Method for welding balancing air leakage pipe of medium-high pressure outer cylinder in turbine

A welding method and steam turbine technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of uneven welding seam width, reduced welding quality, rough welding lines, etc., to achieve no spatter, good penetration, Weld seam ripple effect

Inactive Publication Date: 2013-03-13
HARBIN TURBINE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems of many defects after welding, rough weld lines, different weld widths, and reduced welding quality caused by manual arc

Method used

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  • Method for welding balancing air leakage pipe of medium-high pressure outer cylinder in turbine

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Experimental program
Comparison scheme
Effect test

Example Embodiment

[0009] Specific implementation mode 1: In this embodiment, the welding method of the balance blow-by pipe of the high and medium pressure outer cylinder of the steam turbine is as follows:

[0010] Preheat the groove of the balance leak pipe of the middle and high pressure outer cylinder of the steam turbine to 150℃~180℃, the welding current is 110A~130A, the welding voltage is 12~18V, the nozzle diameter is 8~10mm, and the argon gas flow rate is Weld by argon arc welding under the condition of 6-15 liters / min. After welding, keep it at 300℃~400℃ for 2 hours, and then increase the temperature to 680±10℃ at a temperature rise rate of 10℃ / h~80℃ / h. And keep the temperature at 680±10℃ for 4 hours, and reduce the temperature to 150℃~200℃ at a cooling rate of 10℃ / h~80℃ / h, which completes the welding of the balance blow-by pipe of the middle and high pressure outer cylinder of the steam turbine.

Example Embodiment

[0011] Second embodiment: This embodiment is different from the first embodiment in that the groove of the balance blow-by pipe of the middle and high pressure outer cylinder of the steam turbine is preheated to 160°C. Others are the same as the first embodiment.

Example Embodiment

[0012] Specific embodiment three: This embodiment is different from specific embodiment one in that the groove of the balance blow-by pipe of the middle and high pressure outer cylinder of the steam turbine is preheated to 170°C. Others are the same as the first embodiment.

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Abstract

A method for welding a balancing air leakage pipe of a medium-high pressure outer cylinder in a turbine relates to a method for welding and is used for solving the technical problems of more welding defects, coarse welding lines, uneven welding line widths and lowered welding quality due to the adoption of a method for manually arc-welding the balancing air leakage pipe of the medium-high pressure outer cylinder in the turbine. The method is ad follows: a beveled edge of the balancing air leakage pipe of the medium-high pressure outer cylinder in the turbine is preheated, is welded through adopting argon arc welding, is thermally insulated for 2 hours at 300 DEG C to 400 DEG C after the welding, is heated, is thermally insulated and is cooled so as to complete the welding of the balancing air leakage pipe of the medium-high pressure outer cylinder in the turbine. After the method is adopted, the defects of weld beading, lack of penetration and pits which are easily generated through adopting shielded metal arc welding do not exist, and the first pass yield of postwelding radiographic inspection is above 90%; and moreover, after the method is adopted, the welding line formation is good, i.e. weld ripples are fine, the welding line widths are consistent with each other, no splashing is generated, and the postwelding appearance quality is good.

Description

Technical field [0001] The invention relates to a welding method. Background technique [0002] The welding process of the balance bleed pipe of the steam turbine high and medium pressure cylinder adopts manual electrode arc welding. Because the pipe wall is relatively thin (6mm~8mm) and there are many defects after welding, the radiographic flaw detection cannot be qualified, which affects the production progress, and the weld surface is not formed. Good, the welding pattern is rough, the width of the welding seam is different, and the welding quality is reduced. Summary of the invention [0003] The purpose of the present invention is to solve the technical problems of using manual arc welding of steam turbine high and medium pressure cylinders to balance the air leakage pipe, resulting in many defects after welding, rough welding lines, different widths of welds, and reduced welding quality, and provides a steam turbine Welding method of high and medium pressure outer cylinder...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235
Inventor 马春光潘春雷计贵峰
Owner HARBIN TURBINE
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