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Welding process of water feed pump of nuclear power plant conventional island

A welding process and main water pump technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of difficult welding and preheating of outlet pipes, reduce the probability of defects, eliminate the tendency of cracks, and save energy. resource effect

Inactive Publication Date: 2015-03-18
SHANGHAI KAIQUAN PUMP IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the difficulty in welding the pump cylinder of the main feedwater pump and the inlet and outlet pipes, and difficult preheating, so as to provide a welding process for the main feedwater pump of a nuclear power conventional island

Method used

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  • Welding process of water feed pump of nuclear power plant conventional island
  • Welding process of water feed pump of nuclear power plant conventional island

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Groove processing, the grooves are respectively processed at the joints of the inlet pipe, outlet pipe, side plate and rib plate and the pump body;

[0070] (2) Preheat the grooves on each component before welding, and the preheating temperature is controlled at 150°C to 300°C;

[0071] (3) After the preheating is completed, welding is carried out. Firstly, the manual electrode is used for welding. The manual electrode adopts DC reverse connection, the welding current is 80A, the welding voltage is 18V, and the welding speed is 150mm / min. / 3, stop welding, and then continue welding with MIGA welding, until the welding is completed, continue welding with MIGA welding, adopt DC reverse connection, welding current 180A, welding voltage 24V, welding speed 200mm / min.

[0072] (4) Inspection after welding.

Embodiment 2

[0074] (1) Groove processing, the grooves are respectively processed at the joints of the inlet pipe, outlet pipe, side plate and rib plate and the pump body;

[0075] (2) Preheat the grooves on each component before welding, and the preheating temperature is controlled at 150°C to 300°C;

[0076] (3) After the preheating is completed, welding is carried out. First, the manual electrode is used for welding. The manual electrode adopts DC reverse connection, the welding current is 90A, the welding voltage is 19V, and the welding speed is 160mm / min. / 3, stop welding, and then continue welding with MIGA welding until the welding is completed, continue welding with MIGA welding, adopt DC reverse connection, welding current 190A, welding voltage 25V, welding speed 215mm / min.

[0077] (4) Inspection after welding.

Embodiment 3

[0079] (1) Groove processing, the grooves are respectively processed at the joints of the inlet pipe, outlet pipe, side plate and rib plate and the pump body;

[0080] (2) Preheat the grooves on each component before welding, and the preheating temperature is controlled at 150°C to 300°C;

[0081] (3) After the preheating is completed, welding is carried out. Firstly, the manual electrode is used for welding. The manual electrode adopts DC reverse connection, the welding current is 100A, the welding voltage is 20V, and the welding speed is 170mm / min. / 3, stop welding, and then continue welding with MIGA welding, until the welding is completed, continue welding with MIGA welding, adopt DC reverse connection, welding current 220A, welding voltage 26V, welding speed 230mm / min.

[0082] (4) Inspection after welding.

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Abstract

The invention discloses a welding process of a water feed pump of a nuclear power plant conventional island. The welding process comprises the following steps: (1) machining a bevel; (2) preheating before welding; (3) welding; (4) detecting after welding, wherein the preheating temperature before welding is 150-300 DEG C, wherein the welding step comprises the following sub-steps: a, welding the bevel of each component by using a manual welding rod, and stopping welding when the bevel is welded to 1 / 3 of the thickness; b, continuously welding the bevel of each component by using gas metal arc welding until the welding is finished. The production efficiency is greatly improved by using the manual arc welding and the gas metal arc welding method.

Description

technical field [0001] The invention relates to a welding process of a water pump, in particular to a welding process of a nuclear power conventional island main feed water pump. Background technique [0002] see figure 1 , 1000MW nuclear power conventional island main feed water pump mainly includes pump cylinder 100, water inlet pipe 200, water outlet pipe 300, side plate 400, rib plate several parts, these parts need to be welded, and these materials are not exactly the same. Among them, the pump barrel, water inlet pipe and outlet pipe are F6NM, the side plate is Q235, and the welding of the side plate and the pump barrel is made of different materials. Due to strict product manufacturing requirements, complex structure, short manufacturing cycle, and high cost of materials used in equipment, most parts such as the pump casing and pump cover on the pump cylinder are forgings, which are very difficult to weld. [0003] The following problems will be encountered when wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/235B23K9/173B23K9/095
CPCB23K9/0026B23K9/095B23K9/173B23K9/235
Inventor 庞建丽汤黎明吴天笑丁小武
Owner SHANGHAI KAIQUAN PUMP IND GROUP
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