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Processing method of low-pressure moving blade and stellite alloy sheet welding defect elimination working procedure

A technology of stellite alloy sheet and processing method, which is applied in the field of steam turbine low-pressure moving blade processing, can solve the problems of low qualified rate of brazing for many times, and achieve the effects of enhanced qualified rate, cost saving and reduced damage

Inactive Publication Date: 2019-05-17
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem that the existing processing method of welding blade defect elimination process needs to carry out multiple times of brazing and the qualified rate is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0024] Specific embodiment one: the processing method of the low-pressure moving blade welding Stellite alloy sheet defect elimination process described in this embodiment, the method includes the following process:

[0025] Step 1. Lay the moving blades to be eliminated on the horizontal workbench;

[0026] Step 2. Use alcohol cotton to clean the inside and back arc of the weld between the moving blade to be eliminated and the Stellite alloy sheet;

[0027] Step 3, preheating the weld seam;

[0028] Step 4, making flux cover the preheated weld seam;

[0029] Step 5. Use the neutral flame of the welding torch to continue heating the weld covered by the flux. When the brazing material in the weld is slightly melted, use the welding wire dipped in flux to weld the weld to complete the low-pressure welding. The operation of the defect elimination process of welding Stellite alloy sheets for moving blades.

[0030] In this embodiment, the operation of the entire defect eliminat...

specific Embodiment approach 2

[0033] Specific embodiment two: the difference between this embodiment and the processing method of the low-pressure moving blade welding Stellite alloy sheet defect elimination process described in specific embodiment one is that in step three, the specific process of preheating the weld seam is:

[0034] Make the neutral flame of the welding torch swing left and right at a distance of 4mm to 6mm from the weld until it traverses the entire weld, so that the temperature of the weld is 95°C to 105°C; the swing distance is 95mm to 100mm, and the swing distance The time of inner swing is 4s to 6s.

specific Embodiment approach 3

[0035] Specific embodiment three: the difference between this embodiment and the processing method of the low-pressure moving blade welding Stellite alloy sheet elimination process described in specific embodiment two is that the vertical distance between the neutral flame of the welding torch and the weld seam is 5mm, the swing distance is 100mm, and the swing time within the swing distance is 5s.

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Abstract

The invention discloses a processing method of a low-pressure moving blade and stellite alloy sheet welding defect elimination working procedure, and belongs to the field of steam turbine low-pressuremoving blade processing. The problems that according to an existing processing method of a welding blade defect elimination working procedure, brazing needs to be conducted repeatedly, and the percent of pass is low are solved. The processing method comprises the following steps that the first step, a moving blade to be subjected to defect elimination is placed on a horizontal workbench in a flatwise mode; the second step, an inner arc and a back arc of a welded joint between the moving blade to be subjected to defect elimination and a stellite alloy sheet are cleaned up by alcohol pads; thethird step, the welded joint is preheated; the fourth step, the preheated welded joint can be covered with brazing flux; and the fifth step, neutral flames of a welding torch is utilized to continue to heat the welded joint which is covered with the brazing flux, when the brazing material in the welded joint is slightly molten, the welded joint is welded by a welding wire which is soaked with thebrazing flux, and therefore the operation of the low-pressure moving blade and stellite alloy sheet welding defect elimination working procedure is accomplished. The processing method is mainly used for processing the welded joint on the moving blade.

Description

technical field [0001] The invention belongs to the field of processing low-pressure moving blades of steam turbines. Background technique [0002] The general method of welding the Stellite alloy sheet for the low-pressure moving blade of the steam turbine is to perform multiple brazing. The pass rate of this method is low, only about 40%, and the cost after rework is high, which cannot meet the processing requirements. Therefore, the above problems need to be solved urgently. Contents of the invention [0003] The present invention is to solve the problem that the existing processing method of welding blade defect elimination process needs to carry out multiple times of brazing and the qualified rate is low. . [0004] A processing method for the process of welding Stellite alloy sheets to eliminate defects of low-pressure moving blades, the method includes the following processes: [0005] Step 1. Lay the moving blades to be eliminated on the horizontal workbench; ...

Claims

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Application Information

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IPC IPC(8): B23K1/14B23K1/20
Inventor 杜秋东李辉刘学斌田立李孟哲曹春华赵健
Owner HARBIN TURBINE
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