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Welding method of nickel base membrane wall tube panel

A membrane-type wall tube screen and welding method technology, which is applied in the direction of welding equipment, electrode characteristics, arc welding equipment, etc., can solve the problems of nickel-based tube screen deformation, repair, large deformation, etc., and meet the requirements of ensuring dimensional accuracy and preventing Effect of deformation and reduction of repair amount

Active Publication Date: 2018-07-31
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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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

Method used

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  • Welding method of nickel base membrane wall tube panel
  • Welding method of nickel base membrane wall tube panel
  • Welding method of nickel base membrane wall tube panel

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Embodiment

[0038] Nickel-based membrane type wall tube panel welding method of the present invention comprises the following steps:

[0039]First, ten nickel-based tubes with a length of 2000mm and nine nickel-based flat steels with a length slightly shorter than the nickel-based tubes are arranged at intervals to form an arc-shaped tube panel; since the length of the tube panel is 2000mm, it can be installed on the tube panel At least two anti-deformation frocks, two anti-deformation frocks are arranged on the tube screen of this embodiment, and the two anti-deformation frocks are respectively arranged on the top and bottom of the tube screen; the manufacturing process of the anti-deformation frocks is: The clamping pieces adapted to the shape of the arc-shaped tube panel are respectively placed on the front and back of the same position of the tube panel along the direction perpendicular to the axis of the nickel-based tube, and the clamping piece is closely attached to the surface of t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/02B23K9/28
CPCB23K9/02B23K9/285
Inventor 奚旭张永光银润邦吕孝男
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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