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Automatic welding method for hollow stationary blade of steam turbine

A technology of automatic welding and hollow stationary vane, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as insufficient welding penetration, low welding efficiency, and consistency deviation of hollow stationary vane, so as to improve quality stability, Improve welding efficiency and reduce welding deformation

Active Publication Date: 2013-06-12
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The hollow stator blade of the steam turbine is mainly connected and formed by welding two stamped inner and back arc thin plates. Since the inner and back arc thin plates tend to have large deviations in the process of stamping and groove milling, the hollow stator blades before welding There is a large deviation in the consistency of the state, such as the geometric size of the groove, the position to be welded, etc., which is not conducive to the identification and adjustment of the welding position by the automatic welding equipment, which will lead to insufficient welding penetration, unfused bottom of the groove, uneven weld seam, and even Welding defects such as welding voids
Therefore, the current welding forming technology of the hollow vane of steam turbines has been limited to the field of manual welding. Although manual welding has the advantages of flexible operation and wide adaptability, it is easily affected by individual emotional factors, posture, physical strength and individual welding techniques. Low production efficiency, high labor intensity and unstable welding quality
In addition, the manual welding of the hollow stationary vane in the past is the process of spot welding first, then manual full welding of the steam outlet side, and finally full welding of the steam inlet side. Welding process sequence, because surfacing welding is used on the steam outlet side, after each weld seam welding on the steam outlet side, the weld seam must be cooled before the next weld seam can be welded, and the welding efficiency is low; and the previous manual 5-7 weld seams are required for welding the steam outlet side, which has many weld seams, large heat input, and large welding deformation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Assemble and fix the inner and back arc thin plates of the hollow stator blades to the corresponding fixtures, and the robot arc welding equipment welds the first swing arc weld on the outlet side, in which the robot control program calls CMT (cold metal transition) welding mode, set the current to 120A, adopt a swing width of 15mm, and a welding speed of 9 mm / s;

[0016] Robotic arc welding equipment is used to weld the incoming steam side, in which the robot control program calls the CMT+Pulse (cold metal transition + pulse) mode, sets the current to 120A, and the welding speed to 7.5mm / s;

[0017] When the first swing arc weld on the steam outlet side cools down to below 250°C, implement the second welding on the steam outlet side on the basis of this weld seam. The robot control program calls the CMT welding mode and sets the current to 120A. The pendulum width is 12mm, and the welding speed is 6.5mm / s;

[0018] When the temperature of the second welding seam on th...

Embodiment 2

[0021] Assemble and fix the inner and back arc thin plates of the hollow stator blades to the corresponding fixtures, and the robot arc welding equipment welds the first swing arc weld on the outlet side, in which the robot control program calls CMT (cold metal transition) welding mode, set the current to 140A, adopt a swing width of 10mm, and a welding speed of 3mm / s;

[0022] Robotic arc welding equipment is used to weld the incoming steam side, in which the robot control program calls the CMT+Pulse (cold metal transition + pulse) mode, sets the current to 145A, and the welding speed to 3 mm / s;

[0023] When the first swing arc weld on the steam outlet side cools down to below 250°C, the second swing arc weld on the steam outlet side is carried out on the basis of this weld seam. The robot control program calls the CMT welding mode and sets the current 140A, with a swing width of 13.5mm and a welding speed of 3 mm / s;

[0024] When the temperature of the second welding seam ...

Embodiment 3

[0027] Assemble and fix the inner and back arc thin plates of the hollow stator blades to the corresponding fixtures, and the robot arc welding equipment welds the first swing arc weld on the outlet side, in which the robot control program calls CMT (cold metal transition) welding mode, set the current to 160A, adopt a swing width of 12.5mm, and a welding speed of 15 mm / s;

[0028] Robotic arc welding equipment is used to weld the incoming steam side, in which the robot control program calls the CMT+Pulse (cold metal transition + pulse) mode, sets the current to 170A, and the welding speed to 12 mm / s;

[0029] When the first swing arc weld on the steam outlet side cools down to below 250°C, the second swing arc weld on the steam outlet side is carried out on the basis of this weld seam. The robot control program calls the CMT welding mode and sets the current 160A, with a swing width of 15mm and a welding speed of 10 mm / s;

[0030] When the temperature of the second welding s...

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Abstract

The invention provides an automatic welding method for a hollow stationary blade of a steam turbine. By adopting the method, the problem that the conventional hollow stationary blade is not suitable for automatic welding can be solved, and the conventional method in which the hollow stationary blade only depends on manual welding is substituted, so that production efficiency is greatly increased,labor intensity of workers is reduced, welding deformation can be effectively reduced, and stability of welding quality is guaranteed. The method is characterized in that: a steam outlet edge and a steam inlet edge of the hollow stationary blade of the steam engine are welded through a swinging arc process by combining a welding robot with gas metal arc welding equipment. The method comprises thefollowing process steps of: (1) assembling inner and back arc thin plates of the hollow stationary blade on corresponding clamps and fixing; (2) welding a first swinging arc welding seam of the steamoutlet edge; (3) welding the steam inlet edge; (4) welding the rest swinging arc welding seams of the steam outlet edge in sequence; and (5) disassembling the blade off the clamps after each welding seam is slowly cooled to room temperature.

Description

technical field [0001] The invention relates to the technical field of automatic welding processing of hollow stationary vanes, in particular to an automatic welding method for hollow stationary vanes of steam turbines. Background technique [0002] The hollow stator blade of the steam turbine is mainly connected and formed by welding two stamped inner and back arc thin plates. Since the inner and back arc thin plates tend to have large deviations in the process of stamping and groove milling, the hollow stator blades before welding There is a large deviation in the consistency of the state, such as the geometric size of the groove, the position to be welded, etc., which is not conducive to the identification and adjustment of the welding position by the automatic welding equipment, which will lead to insufficient welding penetration, unfused bottom of the groove, uneven weld seam, and even Welding defects such as welding voids appear. Therefore, the current welding forming...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/022B23K9/173
Inventor 王烜烽苏化冰杨海东徐大懋
Owner WUXI TURBINE BLADE