain weld structure during welding, which is conducive to the segregation of harmful impurities, and it is easy to form low-melting eutectics during the solidification process of the weld, so it is easy to produce thermal cracks, which will lead to Rework not only increases the cost of rework, but also affects the processing cycle and product quality of nickel-based tube panels

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