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Steam turbine bulkhead electron-beam welding method

A technology of electron beam welding and steam turbine, which is applied in the direction of electron beam welding equipment, welding equipment, metal processing equipment, etc., and can solve the problems of low welding precision, shortened production cycle of separators, long production cycle, etc.

Active Publication Date: 2005-02-16
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of low welding precision and long production cycle in the common diaphragm welding method, the present invention provides an electron beam welding method for the diaphragm of a steam turbine, which not only greatly improves the welding accuracy, but also shortens the production cycle of the diaphragm , especially for separators with larger diameter and thickness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0006] Specific Embodiment 1: Referring to Fig. 1 and Fig. 2, this embodiment is realized in the following way: a. Carry out surface treatment to the partition blade to remove oil stains and impurities on the surface of the partition blade; b. According to the assembly technical requirements of the steam turbine partition Assemble and fix the partition blades on the tooling; c. Move the fixed partition blades to the electron beam welding vacuum chamber for isolation and vacuuming, wherein the vacuum degree of the electron gun is P=6.0~9.9×10 -5 mbar, vacuum degree of welding chamber P=4.0~9.0×10 -4 mbar; d. When the vacuum degree reaches the predetermined value, preheat the separator with electron beam current for 15-30 minutes, in which voltage U=55-60kV, electron beam current I=30-50mA, welding speed V=200- 500mm / min; e, then use vacuum electron beam welding machine (60KV, 60KW, vacuum chamber volume 230M 3 ) Carry out electron beam welding on the separator, where voltage U...

specific Embodiment approach 2

[0007] Specific implementation mode two: In this implementation mode, the electron gun vacuum degree P=6.0~8.0×10 -5 mbar, vacuum degree of welding chamber P=4.0~6.0×10 -4 mbar; preheating voltage U=55~58kV, electron beam current I=30~40mA, welding speed V=400~500mm / min; electron beam welding voltage U=50~55kV, electron beam current I=150~300mA, focusing Current J 1 =1~1.9A, gun distance f=200~280mm, welding speed V=400~500mm / min; post heat treatment electron beam current I=30~40mA. Other process conditions and process steps are the same as those in Embodiment 1.

specific Embodiment approach 3

[0008] Specific implementation mode three: In this implementation mode, the electron gun vacuum degree P=8.0~9.9×10 -5 mba, vacuum degree of welding chamber P=6.0~9.0×10 -4 mba; preheating voltage U=58~60kV, electron beam current I=40~50mA, welding speed V=500~600mm / min; electron beam welding voltage U=55~60kV, electron beam current I=300~400mA, focusing Current J 1 =1.9~3A, gun distance f=280~400mm, welding speed V=500~600mm / min; post heat treatment electron beam current I=40~50mA. Other process conditions and process steps are the same as those in Embodiment 1.

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PUM

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Abstract

The electron beam welding method of the steam turbine clapboard refers to a kind of welding technique. The invention is realized in the following way: a. clean the surface of the clapboard; b. assemble and fix the clapboard on the frock in accordance with the requirement of mounting technology of the electron beam's clapboard; c. move the fixed clapboard to the electronic welding vacuum chamber to vacuumize it; d. when the vacuum degree reaches predetermined value, heat the clapboard for between 15min and 30min with electron beam stream; e. weld the clapboard with the electron bombardment welding machine; f. after finishing the welding, heat the clapboard for over 30min with electron beam stream; g. after postheat treatment, isolate the clapboard in the vacuum chamber for between 15min and 30min; h. move the welded clapboard out of the vacuum chamber and put it into the temper furnace for heat treatment. The invention is featured by short production cycle, high welding precision, simple technique and low cost.

Description

Technical field: [0001] The invention relates to a welding process, in particular to a welding process for steam turbine clapboards. Background technique: [0002] The steam turbine diaphragm generally adopts a welded structure. The function of welding is to connect the blades that make up the diaphragm into a whole, so as to achieve the purpose of eliminating vibration and reducing steam leakage. The manufacturing accuracy of the diaphragm has a great influence on the working efficiency of the steam turbine, and requires high welding performance and manufacturing accuracy. Due to the large number of diaphragms and the complicated manufacturing process of steam turbines, diaphragm welding has always been a key process in steam turbine manufacturing, which directly affects the product quality and production cycle of steam turbines. At present, in the steam turbine industry, the commonly used welding methods for steam turbine diaphragms are: manual arc welding, submerged arc ...

Claims

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Application Information

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IPC IPC(8): B23K15/00
Inventor 李全华崔满
Owner HARBIN TURBINE
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