Unlock instant, AI-driven research and patent intelligence for your innovation.

Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine

A feed water heater and back-sealing welding technology, which is applied in arc welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of high repair rate, poor welding quality, and difficult one-time pass of radiographic flaw detection, etc., so as to improve welding quality and reduce The repair rate and the effect of shortening the manufacturing cycle

Active Publication Date: 2013-04-03
HARBIN TURBINE +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a third-generation nuclear power steam turbine low-pressure feedwater heater housing argon arc back-sealing welding method to solve the current problem of steam turbine low-pressure feedwater heater shell bottom-sealing welding, using wire-filled argon arc welding, gas shielded welding or Submerged arc welding filling process, poor welding quality, high repair rate, and the problem that it is difficult to pass the radiographic flaw detection at one time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine
  • Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0021] Specific implementation mode one: combine figure 1 and figure 2 Explain, the argon-arc back-sealing welding method for the low-pressure feedwater heater shell of the third-generation nuclear power steam turbine in this embodiment, the method is completed according to the following steps:

[0022] Step 1. Processing groove:

[0023] Process grooves at the butt end faces of the two workpieces 1 to be welded, the groove is in a U shape, and the bottom surface of the U-shaped groove 2 is provided with a protrusion 3; the two workpieces 1 to be welded are Two casings of the low-pressure feed water heater to be welded;

[0024] Step 2. Preparation before welding:

[0025] Check the wall thickness w and surface finish of the parts to be welded of the two workpieces 1 to be welded, so that the parts to be welded meet the welding requirements;

[0026] Step three, cleaning before welding:

[0027] Clean the surfaces of the two workpieces 1 to be welded, the workbench and e...

specific Embodiment approach 2

[0037] Specific implementation mode two: combination figure 1 and figure 2 Illustrate, in the step 2 of present embodiment, the wall thickness w of two workpieces 1 to be welded is 40mm; For the treatment of emulsifiable oil and dirt (which can be cleaned by mechanical or chemical methods), the surface of the workbench and each fixture is cleaned; in step 4, the maximum local gap is allowed not to exceed 1.0mm; in step 5, the welding current The welding temperature is 150V, the welding speed is 8cm / min, the welding torch swing distance is 15mm, and the welding torch swing angle is 15°; in step 6, the heat treatment temperature is 625°C, the heating rate is 80°C / h, and the temperature is lowered after holding for 3 hours. Others are the same as in the first embodiment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an argon arc back sealing welding method for a housing of a low-pressure water supply heater of a third-generation nuclear power steam turbine and relates to the back sealing welding method for the housing of the low-pressure water supply heater of the third-generation nuclear power steam turbine. The method is used for solving the problems of poor welding quality, higher back repair rate and single pass difficulty in radiographic inspection because a wire-filling argon arc welding process, a gas shield welding process or a submerged-arc welding filling process is adopted for the back sealing welding of the housing of the low-pressure water supply heater of the steam turbine at present. The method comprises the following steps: 1) processing bevels on the butt joint end surfaces of two workpieces to be welded, wherein each bevel is in the shape of U and a bulge is arranged on the bottom surface of each U-shaped bevel; 2) preparing before welding; 3) clearing before welding; 4) assembling; 5) performing butt welding on the U-shaped bevels of the two workpieces to be welded by adopting the self-fluxing argon arc welding way without a filler wire, wherein the welding current is 110-180V, the welding speed is 6-10cm / minute, the swing distance of a welding gun is 5-20mm and the swing angle of the welding gun is 5-20 degrees; 6) performing heat treatment after welding; and 7) performing non-destructive flaw detection. The argon arc back sealing welding method is used for the back sealing welding of the housing of the low-pressure water supply heater of the third-generation nuclear power steam turbine.

Description

technical field [0001] The invention relates to a bottom-sealing welding method for a third-generation nuclear power steam turbine low-pressure feed water heater shell. Background technique [0002] The steam turbine low-pressure feed water heater (one of the auxiliary equipment of the thermal power steam turbine) is one of the important auxiliary equipment of the heat recovery system of the power station. The heat energy is fully utilized and the thermal efficiency of the generating set is improved. The design temperature of the low-pressure heater of the third-generation nuclear power steam turbine is about 120°C, and the test pressure is about 6.05MPa. Therefore, the welding quality and safety factor of the low-pressure feedwater heater shell are extremely high, especially for the last ring of the low-pressure feedwater heater shell. Seam seal welding requires higher requirements. For nuclear power plants, if there is a problem, the small one will directly affect the saf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/235
Inventor 张仁军太秀滨张俊成陈佰军卢波
Owner HARBIN TURBINE